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bq24298
SLUSC59A – APRIL 2015 – REVISED DECEMBER 2016
bq24298 I2C Controlled 3A Single Cell USB Charger With Narrow VDC
Power Path Management and Adjustable Voltage USB OTG
1
1 Features
•
•
•
•
•
•
•
•
•
•
90% High Efficiency Switch Mode 3-A Charger
3.9-V to 6.2-V Single Input USB-Compliant
Charger with 6.4-V Over-Voltage Protection
– Input voltage and current limit supports USB
2.0 and USB 3.0
– Input Current Limit: 100 mA, 150 mA, 500 mA,
900 mA, 1 A, 1.5 A, 2 A, and 3 A
USB OTG with Adjustable output 4.55 V to 5.5 V
at 1 A or 1.5 A
– Fast OTG Startup (22 ms Typ)
– 90% 5-V Boost Mode Efficiency
– Accurate ±15% Hiccup Mode Overcurrent
Protection
Narrow VDC (NVDC) Power Path Management
– Instant System On with No Battery or Deeply
Discharged Battery
– Ideal Diode Operation in Battery Supplement
Mode
1.5-MHz Switching Frequency for Low Profile 1.2mm Inductor
I2C port for optimal system performance and
status reporting
Autonomous Battery Charging with or without
Host Management
– Battery Charge Enable
– Battery Charge Preconditioning
– Charge Termination and Recharge
High Accuracy
– ±0.5% Charge Voltage Regulation
– ±7% Charge Current Regulation
– ±7.5% Input Current Regulation
– ±3% Output Voltage Regulation in USB OTG
Boost Mode
High Integration
– Power Path Management
– Synchronous Switching MOSFETs
– Integrated Current Sensing
– Bootstrap Diode
– Internal Loop Compensation
Safety
– Battery Temperature Sensing for Charging and
Discharging in OTG Mode
– Battery Charging Safety Timer
•
•
•
•
•
– Thermal Regulation and Thermal Shutdown
– Input and System Over-Voltage Protection
– MOSFET Over-Current Protection
Charge Status Outputs for LED or Host Processor
Maximum power tracking capability by input
voltage regulation
20-µA Low Battery Leakage Current and Support
Shipping Mode and System Reset
I2C Forced BATFET Off with Delay (9 s Typ)
4.00-mm x 4.00-mm WQFN-24 Package
2 Applications
•
•
Tablet PC, Smart Phone, Internet Devices
Portable Audio Speaker
3 Description
The bq24298 is a highly-integrated switch-mode
battery charge management and system power path
management device for 1 cell Li-Ion and Li-polymer
battery in a wide range of smart phone and tablet
applications. Its low impedance power path optimizes
switch-mode operation efficiency, reduces battery
charging time and extends battery life during
discharging phase.
Device Information(1)
PART NUMBER
PACKAGE
bq24298
BODY SIZE (NOM)
WQFN (24)
4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
PSEL from PHY, Charging from SDP/DCP, and
Optional BATFET Enable Interface
bq24298
5V USB
SDP/DCP
VBUS
PMID
1μF
1μH
4.7μF
ILIM
SYS
PGND
2.2kW
PG
STAT
VREF
Host
PHY
10μF
BOOT
REGN
317W (1.5A max)
10kW
10μF
47nF
8.2μF
10kW
SYS: 3.5V-4.35V
SW
SYS
BAT
10μF
10kW
SDA
SCL
INT
OTG
CE
4.2V
QON
PSEL
Thermal Pad
REGN
5.25kW
TS
31.23kW
10kW
Charge Enable (0°C - 45°C)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
bq24298
SLUSC59A – APRIL 2015 – REVISED DECEMBER 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Description (Continued) ........................................
Pin Configuration and Functions .........................
Specifications.........................................................
7.1
7.2
7.3
7.4
7.5
7.6
7.7
8
1
1
1
2
3
4
5
Absolute Maximum Ratings ...................................... 5
ESD Ratings ............................................................ 5
Recommended Operating Conditions....................... 6
Thermal Information .................................................. 6
Electrical Characteristics........................................... 6
Timing Requirements .............................................. 10
Typical Characteristics ............................................ 10
Detailed Description ............................................ 13
8.1 Overview ................................................................. 13
8.2 Functional Block Diagram ....................................... 14
8.3 Feature Description................................................. 15
8.4 Device Functional Modes........................................ 25
8.5 Programming........................................................... 27
8.6 Register Map........................................................... 30
9
Application and Implementation ........................ 37
9.1 Application Information............................................ 37
9.2 Typical Application .................................................. 37
10 Power Supply Recommendations ..................... 41
11 Layout................................................................... 41
11.1 Layout Guidelines ................................................. 41
11.2 Layout Example .................................................... 42
12 Device and Documentation Support ................. 43
12.1
12.2
12.3
12.4
12.5
12.6
Documentation Support .......................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
43
43
43
43
43
43
13 Mechanical, Packaging, and Orderable
Information ........................................................... 43
4 Revision History
Changes from Original (April 2015) to Revision A
Page
•
Changed VREF to VREGN in Figure 16 ................................................................................................................................. 21
•
Changed 20°C to –20°C and VREF to VREGN in Figure 17 ................................................................................................. 22
•
Changed Equation 1 ............................................................................................................................................................ 22
•
Added information to Table 6 .............................................................................................................................................. 30
•
Changed Bit 3 RESET from 1 to 0 in Table 10 ................................................................................................................... 33
•
Changed Bit 2 RESET from 1 to 0 in Table 10 ................................................................................................................... 33
•
Changed 0 to 1 for REG05 Bit 2 Reset in Table 11 ............................................................................................................ 33
•
Changed 1 to 0 for REG05 Bit 1 Reset in Table 11 ............................................................................................................ 33
•
Added note to Figure 38 ...................................................................................................................................................... 37
•
Changed last paragraph in Output Capacitor section .......................................................................................................... 38
2
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SLUSC59A – APRIL 2015 – REVISED DECEMBER 2016
5 Description (Continued)
The I2C serial interface with charging and system settings makes the device a truly flexible solution.
The device supports 3.9V – 6.2V USB input sources, including standard USB host port and USB charging port
with 6.4V over-voltage protection. The device supports USB 2.0 and USB 3.0 power specifications with input
current and voltage regulation. To set the default input current limit, the bq24298 takes the result from the
detection circuit in the system, such as USB PHY device. The device also supports USB On-the-Go operation by
providing fast startup and supplying adjustable voltage 4.55 – 5.5V (default 5V) on the VBUS with an accurate
current limit up to 1.5A.
The power path management regulates the system slightly above battery voltage but does not drop below 3.5V
minimum system voltage (programmable). With this feature, the system keeps operating even when the battery
is completely depleted or removed. When the input source current or voltage limit is reached, the power path
management automatically reduces the charge current to zero and then starts discharges the battery until the
system power requirement is met. This supplement mode operation keeps the input source from getting
overloaded.
The device initiates and completes a charging cycle when host control is not available. It automatically charges
the battery in three phases: pre-conditioning, constant current and constant voltage. In the end, the charger
automatically terminates when the charge current is below a preset limit in the constant voltage phase. Later on,
when the battery voltage falls below the recharge threshold, the charger will automatically start another charging
cycle.
The charge device provides various safety features for battery charging and system operation, including negative
thermistor monitoring, charging safety timer and over-voltage/over-current protections. The thermal regulation
reduces charge current when the junction temperature exceeds 120°C (programmable).
The STAT output reports the charging status and any fault conditions. The INT immediately notifies host when
fault occurs.
The bq24298 is available in a 24-pin, 4.00-mm x 4.00-mm thin WQFN package.
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SLUSC59A – APRIL 2015 – REVISED DECEMBER 2016
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6 Pin Configuration and Functions
VBUS
PMID
REGN
BTST
SW
SW
24-Pin WQFN
RTW Package
(Top View)
24
23
22
21
20
19
VBUS
1
18
PGND
PSEL
2
17
PGND
16
SYS
PG
3
bq24298
5
14
BAT
SDA
6
13
BAT
8
9
10
11
12
QON
7
TS
SCL
ILIM
SYS
CE
15
OTG
4
INT
STAT
Pin Functions
PIN
TYPE
DESCRIPTION
P
Charger Input Voltage. The internal n-channel reverse block MOSFET (RBFET) is connected between VBUS and
PMID with VBUS on source. Place a 1-µF ceramic capacitor from VBUS to PGND and place it as close as possible
to IC.
2
I
Power source selection input. High indicates a USB host source and Low indicates an adapter source.
3
O
Open drain active low power good indicator. Connect to the pull up rail via 10-kΩ resistor. LOW indicates a good
input source if the input voltage is between UVLO and ACOV, above SLEEP mode threshold, and current limit is
above 30 mA.
STAT
4
O
Open drain charge status output to indicate various charger operation. Connect to the pull up rail via 10-kΩ resistor.
LOW indicates charge in progress. HIGH indicates charge complete or charge disabled. When any fault condition
occurs, STAT pin in the charge blinks at 1 Hz.
NAME
NUMBER
VBUS
1,24
PSEL
PG
SCL
5
I
I2C Interface clock. Connect SCL to the logic rail through a 10-kΩ resistor.
SDA
6
I/O
I2C Interface data. Connect SDA to the logic rail through a 10-kΩ resistor.
INT
7
O
Open-drain Interrupt Output. Connect the INT to a logic rail via 10kΩ resistor. The INT pin sends active low, 256-µs
pulse to host to report charger device status and fault.
OTG
8
I
Digital
USB current limit selection pin during buck mode, and active high enable pin during boost mode.
For bq24298, when in buck mode with USB host (PSEL = High), when OTG = High, IIN limit = 500 mA and when
OTG = Low, IIN limit = 100 mA.
The boost mode is activated when the REG01[5] = 1 and OTG pin is High.
4
CE
9
I
Active low Charge Enable pin. Battery charging is enabled when REG01[5:4] = 01 and CE pin = Low. CE pin must
be pulled high or low.
ILIM
10
I
ILIM pin sets the maximum input current limit by regulating the ILIM voltage at 1 V. A resistor is connected from
ILIM pin to ground to set the maximum limit as IINMAX = (1V/RILIM) × KILIM. The actual input current limit is the lower
one set by ILIM and by I2C REG00[2:0]. The minimum input current programmed on ILIM pin is 500 mA.
TS
11
I
Analog
Temperature qualification voltage input. Connect a negative temperature coefficient thermistor. Program
temperature window with a resistor divider from REGN to TS to GND. Charge suspends or Boost disable when TS
pin is out of range. A 103AT-2 thermistor is recommended.
QON
12
I
BATFET enables control in shipping mode and BATFET reset function. Logic high to low transition on this pin with
at least tQON_ON_1 deglitch turns on BATFET to exit shipping mode. It has internal pull up to maintain default high
logic.
When VBUS is not plugged-in, a logic low of at least tQON_RST will reset SYS power by turning BATFET off for
tBATFET_RST and then re-enable BATFET after tBATFET_RST duration. The pin integrates a pull-up resistor of typical 187
kΩ.
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SLUSC59A – APRIL 2015 – REVISED DECEMBER 2016
Pin Functions (continued)
PIN
TYPE
DESCRIPTION
NAME
NUMBER
BAT
13,14
P
Battery connection point to the positive pin of the battery pack. The internal BATFET is connected between BAT
and SYS. Connect a 10 µF closely to the BAT pin.
SYS
15,16
I
System connection point. The internal BATFET is connected between BAT and SYS. When the battery falls below
the minimum system voltage, switch-mode converter keeps SYS above the minimum system voltage. The SYS pin
has a built-in load to ground which may discharge 330-µF load to less than 0.3 V within 250 ms typically.
PGND
17,18
P
Power ground connection for high-current power converter node. Internally, PGND is connected to the source of the
n-channel LSFET. On PCB layout, connect directly to ground connection of input and output capacitors of the
charger. A single point connection is recommended between power PGND and the analog GND near the IC PGND
pin.
SW
19,20
O
Switching node connecting to output inductor. Internally SW is connected to the source of the n-channel HSFET and
the drain of the n-channel LSFET. Connect the 0.047-µF bootstrap capacitor from SW to BTST.
BTST
21
P
PWM high side driver positive supply. Internally, the BTST is connected to the anode of the boost-strap diode.
Connect the 0.047-µF bootstrap capacitor from SW to BTST.
REGN
22
P
PWM low side driver positive supply output. Internally, REGN is connected to the cathode of the boost-strap diode.
Connect a 4.7-µF (10-V rating) ceramic capacitor from REGN to analog GND. The capacitor should be placed close
to the IC. REGN also serves as bias rail of TS pin.
P
Exposed pad beneath the IC for heat dissipation. Always solder thermal pad to the board, and have vias on the
thermal pad plane star-connecting to PGND and ground plane for high-current power converter.
Thermal Pad
7 Specifications
7.1 Absolute Maximum Ratings (1)
MIN
MAX
UNIT
VBUS (converter not switching)
–2
15 (2)
V
PMID (converter not switching)
–0.3
15 (2)
V
STAT, PG
–0.3
12
V
BTST
–0.3
12
V
–2
7
8 (Peak
for 20ns
duration)
V
BAT, SYS (converter not switching)
–0.3
6
V
SDA, SCL, INT, OTG, ILIM, REGN, TS, QON, CE PSEL
–0.3
7
V
BTST TO SW
–0.3
7
V
PGND to GND
–0.3
0.3
V
6
mA
Junction temperature
–40
150
°C
Storage temperature range, Tstg
–65
150
°C
SW
Voltage
(with respect to GND)
Output sink current
(1)
(2)
INT, STAT, PG
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage
values are with respect to the network ground pin unless otherwise noted.
VBUS is specified up to 16 V for a maximum of 24 hours under no load conditions.
7.2 ESD Ratings
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001
V(ESD)
(1)
(2)
Electrostatic discharge
(1)
VALUE
UNIT
1000
V
250
V
Charged device model (CDM), per JEDEC specification JESD22C101 (2)
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
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7.3 Recommended Operating Conditions
MIN
MAX
UNIT
3.9
6.2 (1)
V
Output current (SYS)
3.5
A
Battery voltage
4.4
V
3
A
VIN
Input voltage
ISYS
VBAT
Fast charging current
IBAT
Discharging current with internal MOSFET
TA
(1)
Operating free-air temperature range
–40
5.5
A
85
°C
The inherent switching noise voltage spikes should not exceed the absolute maximum rating on either the BTST or SW pins. A tight
layout minimizes switching noise.
7.4 Thermal Information
bq24298
THERMAL METRIC (1)
RTW (WQFN)
UNIT
24 PIN
RθJA
Junction-to-ambient thermal resistance
32.2
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
29.8
°C/W
RθJB
Junction-to-board thermal resistance
9.1
°C/W
ψJT
Junction-to-top characterization parameter
0.3
°C/W
ψJB
Junction-to-board characterization parameter
9.1
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
2.2
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Electrical Characteristics
VVBUS_UVLOZ < VVBUS < VACOV and VVBUS > VBAT + VSLEEP, TJ = –40°C to 125°C and TJ = 25°C for typical values (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
QUIESCENT CURRENTS
IBAT
Battery discharge current (BAT, SW, SYS)
IVBUS
Input supply current (VBUS)
IBOOST
Battery discharge current in boost mode
VVBUS < VUVLO, VBAT = 4.2 V, leakage between BAT and
VBUS, TJ < 85°C
5
High-Z Mode, or no VBUS, BATFET disabled (REG07[5] =
1), –40°C – 85°C
16
20
µA
High-Z Mode, or no VBUS, BATFET enabled (REG07[5] =
0), –40°C – 85°C
32
55
µA
VVBUS = 5 V, High-Z mode, No battery
15
30
µA
VVBUS > VUVLO, VVBUS > VBAT, converter not switching
1.5
3
mA
µA
VVBUS > VUVLO, VVBUS > VBAT, converter switching, VBAT =
3.2 V, ISYS = 0 A
4
mA
VVBUS > VUVLO, VVBUS > VBAT, converter switching, charge
disable, VBAT = 3.8 V, ISYS = 100 µA
3.5
mA
VBAT = 4.2 V, Boost mode, IVBUS = 0 A, converter
switching
3.5
mA
VBUS/BAT POWER UP
VVBUS_OP
VBUS operating voltage
2
3.9
6.2
VBUS for active I C, no battery
VVBUS rising
VSLEEP
Sleep mode falling threshold
VVBUS falling, VVBUS-VBAT
35
80
120
mV
VSLEEPZ
Sleep mode rising threshold
VVBUS rising, VVBUS-VBAT
170
250
350
mV
VACOV
VBUS over-voltage rising threshold
VVBUS rising
6.2
VACOV_HYST
VBUS over-voltage falling hysteresis
VVBUS falling
VBAT_UVLOZ
Battery for active I2C, no VBUS
VBAT rising
VBAT_DPL
Battery depletion threshold
VBAT falling
2.4
VBAT_DPL_HY
Battery depletion rising hysteresis
VBAT rising
200
mV
VVBUSMIN
Bad adapter detection threshold
VVBUS falling
3.8
V
6
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3.6
V
VVBUS_UVLOZ
V
6.6
250
V
mV
2.3
V
2.6
V
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Electrical Characteristics (continued)
VVBUS_UVLOZ < VVBUS < VACOV and VVBUS > VBAT + VSLEEP, TJ = –40°C to 125°C and TJ = 25°C for typical values (unless
otherwise noted)
PARAMETER
IBADSRC
TEST CONDITIONS
MIN
Bad adapter detection current source
TYP
MAX
30
UNIT
mA
POWER PATH MANAGEMENT
VSYS_MAX
Maximum DC system voltage output
BATFET (Q4) off, VBAT up to 4.35 V
VSYS_MIN
Minimum DC system voltage output
REG01[3:1] = 101, VSYSMIN = 3.5 V
RON(RBFET)
Top reverse blocking MOSFET onresistance between VBUS and PMIID
RON(HSFET)
Internal top switching MOSFET onresistance between PMID and SW
RON(LSFET)
Internal bottom switching MOSFET onresistance between SW and PGND
VFWD
BATFET forward voltage in supplement
mode
VSYS_BAT
SYS/BAT comparator
VBATGD
VBATGD_HYST
4.43
3.5
3.65
V
V
28
41
mΩ
TJ = –40°C – 85°C
39
51
TJ = -40°C – 125°C
39
58
TJ = –40°C – 85°C
61
82
TJ = -40°C – 125°C
61
90
BAT discharge current 10mA
30
mV
VBAT < VSYSMIN , VSYS falling
80
mV
VBAT > VSYSMIN , VSYS falling
180
mV
Battery good comparator rising threshold
VBAT rising
3.55
V
Battery good comparator falling threshold
VBAT falling
100
mV
mΩ
mΩ
BATTERY CHARGER
VBAT_REG_ACC
IICHG_REG_ACC
Charge voltage regulation accuracy
Fast charge current regulation accuracy
VBAT = 4.112 V and 4.208 V
–0.5%
0.5%
VBAT = 3.8 V, ICHG = 1024 mA, TJ = 25°C
-4%
4%
VBAT = 3.8 V, ICHG = 1024 mA, TJ = -20°C – 125°C
-7%
7%
VBAT = 3.8 V, ICHG = 1792 mA, TJ = -20°C – 125°C
–10%
10%
175
mA
ICHG_20pct
Charge current with 20% option on
VBAT = 3.1 V, ICHG = 104 mA, REG02 = 03 and REG02[0]
=1
75
VBATLOWV
Battery LOWV falling threshold
Fast charge to precharge, REG04[1] = 1
2.6
2.8
2.9
V
VBATLOWV_HYST
Battery LOWV rising threshold
Precharge to fast charge, REG04[1] = 1
(Typical 200-mV hysteresis)
2.8
3.0
3.1
V
IPRECHG_ACC
Precharge current regulation accuracy
VBAT = 2.6 V, ICHG = 256 mA
ITYP_TERM_ACC
Typical termination current
ITERM = 256 mA, ICHG = 2048 mA
ITERM_ACC
Termination current accuracy
ITERM = 256 mA, ICHG = 2048 mA
VSHORT
Battery short voltage
VBAT falling
2.0
V
VSHORT_HYST
Battery Short Voltage hysteresis
VBAT rising
200
mV
ISHORT
Battery short current
VBAT < 2.2 V
100
mA
VRECHG
Recharge threshold below VBAT_REG
VBAT falling, REG04[0] = 0
100
mV
tRECHG
Recharge deglitch time
VBAT falling, REG04[0] = 0
20
TJ = 25°C
24
28
TJ = –20°C – 125°C
24
35
RON_BATFET
SYS-BAT MOSFET on-resistance
–20%
20%
256
–20%
mA
20%
ms
mΩ
INPUT VOLTAGE/CURRENT REGULATION
VINDPM_REG_ACC
IUSB_DPM
Input voltage regulation accuracy
USB Input current regulation limit, VBUS =
5V, current pulled from SW
-2%
2%
USB100
85
100
mA
USB150
125
150
mA
USB500
440
500
mA
USB900
750
900
mA
1.3
1.5
IADPT_DPM
Input current regulation accuracy
IADP = 1.5 A, REG00[2:0] = 101
IIN_START
Input current limit during system start up
VSYS < 2.2 V
KILIM
IIN = KILIM/RILIM
100
395
435
A
mA
475 A x Ω
BAT OVER-VOLTAGE PROTECTION
VBATOVP
Battery over-voltage threshold
VBAT rising, as percentage of VBAT_REG
104%
VBATOVP_HYST
Battery over-voltage hysteresis
VBAT falling, as percentage of VBAT_REG
2%
tBATOVP
Battery over-voltage deglitch time to
disable charge
1
µs
THERMAL REGULATION AND THERMAL SHUTDOWN
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Electrical Characteristics (continued)
VVBUS_UVLOZ < VVBUS < VACOV and VVBUS > VBAT + VSLEEP, TJ = –40°C to 125°C and TJ = 25°C for typical values (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
TJunction_REG
Junction temperature regulation accuracy
REG06[1:0] = 11
120
°C
TSHUT
Thermal shutdown rising temperature
Temperature increasing
160
°C
TSHUT_HYS
Thermal shutdown hysteresis
30
°C
Thermal shutdown rising deglitch
Temperature increasing delay
1
ms
Thermal shutdown falling deglitch
Temperature decreasing delay
1
ms
COLD/HOT THERMISTER COMPARATOR
VLTF
Cold temperature threshold, TS pin
voltage rising threshold
Charger suspends charge. as percentage to VREGN
VLTF_HYS
Cold temperature hysteresis, TS pin
voltage falling
As percentage to VREGN
VHTF
Hot temperature TS pin voltage rising
threshold
As percentage to VREGN
46.6%
47.2%
48.8%
VTCO
Cut-off temperature TS pin voltage falling
threshold
As percentage to VREGN
44.2%
44.7%
45.2%
Deglitch time for temperature out of range
detection
VTS > VLTF, or VTS < VTCO, or VTS < VHTF
Cold temperature threshold, TS pin
voltage rising threshold
As percentage to VREGN REG02[1] = 0
(Approx. -10°C w/ 103AT)
VBCOLD0
Cold temperature threshold 1, TS pin
voltage rising threshold
VBHOT0
Hot temperature threshold, TS pin voltage
falling threshold
VBHOT1
Hot temperature threshold 1, TS pin
voltage falling threshold
Hot temperature threshold 2, TS pin
voltage falling threshold
As percentage to VREGN REG02[1] = 1
(Approx. -20°C w/ 103AT)
78.5%
76.5%
79%
79.5%
1%
As percentage to VREGN REG06[3:2] = 01
(Approx. 55°C w/ 103AT)
35.5%
As percentage to VREGN REG06[3:2] = 00
(Approx. 60°C w/ 103AT)
As percentage to VREGN REG06[3:2] = 10
(Approx. 65°C w/ 103AT)
36%
36.5%
3%
32.5%
33%
33.5%
3%
29.5%
As percentage to VREGN REG06[3:2] = 10
(Approx. 3°C w/ 103AT)
VBHOT2_HYS
76%
ms
1%
As percentage to VREGN REG06[3:2] = 00
(Approx. 3°C w/ 103AT)
VBHOT1_HYS
VBHOT2
75.5%
As percentage to VREGN REG06[3:2] = 01
(Approx. 3°C w/ 103AT)
VBHOT0_HYS
74%
10
As percentage to VREGN REG02[1] = 1
(Approx. 1°C w/ 103AT)
VBCOLD1_HYS
73.5%
0.4%
As percentage to VREGN REG02[1] = 0
(Approx. 1°C w/ 103AT)
VBCOLD0_HYS
VBCOLD1
73%
30%
30.5%
3%
CHARGE OVER-CURRENT COMPARATOR
IHSFET_OCP
HSFET cycle by cycle over-current
threshold
VLSFET_UCP
LSFET charge under-current falling
threshold
FSW
PWM Switching frequency, and digital
clock
DMAX
Maximum PWM duty cycle
VBTST_REFRESH
Bootstrap refresh comparator threshold
5.3
From sync mode to non-sync mode
1300
7.5
A
100
mA
1500
1700
kHz
97%
VBTST-VSW when LSFET refresh pulse is requested,
VBUS = 5 V
3.6
V
BOOST MODE OPERATION
VOTG_REG_ACC
OTG output voltage
I(VBUS) = 0, REG06[7:4] = 0111 (4.998 V)
VOTG_REG_ACC
OTG output voltage accuracy
I(VBUS) = 0, REG06[7:4] = 0111 (4.998 V)
VOTG_BAT
Battery voltage exiting OTG mode
BAT falling, REG04[1] = 1
V
3%
2.9
V
REG01[0] = 0
1
A
REG01[0] = 1
1.5
A
5.8
IOTG
OTG mode output current
VOTG_OVP
OTG over-voltage threshold
Rising threshold
VOTG_OVP_HYS
OTG over-voltage threshold hysteresis
Falling threshold
IOTG_LSOCP
LSFET cycle by cycle current limit
8
5
-3%
5
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300
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Electrical Characteristics (continued)
VVBUS_UVLOZ < VVBUS < VACOV and VVBUS > VBAT + VSLEEP, TJ = –40°C to 125°C and TJ = 25°C for typical values (unless
otherwise noted)
PARAMETER
IOTG_HSZCP
IRBFET_OCP
TEST CONDITIONS
MIN
HSFET under current falling threshold
RBFET over-current threshold
TYP
MAX
100
UNIT
mA
REG01[0] = 0
1.00
1.15
1.30
REG01[0] = 1
1.50
1.70
1.90
5.5
A
REGN LDO
VREGN
REGN LDO output voltage
IREGN
REGN LDO current limit
VVBUS = 6 V, IREGN = 40 mA
4.8
5
VVBUS = 5 V, IREGN = 20 mA
4.7
4.8
VVBUS = 5 V, VREGN = 3.8 V
50
V
V
mA
LOGIC I/O PIN CHARACTERISTICS (OTG, CE, STAT, QON, PSEL, PG)
VILO
Input low threshold
VIH
Input high threshold (CE, STAT, QON,
PSEL, PG)
0.4
VIH_OTG
Input high threshold (OTG)
VOUT_LO
Output low saturation voltage
Sink current = 5 mA
IBIAS
High level leakage current (OTG, CE,
STAT , PSEL, PG)
IBIAS
High level leakage current (QON)
1.3
V
V
1.1
V
0.4
V
Pull-up rail 1.8 V
1
µA
Pull-up rail 3.6 V
8
µA
I2C INTERFACE (SDA, SCL, INT)
VIH
Input high threshold level
VPULL-UP = 1.8 V, SDA and SCL
VIL
Input low threshold level
VPULL-UP = 1.8 V, SDA and SCL
1.3
0.4
V
VOL
Output low threshold level
Sink current = 5 mA
0.4
V
IBIAS
High-level leakage current
VPULL-UP = 1.8 V, SDA and SCL
1
µA
fSCL
SCL clock frequency
400
kHz
V
DIGITAL CLOCK AND WATCHDOG TIMER
fHIZ
Digital crude clock
REGN LDO disabled
15
35
50
kHz
fDIG
Digital clock
REGN LDO enabled
1300
1500
1700
kHz
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7.6 Timing Requirements
MIN
TYP
MAX
UNIT
VBUS/BAT POWER UP
tBADSRC
Bad source detection duration
30
ms
BOOST MODE OPERATION
tOTG_OCP_OFF
OTG mode over-current protection off cycle time
32
ms
tOTG_OCP_ON
OTG mode over-current protection on cycle time
450
µs
QON TIMING
tQON_ON_1
QON low time to turn on BATFET and exit ship mode
0.6
tQON_RST
QON low time to reset BATFET
10
tBATFET_RST
BATFET reset duration
1.5
12.5
250
s
15
s
400
ms
11
s
LOGIC I/O PIN CHARACTERISTICS (OTG, CE, STAT, QON, PSEL, PG)
tBATFET_DLY
BATFET disable delay time
7
9
REGN LDO disabled
138
172
REGN LDO enabled
138
168
DIGITAL CLOCK AND WATCHDOG TIMER
tWDT
REG05[5:4] = 11
s
Figure 1. I2C-Compatible Interface Timing Diagram
7.7 Typical Characteristics
Table 1. Table of Figures
FIGURE
Charging Efficiency vs Charging Current (DCR = 10 mΩ)
Figure 2
System Efficiency vs System Load Current (DCR = 10 mΩ)
Figure 3
Boost Mode Efficiency vs VBUS Load Current (DCR = 10 mΩ)
Figure 4
SYS Voltage Regulation vs System Load Current
Figure 5
Boost Mode VBUS Voltage Regulation (Typical Output = 4.998 V, REG06[7:4] = 0111) vs VBUS Load Current
Figure 6
SYS Voltage vs Temperature
Figure 7
BAT Voltage vs Temperature
Figure 8
Input Current Limit vs Temperature
Figure 9
Charge Current vs Package Temperature
Figure 10
10
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95
95
90
85
Efficiency (%)
Efficiency (%)
90
80
75
85
80
75
70
VBUS = 5V
VBUS = 5V
65
70
0
0.5
1
1.5
2
2.5
3
3.5
0
0.5
1
Charge Current (A)
100
4
95
3.9
90
3.8
85
80
75
60
0
0.5
3
1
3.7
3.6
SYSMIN = 3.5
SYSMIN = 3.2
SYSMIN = 3.7
3.5
3.3
3.2
1.5
0
0.5
1
VBUS Load Current (A)
1.5
2
2.5
3
3.5
System Load Current (A)
Figure 4. Boost Mode Efficiency
vs VBUS Load Current
Figure 5. SYS Voltage Regulation
vs System Load Current
3.7
5.1
5
3.65
SYS Voltage (V)
BOOST Mode Output Voltage (V)
2.5
3.4
VBAT = 3.2V
VBAT = 3.5V
VBAT = 3.8V
65
2
Figure 3. System Efficiency
vs System Load Current
SYS Voltage (V)
Efficiency (%)
Figure 2. Charge Efficiency vs Charge Current
70
1.5
Load Current (A)
4.9
4.8
4.7
3.55
VBAT = 3.2V
VBAT = 3.5V
VBAT = 3.8V
4.6
4.5
0
0.5
1
3.6
SYSMIN = 3.5V
3.5
1.5
-50
-25
0
25
50
75
100
125
150
Temperature (oC)
VBUS Load Current (A)
Typical Output = 4.998 V, REG06[7:4] = 0111
Figure 6. Boost Mode VBUS Voltage Regulation
vs VBUS Load Current
Figure 7. SYS Voltage vs Temperature
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4.4
2.5
Input Current Limit (A)
BAT Voltage (V)
4.35
4.3
4.25
4.2
1.5
IIN = 500mA
IIN = 1.5A
IIN = 2A
1
0.5
VREG = 4.208V
4.15
2
VREG = 4.35V
4.1
0
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
Temperature (oC)
50
75
100
125
150
Temperature (oC)
Figure 8. BAT Voltage vs Temperature
2.5
Figure 9. Input Current Limit vs Temperature
TREG = 120C
TREG = 80C
Charge Current (A)
2
1.5
1
0.5
0
60
80
100
120
140
160
Package Temperature (oC)
Figure 10. Charge Current vs Package Temperature
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8 Detailed Description
8.1 Overview
The bq24298 is an I2C controlled power path management device and a single cell Li-Ion battery charger. It
integrates the input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side
switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. The device also
integrates the bootstrap diode for the high-side gate drive.
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8.2 Functional Block Diagram
VBUS
PMID
RBFET (Q1)
VVBUS_UVLOZ
UVLO
Q1 Gate
Control
VBATZ+VSLEEP
SLEEP
REGN
REGN
LDO
EN_HIZ
ACOV
VACOV
BTST
FBO
VBUS
VOTG_OVP
VBUS_OVP_BOOST
VINDPM
I(Q2)
IOTG_HSZCP
Q2_UCP_BOOST
Q3_OCP_BOOST
IINDPM
I(Q3)
IOTG_LSOCP
SW
BAT
IC TJ
CONVERTER
CONTROL
BATOVP
HSFET (Q2)
REGN
104%xVBAT_REG
BAT
TREG
VBAT_REG
LSFET (Q3)
ILSFET_UCP
UCP
Q2_OCP
I(Q3)
SYS
VSYSMIN
ICHG_REG
I(Q2)
PGND
IHSFET_OCP
EN_HIZ
EN_CHARGE
EN_BOOST
REFRESH
VBTST-SW
VBTST_REFRESH
SYS
ICHG
VBAT_REG
ICHG_REG
REF
DAC
BAD_SRC
CONVERTER
CONTROL
TSHUT
STATE
MACHINE
ILIM
PSEL
USB Host
Adapter
Detection
BAT_GD
USB
Adapter
OTG
RECHRG
INT
I2C
Interface
SCL
14
SDA
BATSHORT
BATFET (Q4)
IDC
BAT
IC TJ
TSHUT
REGN
BAT
VBATGD
VBAT_REG - VRECHG
BAT
ICHG
TERMINATION
CHARGE
ITERM
CONTROL
SUSPEND
STATE
VBATLOWV
MACHINE BATLOWV
BAT
STAT
PG
IBADSRC
Q4 Gate
Control
QON
bq24298
BATTERY
THERMISTER
SENSING
TS
VSHORT
BAT
CE
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8.3 Feature Description
8.3.1 Device Power Up
8.3.1.1 Power-On-Reset (POR)
The internal bias circuits are powered from the higher voltage of VBUS and BAT. When VBUS or VBAT rises
above UVLOZ, the sleep comparator, battery depletion comparator and BATFET driver are active. I2C interface
is ready for communication and all the registers are reset to default value. The host can access all the registers
after POR.
8.3.1.2 Power Up from Battery without DC Source
If only battery is present and the voltage is above depletion threshold (VBAT_DEPL), the BATFET turns on and
connects battery to system. The REGN LDO stays off to minimize the quiescent current. The low RDSON in
BATFET and the low quiescent current on BAT minimize the conduction loss and maximize the battery run time.
8.3.1.2.1 BATFET Turn Off
The BATFET can be forced off by the host through I2C REG07[5] with a typical 9 s delay. This bit allows the user
to independently turn off the BATFET when the battery condition becomes abnormal during charging. When
BATFET is off, there is no path to charge or discharge the battery. When battery is not attached, the BATFET
should be turned off by setting REG07[5] to 1 to disable charging and supplement mode.
8.3.1.2.2 Shipping Mode
To extend battery life and minimize power when system is powered off during system idle, shipping, or storage,
the device can turn off BATFET so that the system voltage is zero to minimize the leakage. The BATFET can be
turned off by setting REG07[5] (BATFET_DISABLE) bit.
In order to keep BATFET off during shipping mode, the host has to disable the watchdog timer (REG05[5:4] =
00) and disable BATFET (REG07[5] = 1) at the same time. Once the BATFET is disabled, one of the following
events can turn on BATFET and clear REG07[5] (BATFET_DISABLE) bit.
1. Plug in adapter
2. Write REG07[5] = 0
3. watchdog timer expiration
4. Register reset (REG01[7] = 1)
5. A logic high to low transition on QON pin with longer than tQON_ON_1 0.6s to 1.5s typically deglitch turns on
BATFET and exit shipping mode.
8.3.1.2.3 BATFET System Reset
When QON is driven to logic low by at least tQON_RST 12.5s typically while VBUS is not plugged in and
BATFET_DISABLE = 0, the BATFET is turned off for tBATFET_RST which is usually between 250ms and 400ms.
The BATFET is re-enabled after tBATFET_RST duration. This function allows systems connected to SYS to have
power-on-reset. This function can be disabled by setting BATFET_RST_EN bit to 0.
8.3.1.3 Power Up from DC Source
When the DC source plugs in, the charger device checks the input source voltage to turn on REGN LDO and all
the bias circuits. It also checks the input current limit before starts the buck converter.
8.3.1.3.1 REGN LDO
The REGN LDO supplies internal bias circuits as well as the HSFET and LSFET gate drive. The LDO also
provides bias rail to TS external resistors. The pull-up rail of STAT and PG (bq24298)can be connected to REGN
as well.
The REGN is enabled when all the conditions are valid.
1. VBUS above VVBUS_UVLOZ
2. VBUS above VBAT + VSLEEPZ in buck mode or VBUS below VBAT + VSLEEP in boost mode
3. After typical 220-ms delay (100 ms minimum) is complete
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Feature Description (continued)
If one of the above conditions is not valid, the device is in high impedance mode (HIZ) with REGN LDO off. The
device draws less than IVBUS (15 µA typical) from VBUS during HIZ state. The battery powers up the system
when the device is in HIZ.
8.3.1.3.2 Input Source Qualification
After REGN LDO powers up, the device checks the current capability of the input source. The input source has
to meet the following requirements to start the buck converter.
1. VBUS voltage below VACOV (not in VBUS over-voltage)
2. VBUS voltage above VBADSRC (3.8 V typical) when pulling IBADSRC (30 mA typical) (poor source detection)
Once the input source passes all the conditions above, the status register REG08[2] goes high and the PG pin
(bq24298) goes low. An INT is asserted to the host.
If the device fails the poor source detection, it will repeat the detection every 2 seconds.
8.3.1.3.3 Input Current Limit Detection
After the PG is LOW (bq24298)or REG08[2] goes HIGH, the charger device always runs input current limit
detection when a DC source plugs in unless the charger is in HIZ during host mode.
The bq24298 sets input current limit through PSEL and OTG pins. After the input current limit detection is done,
the detection result is reported in VBUS_STAT registers (REG08[7:6]) and input current limit is updated in IINLIM
register (REG00[2:0]). In addition, host can write to REG00[2:0] to change the input current limit.
8.3.1.3.4 PSEL/OTG Pins Set Input Current Limit
The bq24298 has PSEL pin which directly takes the USB PHY device output to decide whether the input is USB
host or charging port.
Table 2. bq24298 Input Current Limit Detection
PSEL
OTG
INPUT CURRENT LIMIT
REG08[7:6]
HIGH
LOW
100 mA
01
HIGH
HIGH
500 mA
01
LOW
—
3A
10
8.3.1.3.5 HIZ State with 100mA USB Host
In battery charging spec, the good battery threshold is the minimum charge level of a battery to power up the
portable device successfully. When the input source is 100-mA USB host, and the battery is above bat-good
threshold (VBATGD), the device follows battery charging spec and enters high impedance state (HIZ). In HIZ state,
the device is in the lowest quiescent state with REGN LDO and the bias circuits off. The charger device sets
REG00[7] to 1, and the VBUS current during HIZ state will be less than 30 µA. The system is supplied by the
battery.
Once the charger device enters HIZ state in host mode, it stays in HIZ until the host writes REG00[7] = 0. When
the processor host wakes up, it is recommended to first check if the charger is in HIZ state.
In default mode, the charger IC will reset REG00[7] back to 0 when input source is removed. When another
source plugs in, the charger IC will run detection again, and update the input current limit.
8.3.1.3.6 Force Input Current Limit Detection
While adapter is plugged-in, the host can force the charger device to run input current limit detection by setting
REG07[7] = 1 or when watchdog timeout. During the forced detection, the input current limit is set to 100 mA.
After the detection is completed, REG07[7] will return to 0 by itself and new input current limit is set based on
PSEL/OTG (bq24298).
8.3.1.4 Converter Power-Up
After the input current limit is set, the converter is enabled and the HSFET and LSFET start switching. If battery
charging is disabled, BATFET turns off. Otherwise, BATFET stays on to charge the battery.
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The device provides soft-start when ramp up the system rail. When the system rail is below 2.2 V, the input
current limit is forced to 100mA. After the system rises above 2.2 V, the charger device sets the input current
limit set by the lower value between register and ILIM pin.
As a battery charger, the charger deploys a 1.5-MHz step-down switching regulator. The fixed frequency
oscillator keeps tight control of the switching frequency under all conditions of input voltage, battery voltage,
charge current and temperature, simplifying output filter design.
A type III compensation network allows using ceramic capacitors at the output of the converter. An internal sawtooth ramp is compared to the internal error control signal to vary the duty cycle of the converter. The ramp
height is proportional to the PMID voltage to cancel out any loop gain variation due to a change in input voltage.
In order to improve light-load efficiency, the device switches to PFM control at light load when battery is below
minimum system voltage setting or charging is disabled. During the PFM operation, the switching duty cycle is
set by the ratio of SYS and VBUS.
8.3.1.5 Boost Mode Operation from Battery
The device supports boost converter operation to deliver power from the battery to other portable devices
through USB port. The boost mode output current rating meets the USB On-The-Go 1-A output requirement. The
maximum output current is 1.5 A. The boost operation can be enabled if the following conditions are valid:
1. BAT above BATLOWV threshold (VBATLOWV set by REG04[1])
2. VBUS less than VBAT + VSLEEP (in sleep mode)
3. Boost mode operation is enabled (OTG pin HIGH and REG01[5:4] = 10)
4. Thermistor Temperature is within boost mode temperature monitor threshold unless BHOT[1:0] is set to 11
(REG06[1:0]) to disable this monitor function
5. After 30ms delay from boost mode enable
In boost mode, the device employs a 1.5-MHz step-up switching regulator. Similar to buck operation, the device
switches from PWM operation to PFM operation at light load to improve efficiency.
During boost mode, the status register REG08[7:6] is set to 11, the VBUS output is 5 V and the output current
can reach up to 1 A or 1.5 A, selected via I2C (REG01[0]). In addition, the device provides adjustable boost
voltage from 4.55 V to 5.5 V by changing BOOSTV bits in REG06[7:4]
Any fault during boost operation, including VBUS over-voltage or over-current, sets the fault register REG09[6] to
1 and an INT is asserted.
8.3.2 Power Path Management
The device accommodates a wide range of input sources from USB, wall adapter, to car battery. The device
provides automatic power path selection to supply the system (SYS) from input source (VBUS), battery (BAT), or
both.
8.3.2.1 Narrow VDC Architecture
The device deploys Narrow VDC architecture (NVDC) with BATFET separating system from battery. The
minimum system voltage is set by REG01[3:1]. Even with a fully depleted battery, the system is regulated above
the minimum system voltage (default 3.5 V).
When the battery is below minimum system voltage setting, the BATFET operates in linear mode (LDO mode),
and the system is 150 mV above the minimum system voltage setting. As the battery voltage rises above the
minimum system voltage, BATFET is fully on and the voltage difference between the system and battery is the
VDS of BATFET. The status register REG08[0] goes high when the system is in minimum system voltage
regulation.
When the battery charging is disabled or terminated, and the battery voltage is above the minimum system
voltage setting, the system is always regulated at 70 mV above the battery voltage.
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4.5
4.3
Charge Enabled
SYS (V)
4.1
3.9
Charge Disabled
3.7
3.5
Minimum System Voltage Setting
3.3
3.1
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3
BAT (V)
Figure 11. V(SYS) vs V(BAT)
8.3.2.2 Dynamic Power Management
To meet maximum current limit in USB spec and avoid over loading the adapter, the device features Dynamic
Power Management (DPM), which continuously monitors the input current and input voltage.
When input source is over-loaded, either the current exceeds the input current limit (REG00[2:0]) or the voltage
falls below the input voltage limit (REG00[6:3]). The device then reduces the charge current until the input current
falls below the input current limit and the input voltage rises above the input voltage limit.
When the charge current is reduced to zero, but the input source is still overloaded, the system voltage starts to
drop. Once the system voltage falls below the battery voltage, the device automatically enters the supplement
mode where the BATFET turns on and battery starts discharging so that the system is supported from both the
input source and battery.
During DPM mode (either VINDPM or IINDPM), the status register REG08[3] will go high.
Figure 12 shows the DPM response with 5-V/1.2-A adapter, 3.2-V battery, 2.0-A charge current and 3.4-V
minimum system voltage setting.
Voltage
VBUS
5V
SYS
3.6V
3.4V
3.2V
3.18V
BAT
Current
3A
ICHG
2.3A
2.0A
ISYS
1.5A
1.0A
0.5A
IIN
-0.7A
DPM
DPM
Supplement
Figure 12. DPM Response
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8.3.2.3 Supplement Mode
When the system voltage falls below the battery voltage, the BATFET turns on and the BATFET gate is
regulated the gate drive of BATFET so that the minimum BATFET VDS stays at 30 mV when the current is low.
This prevents oscillation from entering and exiting the supplement mode. As the discharge current increases, the
BATFET gate is regulated with a higher voltage to reduce RDSON until the BATFET is in full conduction. At this
point onwards, the BATFET VDS linearly increases with discharge current. Figure 13 shows the V-I curve of the
BATFET gate regulation operation. BATFET turns off to exit supplement mode when the battery is below battery
depletion threshold.
3.0
CURRENT (A)
2.5
2.0
1.5
1.0
0.5
0
0
10
20
30
40
50
60
70
80
V(BAT-SYS) (mV)
Figure 13. BATFET V-I Curve
8.3.3 Battery Charging Management
The device charges 1-cell Li-Ion battery with up to 3-A charge current for high capacity tablet battery. The 24-mΩ
BATFET improves charging efficiency and minimizes the voltage drop during discharging.
8.3.3.1 Autonomous Charging Cycle
With battery charging enabled at POR (REG01[5:4] = 01), the charger device complete a charging cycle without
host involvement. The device default charging parameters are listed in the following table.
Table 3. Charging Parameter Default Setting
(1)
A
•
•
•
•
•
DEFAULT MODE
bq24298
Charging voltage
4.208 V
Charging current
2.048 A
Pre-charge current
128 mA
Termination current
256 mA
Temperature profile
Hot/Cold
Safety timer
12 hours (1)
See Charging Safety Timer for more information.
new charge cycle starts when the following conditions are valid:
Converter starts
Battery charging is enabled by I2C register bit (REG01[5:4]) = 01 and CE is low
No thermistor fault on TS
No safety timer fault
BATFET is not forced to turn off (REG07[5])
The charger device automatically terminates the charging cycle when the charging current is below termination
threshold and charge voltage is above recharge threshold. When a full battery voltage is discharged below
recharge threshold (REG04[0]), the device automatically starts another charging cycle. After the charge done,
either toggle CE pin or REG01[5:4] will initiate a new charging cycle.
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The STAT output indicates the charging status of charging (LOW), charging complete or charge disable (HIGH)
or charging fault (Blinking). The status register REG08[5:4] indicates the different charging phases: 00-charging
disable, 01-precharge, 10-fast charge (constant current) and constant voltage mode, 11-charging done. Once a
charging cycle is complete, an INT is asserted to notify the host.
The host can always control the charging operation and optimize the charging parameters by writing to the
registers through I2C.
8.3.3.2 Battery Charging Profile
The device charges the battery in three phases: preconditioning, constant current and constant voltage. At the
beginning of a charging cycle, the device checks the battery voltage and applies current.
Table 4. Charging Current Setting
VBAT
CHARGING CURRENT
REG DEFAULT SETTING
REG08[5:4]
VBAT < VSHORT
(Typical 2 V)
100 mA
–
01
VSHORT ≤ VBAT < VBATLOWV
(Typical 2 V ≤ VBAT < 3 V)
REG03[7:4]
128 mA
01
VBAT ≥ VBATLOWV
(Typical VBAT ≥ 3 V)
REG02[7:2]
2048 mA
10
If the charger device is in DPM regulation or thermal regulation during charging, the actual charging current will
be less than the programmed value. In this case, termination is temporarily disabled and the charging safety
timer is counted at half the clock rate.
Regulation Voltage
(3.5V – 4.4V)
Battery Voltage
Fast Charge Current
(500mA-3008mA)
Charge Current
VBAT_LOWV (2.8V/3V)
VBAT_SHORT (2V)
IPRECHARGE (128mA-2048mA)
ITERMINATION (128mA-2048mA)
IBATSHORT (100mA)
Trickle Charge
Pre-charge
Fast Charge and Voltage Regulation
Safety Timer
Expiration
Figure 14. Battery Charging Profile
8.3.3.3 Thermistor Qualification
The charger device provides a single thermistor input for battery temperature monitor.
8.3.3.3.1 Cold/Hot Temperature Window
The device continuously monitors battery temperature by measuring the voltage between the TS pin and ground,
typically determined by a negative temperature coefficient thermistor and an external voltage divider. The device
compares this voltage against its internal thresholds to determine if charge or boost is allowed.
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To initiate a charge cycle, the battery temperature must be within the VLTF to VHTF thresholds. During the charge
cycle the battery temperature must be within the VLTF to VTCO thresholds, else the device suspends charging and
waits until the battery temperature is within the VLTF to VHTF range.
For battery protection during boost mode, the device monitors the battery temperature to be within the VBCOLDx
to VBHOTx thresholds unless boost mode temperature is disabled by setting BHOT bits (REG06[3:2]) to 11.
When temperature is outside of the temperature thresholds, the boost mode is suspended and REG08[7:6] bits
(VBUS_STAT) are set to 00. Once temperature returns within thresholds, the boost mode is recovered.
REGN
bq24298
RT1
TS
RT2
RTH
103AT
Figure 15. TS Resistor Network
When the TS fault occurs, the fault register REG09[2:0] indicates the actual condition on each TS pin and an INT
is asserted to the host. The STAT pin indicates the fault when charging is suspended.
TEMPERATURE RANGE TO
INITIATE CHARGE
TEMPERATURE RANGE
DURING A CHARGE CYCLE
VREGN
VREGN
CHARGE SUSPENDED
CHARGE SUSPENDED
VLTF
VLTF
VLTFH
VLTFH
CHARGE at full C
CHARGE at full C
VHTF
VTCO
CHARGE SUSPENDED
CHARGE SUSPENDED
AGND
AGND
Figure 16. TS Pin Thermistor Sense Thresholds in Charge Mode
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VREGN
V BCOLDx
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Temperature Range to
Boost
Boost Disable
(-10ºC / -20ºC)
Boost Enable
V
BHOTx
(55ºC / 60ºC / 65ºC)
Boost Disable
AGND
Figure 17. TS Pin Thermistor Sense Thresholds in Boost Mode
Assuming a 103AT NTC thermistor is used on the battery pack Figure 16, the value RT1 and RT2 can be
determined by using the following equation:
æ 1
1 ö
VREGN ´ RTHCOLD ´ RTHHOT ´ ç
÷
V
V
TCO ø
è LTF
RT2 =
æV
ö
æV
ö
RTHHOT ´ ç REGN - 1÷ - RTHCOLD ´ ç REGN - 1÷
è VLTF
ø
è VTCO
ø
VREGN
-1
VLTF
RT1 =
1
1
+
RT2 RTHCOLD
(1)
Select 0°C to 45°C range for Li-ion or Li-polymer battery,
RTHCOLD = 27.28 kΩ
RTHHOT = 4.911 kΩ
RT1 = 5.25 kΩ
RT2 = 31.23 kΩ
8.3.3.4 Charging Termination
The device terminates a charge cycle when the battery voltage is above recharge threshold, and the current is
below termination current. After the charging cycle is complete, the BATFET turns off. The converter keeps
running to power the system, and BATFET can turn back on to engage supplement mode.
When termination occurs, the status register REG08[5:4] is 11, and an INT is asserted to the host. Termination is
temporarily disabled if the charger device is in input current/voltage regulation or thermal regulation. Termination
can be disabled by writing 0 to REG05[7].
8.3.3.4.1 Termination When REG02[0] = 1
When REG02[0] is HIGH to reduce the charging current by 80%, the charging current could be less than the
termination current. The charger device termination function should be disabled. When the battery is charged to
fully capacity, the host disables charging through CE pin or REG01[5:4].
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8.3.3.5 Charging Safety Timer
The device has safety timer to prevent extended charging cycle due to abnormal battery conditions. The safety
timer is 4 hours when the battery is below batlowv threshold. The user can program fast charge safety timer
(default 12 hours) through I2C (REG05[2:1]). When safety timer expires, the fault register REG09[5:4] goes 11
and an INT is asserted to the host. The safety timer feature can be disabled via I2C (REG05[3]).
The following actions restart the safety timer after safety timer expires:
• Toggle the CE pin HIGH to LOW to HIGH (charge enable)
• Write REG01[5:4] from 00 to 01 (charge enable)
• Write REG05[3] from 0 to 1 (safety timer enable)
During input voltage/current regulation, thermal regulation, or FORCE_20PCT bit (REG02[0]) is set , the safety
timer counting at half clock rate since the actual charge current is likely to be below the register setting. For
example, if the charger is in input current regulation (IINDPM) throughout the whole charging cycle, and the
safety time is set to 5 hours, the safety timer will expire in 10 hours. This feature can be disabled by writing 0 to
REG07[6].
8.3.3.5.1 Safety Timer Configuration Change
When safety timer value needs to be changed, it is recommended that the timer is disabled first before new
configuration is written to REG05[2:1]. The safety timer can be disable by writing 1 to REG05[3]. This ensures
the safety timer restart counting after new value is configured.
8.3.3.6 USB Timer When Charging from USB100mA Source
The total charging time in default mode from USB100mA source is limited by a 45-min max timer. At the end of
the timer, the device stops the converter and goes to HIZ.
8.3.4 Status Outputs (PG, STAT, and INT)
8.3.4.1 Power Good Indicator (PG) (bq24298)
In bq24298,PG goes LOW to indicate a good input source when:
1. VBUS above VBUS_UVLO
2. VBUS above battery (not in sleep)
3. VBUS below VACOV threshold
4. VBUS above VBUS_MIN when IBADSRC current is applied (not a poor source)
8.3.4.2 Charging Status Indicator (STAT)
The device indicates charging state on the open drain STAT pin. The STAT pin can drive LED as the application
diagram shows.
Table 5. STAT Pin State
CHARGING STATE
STAT
Charging in progress (including recharge)
LOW
Charging complete
HIGH
Sleep mode, charge disable
HIGH
8.3.4.3 Interrupt to Host (INT)
In some applications, the host does not always monitor the charger operation. The INT notifies the system on the
device operation. The following events will generate a 256-µs INT pulse.
1. USB/adapter source identified (through PSEL detection and OTG pin)
2. Good input source detected
– not in sleep
– VBUS below VACOV threshold
– current limit above IBADSRC
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3. Input removed or VBUS above VACOV threshold
4. Charge Complete
5. Any FAULT event in REG09
For the first four events, INT pulse is always generated. For the last event, when a fault occurs, the charger
device sends out INT and latches the fault state in REG09 until the host reads the fault register. If a prior fault
exists, the charger device would not send any INT upon new faults except NTC fault (REG09[2:0]). The NTC
fault is not latched and always reports the current thermistor conditions. In order to read the current fault status,
the host has to read REG09 two times consecutively. The 1st reads fault register status from the last read and
the 2nd reads the current fault register status.
8.3.5 Protections
8.3.5.1 Input Current Limit on ILIM
For safe operation, the device has an additional hardware pin on ILIM to limit maximum input current on ILIM pin.
The input maximum current is set by a resistor from ILIM pin to ground as:
1V
I INMAX =
´ KLIM
RILIM
(2)
The actual input current limit is the lower value between ILIM setting and register setting (REG00[2:0]). For
example, if the register setting is 111 for , and ILIM has a 316-Ω resistor to ground for 1.5 A, the input current
limit is 1.5 A. ILIM pin can be used to set the input current limit rather than the register settings.
The device regulates ILIM pin at 1 V. If ILIM voltage exceeds 1 V, the device enters input current regulation
(Refer to Dynamic Power Path Management section).
The voltage on ILIM pin is proportional to the input current. ILIM pin can be used to monitor the input current
following Equation 3:
V
I IN = ILIM ´ IINMAX
(3)
1V
For example, if ILIM pin sets 2 A, and the ILIM voltage is 0.75 V, the actual input current 1.5 A. If ILIM pin is
open, the input current is limited to zero since ILIM voltage floats above 1 V. If ILIM pin is short, the input current
limit is set by the register.
8.3.5.2 Thermal Regulation and Thermal Shutdown
During charge operation, the device monitors the internal junction temperature TJ to avoid overheat the chip and
limits the IC surface temperature. When the internal junction temperature exceeds the preset limit (REG06[1:0]),
the device lowers down the charge current. The wide thermal regulation range from 60°C to 120°C allows the
user to optimize the system thermal performance.
During thermal regulation, the actual charging current is usually below the programmed battery charging current.
Therefore, termination is disabled, the safety timer runs at half the clock rate, and the status register REG08[1]
goes high.
Additionally, the device has thermal shutdown to turn off the converter. The fault register REG09[5:4] is 10 and
an INT is asserted to the host.
8.3.5.3 Voltage and Current Monitoring in Buck Mode
The device closely monitors the input and system voltage, as well as HSFET current for safe buck mode
operation.
8.3.5.3.1 Input Over-Voltage (ACOV)
The maximum input voltage for buck mode operation is VVBUS_OP. If VBUS voltage exceeds VACOV, the device
stops switching immediately. During input over voltage (ACOV), the fault register REG09[5:4] will be set to 01. An
INT is asserted to the host.
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8.3.5.3.2 System Over-Voltage Protection (SYSOVP)
The charger device clamps the system voltage during load transient so that the components connect to system
would not be damaged due to high voltage. When SYSOVP is detected, the converter stops immediately to
clamp the overshoot.
8.3.5.4 Voltage and Current Monitoring in Boost Mode
The charger device closely monitors the VBUS voltage, as well as HSFET current to ensure safe boost mode
operation.
8.3.5.4.1 Over-Current Protection
The charger device closely monitors the RBFET (Q1) and LSFET (Q3) current to ensure safe boost mode
operation. During over-current condition,
1. If the over-current condition is not severe, the device will operate in hiccup mode for protection. While in
hiccup mode cycle, the device turns off RBFET for tOTG_OCP_OFF (32 ms typical) and turns on RBFET for
tOTG_OCP_ON (260 µs typical) in an attempt to restart. If the over-current condition is removed, the boost
converter will maintain the RBFET on state and the VBUS OTG output will operate normally. When overcurrent condition continues to exist, the device will repeat the hiccup cycle until over-current condition is
removed.
2. If the over-current condition is severe, the device will shut down the RBFET (Q1) and reset all the registers.
When over-current condition is detected, the fault register bit BOOST_FAULT (REG09[6]) is set high to indicate
fault in boost operation. An INT is asserted to the host.
8.3.5.4.2 VBUS Over-Voltage Protection
When an adapter plugs in during boost mode, the VBUS voltage will rise above regulation target. Once the
VBUS voltage exceeds VOTG_OVP, the device stops switching and the device exits boost mode. During the overvoltage, the fault register bit BOOST_FAULT (REG09[6]) is set high to indicate fault in boost operation. An INT is
asserted to the host.
8.3.5.4.3 Output Short Protection
In addition, the device monitors BATFET current to provide short protection. The OTG mode is turned off and
OTG_CONFIG bit is cleared when output short is detected. The host can re-enable OTG mode by setting
OTG_CONFIG bit and OTG pin high.
8.3.5.5 Battery Protection
8.3.5.5.1 Battery Over-Voltage Protection (BATOVP)
The battery over-voltage limit is clamped at VBAT_OVP (4% nominal) above the battery regulation voltage. When
battery over voltage occurs, the charger device immediately disables charge. The fault register REG09[3] goes
high and an INT is asserted to the host.
8.3.5.5.2 Battery Short Protection
If the battery voltage falls below Vshort (2V typical), the device immediately turns off BATFET to disable the
battery charging or supplement mode. 1ms later, the BATFET turns on and charge the battery with 100-mA
current. The device does not turn on BATFET to discharge a battery that is below 2.5 V.
8.4 Device Functional Modes
8.4.1 Host Mode and Default Mode
The device is a host controlled device, but it can operate in default mode without host management. In default
mode, the device can be used as an autonomous charger with no host or with host in sleep.
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Device Functional Modes (continued)
When the charger is in default mode, REG09[7] is HIGH. When the charger is in host mode, REG09[7] is LOW.
After power-on-reset, the device starts in watchdog timer expiration state, or default mode. All the registers are in
the default settings. The device keeps charging the battery by default with 12-hour fast charging safety timer. At
the end of the 12 hours, the charging is stopped and the buck converter continues to operate to supply system
load.
Any write command to device transitions the device from default mode to host mode. All the device parameters
can be programmed by the host. To keep the device in host mode, the host has to reset the watchdog timer by
writing 1 to REG01[6] before the watchdog timer expires (REG05[5:4]), or disable watchdog timer by setting
REG05[5:4] = 00.
When the host changes watchdog timer configuration (REG05[5:4]), it is recommended to first disable watchdog
by writing 00 to REG05[5:4] and then change the watchdog to new timer values. This ensures the watchdog
timer is restarted after new value is written.
POR
watchdog timer expired
Reset registers
I2C interface enabled
Host Mode
Y
I2C Write?
Start watchdog timer
Host programs registers
N
Default Mode
Reset watchdog timer
Reset registers
N
Y
Reset REG01
bit[6]?
Y
N
I2C Write?
Y
N
Watchdog Timer
Expired?
Figure 18. Watchdog Timer Flow Chart
8.4.1.1 Plug in USB100mA Source with Good Battery
When the input source is detected as 100mA USB host, and the battery voltage is above batgood threshold
(VBATGD), the charger device enters HIZ state to meet the battery charging spec requirement.
If the charger device is in host mode, it will stay in HIZ state even after the USB100mA source is removed, and
the adapter plugs in. During the HIZ state, REG00[7] is set HIGH and the system load is supplied from battery. It
is recommended that the processor host always checks if the charger IC is in HIZ state when it wakes up. The
host can write REG00[7] to 0 to exit HIZ state.
If the charger is in default mode, when the DC source is removed, the charger device will get out of HIZ state
automatically. When the input source plugs in again, the charger IC runs detection on the input source and
update the input current limit.
8.4.1.2 USB Timer When Charging from USB100mA Source
The total charging time in default mode from USB100mA source is limited by a 45-min max timer. At the end of
the timer, the device stops the converter and goes to HIZ.
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8.5 Programming
8.5.1 Serial Interface
The device uses I2C compatible interface for flexible charging parameter programming and instantaneous device
status reporting. I2C is a bi-directional 2-wire serial interface developed by Philips Semiconductor (now NXP
Semiconductors). Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Devices
can be considered as masters or slaves when performing data transfers. A master is the device which initiates a
data transfer on the bus and generates the clock signals to permit that transfer. At that time, any device
addressed is considered a slave.
The device operates as a slave device with address 6BH, receiving control inputs from the master device like
micro controller or a digital signal processor. The I2C interface supports both standard mode (up to 100 kbits),
and fast mode (up to 400 kbits).
Both SDA and SCL are bi-directional lines, connecting to the positive supply voltage via a current source or pullup resistor. When the bus is free, both lines are HIGH. The SDA and SCL pins are open drain.
8.5.1.1 Data Validity
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the
data line can only change when the clock signal on the SCL line is LOW. One clock pulse is generated for each
data bit transferred.
SDA
SCL
Data line stable;
Data valid
Change
of data
allowed
Figure 19. Bit Transfer on the I2C Bus
8.5.1.2 START and STOP Conditions
All transactions begin with a START (S) and can be terminated by a STOP (P). A HIGH to LOW transition on the
SDA line while SCl is HIGH defines a START condition. A LOW to HIGH transition on the SDA line when the
SCL is HIGH defines a STOP condition.
START and STOP conditions are always generated by the master. The bus is considered busy after the START
condition, and free after the STOP condition.
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Programming (continued)
SDA
SDA
SCL
SCL
STOP (P)
START (S)
Figure 20. START and STOP Conditions
8.5.1.3 Byte Format
Every byte on the SDA line must be 8 bits long. The number of bytes to be transmitted per transfer is
unrestricted. Each byte has to be followed by an Acknowledge bit. Data is transferred with the Most Significant
Bit (MSB) first. If a slave cannot receive or transmit another complete byte of data until it has performed some
other function, it can hold the clock line SCL low to force the master into a wait state (clock stretching). Data
transfer then continues when the slave is ready for another byte of data and release the clock line SCL.
Acknowledgement
signal from receiver
Acknowledgement
signal from slave
MSB
SDA
SCL
S or Sr
2
1
7
8
START or
Repeated
START
2
1
9
ACK
8
9
ACK
P or Sr
STOP or
Repeated
START
Figure 21. Data Transfer on the I2C Bus
8.5.1.4 Acknowledge (ACK) and Not Acknowledge (NACK)
The acknowledge takes place after every byte. The acknowledge bit allows the receiver to signal the transmitter
that the byte was successfully received and another byte may be sent. All clock pulses, including the
acknowledge 9th clock pulse, are generated by the master.
The transmitter releases the SDA line during the acknowledge clock pulse so the receiver can pull the SDA line
LOW and it remains stable LOW during the HIGH period of this clock pulse.
When SDA remains HIGH during the 9th clock pulse, this is the Not Acknowledge signal. The master can then
generate either a STOP to abort the transfer or a repeated START to start a new transfer.
8.5.1.5 Slave Address and Data Direction Bit
After the START, a slave address is sent. This address is 7 bits long followed by the eighth bit as a data direction
bit (bit R/W). A zero indicates a transmission (WRITE) and a one indicates a request for data (READ).
SDA
SCL
S
1-7
8
9
START
ADDRESS
R/W
ACK
8
1-7
DATA
9
8
1-7
ACK
DATA
9
P
ACK
STOP
Figure 22. Complete Data Transfer
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Programming (continued)
8.5.1.5.1 Single Read and Write
1
7
1
1
8
1
8
1
1
S
Slave Address
0
ACK
Reg Addr
ACK
Data Addr
ACK
P
Figure 23. Single Write
1
7
1
1
8
1
1
7
1
1
S
Slave Address
0
ACK
Reg Addr
ACK
S
Slave Address
1
ACK
8
1
1
Data
NCK
P
Figure 24. Single Read
If the register address is not defined, the charger IC send back NACK and go back to the idle state.
8.5.1.5.2 Multi-Read and Multi-Write
The charger device supports multi-read and multi-write on REG00 through REG08.
1
7
1
1
S
Slave Address
0
ACK
8
1
Reg Addr
ACK
8
1
8
1
8
1
1
Slave Address
ACK
Data to Addr+1
ACK
Data to Addr+1
ACK
P
Figure 25. Multi-Write
1
7
1
1
8
1
1
7
1
1
S
Slave Address
0
ACK
Reg Addr
ACK
S
Slave Address
1
ACK
8
Data @ Addr
1
8
1
8
1
1
ACK
Data @ Addr+1
ACK
Data @ Addr+1
ACK
P
Figure 26. Multi-Read
The fault register REG09 locks the previous fault and only clears it after the register is read. For example, if
Charge Safety Timer Expiration fault occurs but recovers later, the fault register REG09 reports the fault when it
is read the first time, but returns to normal when it is read the second time. To verify real time fault, the fault
register REG09 should be read twice to get the real condition. In addition, the fault register REG09 does not
support multi-read or multi-write.
REG09 is a fault register. It keeps all the fault information from last read until the host issues a new read. For
example, if there is a TS fault but gets recovered immediately, the host still sees TS fault during the first read. In
order to get the fault information at present, the host has to read REG09 for the second time. REG09 does not
support multi-read and multi-write.
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8.6 Register Map
8.6.1 I2C Registers
Address: 6BH. REG00-07 support Read and Write. REG08-0A are Read only.
8.6.1.1 Input Source Control Register REG00 [reset = 00110xxx, or 3x]
Figure 27. Input Source Control Register REG00 Format
7
EN_HIZ
R/W
6
VINDPM[3]
R/W
5
VINDPM[2]
R/W
4
VINDPM[1]
R/W
3
VINDPM[0]
R/W
2
IINLIM[2]
R/W
1
IINLIM[1]
R/W
0
IINLIM[0]
R/W
LEGEND: R/W = Read/Write
Table 6. Input Source Control Register REG00 Field Description
BIT
FIELD
TYPE
RESET
DESCRIPTION
NOTE
Bit 7
EN_HIZ
R/W
0
0 – Disable, 1 – Enable
Default: Disable (0)
Offset 3.88 V, Range: 3.88 V – 5.08 V
Default: 4.36 V (0110)
Input Voltage Limit
Bit 6
VINDPM[3]
R/W
0
640 mV
Bit 5
VINDPM[2]
R/W
1
320 mV
Bit 4
VINDPM[1]
R/W
1
160 mV
Bit 3
VINDPM[0]
R/W
0
80 mV
Input Current Limit (Actual input current limit is the lower of I2C and ILIM)
Bit 2
IINLIM[2]
R/W
x
Bit 1
IINLIM[1]
R/W
x
Bit 0
IINLIM[0]
R/W
x
30
000 – 100 mA, 001 – 150 mA,
010 – 500 mA, 011 – 900 mA, 100 – 1 A,
101 – 1.5 A,
110 – 2 A, 111 – 3A
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PSEL = Lo : 3 A (111)
PSEL = Hi : 100 mA (000) (OTG pin = Lo) or
500 mA (OTG pin = Hi)
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8.6.1.2 Power-On Configuration Register REG01 [reset = 00011011, or 0x1B]
Figure 28. Power-On Configuration Register REG01 Format
7
Register Reset
R/W
6
I2C Watchdog
Timer Reset
R/W
5
4
3
2
1
0
OTG_CONFIG
CHG_CONFIG
SYS_MIN[2]
SYS_MIN[1]
SYS_MIN[0]
BOOST_LIM
R/W
R/W
R/W
R/W
R/W
R/W
LEGEND: R/W = Read/Write
Table 7. Power-On Configuration Register REG01 Field Description
BIT
FIELD
Bit 7
Bit 6
TYPE
RESET
DESCRIPTION
NOTE
Register Reset R/W
0
0 – Keep current register setting,
1 – Reset to default
Default: Keep current register setting (0)
Note: Register Reset bit does not reset
device to default mode
I2C Watchdog
Timer Reset
R/W
0
0 – Normal ; 1 – Reset
Default: Normal (0)
Note: Consecutive I2C watchdog timer
reset requires minimum 20-µs delay
Bit 5
OTG_CONFIG R/W
0
0 – OTG Disable; 1 – OTG Enable
Default: OTG disable (0)
Note: OTG_CONFIG would over-ride
Charge Enable Function in
CHG_CONFIG
Bit 4
CHG_CONFIG R/W
1
0- Charge Disable; 1- Charge Enable
Default: Charge Battery (1)
Offset: 3.0 V, Range 3.0 V – 3.7 V
Default: 3.5 V (101)
Charger Configuration
Minimum System Voltage Limit
Bit 3
SYS_MIN[2]
R/W
1
0.4 V
Bit 2
SYS_MIN[1]
R/W
0
0.2 V
Bit 1
SYS_MIN[0]
R/W
1
0.1 V
Bit 0
BOOST_LIM
R/W
1
0 – 1 A, 1 – 1.5 A
Default: 1.5 A (1)
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8.6.1.3 Charge Current Control Register REG02 [reset = 01100000, or 60]
Figure 29. Charge Current Control Register REG02 Format
7
ICHG[5]
R/W
6
ICHG[4]
R/W
5
ICHG[3]
R/W
4
ICHG[2]
R/W
3
ICHG[1]
R/W
2
ICHG[0]
R/W
1
BCOLD
R/W
0
FORCE_20PCT
R/W
LEGEND: R/W = Read/Write
Table 8. Charge Current Control Register REG02 Field Description
BIT
FIELD
TYPE
RESET
DESCRIPTION
NOTE
Offset: 512 mA
Range: 512 – 3008 mA (000000 –
100111)
Default: 2048 mA (011000)
Note: ICHG higher than 3008mA is
not supported
Fast Charge Current Limit
Bit 7
ICHG[5]
R/W
0
2048 mA
Bit 6
ICHG[4]
R/W
1
1024 mA
Bit 5
ICHG[3]
R/W
1
512 mA
Bit 4
ICHG[2]
R/W
0
256 mA
Bit 3
ICHG[1]
R/W
0
128 mA
Bit 2
ICHG[0]
R/W
0
64 mA
Bit 1
BCOLD
R/W
0
Set Boost Mode temperature monitor
threshold voltage to disable boost mode
0 – Vbcold0 (Typ. 76% of REGN or -10°C
w/ 103AT thermistor )
1 – Vbcold1 (Typ. 79% of REGN or -20°C
w/ 103AT thermistor)
Default: Vbcold0 (0)
Bit 0
FORCE_20PCT
R/W
0
0 – ICHG as Fast Charge Current
(REG02[7:2]) and IPRECH as PreCharge Current (REG03[7:4])
programmed
1 – ICHG as 20% Fast Charge Current
(REG02[7:2]) and IPRECH as 50% PreCharge Current (REG03[7:4])
programmed
Default: ICHG as Fast Charge
Current (REG02[7:2]) and IPRECH
as Pre-Charge Current (REG03[7:4])
programmed (0)
8.6.1.4 Pre-Charge/Termination Current Control Register REG03 [reset = 00010001, or 0x11]
Figure 30. Pre-Charge/Termination Current Control Register REG03 Format
7
IPRECHG[3]
R/W
6
IPRECHG[2]
R/W
5
IPRECHG[1]
R/W
4
IPRECHG[0]
R/W
3
Reserved
R/W
2
ITERM[2]
R/W
1
ITERM[1]
R/W
0
ITERM[0]
R/W
LEGEND: R/W = Read/Write
Table 9. Pre-Charge/Termination Current Control Register REG03 Field Description
BIT
FIELD
TYPE
RESET
DESCRIPTION
NOTE
0000: 128 mA; 0001: 128 mA; 0010: Offset: 128 mA,
256 mA; 0011: 384 mA
Range: 128 mA – 2048 mA
0100: 512 mA; 0101: 768 mA; 0110: Default: 128 mA (0001)
896 mA; 0111: 1024 mA
1000: 1152 mA; 1001: 1280 mA;
1010: 1408 mA; 1011: 1536 mA
1100: 1664 mA; 1101: 1792 mA;
1110: 1920 mA; 1111: 2048 mA
Pre-Charge Current Limit
Bit 7
IPRECHG[3]
R/W
0
Bit 6
IPRECHG[2]
R/W
0
Bit 5
IPRECHG[1]
R/W
0
Bit 4
IPRECHG[0]
R/W
1
Bit 3
Reserved
R/W
0
0 - Reserved
Termination Current Limit
Bit 2
ITERM[2]
R/W
0
512 mA
Bit 1
ITERM[1]
R/W
0
256 mA
Bit 0
ITERM[0]
R/W
1
128 mA
32
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Offset: 128 mA
Range: 128 mA – 1024 mA
Default: 256 mA (001)
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8.6.1.5 Charge Voltage Control Register REG04 [reset = 10110010, or 0xB2]
Figure 31. Charge Voltage Control Register REG04 Format
7
VREG[5]
R/W
6
VREG[4]
R/W
5
VREG[3]
R/W
4
VREG[2]
R/W
3
VREG[1]
R/W
2
VREG[0]
R/W
1
BATLOWV
R/W
0
VRECHG
R/W
LEGEND: R/W = Read/Write
Table 10. Charge Voltage Control Register REG04 Field Description
BIT
FIELD
TYPE
RESET
DESCRIPTION
NOTE
Offset: 3.504 V
Range: 3.504 V – 4.400 V
Default: 4.208 V (101100)
Charge Voltage Limit
Bit 7
VREG[5]
R/W
1
512 mV
Bit 6
VREG[4]
R/W
0
256 mV
Bit 5
VREG[3]
R/W
1
128 mV
Bit 4
VREG[2]
R/W
1
64 mV
Bit 3
VREG[1]
R/W
0
32 mV
Bit 2
VREG[0]
R/W
0
16 mV
Bit 1
BATLOWV
R/W
1
0 – 2.8 V, 1 – 3.0 V
Default: 3.0 V (1) (pre-charge to fast charge)
Battery Recharge Threshold (below battery regulation voltage)
Bit 0
VRECHG
R/W
0
0 – 100 mV, 1 – 300 mV
Default: 100 mV (0)
8.6.1.6 Charge Termination/Timer Control Register REG05 [reset = 11011100, or 0xDC]
Figure 32. Charge Termination/Timer Control Register REG05 Format
7
EN_TERM
R/W
6
Reserved
R/W
5
4
WATCHDOG[1] WATCHDOG[0]
R/W
R/W
3
EN_TIMER
R/W
2
1
CHG_TIMER[1] CHG_TIMER[0]
R/W
R/W
0
Reserved
R/W
LEGEND: R/W = Read/Write
Table 11. Charge Termination/Timer Control Register REG05 Field Description
BIT
FIELD
TYPE
RESET
DESCRIPTION
NOTE
Charging Termination Enable
Bit 7
EN_TERM
R/W
1
0 – Disable, 1 – Enable
Default: Enable termination (1)
Bit 6
BATFET_RST_
EN
R/W
1
0 – Disable, 1 – Enable
Default: Enable (1)
This bit will only be reset to default value upon
power-on-reset and soft reset (i.e. REG01[7]).
00 – Disable timer, 01 – 40 s, 10 –
80 s, 11 – 160 s
Default: 40 s (01)
I2C Watchdog Timer Setting
Bit 5
WATCHDOG[1]
R/W
0
Bit 4
WATCHDOG[0]
R/W
1
Charging Safety Timer Enable
Bit 3
EN_TIMER
R/W
1
0 – Disable, 1 – Enable
Default: Enable (1)
00 – 5 hrs, 01 – 8 hrs, 10 – 12 hrs,
11 – 20 hrs
Default: 12 hrs (10)
(See Charging Safety Timer for details)
Fast Charge Timer Setting
Bit 2
CHG_TIMER[1]
R/W
1
Bit 1
CHG_TIMER[0]
R/W
0
Bit 0
Reserved
R/W
0
0 - Reserved
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8.6.1.7 Boost Voltage/Thermal Regulation Control Register REG06 [reset = 01110011, or 0x73]
Figure 33. Boost Voltage/Thermal Regulation Control Register REG06 Format
7
BOOSTV[3]
R/W
6
BOOSTV[2]
R/W
5
BOOSTV[1]
R/W
4
BOOSTV[0]
R/W
3
BHOT[1]
R/W
2
BHOT[0]
R/W
1
TREG[1]
R/W
0
TREG[0]
R/W
LEGEND: R/W = Read/Write
Table 12. Boost Voltage/Thermal Regulation Control Register REG06 Field Description
BIT
FIELD
TYPE
DESCRIPTION
NOTE
Bit 7
BOOSTV[3]
R/W
RESET
512 mV
Bit 6
BOOSTV[2]
R/W
256 mV
Offset: 4.55 V
Range: 4.55 V – 5.51 V
Default:4.998 V (0111)
Bit 5
BOOSTV[1]
R/W
128 mV
Bit 4
BOOSTV[0]
R/W
Bit 3
BHOT[1]
R/W
0
Bit 2
BHOT[0]
R/W
0
64 mV
Set Boost Mode temperature monitor
threshold voltage to disable boost
mode
Voltage to disable boost mode
00 – Vbhot1 (33% of REGN or 55°C
w/ 103AT thermistor)
01 – Vbhot0 (36% of REGN or 60°C
w/ 103AT thermistor)
10 – Vbhot2 (30% of REGN or 65°C
w/ 103AT thermistor)
11 – Disable boost mode thermal
protection.
Default: Vbhot1 (00)
Note: For BHOT[1:0] = 11, boost mode
operates without temperature monitor
and the NTC_FAULT is generated based
on Vbhot1 threshold
00 – 60°C, 01 – 80°C, 10 – 100°C,
11 – 120°C
Default: 120°C (11)
Thermal Regulation Threshold
Bit 1
TREG[1]
R/W
1
Bit 0
TREG[0]
R/W
1
34
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8.6.1.8 Misc Operation Control Register REG07 [reset = 01001011, or 4B]
Figure 34. Misc Operation Control Register REG07 Format
7
DPDM_EN
R/W
6
TMR2X_EN
R/W
5
BATFET_Disable
R/W
4
Reserved
R/W
3
Reserved
R/W
2
Reserved
R/W
1
INT_MASK[1]
R/W
0
INT_MASK[0]
R/W
LEGEND: R/W = Read/Write
Table 13. Misc Operation Control Register REG07 Field Description
BIT
FIELD
TYPE
RESET
DESCRIPTION
NOTE
R/W
0
0 – Not in Force detection;
1 – Force detection when VBUS
power is presence
Default: Not in Force detection (0), Back to 0
after detection complete
Force DPDM detection
Bit 7
DPDM_EN
Safety Timer Setting during Input DPM and Thermal Regulation
Bit 6
TMR2X_EN
R/W
1
0 – Safety timer not slowed by 2X
during input DPM or thermal
regulation,
1 – Safety timer slowed by 2X
during input DPM or thermal
regulation
Default: Safety timer slowed by 2X (1)
Force BATFET Off
Bit 5
BATFET_Disable
R/W
0
0 – Allow BATFET (Q4) turn on,
Default: Allow BATFET (Q4) turn on(0)
1 – Turn off BATFET (Q4) after 7 s
- 11 s
Bit 4
Reserved
R/W
0
0 - Reserved
Bit 3
Reserved
R/W
1
1 - Reserved
Bit 2
Reserved
R/W
0
0 - Reserved
Bit 1
INT_MASK[1]
R/W
1
0 – No INT during CHRG_FAULT,
1 – INT on CHRG_FAULT
Default: INT on CHRG_FAULT (1)
Bit 0
INT_MASK[0]
R/W
1
0 – No INT during BAT_FAULT,
1 – INT on BAT_FAULT
Default: INT on BAT_FAULT (1)
8.6.1.9 System Status Register REG08
Figure 35. System Status Register REG08 Format
7
6
5
VBUS_STAT[1] VBUS_STAT[0] CHRG_STAT[1]
R
R
R
4
3
2
1
0
CHRG_STAT[0]
R
DPM_STAT
R
PG_STAT
R
THERM_STAT
R
VSYS_STAT
R
LEGEND: R = Read only
Table 14. System Status Register REG08 Field Description
BIT
FIELD
TYPE
DESCRIPTION
Bit 7
VBUS_STAT[1]
R
Bit 6
VBUS_STAT[0]
R
00 – Unknown (no input, or DPDM detection incomplete), 01 – USB host, 10 – Adapter port, 11 –
OTG
Bit 5
CHRG_STAT[1]
R
Bit 4
CHRG_STAT[0]
R
Bit 3
DPM_STAT
R
0 – Not DPM, 1 – VINDPM or IINDPM
Bit 2
PG_STAT
R
0 – Not Power Good, 1 – Power Good
Bit 1
THERM_STAT
R
0 – Normal, 1 – In Thermal Regulation
Bit 0
VSYS_STAT
R
0 – Not in VSYSMIN regulation (BAT > VSYSMIN), 1 – In VSYSMIN regulation (BAT <
VSYSMIN)
00 – Not Charging, 01 – Pre-charge ( VBATUVLO
connected to BAT. The source current rating needs to be at least 3 A in order for the buck converter of the
charger to provide maximum output power to SYS.
11 Layout
11.1 Layout Guidelines
The switching node rise and fall times should be minimized for minimum switching loss. Proper layout of the
components to minimize high frequency current path loop (see Figure 48) is important to prevent electrical and
magnetic field radiation and high frequency resonant problems. Here is a PCB layout priority list for proper
layout. Layout PCB according to this specific order is essential.
1. Place input capacitor as close as possible to PMID pin and GND pin connections and use shortest copper
trace connection or GND plane.
2. Place inductor input pin to SW pin as close as possible. Minimize the copper area of this trace to lower
electrical and magnetic field radiation but make the trace wide enough to carry the charging current. Do not
use multiple layers in parallel for this connection. Minimize parasitic capacitance from this area to any other
trace or plane.
3. Put output capacitor near to the inductor and the IC. Ground connections need to be tied to the IC ground
with a short copper trace connection or GND plane.
4. Route analog ground separately from power ground. Connect analog ground and connect power ground
separately. Connect analog ground and power ground together using thermal pad as the single ground
connection point. Or using a 0Ω resistor to tie analog ground to power ground.
5. Use single ground connection to tie charger power ground to charger analog ground. Just beneath the IC.
Use ground copper pour but avoid power pins to reduce inductive and capacitive noise coupling.
6. Decoupling capacitors should be placed next to the IC pins and make trace connection as short as possible.
7. It is critical that the exposed thermal pad on the backside of the IC package be soldered to the PCB ground.
Ensure that there are sufficient thermal vias directly under the IC, connecting to the ground plane on the
other layers.
8. The via size and number should be enough for a given current path.
See the EVM design for the recommended component placement with trace and via locations. For the WQFN
information, refer to SCBA017 and SLUA271.
Figure 48. High Frequency Current Path
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11.2 Layout Example
CPMID
PGND
Top layer
L
CBUS
PGND
CREGN CBTST
RBTST
2nd layer (PGND)
PGND
VBUS
CSYS
PIN1
via
VSYS
PGND
VBAT
PGND
PGND on
Top layer
CBAT
PGND
PGND
Figure 49. Layout Example
42
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12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
bq24298 EVM (PWR655) User’s Guide (SLUUB62)
Quad Flatpack No-Lead Logic Packages Application Report (SCBA017)
QFN/SON PCB Attachment Application Report (SLUA271)
12.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical packaging and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
BQ24298RTWR
ACTIVE
WQFN
RTW
24
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
BQ24298
BQ24298RTWT
ACTIVE
WQFN
RTW
24
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
BQ24298
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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