MP2617H
Wide input Voltage, 3A, Switching Charger
With NVDC Power Path Management
For Single Cell Li+ Battery
DESCRIPTION
FEATURES
The MP2617H is a monolithic, switch-mode,
battery charger with power path management for
single-cell Li-ion batteries in a wide range of
tablets and other portable devices. The
MP2617H integrates a synchronous buck
regulator that provides regulated voltage to
power the system output and charge the battery
simultaneously. The MP2617H supports both
USB and high-power DC adapter inputs. In USB
mode, the input current limit can be programmed
to 450mA or 825mA via the logic pins to cover
USB2.0 and USB3.0 specifications. When the
adapter input is present, the input current can
also be limited to avoid overloading the DC
adapter. The input current limit can be
programmed up to 3A.
Smart power path management allows the
MP2617H to regulate the system voltage for
powering an external load and charging the
battery independently and simultaneously. This
allows for immediate system operation, even
under missing or deeply discharged battery
conditions. When the input current limit is
reached, the system load is satisfied first, and
then the charger uses the remaining current to
charge the battery. Additionally, the smart power
path control allows for an internal connection
from the battery to the system to supplement
additional power to the load in the event the
system power demand increases over the inputlimited power or the input is removed.
The MP2617H features high integration with all
power switches integrated internally. No external
MOSFET, blocking diode, or current sense
resistor is required.
4V to 14V Operating Input Voltage
Smart Power Path Management
Five Control Loops: Input Current Limit,
Input Voltage Limit, Constant Charge
Current, Terminal Battery Control, and
Thermal Fold-back
1.6MHz Switching Frequency
Programmable Input Current Limit
Programmable Charge Current
Single Input for USB and AC Adapter
Covers USB2.0 and USB3.0 Input
Specifications
Fully Integrated Power Switches
No External Blocking Diode or Sense
Resistor Required
Charging Operation Indicator
Built-In Programmable Charging Timer
Thermal Limiting Regulation on Chip
Battery Temperature Monitor
Available in a QFN-20 (3mmx4mm)
Package
APPLICATIONS
Smartphones
E-Books
GPS
Portable Media Players
Portable Handheld Solutions
Tablet PCs
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.
For MPS green status, please visit the MPS website under Quality
Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are
trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
Two status monitor output pins are provided to
indicate the battery’s charge status and power
source status. Other features include trickle
charge, battery temperature monitoring, and
timer and thermal limiting regulation on the chip.
The MP2617H is available in a QFN-20
(3mmx4mm) package.
MP2617H Rev. 1.1
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1
MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL APPLICATION
ON OFF
AC adapter
/USB input
VILIM
M0
M1
EN
R3
C1
SYS Load
C3
CHGOK
BST
ACOK
SYS
R4
R1
L
SW
IN
VCC
CSYS
SYSFB
RT1
CIN
R2
C2
PGND
NTC
BATT
ICHG
vBATT
TMR
RT2
CTMR
RNTC
MP2617H
AGND
CBATT
ISET
ILIM
RISET
RILIM
0
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
ORDERING INFORMATION
Part Number
MP2617HGL*
Package
QFN-20 (3mmx4mm)
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP2617HGL–Z)
TOP MARKING
MP: MPS prefix
Y: Year code
W: Week code
2617H: Product code of MP2617HGL
LLL: Lot number
PACKAGE REFERENCE
TOP VIEW
VCC
ILIM
TMR
VLIM
20
19
18
17
SW
IN
2
15
3
14
SW
PGND
4
13
5
12
SYS
SYSFB
EN
6
11
AGND
7
8
9
CHGOK
ACOK
16
M1
1
M0
BST
NTC
ISET
BATT
10
QFN-20 (3mmx4mm)
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
PIN FUNCTIONS
Package
Pin #
1
2, 4
3
5
Name
Description
Bootstrap. A capacitor is connected between SW and BST to form a floating supply across
the power switch driver to drive the power switch’s gate above the supply voltage.
Switch output. Add an external 30V/1A Schottky diode from SW to GND when VIN is higher
SW
or equal to12V and the output power include system load and battery charging is over 10W.
IN
Power input of the IC from adapter or USB.
PGND Power ground.
BST
_____
6
7
8
_____
EN
M0
M1
_____________
9
_____
Function logic control of the IC. Drive EN to logic low to enable the part. Drive EN to logic
high to disable the part.
Mode select input. M0 sets the input current limit mode in combination with M1.
Mode select input. M1 sets the input current limit mode in combination with M0.
_____________
Open-drain output. CHGOK is pulled low during charging. CHGOK is pulled high through an
CHGOK
external resistor to VCC to indicate that the charge is complete.
_____________
__________
10
11
12
13
14
15
16
17
18
19
20
__________
Open-drain output. ACOK is pulled low to indicate the presence of a valid input power
__________
ACOK supply. ACOK is pulled high through an external resistor to VCC to indicate an invalid or
removed input.
AGND Analog ground.
SYS voltage program. Connect a resistor divider from SYSFB to SYS and AGND to program
SYSFB
the system output voltage. Leave SYSFB floating to disable the function.
SYS DC/DC regulator output to power the system load and charge the battery.
BATT Positive battery terminal.
Charge current program. A resistor from ISET to AGND can program the charge current
ISET
during CC charging. Float ISET to disable the charge function.
Thermistor input. Connect a resistor from NTC to VCC and the thermistor from NTC to
NTC
ground. The thermistor is inside the battery pack.
Input current limit program. A resistor from ILIM to AGND can program the input current
ILIM
limit with the adapter input.
Set timer out period. Connect a 0603 ceramic capacitor from TMR to GND to set the timer
TMR
out period. Connect TMR pin to AGND to disable the internal timer.
VLIM Input voltage limit program.
VCC Supply voltage of the IC.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
IN, SW ..........................................-0.3V to +20V
BATT, SYS .....................................-0.3V to +6V
BST ...............................................-0.3V to +26V
All other pins ...................................-0.3V to +6V
Continuous power dissipation (TA = +25°C) (2)
QFN-20 (3mmx4mm) ................................. 2.6W
Junction temperature ................................150°C
Lead temperature .....................................260°C
Storage temperature .................. -65°C to 150°C
QFN-20 (3mmx4mm) ............. 48 ....... 11 ... °C/W
Recommended Operating Conditions (3)
Supply voltage (IN) .......................... 4.0V to 14V
Operating junction temp. (TJ) ... -40°C to +125°C
θJA
θJC
NOTES:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its operating
conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP2617H Rev. 1.1
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5
MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
ELECTRICAL CHARACTERISTICS
VIN = 5.0V, TA = 25°C, unless otherwise noted.
Parameters
Input Power (IN)
IN operating range
Symbol
VIN
Input quiescent current
SYS to IN reverse current
blocking
SYS Output
Minimum SYS regulation
voltage
SYS regulation voltage
SYS reference voltage
Battery Discharge
BATT to SYS resistance
BATT to SYS current limit
Units
14 (5)
3.95
3.65
320
120
3.25
1.8
500
900
2160
2160
1.1
1.14
1.18
V
RH_DS(ON) Include the block MOSFET
120
130
mΩ
RL_DS(ON)
80
100
mΩ
3.8
4.8
5.8
A
Voltage on VLIM
1.49
Charger enabled, USB2.0 mode
Charger enabled, USB3.0 mode
Charger enable, programmable mode
Charger enabled, default mode
Disabled, EN = 0V
SYS = SW = 4.5V, VIN = 0V,
monitor VIN leakage
1.52
2.4
2.8
3.8
3.8
3
1.55
5
5
5
5
5
V
mA
mA
mA
mA
µA
0.01
0.2
µA
3.45
3.6
3.75
V
3.5
VBATT +
0.2V
4.5
V
Switching frequency
Input current limit reference
voltage
High-side NMOS on
resistance
Low-side NMOS on resistance
High-side NMOS peak current
limit
Input voltage clamp threshold
Max
1.4
400
750
1840
1840
VBST - VSW
Rising
Falling
Rising
Falling
Rising
Hysteresis
IIN
USB2.0 mode
USB3.0 mode
Default mode
Programmable mode, RILIM = 23kΩ
VILIM
VVLIM
IIN
VSYS
VSYS
SYS voltage at VBATT ≤ 3.4V,
SYSFB float
3.4V < VBATT ≤ 4.2V, SYSFB float,
BATT float
Programmed by SYSFB
VSYS_REF
VIN = 0V, ISYS = 200mA, VBATT = 4.2V
VSYS > VBATT - 800mV, VBATT = 4.2V
SYS short
4.0
3.65
3.35
240
40
2.55
Typ
V
V
V
mV
mV
V
mV
MHz
mA
mA
mA
mA
IN vs. BATT threshold
Input current limit
Min
3.8
3.5
280
70
2.9
150
1.6
450
825
2000
2000
IN under voltage lockout
threshold
BST voltage threshold
Condition
4.08
1.135
5
4.4
1.152 1.170
40
6.2
230
MP2617H Rev. 1.1
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50
7.4
V
V
mΩ
A
mA
6
MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5.0V, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Battery Charger Voltage Spec
Condition
VBATT > VRECH, ICHG ≤ IBF,
SYSFB float
Terminal battery voltage
Min
Typ
Max
Units
4.179
4.2
4.221
V
3.9
3.85
VSYS 0.04 x
IBF
4.0
3.95
85
3
200
VBATT
VSYS < 4.2V, programmed by SYSFB
Recharge threshold at VBATT
VRECH
Recharge hysteresis
Trickle charge threshold
Trickle charger hysteresis
Battery Charger Current Spec
Trickle charge current
ITRICKLE
Termination charger current
IBF
IBF maximum limit
Constant current mode
charge current
ICC
ISET reference voltage
Battery UVLO
Idea diode regulation voltage
VSYS
BATT leakage current
IBATT
__________
SYSFB float
SYSFB programmed
2.9
V
4.1
4.05
3.1
V
V
mV
V
mV
10%
10% 15%
150
200
RISET = 760Ω
2.475 2.75 3.025
RISET = 1.53kΩ
1.26
1.4
1.54
RISET = 4.6kΩ
0.405 0.450 0.495
1.1
1.15
1.2
Rising
2.4
2.6
2.8
Falling
2.2
2.4
2.6
VBATT Supplement mode
65mV
VBATT = 4.2V, SYS float, VIN = PGND
20
30
ICC
ICC
mA
A
A
A
V
V
V
Sinking 5mA
5%
mV
µA
_____________
ACOK, CHGOK
__________
_____________
ACOK, CHGOK output low
voltage
270
350
mV
0.1
0.5
μA
__________ _____________
ACOK,CHGOK leakage
Connected to 3.3V
current
Timer
Trickle charge time
CTMR = 0.1µF, ICHG = 1A
CC charge time
CTMR = 0.1µF, ICHG = 1A
Negative Temperature Coefficient (NTC) Control
NTC low temp rising
VTHL
RNTC = NCP18XH103F, 0°C
threshold
Hysteresis on low temp
threshold
NTC high temp falling
VTHH
RNTC = NCP18XH103F, 50°C
threshold
Hysteresis on high temp
threshold
45
6.5
63
65
Min
Hour
67
35
32
33.5
70
MP2617H Rev. 1.1
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%VCC
mV
35
%VCC
mV
7
MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5.0V, TA = 25C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Rising
Falling
0mA < IVCC < 25mA, VIN = 6V
3.15
2.8
4.3
3.35
3
4.5
40
3.55
3.2
4.6
V
V
V
mA
0.4
V
VCC Supply
VCC UVLO
VCC output voltage
VCC output current limit
Logic
EN input low voltage
1.5
EN input high voltage
EN input current
M0, M1
4
EN = 4V
EN = 0V
Logic high
Logic low
Protection
Thermal limit temperature
Thermal shutdown
V
-0.5
8
-0.1
1.5
0.4
120
150
μA
V
V
°C
°C
NOTE:
5) A Schottky diode is required from SW to GND when Pout is higher than 10W and VIN is over 12V.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5.0V, VBATT = full range, default mode, IIN limit = 2A, VSYS = 4.4V, R6 and R7 are floating, ICHG =
2A, VIN clamp = 4.5V, L = 1.2 µH, TA = +25°C, unless otherwise noted.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VBATT = full range, default mode, IIN limit = 2A, VSYS = 4.4V, R6 and R7 are floating, ICHG =
2A, VIN clamp = 4.71V, L = 2.2µH, TA = +25°C, unless otherwise noted.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VBATT = full range, default mode, IIN limit = 2A, VSYS = 4.4V, R6 and R7 are floating, ICHG =
2A, VIN clamp = 4.71V, L = 2.2µH, TA = +25°C, unless otherwise noted.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VBATT = full range, default mode, IIN limit = 2A, VSYS =4.4V, R6 and R7 are floating, ICHG =
2A, VIN Clamp = 4.71V, L = 2.2µH, TA = +25°C, unless otherwise noted.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VBATT = full range, default mode, IIN limit = 2A, VSYS = 4.4V, R6 and R7 are floating, ICHG =
2A, VIN clamp = 4.71V, L = 2.2µH, TA = +25°C, unless otherwise noted.
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
BLOCK DIAGRAM
BST
Trim
IN
HSG
SYSFB1
EAO
EA
3.6V
Converter
control
Max(A,B)
VBATT+200mV
M1
Input current
limit reference
selector
Iref
SW
Driver
EA
L
SYS
C
LSG
M0
EAO
SYSFB
VREF
EA
SYSFB
SYSFB
VBG
ILIM
SYS
SYSFB1
VLIM
1.5V
4 0mO
VBATx 2
Charge
Pump
VIN
Ideal diode
regulation
VTH
SYS
Battery switch
current limit
BATT
EN
3.5 V coarse
LDO &
3.0 V UVLO
BATT
EN
BATTFB
CC/ CV linear
charger
BATTFB
VBG
VREF_CC
VCC
EN
Bandgap
& Bias
VBG
4.5 V LDO
Charger Control & Chip Logic
3 .8 V UVLO
UVLO
VIN
GND
CHGOK
ACOK
TMR
NTC
ISET
Figure 1: Functional Block Diagram
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
OPERATION
The MP2617H is a switching charger IC with
integrated, smart, power path management for
powering the system and charging a single-cell
battery independently and simultaneously.
The MP2617H includes an input DC/DC stepdown converter for a wide range of DC sources
and USB inputs. The MP2617H has a precision
average input current limit to make maximum
use of the allowable input power. This feature
allows for fast charging when the charger is
powered from a USB port and ensures that the
input current never exceeds the input power
specification. Additionally, the input current limit
threshold can be programmed by the logic inputs
or a resistor from ILIM to ground.
The MP2617H implements an on-chip 40mΩ
MOSFET, which works as a full-featured linear
charger with trickle charge, high-accuracy,
constant-current (CC) charge and constantvoltage (CV) charge, charge termination, autorecharge, NTC monitor, built-in timer control,
charge status indication, and thermal protection.
The charge current can be programmed by an
external resistor connected from ISET to AGND.
The IC limits the charge current when the die
temperature exceeds thermal regulation
threshold.
The 40mΩ MOSFET works as an ideal diode to
connect the battery to the system load when the
input power is not enough to power the system
load. When the input is removed, the 40mΩ
MOSFET is turned on, allowing the battery to
power up the system.
With smart power path management, the system
load is satisfied first, and the remaining current
is used to charge the battery. The MP2617H
reduces the charging current or uses power from
the battery to satisfy the system load when its
demand is over the input power capacity.
DC/DC Step-Down Converter
The DC/DC converter is a 1.6MHz, step-down,
switching regulator to provide input power to
SYS, which drives the combination of the system
load and battery charger. The regulator contains
an input current measurement and control
scheme to ensure that the average input current
remains below the level programmed via ILIM or
the logic inputs (M0 and M1). This ensures
compliance with the USB specifications and
prevents overloading the wall adapter.
When the input voltage is higher than the undervoltage lockout (UVLO) threshold and 280mV
higher than the battery voltage, the input voltage
——————
OK signal is active (ACOK becomes low), and
the DC/DC converter soft starts. The input power
is sufficient for supplying the combination of the
system load and battery charger, and the input
current limit loop is not triggered. The converter
output voltage (VSYS) is regulated.
If BATT is greater than 3.4V, VSYS is
approximately 0.2V above the battery voltage to
minimize the power loss of the battery charger
during fast charging. If BATT is less than 3.4V,
VSYS is fixed at 3.6V to power the system
immediately, even when a drained battery is
inserted to be charged (see Figure 2).
The system voltage can also be regulated to any
value between 4.08V to 4.4V in the MP2617H by
using a resistor divider on SYSFB (see R6 and
R7 in Figure 10). If SYSFB is left floating, the
system program is invalid, and VSYS is regulated
according to BATT voltage (see Figure 2).
The converter adopts a fixed off-time control to
extend the duty cycle (close to 100%) when the
input of the converter is close to VSYS.
4.4V
4.2V
VS Y S
200m V
3.6V
V B A TT
3.4V
4.2V
Figure 2: SYS Regulation Output
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
At near-100% duty operation, the BST refresh
operation ensures that the driver voltage of the
high-side MOSFET (HS-FET) is charged by
turning on the low-side MOSFET (LS-FET) until
the negative inductor current (IL) reaches a
threshold.
If the input power is insufficient for supplying the
combination of the system load and battery
charger, the DC/DC converter limits the total
power requirement by restricting the input
voltage, input current, and peak current through
the MOSFET. The power path management
reduces the charge current to satisfy the external
system load first. According to this feature, the
USB specification is always satisfied first, even if
the charge current is set higher than the USB
input current limit, and the real charge current is
reduced as needed.
Input Limit State
If the input power is insufficient for supplying the
combination of the system load and battery
charger, the MP2617H implements three input
limit control loops to reduce the charge current
and satisfy the external system load first. The
input in this case might be limited with either
input current limit, input voltage limit, or DC/DC
peak current limit.
1. Input-Current Limit: When the input current is
higher than the programmed input current
limit, the input current limit loop takes the
control of the converter and regulates the
input current at a constant value. If the
battery voltage is over 3.4V, the output
voltage (VSYS) drops down according to the
increase of the system current, and the
charge current drops down after the BATTto-SYS switch (40mΩ MOSFET) is fully on
according to VSYS dropping down. During this
process, the system voltage is slightly higher
than VBATT. If the battery voltage is lower than
3.4V, to maintain the minimum system
voltage and ensure system operation, the
input current limit control pulls down the
charge current directly o reduce the load of
the converter so the system current is
satisfied first. Input-Voltage Limit: A resistor
divider from IN to VLIM to AGND is used for
input voltage limit control. When the voltage
on VLIM reaches the 1.52V reference
voltage, the output of the input voltage limit
error amplifier drops to control the operation
duty. In this mode, the input voltage is
clamped according to the value set by the
resistor divider. The control to the system
voltage and charge current is the same as
the input current limit control. The charge
current drops down to satisfy the system
current request first. This feature provides a
second protection to the input power and
ensures safe operation of the input adapter.
Even if the wrong adapter is inserted, the
MP2617H can continue operating, providing
the maximum power to its load. The input
voltage limit value can be programmed
through the resistor divider from IN to VLIM
to AGND.
2. Peak-Current Limit: The peak current of the
high-side switch of the DC/DC converter is
sensed during every cycle and is compared
to the 4.8A reference. If the peak current
reaches the threshold, peak-current limit
mode is triggered. The control of the charge
current is the same as the input current limit
and input voltage limit.
Input Current Limit Setting
The ILIM current is a precise fraction of the
adapter input current. When a programming
resistor is connected from ILIM to AGND, the
voltage on ILIM represents the average input
current of the pulse-width modulation (PWM)
converter. The input current approaches the
programmed limit, and the ILIM voltage reaches
1.14V.
The average input current limit can be set
through the resistor connected from ILIM to
AGND according to Equation (1):
IIN_LIM =1.14
40000
(mA)
RILIM (kΩ)
(1)
When connected to a USB power source, the
input current limit is set internally, and the
programmed value is invalid. The MP2617H
provides a typical 450mA input current limit for
USB2.0 specification, and a typical 825mA
current limit for USB3.0 specification.
The input current limit can be set through the two
logic pins (M0 and M1) according to its input
specification (see Table 1). Both M0 and M1 are
pulled to logic high when floating.
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
Under this condition, the input current is limited
to a default value of 2A.
the system load requirement is low, the battery
can be charged at a fully constant current.
Table 1: Input Current Limit Setting by M0 and
M1
M0
M1
Mode
Low
Low
USB2.0 mode
Low
High
USB3.0 mode
High
Low
Programmable mode
High/float High/float
Default mode
When the battery voltage reaches the battery full
threshold, the charger enters constant-voltage
mode operation.
Input Voltage Limit Setting
The input voltage can be limited at a value set by
a resistor divider from IN to VLIM to AGND
according to the Equation (2):
VIN_LIM =1.52
R1+R2
(V)
R2
(2)
When the voltage on VLIM drops and reaches
the 1.52V reference voltage, the input voltage is
clamped to the setting value.
Battery Charger
The MP2617H’s complete charge operation
consists of trickle charge, automatic charge
termination, charge status indication, timer
control, NTC indication, automatic recharge, and
thermal limiting.
When the PWM converter exits soft start, the
battery charge cycle begins. The MP2617H first
determines if the battery is deeply discharged. If
the battery voltage is lower than the trickle
charge threshold (typically 3.0V), the battery
charger starts in trickle charge mode. The trickle
charge current is limited to 10% of the
programmed charge current until the battery
voltage reaches 3.0V. If the charge remains in
trickle charge mode for longer than “trickle
charge timer period”, the timer out condition is
_____________
triggered, the charge is terminated, and CHGOK
starts blinking to indicate that the battery is
unresponsive. When the battery voltage is above
3.0V, the charger operates in constant-current
mode. The current delivered to the battery
attempts to reach the value programmed by
ISET. Depending on the available input power
and system load conditions, the battery charger
may or may not be able to charge at the fully
programmed rate. The system load is always
satisfied first over the battery charge current. If
End of Charge (EOC) and Indication
In constant-voltage charge mode, the battery
voltage is regulated at 4.2V when SYSFB is
floating or SYS is programmed higher than the
battery-full threshold, and the charge current
decreases naturally. Once the charge current
reaches the battery full threshold (IBF, 1/10 the
programmed charge current), the battery is fully
charged, and charge cycle is terminated.
If the charge current drops below IBF because of
any limit condition, the MP2617H exits CV mode,
and the charge-full detection is invalid.
A safe timer starts at the beginning of each new
charge cycle and monitors whether the entire
charge period is within the programmed time
limit. After each charge cycle, when the battery
is indicated as full, the timer counter resets. If the
time expires while the charging is still ongoing,
the timer forces the MP2617H to terminate
_____________
charging. CHGOK blinks to indicate the fault
condition.
If system voltage is programmed below 4.2V by
the resistor divider at SYSFB, the battery is
charged close to VSYS until the charge current
reaches the IBF threshold.
Automatic Recharge
Once the battery charge cycle is completed, the
MP2617H turns off, indicating the battery-full
status. During this process, the battery power
may be consumed by the system load or selfdischarge. If the input power is always on, to
ensure that the battery is not exhausted, the new
charge cycle begins automatically when
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
the battery voltage falls below the auto-recharge
threshold (VRCHG) when SYSFB is floating, or
VRCHG minus 50mV if SYSFB is not floating and
connected to a resistor divider. The timer restarts
when the auto-recharge cycle begins.
charger function, while the output of the PWM
converter continues to supply power to the
system. Conversely, a resistor from ISET to
AGND enables charging at the programmed
charge current.
During the charge-off state when the battery is
fully charged, if the input power is recycled, or
the EN signal is refreshed, the charge cycle
restarts, and the timer refreshes, even if the
battery voltage is above the auto-recharge
threshold.
The logic control of the ISET pin of the MP2617H
can be set as shown in Figure 3. In this way, logic
low can be set as the off signal, and logic high
can be set as the on signal with an N-channel
MOSFET.
Charge Current Setting
ISET
OFF ON
The charge current of the MP2617H is
programmed using a single resistor from ISET to
ground. The program resistor and charge current
can be calculated with Equation (3):
ICHG 1.15
1800
(mA)
RISET (k)
(3)
In either constant-current mode or constantvoltage mode, the ISET voltage is proportional to
the actual charge current delivered to the battery
(IBATT). The charge current can be calculated by
monitoring the ISET voltage with Equation (4):
VISET
IBATT =
×I
1.15 CHG
RISET
Figure 3: ISET Logic Control
__________
Input Power Status Indication (ACOK)
An internal UVLO circuit monitors the input
voltage and keeps the IC in its off state until the
input rises over the rising threshold (3.8V). When
the input voltage decreases below the lower
threshold (3.5V), the IC turns off, and the system
load is powered by the battery automatically.
__________
(4)
Additionally, the actual battery charge current
may be lower than the programmed current due
to the limited input power available and
prioritization of the system load.
The battery charge full-current threshold (IBF) is
set internally at 10% of the programmed charge
current. However, IBF has a 150mA maximum
limit which cannot be exceeded.
Logic Control
The MP2617H has two separate enable control
_____
pins. EN is a logic control pin that controls the
_____
operation of the entire IC. When EN is low, the
IC is enabled, and the PWM converter output
ACOK is an open-drain, active-low output that
indicates the status of the input power. The input
is considered valid when the input voltage is over
the UVLO rising threshold and 280mV higher
than the battery voltage to ensure that both the
converter and the charger can operate normally.
If the input voltage from an adapter or a USB port
__________
is indicated as OK, ACOK turns low.
_____
During EN off or thermal shutdown conditions,
__________
ACOK turns high to indicate that no power is
__________
provided by the input to the system. The ACOK
signal indicates whether the input is supplying
power to the system load or not. Any other
__________
condition cannot affect the ACOK indication as
long as the input power is present.
_____
powers the system and the charger. When EN is
high, both the PWM converter and the charger
are disabled. The BATT-to-SYS switch fully turns
on to connect the battery to power the system.
ISET can be also used to control the operation
of the charger. Floating ISET disables the
_____________
Charge Status Indication (CHGOK)
_____________
CHGOK is an open-drain, active-low output that
_____________
indicates the status of the charge. CHGOK is low
during normal charging operation and turns high
_____________
after the charge is full. CHGOK blinks if a fault
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
condition occurs, including an NTC fault (battery
temperature is invalid) and timer out (bad
battery).
_____________
In the event of a fault condition, CHGOK
switches at 6Hz with a 50% duty cycle and
enters blinking mode. Check the application
circuit to find the root cause of the fault condition
if the blinking signal is asserted.
_____________
For no-battery conditions, CHGOK blinks
according to the transition between charging and
charge full. The blinking frequency is determined
by the charge and discharge cycle of the output
capacitor.
If the charge current to the battery is low or if the
battery is in supplement mode caused by
_____________
insufficient input power, CHGOK remains low to
avoid providing a false charge-full indication.
__________
_____________
Table 2 shows the ACOK and CHGOK status
under different charge conditions.
Table 2: Charger Status Indication
__________
_____________
ACOK
CHGOK
Low
Low
Low
High
Low
Blinking at
6Hz
Charger Status
In charging, supplement
mode
End of charge, ISET
disable charger only
NTC fault, timer out
_____
High
High
VIN absent, EN disable,
thermal shutdown
Timer Setting
The MP2617H uses an internal timer to
terminate charge if the timer times out. The timer
duration is programmed by an external capacitor
at the TMR pin and related to the real battery
current (IBATT).
t Cycle
C TMR 0.73 2
(s)
I BATT
-6
1 10
40000
The trickle mode charge time is:
t Trickle_TMR 45055 t Cycle(s)
If a CTMR (0.1µF) is connected, the trickle charge
current is just 0.1A, and suppose the
capacitance and battery current is fixed at this
value, the trickle charge time is calculated about
31 minutes.
The total charge time (during CC and CV mode)
is:
t Total_TMR 3407871 t Cycle(s)
If a CTMR (0.1µF) is connected, the CC charge
current is 1A, and suppose the capacitance and
battery current is fixed at this value, the CC
charge time is calculated about 5.3 hours.
During CV mode, as the charge current
decrease naturally, so the timer cycle increases
naturally according to the formula. The time
period also will increased during CV mode. The
battery is closer to full state, the timer period is
longer.
As a result of power path management control,
charge current might vary during normal
operation, under this condition, the MP2617H
automatically takes into account this variation
and adjust the timer period accordingly.
If charge is stopped due to high system load, the
timer is temporarily suspended. This feature
avoids indicating a false trigger indication for bad
battery indication when there is little charge
current delivered to the battery as a result of the
insufficient input power.
When the timer out condition occurs, the
MP2617H terminates the charge at once and
_____________
CHGOK blinks to indicate the fault status. If one
of the following events happens, the timer is
refreshed and MP2617H re-starts the charge
cycle.
Input re-startup
Refresh EN /ISET signal
Auto-Recharge
_____
Battery Temperature Monitor
The MP2617H continuously monitors battery’s
temperature by measuring the voltage at the
NTC pin, typically determined by a negative
temperature coefficient (NTC) thermistor and
external voltage dividers, as shown in Figure 5.
Both the external voltage divider and the internal
reference voltage divider are pulled up to the
same power pin. So actually, the voltage ratios
between the internal and external dividers are
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
compared. For the NTC thermistor, the hotter
ambient temperature, the lower resistance is,
which corresponds to a lower voltage ratio, vice
versa.
Icc
Charge
Current
VBATT_REG
VCC
RT1
NTC
RNTC
Charge
Voltage
Low Temperature
Threshold
VTH_COLD
NTC
Protection
RT2
High Temperature
Threshold
VTH_HOT
COLD
HOT
Figure 5: NTC Protection Circuit
Figure 6: Standard NTC Window
According to Figure 5， the following equations
are list:
Thermal Protection
The MP2617H implements thermal protection to
prevent thermal damage to the IC or surrounding
components. An internal thermal sense and
feedback loop decrease the charge current
automatically when the die temperature rises to
about 120°C. This function is referred to as the
charge current thermal fold-back. This feature
protects the MP2617H from excessive
temperature due to high-power operation or high
ambient thermal conditions. Another benefit of
this feature is that the charge current can be set
according to the requirement rather than the
worst-case condition for a given application with
the assurance of safe operation. The MP2617H
stops charging if the junction temperature rises
above 150°C as the IC enters thermal shutdown
protection.
VTHL =
VTHH =
VTH_COLD
VCC
VTH_HOT
VCC
=
=
R T2 //R NTC_LOW
R T1 +R T2 //R NTC_LOW
R T2 //R NTC_HIGH
R T1 +R T2 //R NTC_HIGH
VTHL actually means the low temperature
threshold limit ratio (Cold Limit) and VTHH means
the high temperature threshold limit ratio (Hot
Limit). RNTC_LOW means the resistance of the
selected NTC thermistor under low temperature,
while RNTC_HIGH means the resistance of the
selected NTC thermistor under high temperature.
Once the external voltage ratio exits the low
temperature threshold (VTHL) to high temperature
threshold (VTHH) range, it means the battery
temperature is out of the COLD to HOT range,
the IC suspends charging and reports the NTC
fault. Charging resumes automatically after the
battery temperature is within the COLD to HOT
temperature range again. Figure 6 shows the
standard control.
Ideal Diode Mode
If the system current requirement increases such
that the pre-set input current limit of the PWM
converter is reached and the charge current has
reduced to zero, the additional current will be
drawn from the battery via the BATT-to-SYS
switch. To avoid very large currents from being
drawn from the battery which might affect the
reliability of the device, the MP2617H controls
the battery MOSFET to work in the ideal diode
mode. When VSYS drops to 40mV lower than
VBATT, then the MP2617H will enter ideal diode
mode and regulate VSYS to VBATT - 65mV. After
the system load decreases and VSYS is 40mV
higher than VBATT, the battery MOSFET exits
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
ideal diode mode, and the charge cycle restarts
softly.
VBATT-40mV
Enable Ideal Diode Mode
VSYS
Disable Ideal Diode Mode
VBATT+40mV
Figure 4: Ideal Diode Mode Enable/Disable
Battery Discharge Protection
When the input power is removed or invalid, the
system load draws power from the battery via the
battery switch. Under this condition, the battery
switch is fully on to minimize power loss. The
MP2617H
integrates
battery
discharge
protection. If the battery discharge current is
larger than the discharge current limit threshold
(IDIS, 6.2A), the current is regulated at the pre-set
limited value. If the current increases further, the
SYS voltage starts to decrease. When VSYS
drops to about 800mV below VBATT, a SYS short
condition is detected. Under this condition, the
discharge current is limited at 230mA. In the
event of a short from the system to GND, the
discharge current from the battery to the system
is also limited to 230mA.
The battery voltage UVLO is always monitored.
If the battery voltage is lower than the battery
UVLO threshold, the battery switch is turned off
immediately. This feature prevents the battery
from being over-discharged.
Dynamic Power Path Management (DPPM)
In the presence of a valid input source, the PWM
converter supplies current to both the system
and the battery charger.
The voltage (VSYS) is regulated based on the
value of the battery voltage. When VBATT is higher
than 3.4V, VSYS is regulated 200mV above VBATT
to charge the battery. When VBATT is lower than
3.4V, VSYS is regulated at a constant 3.6V to
ensure that the system can still be powered up,
even with a drained battery connected.
When the input source is overloaded, either the
current exceeds the input current limit or the
voltage falls below the input voltage limit. The
MP2617H 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. If the system current increases
beyond the power allowed by the input source,
additional power is drawn from the battery via an
on-chip 40mΩ MOSFET working as an ideal
diode. If the system current increased further,
when the discharge current times the Ron is over
65mV, the VSYS can not be regulated, the BATT
to SYS MOSFET just turned fully on, the battery
powers the system together with the converter
from VIN as the supplement mode.Additionally,
if the input source is removed, the MP2617H
turns on the 40mΩ MOSFET, allowing the
battery to power the system load to maintain the
operation of the portable device.
Operation Flow Chart
Figure 5 shows the operation flow chart of the
MP2617H. Figure 6 shows the operation process.
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
POR
Chip Enable?
No
Yes
VIN>3.0V?
No，
POR="1"
Yes,
POR="0"
Enable BG
VBATT>VBATT_UVLO?
BGOK="0"
BGOK="1"
Yes
Battery power system
Enable discharge limit
No
Enable VREF LDO
V IN>VIN_UVLO (VTH)?
System shuts down
No power to system
No,
UVLO="1"
Yes,
UVLO="0"
V IN>VBATT+280mV?
Yes
Enable DC-DC
DC-DC soft starts
VSYS_REF=max(VBATT+
200mV,3.6V
VSYS>VBATT ?
ISET OK?
Yes
No
Battery power
system switch
turns off
DC-DC starts ready?
Yes
No
Enable Battery
Charger
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
Clamp DC-DC
EAO to regulate
the part
at the limit state
Yes
Any Limit condition
triggered?
No
VBATT3.0V?
Yes
Yes
No
No
Trickle Charge
ICHG=10%ICC
CC/CV Charge
VSYS drops down,
Charge switch
is fully on
Decrease ICHG,
Keep VSYS=3.6V
Yes
No
Limit condition
Removed?
ICHG=IBF?
Charge Full, EOC=1
TMR off,
clear the counter
DC-DC keeps work
Satisfy System current
Charge the battery with
remaining current
No
Yes
No
No
Yes
Charge in
CV mode and
ICHG3.95A
SMD
Any
Ceramic Capacitor;10V;
X5R or X7R
Ceramic Capacitor;6.3V;
X5R or X7R
Ceramic Capacitor;16V;
X5R or X7R
Ceramic Capacitor;6.3V;
X5R or X7R
Ceramic Capacitor;10V;
X5R or X7R
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
TYPICAL APPLICATION CIRCUITS
ON OFF
R5 100k
VILIM
12V Input
C1
1uF
R1
21k
M1
RT1
10k
R2
C2
10k
1uF RT2
10k
SYS Load
L
2.2uH
D1
C3
BST
CHGOK
R4 2k
EN
SW
R3 2k
100nF
ACOK
VCC
CIN
22uF
M0
IN
SYS R6
MP2617H
SYSFB
C4
22uF
4.7uF
10k
PGND
NTC
26.5k
R7
CSYS
ICHG
BATT
vBATT
TMR
CTMR
100nF
CBATT
ISET
ILIM
AGND
RILIM
15.4k
RISET
1.05k
22uF
0
Figure 10: Typical Charge Application Circuit for 12V Input and 3A Total System Load
Table 7: The Key BOM of Figure 10.
Qty
Ref
Value
1
CIN
22μF
1
C1
1μF
1
C2
1uF
1
C3
100nF
1
C4
4.7uF
1
CTMR
100nF
2
CSYS,CBATT
22uF
1
R6
26.5k
3
RT1,RT2,R7
10k
1
L1
1
D1
Description
Ceramic Capacitor;25V;
X5R or X7R
Package
Manufacture
1206
Any
0603
Any
0603
Any
0603
Any
0603
Any
0603
Any
1206
Any
Film Resistor;1%
0603
Any
Film Resistor;1%
0603
Any
2.2μH
Inductor;2.2uH;Low
DCR;ISAT>6A
SMD
Any
30V,1A
30V,1A,schottky diode
SMD
Any
Ceramic Capacitor;25V;
X5R or X7R
Ceramic Capacitor;
6.3V; X5R or X7R
Ceramic Capacitor;25V;
X5R or X7R
Ceramic Capacitor;10V;
X5R or X7R
Ceramic Capacitor;
6.3V;X5R or X7R
Ceramic Capacitor;10V;
X5R or X7R
MP2617H Rev. 1.1
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
PACKAGE INFORMATION
QFN-20 (3mmx4mm)
PIN 1 ID
MARKING
PIN 1 ID
0.10 X 45°TYP
PIN 1 ID
INDEX AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
0.10 X 45°
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE
MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10
MILLIMETERS MAX.
4) JEDEC REFERENCE IS MO-220.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
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MP2617H – SINGLE-CELL SWITCHING CHARGER WITH NVDC POWER PATH
REVISION HISTORY
Revision #
Revision Date Description
1.0
1.01
1.02
9/25/2014
4/8/2015
6/30/2017
1.03
1/15/2018
1.04
8/17/2020
1.1
12/16/2021
Pages Updated
Initial Release
Removed watermark
Updated header
Updated the Electrical Characteristics section with the
corrected EC table; updated the application section with
more details; updated VIN voltage ratings
Updated the Timer Setting section and Battery
Temperature Monitor section
Updated the Resistor Choose for NTC Sensor section
Updated the footnote below the Applications section
Updated the BST voltage threshold specifications in the
Electrical Characteristics section
Grammar and formatting updates
Updated footers
All
1
6
19
28
1
6
6, 33
All
Notice: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
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