®
RT9460
Switch-Mode Single Cell Li-Ion Charger with USB-OTG
General Description
Features
The RT9460 is a switch-mode single cell Li-Ion/Li-Polymer
battery charger for portable applications. It integrates a
synchronous PWM controller, power MOSFETs, input
current sensing and regulation, and high accuracy voltage
regulation and charge termination circuits. Besides, the
charging current is regulated through the integrated
sensing resistors. The RT9460 also features USB OnThe-Go (OTG) support.
High Accuracy Voltage/Current Regulation
Average Input Current Regulation (AICR) : 0.1/0.15/
0.5/ to 3A per 0.1A
Minimum Input Voltage Regulation
For 5V Adaptor : 4V/4.25V/4.5V/4.75V
For 9V Adaptor : 7V/7.5V/8V/8.5V
For 12V Adaptor : 9.5V/10V/10.5V/11V
Charge Current Regulation Accuracy : ± 5%
Charge Voltage Regulation Accuracy : ± 1% ( 0 to
85°°C)
Integrated Power MOSFETS for up to 3.125A Charge
Rate
Support USB Charging Detection
Battery Temperature Sensing
Synchronous 0.75/1.5MHz Fixed Frequency PWM
Controller with up to 95% Duty Cycle
Reverse Leakage Protection to Prevent Battery
Drainage
Thermal Regulation and Protection
Over Temperature Protection
Input Over Voltage Protection
IRQ Output for Communication with I2C
Automatic Charging
RoHS Compliant and Halogen Free
The RT9460 optimizes the charging task by using a control
algorithm to vary the charge rate via different modes,
including pre-charge mode, fast charge mode, and constant
voltage mode. The key charge parameters are
programmable via the I2C interface. The RT9460 resumes
the charge cycle whenever the battery voltage falls below
an internal recharge threshold, and automatically enters
sleep mode when the input power supply is removed.
Other features include under-voltage protection, overvoltage protection, thermal regulation and reverse leakage
protection.
The RT9460 is available in the small WL-CSP-25B
2.52x2.52 and WQFN-32L 4x4 packages.
Applications
Cellular Telephones
Personal Information Appliances
Tablet PC, Power Bank
Portable Instruments
Simplified Application Circuit
RT9460
To Adaptor/USB
CIN
VIN
DP
DM
SCL
MID
LX
SYS
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
External Path
(Option)
CBAT
+
SDA
PGND
To System
CSYS
PPCTRL
BAT
CMID
L
VPTS
TS
RPULL
RNTC
Battery
Pack
is a registered trademark of Richtek Technology Corporation.
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1
RT9460
Ordering Information
Pin Configuration
RT9460
Package Type
WSC : WL-CSP-25B 2.52x2.52 (BSC)
QW : WQFN-32L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
(For WQFN-32L 4x4 Only)
Note :
Richtek products are :
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
A1
A2
A3
A4
A5
VIN
VIN
MID
IRQ
CEB
B3
B4
B1
B2
LX
LX
C1
C2
B5
BOOT OTG
C3
SCL
C4
C5
PGND PGND VDDP AGND SDA
D1
D2
D3
D4
D5
SYS
SYS
STAT
TS
DP
E2
E3
E4
E5
E1
BAT
BAT PPCTRL VPTS DM
WL-CSP-25B 2.52x2.52 (BSC)
Suitable for use in SnPb or Pb-free soldering processes.
LX
LX
LX
PGND
PGND
SYS
SYS
SYS
(TOP VIEW)
Marking Information
RT9460WSC
0E : Product Code
YMDNN : Date Code
1
24
2
23
3
4
5
6
7
22
PGND
33
8
21
20
19
18
17
BAT
BAT
BAT
BAT
NC
PPCTRL
STAT
VPTS
9 10 11 12 13 14 15 16
OTG
CEB
SCL
AGND
SDA
DP
DM
TS
0E YM
DNN
32 31 30 29 28 27 26 25
VIN
VIN
VIN
MID
BOOT
AGND
VDDP
IRQ
WQFN-32L 4x4
RT9460GQW
4F= : Product Code
4F=YM
DNN
YMDNN : Date Code
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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2
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Functional Pin Description
Pin No.
Pin Name
Pin Description
WL-CSP-25B
2.52x2.52 (BSC)
WQFN-32L
4x4
A1, A2
1, 2, 3
VIN
Power input.
A3
4
MID
Connection point between reverse blocking MOSFET and
high-side switching MOSFET.
A4
8
IRQ
IRQ output node.
A5
10
CEB
Enable control input. Low active.
B1, B2
30, 31, 32
LX
B3
5
BOOT
B4
9
OTG
Switch node. Connect to an external inductor.
Bootstrap supply for high-side MOSFET. Connect a capacitor
between BOOT and LX.
Setting input pin OTG boost mode.
B5
11
SCL
Clock input for I2C. Open-drain output. Connect a pull-up resistor.
C1, C2
28, 29
PGND
Power ground for switching charger.
C3
7
VDDP
Internal power for power stage.
C4
6, 12
AGND
Analog ground.
C5
13
SDA
Data input for I2C. Open drain output. Connect a pull-up Resistor.
D1, D2
25, 26, 27
SYS
System voltage regulator node.
D3
18
STAT
Charge status indicator (open drain).
D4
16
TS
Battery temperature detection pin.
D5
14
DP
USB charger type detection pin.
E1, E2
21, 22, 23, 24 BAT
Charging current output node. Battery charging voltage
regulation feedback pin with power path.
E3
19
PPCTRL
Power path control pin (connect to external P-MOSFET gate).
E4
17
VPTS
Supply voltage for battery temperature detection.
E5
15
DM
USB charger type detection pin.
--
20
NC
No internal connection.
--
33
PGND
(Exposed Pad)
Ground. The exposed pad must be soldered to a large PCB and
connected to PGND for maximum power dissipation.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
RT9460
Functional Block Diagram
VIN
TS VPTS
Battery
Temp.
Detection
Protection
VDDP
Analog Base
MID
BOOT
Switching Charger
Controller
LX
SCL
SDA
PGND
2
I C
State Machine
PP
Controller
OTG
IRQ DM DP CEB STAT
SYS
BAT
AGND
PPCTRL
Operation
The RT9460 is an integrated single cell Li-ion battery
switching charger with power path controller.
Base Circuits
Base circuits provide the internal power, VDDP and
reference voltage and bias current.
Protection Circuits
The protection circuits include the VINOVP, VINUVLO,
BATOVP and OTP circuits. The protection circuits turn
off the charging when the input power or die temperature
is in abnormal level.
Buck Regulator for charging and Boost Regulator
as OTG
The multi-loop controller controls the operation of charging
process and current supply to the system. It also controls
the circuits as a Boost converter for OTG applications.
Battery Detection
The RT9460 is capable of doing the battery absence
detection. The detection protects the charger when battery
is removed accidentally.
Adaptor Detection
If the poor input power source is connected to RT9460,
the operation is shut down by the adaptor detection.
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Power Path Management and Control
Once the battery voltage increase to a defined system
minimum regulation voltage, the internal path between
SYS and BAT will be fully turned on (Cool PPM operation).
That is, a better charging efficiency can be derived. When
end of charge occurs, the charing stops and the internal
path will be off.
USB Charger Detection
The RT9460 detects and distinguishes SONY, APPLE
NIKON and USB Charger (Standard Charger Port,
Charging Downstream Port and Dedicated Charger Port)
via DP and DM pins.
TS Detection
The RT9460 detects the temperature of the battery pack
via TS and VPTS pins. The VPTS pin provides a constant
voltage source used to drive the voltage divider composed
of a pulled-high resister and a NTC resister. The RT9460
reports the sensing results via IRQ and status bits for
COLD, COOL, WARM and HOT.
I2C Controller
The key parameters of charging and OTG are programmable
through I2C commands.
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------MID, BOOT ----------------------------------------------------------------------------------------------------------------LX ----------------------------------------------------------------------------------------------------------------------------MID − VIN, BOOT − LX -------------------------------------------------------------------------------------------------Other Pins -----------------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C
WL-CSP-25B 2.52x2.52 (BSC) ---------------------------------------------------------------------------------------WQFN-32L 4x4 -----------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2)
WL-CSP-25B 2.52x2.52 (BSC), θJA ---------------------------------------------------------------------------------WQFN-32L 4x4, θJA -----------------------------------------------------------------------------------------------------WQFN-32L 4x4, θJC -----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) -----------------------------------------------------------------------------Junction Temperature ---------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3)
HBM (Human Body Model) --------------------------------------------------------------------------------------------MM (Machine Model) -----------------------------------------------------------------------------------------------------
Recommended Operating Conditions
−0.3V to 28V
−0.3V to 28V
−0.3V to 20V
−0.3V to 6V
−0.3V to 6V
3.11W
3.59W
32.1°C/W
27.8°C/W
7°C/W
260°C
150°C
−65°C to 150°C
2kV
200V
(Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 4.3V to 12V
Junction Temperature Range ------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 5V, VBAT = 4.2V, L = 2.2μH, CIN = 2.2μF, CBATS = 10μF, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
VIN OVP Threshold Voltage
15
16
17
V
VIN OVP Hysteresis
--
200
--
mV
110
117
124
%
--
10
--
%
--
165
--
°C
--
10
--
°C
--
120
--
°C
--
2.4
--
V
Protection
Battery OVP
Battery OVP Hysteresis
Over-Temperature Protection
OTP
OTP Hysteresis
Thermal Regulation Threshold
System UVP Threshold
Voltage
Charge Current Begins To Reduce
VSYS_UVP
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
RT9460
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
2.5V < VBATx < VBATREG, VIN Falling
0
0.04
0.1
V
2.5V < VBATx < VBATREG
40
100
200
mV
VIN Rising Above VSLP + VSLPEXIT
--
128
--
ms
3.05
3.3
3.55
V
VIN Falling From UVLO
--
150
--
mV
PWM switching, ICHG = IBAT = 0mA
--
10
--
mA
PWM Is Not Switching.
ICHG = IBAT = 0mA
--
--
5
mA
High Impendence Mode
--
--
150
A
IBAT
VIN = 0V, charger off.
--
--
25
A
VMIVR
I2C Programmable refer to
Reg0x21[3:0]
4
--
11
V
5
--
5
%
USB Charge Mode, IAICR = 100mA
80
--
100
USB Charge Mode, IAICR = 500mA
400
--
500
USB Charge Mode, IAICR = 1A
800
--
1000
I2C Programmable Per 20mV.
3.5
--
4.62
V
0 to 85°C
1
--
1
%
VBATx Falling, Below VBATREG
--
125
--
mV
--
128
--
ms
I2C Programmable Per 0.1V
3.5
--
3.8
V
I2C Programmable Per 0.125A
1.25
--
3.125
A
5
--
5
%
2
--
3
V
5
--
5
%
100
--
850
mA
30
--
30
%
Sleep Mode Comparator
Sleep Mode Entry Threshold
VSLP
VIN VBATS
Sleep Mode Exit Hysteresis
VSLPEXIT
VIN VBATS
Sleep Mode Deglitch Time
TSLP
Under-Voltage Lockout Threshold
IC Active Threshold Voltage VUVLO
IC Active Hysteresis
VUVLO
VIN Rising
Input Currents
VIN Supply Current
Leakage Current from
Battery
IQ
Input Power Regulation
Input Voltage Regulation
VMIVR Accuracy
Average Input Current
Regulation Accuracy
IAICR
mA
Battery Voltage Regulation
Battery Voltage Regulation
VOREG
VBATREG Accuracy
Re-Charge Threshold
VRECH
Re-Charge Deglitch
TRECH
System Minimum Regulation Voltage
System Minimum
Regulation Voltage
VSYS
Charging Current Regulation
Output Charging Current
ICHG
ICHG Accuracy
Pre-Charge Threshold
VPREC
2
I C Programmable Per 0.2V
VPREC Accuracy
Pre-Charge Current
IPREC
I2C Programmable Per 50mA
IPREC Accuracy
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
100
--
450
mA
--
50
--
mA
100
--
100
mA
ICHG < IEOC, VBAT > VREC
--
2
--
ms
High-Side On-Resistance
From VIN to LX,
Exclude IAICR = 100mA
--
90
150
m
Low-Side On-Resistance
From LX to PGND
--
60
100
m
Charging Efficiency
VBATx = 4V, and ICHG = 2A,
--
85
--
%
I2C Programmable 0.75/1.5 MHz
--
1.5
--
MHz
10
--
10
%
--
95
--
%
0
--
--
%
--
4.5
--
A
From SYS to VBAT
--
35
60
m
To VIN
--
5.05
--
V
3
--
3
%
--
85
--
%
1
--
--
A
Peak Over-Current Protection
--
4.5
--
A
VIN OVP as OTG Boost
--
6
--
V
VIN OVP Hysteresis
Minimum Battery Voltage for
Boost
Minimum Battery Voltage
Hysteresis
--
250
--
mV
--
2.9
--
V
--
400
--
mV
--
--
0.4
V
1.3
--
--
--
--
0.4
--
--
400
Charge Termination Detection
End of Charge Current
IEOC
Fixed IEOC
I2C Programmable Per 50mA
As IAICR = 100mA
IEOC Accuracy
Deglitch Time for EOC
TEOC
PWM
Oscillator Frequency
OSC
Frequency Accuracy
Maximum Duty Cycle
At Minimum Voltage Input
Minimum Duty Cycle
Peak OCP as Charger Mode
ICHGOCP
Power Path On-Resistance
Boost Mode Operation
Output Voltage Level
VOTG
Output Voltage Accuracy
Efficiency
VBATx = 4V, and IIN = 0.8A,
2
MAX Output Current
I C Programmable, 0.5A/1A
VBATMIN
As Boost Start-Up
I2C Characteristics
Output Low Voltage
VOL
IDS = 10mA
Logic-High VIH
SCL, SDA Input
Threshold Voltage Logic-Low VIL
SCL Clock
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
V
kHz
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7
RT9460
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
0.5
0.6
0.7
V
200
--
--
A
50
100
150
A
DM pin, Switch Open
--
4.5
5
DP pin, Switch Open
--
4.5
5
DM pin, Switch Open
1
--
1
DP pin, Switch Open
1
--
1
DP DM Detection
D+ Voltage Source
D+ Voltage Source Output
Current
D- Current Sink
VDP_SCR
Input Capacitance
CI
Input leakage
II
DP Low Comparator Threshold
VDP_LOW
0.8
--
--
V
DM High Comparator Threshold
VDM_HIGH
0.8
--
--
V
DM Low Comparator Threshold
VDM_LOW
--
--
475
mV
%VPTS
IDM_SINK
pF
A
NTC Monitor
HOT Threshold
VVTS_HOT
VTS falling, the ratio of VPTS,
VIN > VIN(MIN)
29
30
31
WARM Threshold
VVTS_WARM
VTS falling, the ratio of VPTS,
VIN > VIN(MIN)
37
38
39
COOL Threshold
VVTS_COOL
VTS rising, the ratio of VPTS,
VIN > VIN(MIN)
55
56
57
%VPTS
COLD Threshold
VVTS_COLD
VTS rising, the ratio of VPTS,
VIN > VIN(MIN)
59
60
61
%VPTS
Low Temperature Hysteresis
VVTS
--
1
--
%VPTS
Disable Threshold
VVTS_OFF
TS function disable
2
3
4
%VPTS
VOL
IDS = 10mA
--
--
0.4
V
Logic-High VIH
1.3
--
--
Logic-Low VIL
--
--
0.4
%VPTS
Control I/O Pin
Output Low Voltage for STAT
CE Input Threshold
Voltage
V
Note 1. Stresses beyond those listed “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 in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Typical Application Circuit
RT9460
To Adaptor/USB
CIN
2.2µF
CVDDP
1µF
To USB Connector
2
To I C Bus
VIN
MID
BOOT
VDDP
DP
CBOOT
47nF
L
2.2µH
LX
SYS
External Path
(Option)
PPCTRL
SDA
IRQ
BAT
CBAT
10µF
STAT
OTG
CEB
VPTS
TS
To System
CSYS
22µF
DM
SCL
CMID
4.7µF
RPULL
+
RNTC
Battery
Pack
AGND PGND
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
9
RT9460
Typical Operating Characteristics
Charge Current vs. VBAT
Charge Current vs. VBAT
1.4
2.2
2.0
VIN =
VIN =
VIN =
VIN =
1.0
5V
5.5V
9V
12V
0.8
0.6
0.4
1.8
Charge Current (A)
Charge Current (A)
1.2
1.4
1.0
0.8
0.6
0.4
0.2
ICHRG = 1250mA, CV Max, no input current limit
ICHRG = 2000mA, CV Max, no input current limit
0.0
0.0
3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3
3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3
VBAT (V)
VBAT (V)
Efficiency vs. VBAT
95
90
90
85
VIN =
VIN =
VIN =
VIN =
80
5V
5.5V
9V
12V
75
Efficiency (%)
95
Efficiency vs. VBAT
85
VIN =
VIN =
VIN =
VIN =
80
75
5V
5.5V
9V
12V
70
70
ICHRG = 2000mA, CV Max, no input current limit
ICHRG = 1250mA, CV Max, no input current limit
65
65
3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3
3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3
VBAT (V)
VBAT (V)
Leakage Current vs. Battery Voltage
Supply Current vs. Input Voltage
100
14
90
12
Supply Current (μA) 1
Leakage Current (μA)1
5V
5.5V
9V
12V
1.2
0.2
Efficiency %)
VIN =
VIN =
VIN =
VIN =
1.6
10
8
6
4
2
VBAT high to low
0
2
2.2 2.4 2.6 2.8
3
3.2 3.4 3.6 3.8
4
4.2 4.4
Battery Voltage (V)
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10
80
Hz_VBAT = 3.8V
Hz_VBAT = 2.6V
70
60
50
40
30
20
10
High Impendence Mode
0
4
5
6
7
8
9
10
11
12
13
14
15
Input Voltage (V)
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Input Voltage vs. Load Current
Efficiency vs. Load Current
100
5.10
90
5.09
Efficiency (%)
80
70
60
50
4.2V
3.9V
3.6V
3.3V
3V
5.08
Input Voltage (V)
VBAT =
VBAT =
VBAT =
VBAT =
VBAT =
40
30
20
5.06
5.05
VBAT =
VBAT =
VBAT =
VBAT =
VBAT =
5.04
5.03
5.02
10
Boost Mode, CV = 5.05V
0
0
0.2
0.4
0.6
0.8
Load Current (A)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
5.07
December 2016
1
5.01
3V
3.3V
3.6V
3.9V
4.2V
Boost Mode, CV = 5.05V
5.00
0
0.2
0.4
0.6
0.8
1
Load Current (A)
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11
RT9460
Applications Information
The RT9460 switching charger integrates a synchronous
PWM controller with power MOSFETs to provide input
voltage MIVR (Minimum Input Voltage Regulation), input
current AICR (Active Input Current Regulation), high
accuracy current and voltage regulation, and charge
termination. The charger also features USB OTG (On-TheGo).
The RT9460 has three operation modes : charge mode,
boost mode (USB OTG), and high impedance mode. In
charge mode, the RT9460 supports a precision charging
system for single cell. In boost mode, the RT9460 works
as the boost converter and boosts the voltage from battery
to VIN pin for sourcing the OTG devices. In high impedance
mode, the RT9460 stops charging or boosting and
operates in a mode with low current from VIN or battery to
reduce the power consumption when the portable device
is in standby mode.
Notice that the RT9460 integrate input power source (AC
adapter or USB input) detection. Thus, the RT9460 can
automatically set the charge current by option. The charge
current needs to be set via I2C interface by the host. The
RT9460 application mechanism and I2C compatible
interface are introduced in later sections.
Charge Mode Operation
Minimum Input Voltage Regulation (MIVR)
The RT9460 features input voltage MIVR function to prevent
input voltage drop due to insufficient current provided by
the adaptor or USB input. If MIVR function is enabled, the
input voltage decreases when the over current of the input
power source occurs. VIN is regulated at a predetermined
voltage level which can be set as 4V to 11V by I2C interface.
At this time, the current drawn by the RT9460 equals to
the maximum current value that the input power can provide
at the predetermined voltage level, instead of the set value.
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12
Charge Profile
The RT9460 provides a precision Li-ion or Li-polymer
charging solution for single-cell applications. Input current
limit, charge current, termination current, charge voltage
and input voltage MIVR are all programmable via the I2C
interface. In charge mode, the RT9460 has five control loops
to regulate input current (AICR), charge current, charge
voltage, input voltage (MIVR) and device junction
temperature. During the charging process, all five loops (if
MIVR is enabled) are enabled and the dominant one will
take over the control.
For normal charging process, the Li-ion or Li-polymer
battery is charged in three charging modes depending on
the battery voltage. At the beginning of the charging
process, the RT9460 is in pre-charge mode. When the
battery voltage rises above pre-charge threshold voltage
(VPREC), the RT9460 enters fast-charge mode. Once the
battery voltage is close to the regulation voltage (VOREG),
the RT9460 enters constant voltage mode.
Pre-Charge Mode
For life-cycle consideration, the battery can not be
charged with large current under low battery condition.
When the BATS pin voltage is below pre-charge threshold
voltage (VPREC), the charger is in pre-charge mode with a
weak charge current witch equals to the pre-charge current
(IPREC). There are two control loops in Pre-charge mode.
One is the ICC and the other is the MIN_SYS. If the battery
voltage is lower than the SYS voltage, the MOSFET won't
fully turn-on to prevent the battery voltage to influence the
SYS voltage. It features that the charger can also provide
the current to the load from SYS even the battery voltage
is too low. In pre-charge mode, the charger basically works
as an LDO. The pre-charge current also acts as the current
limit when the BATS pin is shorted. The Pre-Charge current
levels are 100mA - 850mA programmed by I2C.
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Fast-Charge Mode and Settings
As the BAT pin rises above VPREC, the charger enters
fast-charge mode and starts charging. Notice that the
MUIC integrates input power source (AC adapter or USB
input) detection. Thus, the switching charger can set the
charge current by option automatically. Unlike the linear
charger (LDO), the switching charger (Buck converter) is
a current amplifier. The current drawn by the switching
charger is different from the current into the battery.
The user can set the Average Input Current Regulation
(AICR) and output charge current (ICHRG) respectively.
Cycle-by-Cycle Current Limit
The charger of the RT9460 has an embedded cycle-bycycle current limit for inductor. Once the inductor current
touches the threshold (4.5A typ.), the charger stops
charging immediately to prevent over current from
damaging the device. Notice that, the mechanism can not
be disabled by any way.
Average Input Current Regulation (AICR)
The AICR setting is controlled by I2C. The AICR100 mode
limits the input current to 100mA. The AICR500 mode
limits the input current to 500mA. If the application does
not need input current limit, it can be disabled also. The
AICR levels programmed by I2C and suitable for USB port
and several TA types.
Charge Current (ICHG)
The charge current into the battery is determined by the
power path sensing RON and ICC setting by I2C. The
voltage between the SYS and BAT pins is regulated to
the voltage control by ICC setting. (ICC x RON, RON : power
path RON)
At RT9460, the RON is 35mΩ and the Fast-Charge currents
is set by the I2C interface from 1.25A to 3.125A per
125mA.
Constant Voltage Mode and Settings
The RT9460 enters constant voltage mode when the BATS
voltage is close to the output-charge voltage (VOREG). In
this mode, the charge current begins to decrease. For
default settings (charge current termination is disabled),
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
the RT9460 does not turn off and always regulates the
battery voltage at VOREG. However, once the charge
current termination is enabled, the charger terminates if
the charge current is below termination current (IEOC) in
constant-voltage mode. The charge current termination
function is controlled by the I2C interface.
After termination, a new charge cycle restarts when one
of the following conditions is detected :
The BATS pin voltage falls below the VOREG - VRECH
threshold.
VIN Power On Reset (POR).
CHG_EN bit toggle or RST bit is set (via I2C interface).
Output Charge Voltage (VOREG)
The output-charge voltage is set by the I2C interface from
3.5V to 4.62V per 25mV. The default value is 4V (011001).
Termination Current (IEOC)
If the charger current termination is enabled (TE bit = “1”
of REG0x01[3]), the end-of-charge current is determined
by both termination current sense voltage (VEOC) and power
path sense resistor (RON). General RON is 35mΩ, IEOC is
set by the I2C interface from 100mA to 450mA per 50mA.
Input Voltage Protection in Charge Mode
During charge mode, there are two protection mechanisms
against if input power source capability is less than the
charging current setting. One is AICR and the other is
minimum input voltage regulation. A suitable level of AICR
can prevent VBUS drop by the insufficient capability. As
the AICR setting is not suitable, MIVR will regulate the
VBUS in the setting level and sink the maximum current
of power source.
Sleep Mode (VIN - VBATS < VSLP)
The RT9460 enters sleep mode if the voltage drop between
the VIN and BATS pins falls below VSLP. In sleep mode,
the reverse blocking switch and PWM are all turned off.
This function prevents battery drain during poor or no input
power source.
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13
RT9460
Input Over Voltage Protection
When VBUS rises above the input over voltage threshold,
the switching charger stops charging and sets the fault
status bits. The condition is released when VBUS falls
below OVP threshold. The switching charger then
resumes charging operation.
Boost Mode Operation (OTG)
Trigger and Operation
The RT9460 features USB OTG support. When OTG
function is enabled, the synchronous boost control loop
takes over the power MOSFETs and reverses the power
flow from the battery to the VIN pin. In normal boost mode,
the VIN pin is regulated to the level controlled by
VOREG[5:0] from 4.425V to 5.825 per 25mV. The boost
provides up to 1A current to support other OTG devices
connected to the USB connector.
Output Over Voltage Protection
In boost mode, the output over voltage protection is
triggered when the VIN voltage is above the output OVP
threshold. When OVP occurs, the boost converter stops
switching and turns off immediately.
the RT9460 checks the BATS voltage. If it is still above
the recharge threshold, the battery is present and charge
done is detected. If the BATS voltage is below the recharge
threshold, the battery is absent. Thus, the RT9460 stops
charging and the charge parameters are reset to the
default values. The charge resumes after a period of tDET
(2sec. typ.).
JEITA Protection
To enhance thermal protection of battery, JEITA function
is implemented in RT9460. JEITA guideline was released
in 2007. It includes Warm and cool protection (cool section
is between T1 and T2; warm section is between T3 and
T4, see the figure as below). When battery's temperature
is in warm or cool section, RT9460 will reduce charging
current (by a half of CC mode current). RT9460 stop
charging if temperature is lower than T1 or is higher than
T4.
Charge Current
CC
CC/2
Cold
Output Overload Protection
The RT9460 provides an overload protection to prevent the
device and battery from damage when VIN is overload.
Once overload condition is detected, the reverse blocking
switch operates in linear region to limit the output current
while the MID voltage remains in voltage regulation. If the
overload condition lasts for more than 32ms, the RT9460
will recognize the overload fault condition and resets
registers to the default settings.
Cool
T1
Normal
T2
Warm
T3
VTS High
Hot
T4
TEMP.
VTS Low
Thermal of battery can be monitored by TS PIN. There
are 4 sections should be implemented in JEITA function.
Base on Rhot and Rcold, RT1 and RT2 can be determined
by equation (1) and equation (2).
(Rhot mean that system trigger battery OTP, Rcold mean
that system trigger battery low temperature protection.)
Battery Detection During Normal Charging
RT1 = VPTS x [ (1/ VT1 - 1/ VT4)/(1 / RCold - 1 / RHot)]
(1)
The RT9460 provides a battery absent detection scheme
to detect insertion or removal of the battery pack. The
battery detection scheme is valid only when both TE = 1
and BATD_EN = 1.
RT2 = RT1 x [ 1 / (VPTS / VT1 - RT1 / RCold - 1)]
(2)
During normal charging process, once the charge done
condition is satisfied (VBATS > VOREG - VRECH and
termination current is detected), the RT9460 turns off the
PWM converter and initiates a discharge current
(detection current) for a detection time period. After that,
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14
VPTS
RT1
VTS
RT2
RTH
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Thermal Considerations
PD(MAX) = (TJ(MAX) − TA) / θJA
where TJ(MAX) is the maximum junction temperature, TA is
the ambient temperature, and θJA is the junction to ambient
thermal resistance.
For recommended operating condition specifications, the
maximum junction temperature is 125°C. The junction to
ambient thermal resistance, θJA, is layout dependent. For
WL-CSP-25B 2.52x2.52 package, the thermal resistance,
θJA, is 32.1°C/W on a standard JEDEC 51-7 four-layer
thermal test board. For WQFN-32L 4x4 package, the
thermal resistance, θJA, is 27.8°C/W on a standard JEDEC
51-7 four-layer thermal test board. The maximum power
dissipation at TA = 25°C can be calculated by the following
formula :
PD(MAX) = (125°C − 25°C) / (32.1°C/W) = 3.11W for
WL-CSP-25B 2.52x2.52 package
PD(MAX) = (125°C − 25°C) / (27.8°C/W) = 3.59W for
WQFN-32L 4x4 package
The maximum power dissipation depends on the operating
ambient temperature for fixed T J(MAX) and thermal
resistance, θJA. The derating curve in Figure 1 allows the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
4.0
Maximum Power Dissipation (W)1
For continuous operation, do not exceed absolute
maximum junction temperature. The maximum power
dissipation depends on the thermal resistance of the IC
package, PCB layout, rate of surrounding airflow, and
difference between junction and ambient temperature. The
maximum power dissipation can be calculated by the
following formula :
Four-Layer PCB
3.6
3.2
2.8
2.4
WQFN-32L 4x4
2.0
1.6
WL-CSP-25B 2.52x2.52
1.2
0.8
0.4
0.0
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 1. Derating Curve of Maximum Power Dissipation
Layout Considerations
For
AGND noise reduction, PGND and AGND should
connect directly at top layer.
For AGND noise reduction, PGND and AGND should be
connected by ground plane at inner layer1. And this
ground plane should be connected to system ground
plane by via.
VBUS and VMID (capacitor GND) should be connected
to IC PGND directly at top layer.
The
output inductor and bootstrap capacitor should be
placed close to the RT9460 and LX pins.
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15
RT9460
TOP Layer
Adaptor
Input
Inner Layer1
Inner Layer2
0603C
Bottom Layer
0603C
0402C
2
3
4
5
PGND A
VIN
VIN
MID
IRQ
CEB
B
LX
LX
BOOT
OTG
SCL
C
PGND
PGND
VDDP
AGND
SDA
D
SYS
SYS
STAT
TS
DP
E
BAT
BAT
PPCT
RL
VPTS
DM
2520L
1
TO SYS
0603C
0603C
BAT
PGND
Figure 2. PCB Layout Guide
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is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Control Register (Control)
I2C Slave Address : 0100101
Address
Name
Bit7
Bit6
Device ID
0x03
0x00
0x04
0x1C
0x08
0x09
Bit0
CHIP_REV
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Control1
Sel_
SWFreq
EN_
STAT
BOOST
PWR_
Rdy
OTG_
PinP
MIVR
STAT
Reset Value
0
1
0
0
0
0
0
0
Read/Write
R/W
R/W
R
R
R
R
R
R
Higher_
OCP
TE
IIN_INT
HZ
OPA_
MODE
IEOC[2:0]
Reset Value
0
1
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
OTG_PL
OTG_EN
VOREG[5:0]
Reset Value
0
1
1
0
0
1
1
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Control4
RST
Reserved
Reserved
Reserved
Reserved
Reset Value
1
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SYSUVP_
OTG_OC
HW_SEL
Reserved Reserved
SYS_Min[1:0]
Reserved
IPREC[3:0]
Reset Value
1
0
0
1
0
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
ICHRG[3:0]
EN_OSCSS
VPREC[2:0]
Reset Value
0
0
0
0
0
0
1
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TS_COOL
TS_COLD
Control7
0x07
Bit1
1
Control6
0x06
Bit2
0
Control5
0x05
Bit3
Reset Value
Control3
0x02
Bit4
VENDOR_ID
Control2
0x01
Bit5
CC_JEITA BATD_EN
Chip_EN
CHG_EN
TS_HOT
TS_
WARM
Reset Value
0
0
1
1
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Control8
Reserved
Reserved
Reserved
Reserved
Reserved
PPSenseNode [2:0]
Reset Value
1
0
0
1
1
1
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
IRQ1
TSDI
VINOVPI
WakeUpI
WatchDogI
Reserved
Reset Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
IRQ2
CHRVPI
CHBADI
CHBATOVI
CHTERMI
CHRCHGI
CHTMRI
Reset Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
CHTERM_
SYSUVP
TMRI
BATAB
CHTREGI SYSWAKEUPI
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
17
RT9460
Address
0x0A
0x0B
0x0C
0x0D
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
IRQ3
BSTVINOVI
BSTOLI
BSTLOWVI
Reserved
Reserved
Reserved
Reserved
Reserved
Reset Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
0x21
0x22
TSDIM
Reset Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Mask 2
CHRVPIM
CHBADIM
Reset Value
0
0
Read/Write
R/W
Mask 3
BSTVINOV
IM
Reset Value
Read/Write
0x25
CHBATOV
CHTREGI SYSWAKE
CHTERMIM CHRCHGIM CHTMRIM
IM
M
UPIM
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BSTOLIM
BSTLOW
VIM
Reserved
Reserved
Reserved
Reserved
Reserved
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
CHG_TYP[2:0]
IINLMTSEL[1:0]
R/W
R/W
R/W
CHG_
2DET
CHG_
1DET
CHGRUN
Reset Value
0
0
0
1
0
1
1
0
Read/Write
R
R
R
R/W
R/W
R/W
R/W
R
Control 9
Reserved
PPC_
CTRL_SEL
EN_
PPCTRL
MIVR_
ENB
Reset
Value
0
1
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
MIVR_LVL[3:0]
WT_FC[2:0]
0
R/W
TMR_
Pause
Control 10
CLR_DP
DP_STAT
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
WT_PRC[1:0]
AICR[4:0]
DeadBAT_LVL[2:0]
Reset
Value
0
0
1
0
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
WK_
Timer_EN
IRQ_
Pulse
IRQ_REZ
Control 12
0x24
BATABM
0
Control 11
0x23
Reserved
CHTERM_ SYSUVP
TMRIM
IM
Mask 1
Control-DP
DM
0x0E
VINOVPIM WakeUpIM
WatchDog
IM
EOC_Timer[1:0]
WakeUp_Timer[2:0]
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Control 13
WDT_EN
Reserved
Reserved
TWDTRST
Reserved
Reserved
Reset
Value
0
0
0
1
0
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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18
TWDT[1:0]
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
STAT IRQ
TSHOTI
TSWARMI
TSCOOLI
TSCOLDI
PWR_RdyI
MIVRI
Reserved
Reserved
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TSHOTIM
TSWARMIM
TSCOOLI
M
TSCOLDI
M
PWR_
RdyIM
MIVRIM
Reserved
Reserved
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0x26
STAT IRQ
Mask
Reset
Value
0x27
Read/Write
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
19
RT9460
Address
Name
Bit7
Bit6
Control 1
Sel_
SWFreq
EN_
STAT
Reset
Value
0
1
0
Read/Write
R/W
R/W
R
0x00
Sel_SWFreq
EN_STAT
STAT
BOOST
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
BOOST
PWR_
Rdy
OTG_
Pinp
MIVR
0
0
0
0
0
R
R
R
R
R
STAT
The switching frequency selection bit (Charger/OTG)
0 : The switching frequency is 1.5MHz
1 : The switching frequency is 750kHz
0 : Disable STAT pin function
1 : Enable STAT pin function
Charger status bit
00 : Ready
01 : Charge in progress
10 : Charge done
11 : Fault
0 : Not in boost mode
1 : Boost mode
PWR_Rdy
Power status bit
0 : Input power is bad, VIN > VOVP or VIN < VUVLO or VIN < BATS + VSLP
1 : Input power is good, UVLO < VIN < VOVP & VIN > BATS + VSLP
OTG_PinP
OTG pin polarity
0 : OTG input pin is low
1 : OTG input pin is high
MIVR
MIVR status pin :
0 : MIVR regulation is inactive
1 : MIVR regulation is active
Control 2
0x01
IEOC[2:0]
Higher_
OCP
TE
IIN_INT
HZ
OPA_
MODE
Reset
Value
0
1
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
IEOC
Higher_OCP
TE
EOC current level setting
000 : 100mA
001 : 150mA
010 : 200mA
011 : 250mA
100 : 300mA
101 : 350mA
110 : 400mA
111 : 450mA
Charger/OTG OCP level selection
0 : OCP = 4.5A
1 : OCP = 6A
Charge current termination detection and IRQ control
0 : Disable charge current termination
1 : Enable charge current termination
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
Name
IIN_INT
HZ
OPA_MODE
Bit7
Bit6
Bit3
Bit2
Bit1
Bit0
0 : Not high impedance mode
1 : High impedance mode
0 : Charger mode
1 : Boost mode
VOREG[5:0]
OTG_PL
OTG_EN
Reset
Value
0
1
1
0
0
1
1
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
VOREG[5:0]
Battery regulation voltage / Boost output voltage.
00 0000 : 3.50V / 4.425V
00 0001 : 3.52V / 4.45V
00 0010 : 3.54V / 4.475V
......
01 1000 : 3.98V / 5.025 V
01 1001 : 4.00V / 5.05V
01 1010 : 4.02 / 5.075V
......
10 0111 : 4.28V / 5.4V
10 1000 : 4.30V / 5.425V
10 1001 : 4.32V / 5.45V
......
10 1110 : 4.42V / 5.575V
10 1111 : 4.44V / 5.6V
......
11 0110 : 4.58V / 5.775V
11 0111 : 4.60V / 5.8V
11 1000 : 4.62V / 5.825V
......
11 1111 : 4.62V / 5.825V
OTG_PL
0 : Active at low level
1 : Active at High level
OTG_EN
0 : Disable OTG Pin
1 : Enable OTG Pin
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
Bit4
IAICR setting bit
0 : Decided by external OTG pin, 500mA current limit when OTG pin is low and 1A current
limit when OTG pin is high
2
1 : Decided by I C IAICR[4:0] and DPDM results, refer to REG0x0E
Control 3
0x02
Bit5
December 2016
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RT9460
Address
Name
Bit7
Bit6
Device ID
Bit4
Bit3
VENDOR_ID
Bit2
Bit1
Bit0
CHIP_REV
Reset
Value
0
1
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
0x03
VENDOR_ID
CHIP_REV
Vendor Identification : Richtek : 0100b
Chip Revision
Control 4
RST
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0x04
RST
Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Write : 1-Charger in reset mode, 0-No effect, Read : always get "0"
Control 5
0x05
Bit5
SYSUVP_
OTG_OC
HW_SEL
SYS_Min[1:0]
IPREC[3:0]
Reset
Value
1
0
0
1
0
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SYSUVP_HW_SEL
OTG_OC
SYS_Min[1:0]
IPREC[3:0]
System UV protection selection bit
0 : Switching is not turned off when System UVP
1 : Switching is turned off when System UVP
Over current protection threshold
0 : 0.5A
1 : 1A
System minimum regulation voltage
00 : 3.5V
01 : 3.6V
10 : 3.7V
11 : 3.8V
0000 : 100mA
0001 : 150mA
0010 : 200mA
0011 : 250mA
0100 : 300mA
0101 : 350mA
0110 : 400mA
0111 : 450mA
1000 : 500mA
1001 : 550mA
1010 : 600mA
1011 : 650mA
1100 : 700mA
1101 : 750mA
1110 : 800mA
1111 : 850mA
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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22
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
Name
Bit7
Control 6
0x06
Bit5
Bit4
Bit2
EN_OSC
SS
ICHRG[3:0]
Bit1
Bit0
VPREC[2:0]
0
0
0
0
0
0
1
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
EN_OSCSS
VPREC[2:0]
Charging current setting (Recommed to set REG0x1C [2:0] = 111)
0000 : 1.25A
0001 : 1.375A
0010 : 1.5A
……
0110 : 2A
……
1010 : 2.5A
……
1110 : 3A
1111 : 3.125A
Enable signal of oscillator spread spectrum
0 : Disable spread spectrum
1 : Enable spread spectrum
Pre-Charge voltage threshold
000 : 2V
001 : 2.2V
010 : 2.4V
011 : 2.6V
100 : 2.8V
101 : 3.0V
…...
111 : 3.0V
Control 7
CC_
JEITA
BATD_
CHG_
CHIP_EN
EN
EN
Reset
Value
0
0
1
Read/Write
R/W
R/W
R/W
TS_HOT
TS_WARM
TS_
COOL
TS_COLD
1
0
0
0
0
R/W
R
R
R
R
CC_JEITA
Charging current setting bit
0 : ICHRG
1 : ICHRG/2
BATD_EN
Battery detection when charge done
0 : Disable battery detection
1 : Enable battery detection
CHIP_EN
Chip enable bit
0 : Chip is disabled
1 : Chip is enabled
CHG_EN
Charger enable bit :
0 : Charger is disabled
1 : Charger is enabled
TS_HOIT
Temperature status read bit
0 : Normal temperature
1 : Temperature is hot
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
Bit3
Reset
Value
ICHRG[3:0]
0x07
Bit6
December 2016
is a registered trademark of Richtek Technology Corporation.
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23
RT9460
Address
Name
Bit7
Bit6
Bit5
TS_WARM
Temperature status read bit
0 : Normal temperature
1 : Temperature is warm
TS_COOL
Temperature status read bit
0 : Normal temperature
1 : Temperature is cool
TS_COLD
Temperature status read bit
0 : Normal temperature
1 : Temperature is cold
0x1C
Bit3
Bit2
Bit1
Bit0
Control 8
Reserved
Reserved
Reserved
Reserved
Reserved
Reset
Value
1
0
0
1
1
1
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PPSenseNode [2:0]
0x08
Bit4
PPSenseNode [2:0]
Power path current sensing adjustment
100 : default setting
……
111 : recommended setting
TSDI
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
TSDI
VINOVPI WakeUpI WatchDogI Reserved
CHTERM_ SYSU
TMRI
VPI
IRQ 1
Thermal shutdown fault. Set if the die temperature exceeds the thermal shutdown
threshold
VINOVPI
VIN over voltage protection
0 : Normal
1 : VINOVP is detected
WakeUpI
WakeUp timer fault
0 : Normal
1 : WakeUp timer is expired
WatchDogI
WatchDog timer fault
0 : Normal
1 : WatchDog timer is expired
CHTERM_TMRI
EOC timer fault
0 : Normal
1 : EOC timer is expired
SYSUVPI
System UVP fault
0 : Normal
1 : SYSUVP is triggered
BATABI
Battery absence fault bit
0 : Normal
1 : Battery absence
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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24
BATABI
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
0x09
Name
Bit7
Bit6
Bit5
Bit4
IRQ 2
CHRVPI
CHBADI
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
CHBATO CHTERM
VI
I
Bit3
CHRCH
GI
Bit2
CHTMRI CHTREGI
CHRVPI
Charger fault. Reverse protection (VIN < BATS + VSLP)
CHBADI
Charger fault. Bad adaptor (Poor Input source or VIN < VUVLO)
CHBATOVI
Charger fault. Battery OVP
CHTERMI
Charge terminated
CHRCHGI
Recharge request (VBATS < VOREG – VRECH)
CHTMRI
Charger fault. Timer time-out
CHTREGI
Charger warning. Thermal regulation loop active
SYSWAKEUPI
Battery voltage is high enough to wakeup system
0x0A
SYSWAK
EUPI
BSTVINO
VI
BSTOLI
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
BSTOLI
BSTLOWVI
BSTLOW
Reserved Reserved Reserved Reserved Reserved
VI
Boost fault. VIN OVP (VIN > VIN_BOVP)
Boost fault. Over load
Boost fault. Battery voltage is too low
CHTERM SYSUVP
WatchDo
BATABIM
Reserved
_TMRIM
IM
gIM
Mask 1
TSDIM
VINOVP
IM
WakeUpI
M
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TSDIM
TSDI fault interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
VINOVPIM
VIN OVP fault interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
WakeUpIM
WakeUp timer interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
WatchDogIM
CHTERM_TMRIM
WatchDog timer interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
EOC timer interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
Bit0
IRQ 3
BSTVINOVI
0x0B
Bit1
December 2016
is a registered trademark of Richtek Technology Corporation.
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25
RT9460
Address
Name
SYSUVPIM
BATABIM
0x0C
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
System UVP fault interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Battery absence fault interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Mask 2
CHRVP
IM
CHBAD
IM
CHBATO CHTERM
VIM
IM
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
CHRVPIM
Charger reverse protection interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
CHBADIM
Charger Bad adaptor interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
CHBATOVIM
Charger battery over voltage interrupt mask
0 : Interrupt is not masked,
1 : Interrupt is masked
CHTERMIM
Charge terminated interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
CHRCHGIM
Charger recharge request interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
CHRCH
GIM
CHTMRIM
Charger timer timeout interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
CHTREGIM
Charger thermal regulation loop active interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
SYSWAKEUPIM
System wakeup interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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26
CHTMRI CHTREG SYSWAK
M
IM
EUPIM
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
0x0D
Name
Bit7
Bit6
Mask 3
BSTVINO
VIM
BSTOLI
M
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
CHG_
2DET
CHG_
1DET
CHGRUN
BSTVINOVIM
BSTOLIM
BSTLOWVIM
Bit4
Bit3
Bit2
Bit1
Bit0
BSTLOW
Reserved Reserved Reserved Reserved Reserved
VIM
Boost VIN overvoltage interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Boost over load interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Boost low battery voltage interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Control
DPDM
0x0E
Bit5
CHG_TYP[2:0]
IINLMTSEL[1:0]
Reset
Value
0
0
0
1
0
1
1
0
Read/Write
R
R
R
R/W
R/W
R/W
R/W
R
CHG_TYP[2:0]
Charger type indication
000 : Standard USB Charger (SDP)
001 : Sony Charger -1
010 : Sony Charger -2
011 : Apple Charger (0.5A)
100 : Apple Charger (1A)
101 : Nikon Charger (1A)
110 : Charging Downstream Port (CDP) (High Current Host/Hub)
111 : Dedicated Charger (DCP)
IINLMTSEL[1:0]
Input current limit selection bit
00 : CHG_TYP[2:0] is applied and ignore IAICR[4:0]
01 : IAICR[4:0] is applied and ignore CHG_TYP[2:0]
10 : Input limit is set to the higher level of IAICR[4:0] and CHG_TYP[2:0] results
11 : Input limit is set to the lower level of IAICR[4:0] and CHG_TYP[2:0] results
CHG_2DET
The CHG_2DET bit is used to enable the secondary charger detection (to distinguish CDP
and DCP). Set this bit to 1 in order to enable charger detection.
0 : Secondary Charger Detection is disabled
1 : Secondary Charger Detection is enabled
CHG_1DET
The CHG_1DET bit is used to enable the primary charger detection and auto-detect
charger type when VIN plug in. Toggle this bit value (set to 0 and then set 1) to re-enable
charger detection.
0 : Primary Charger Detection is disabled
1 : Primary Charger Detection is enabled
CHGRUN
The CHGRUN bit is the charger detector status bit. It means the charger detection is
running or not.
0 : Charger Detection is not running
1 : Charger Detection is running
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
27
RT9460
Address
0x21
Name
Bit7
Control 9
Reserved
Reset
Value
0
1
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PPC_CTRL_SEL
EN_PPCTRL
MIVR_ENB
MIVR_LVL[3:0]
Bit6
PPC_
EN_
CTRL_SEL PPCTRL
Bit4
Bit3
MIVR_
ENB
Bit2
Bit1
Bit0
MIVR_LVL[3:0]
Pin-PPCTRL control by Software (SW) or Hardware (HW)
0 : Controlled by SW
1 : Controlled by HW
External power-path control signal. It works when PPC_CTRL_SEL = 0
0: PPCTRL pin Internally pulled high to VSYS
1: PPCTRL pin Internally pulled low to PGND
Control the MIVR regulation
0 : MIVR regulation is enabled
1 : MIVR regulation is disabled
Control the MIVR regulation level
0000 : 4.0V
0001 : 4.25V
0010 : 4.5V
0011 : 4.75V
0100 : 7.0V
0101 : 7.5V
0110 : 8.0V
0111 : 8.5V
1000 : 9.5V
1001 : 10V
1010 : 10.5V
1011 : 11V
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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28
Bit5
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
0x22
Name
Bit7
Bit6
Control 10
CLR_DP
DP_
STAT
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
CLR_DP
DP_STAT
WT_FC[2:0]
WT_PRC[1:0]
TMR_Pause
Bit5
Bit3
WT_FC[2:0]
Bit2
Bit1
Bit0
TMR_
Pause
WT_PRC[1:0]
Clear DP pin of 0.6V voltage source
0 : Don't care
1 : Release DP pin of 0.6V voltage source
DP pin status indication
0 : DP pin is pulled to 0.6V
1 : DP pin is released
Fast charge timer
000 : 4hrs
001 : 6hrs
010 : 8hrs
011 : 10hrs
100 : 12hrs
101 : 14hrs
110 : 16hrs
111 : Timer disabled
Pre charge timer
00 : 30min
01 : 45min
10 : 60min
11 : Timer disabled
Timer control bit
0 : Timer is active
1 : Timer is paused
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
Bit4
December 2016
is a registered trademark of Richtek Technology Corporation.
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29
RT9460
Address
Name
Bit7
Bit6
Control 11
0x23
Bit5
Bit4
Bit3
Bit2
IAICR[4:0]
Bit1
Bit0
DeadBAT_LVL[2:0]
Reset
Value
0
0
1
0
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
IAICR[4:0]
DeadBAT_LVL[2:0]
Average Input Current Regulation (AICR) setting
0000X : 100mA
0001X : 150mA
0010X : 500mA
00110 : 600mA
00111 : 700mA
…...
01010 : 1A
01011 : 1.1A
…...
01111 : 1.5A
…...
10100 : 2A
…...
11110 : 3A
11111 : Disable
Dead battery voltage level
000 : 2.9V
001 : 3.0V
010 : 3.1V
011 : 3.2V
100 : 3.3V
101 : 3.4V
110 : 3.5V
111 : 3.6V
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Address
Name
Bit7
Control 12
0x24
Bit6
Bit5
EOC_Timer[1:0]
Bit4
Bit3
Wake-up Timer[2:0]
Bit2
Bit1
Bit0
WK_
Timer_EN
IRQ_
Pulse
IRQ_
REZ
Reset
Value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
EOC_Timer[1:0]
Wake-up Timer[2:0]
WK_Timer_EN
The timer of back-charging time
00 : 0 min
01 : 30 min
10 : 45 min
11 : 60min
The periodically timer IRQ to awake
000 : 4s
001 : 8s
010 : 16s
011 : 32s
100 : 64s
101 : 2min
110 : 4min
111 : 8min
Control the wake-up timer
0 : Timer is disabled
1 : Timer is enabled
IRQ_Pulse
Control the IRQ remind function
0 : The IRQ reminding is disabled
1 : The IRQ reminding is enabled. If the IRQ is triggered and no check action, it will be
released for 2ms and triggered again
IRQ_REZ
IRQ release control
0 : No action
1 : Release IRQ pin status. It is auto reset to 0 when release is done
0x25
TWD
Reserved Reserved
TRST
Control 13
WDT_EN
Reserved
Reserved
Reset
Value
0
0
0
1
0
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
WDT_EN
TWDT[1:0]
Control watch dog timer
0 : Disable timer and reset
1 : Enable timer
2
TWDTRST
Waiting timer to reset I C setup after watchdog is asserted
0 : 200ms
1 : 500ms
TWDT[1:0]
Watch dog timer, from WDTEN is enabled to watchdog IRQ
00 : 1s
01 : 2s
10 : 4s
11 : 8s
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
31
RT9460
Address
0x26
Name
Bit7
Bit6
STAT IRQ
TSHOTI
TSWARMI
Reset
Value
0
0
0
Read/Write
R
R
R
TSHOTI
Bit5
Bit4
Bit3
Bit2
PWR_
RdyI
MIVRI
0
0
0
0
0
R
R
R
R
R
TSCOO TSCOL
LI
DI
Bit1
Bit0
Reserved Reserved
Status IRQ : Interrupt is triggered when TS is entering or exiting HOT region
TSWARMI
Status IRQ : Interrupt is triggered when TS is entering or exiting WARM region
TSCOOLI
Status IRQ : Interrupt is triggered when TS is entering or exiting COOL region
TSCOLDI
Status IRQ : Interrupt is triggered when TS is entering or exiting COLD region
PWR_RdyI
Status IRQ : Interrupt is triggered when PWR_Rdy is from bad to good or from good to bad
MIVRI
Status IRQ : Interrupt is triggered when MIVR loop is from inactive to activate or from active
to inactive
0x27
STAT
Mask
TSHOTIM
TSWARM
IM
Reset
Value
0
0
0
Read/Write
R/W
R/W
R/W
TSHOTIM
TSCOO TSCOL
LIM
DIM
MIVRIM
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
Reserved Reserved
TS in HOT interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
TSWARMIM
TS in WARM interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
TSCOOLIM
TS in COOL interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
TSCOLDIM
TS in COLD interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
PWR_RdyIM
PWR_Rdy interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
MIVRIM
MIVR interrupt mask
0 : Interrupt is not masked
1 : Interrupt is masked
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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32
PWR_
RdyIM
is a registered trademark of Richtek Technology Corporation.
DS9460-03
December 2016
RT9460
Outline Dimension
Dimensions In Millimeters
Symbol
Dimensions In Inches
Min.
Max.
Min.
Max.
A
0.525
0.625
0.021
0.025
A1
0.200
0.260
0.008
0.010
b
0.290
0.350
0.011
0.014
D
2.470
2.570
0.097
0.101
D1
E
2.000
2.470
0.079
2.570
0.097
0.101
E1
2.000
0.079
e
0.500
0.020
25B WL-CSP 2.52x2.52 Package (BSC)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9460-03
December 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
33
RT9460
1
1
2
2
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A3
0.175
0.250
0.007
0.010
b
0.150
0.250
0.006
0.010
D
3.900
4.100
0.154
0.161
D2
2.650
2.750
0.104
0.108
E
3.900
4.100
0.154
0.161
E2
2.650
2.750
0.104
0.108
e
L
0.400
0.300
0.016
0.400
0.012
0.016
W-Type 32L QFN 4x4 Package
Richtek Technology Corporation
14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
www.richtek.com
34
DS9460-03
December 2016
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湘ICP备2023018690号
