9 Detailed Description
9.1 Overview
The BQ25157 IC is a highly programmable battery management device that integrates a 500-mA linear charger
for single cell Li-Ion batteries, a 16-bit ADC, a general purpose LDO that may be configured as a load switch,
and a push-button controller. Through it's I
2
C interface the host may change charging parameters such as
battery regulation voltage and charge current, and obtain detailed device status and fault information. The host
may also read ADC measurements for battery and input voltage among other parameters, including the ADCIN
pin voltage. The push-button controller allows the user to reset the system without any intervention from the host
and wake up the device from Ship Mode.
9.2 Functional Block Diagram
LDO, and BAT FET Control
Device Control
V
IN
Charge
Enable
I2C
Interface
Low Power Mode
Control
Charge Control
LDO / Load Switch
Control
Thermal
Shutdown
I
BATREG
LDO
Control
UVLO
V
BATREG
V
IN_DPM
BAT
VIN
+
±
ADC
/Power Good
GP Output
Interrupt
JEITA/Temp
Battery Voltage
Charge Current
Information
For Charge Control
VDD
VIN
IIN
PMID
VIN
IIN
VPMID
ICHG
VBAT
VTS
Ext.
S
G
D
S
G
D
Q7
Q8
IN
GND
VIO
/CE
SCL
SDA
/LP
/MR
/INT
/PG
PMID
VDD
VINLS
LDO
BAT
TS
ADCIN
V
BATUVLO
Q5/Q6
1.045 x V
BAT
PMID_REG
SLUSEC5 – DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
15
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Summary of Contents for BQ25157
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