BQ25157 I
2
C Controlled 1-Cell 500-mA Linear Battery Charger With 10-nA Ship Mode,
Power Path With Regulated System (PMID) Voltage, ADC, LDO and 6.2-V OVP
1 Features
• Linear battery charger with 1.25-mA to 500-mA
fast charge current range
– 0.5% Accurate I
2
C programmable battery
regulation voltage ranging from 3.6 V to 4.6 V in
10-mV steps
– Configurable termination current supporting
down to 0.5 mA
– 20-V Tolerant input with typical 3.4-V to 6.2-V
input voltage operating range
– Programmable thermal charging profile, fully
configurable hot, warm, cool and cold
thresholds
• Power Path management for powering system and
charging battery
– Dynamic power path management optimizes
charging from weak adapters
– Advanced I
2
C control allows host to disconnect
the battery or adapter as needed
• I
2
C Configurable load switch or up to 150-mA LDO
output
– Programmable range from 0.6 V to 3.7 V in
100-mV steps
• Ultra low Iddq for extended battery life
– 10-nA Ship mode battery Iq
– 400-nA Iq While powering the system (PMID
and VDD on)
• One push-button wake-up and reset input with
adjustable timers
– Supports system power cycle and HW reset
• 16-Bit ADC
– Monitoring of charge current, battery thermistor
and battery, input and system (PMID) voltages
– General purpose ADC input
• Always on 1.8-V VDD LDO supporting loads up to
10 mA
• 20-Pin 2-mm x 1.6-mm CSP package
• 12-mm
2
Total solution size
2 Applications
•
•
•
Wearable fitness and activity monitors
•
3 Description
The BQ25157 is a highly integrated battery charge
management IC that integrates the most common
functions for wearable, portable and small medical
devices, namely a charger, a regulated output voltage
rail for system power, ADC for battery and system
monitoring, a LDO, and push-button controller. The
BQ25157 has the Input Supply Over Voltage
Threshold (V
OVP
) threshold set to 6.2 V.
The BQ25157 IC integrates a linear charger with
Power Path that enables quick and accurate charging
for small batteries while providing a regulated voltage
to the system. The regulated system voltage (PMID)
output may be configured through I
2
C based on the
recommended operating condition of downstream IC's
and system loads for optimal system operation.
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BQ25157
DSBGA (20)
2.00 mm x 1.60 mm
(1)
For all available packages, see the orderable addendum at
the end of the data sheet.
BQ25157
VINLS
PMID
LS/LDO
VDD
BAT
TS
+
±
NTC
GND
IN
VIO
Host
USB
I2C Bus
<150mA
Load
<10mA
Load
System
ADCIN
MR
PG
INT
LP
CE
C
4
C
5
C
3
C
2
C
1
Simplified Schematic
Copyright © 2020 Texas Instruments Incorporated
1
Product Folder Links:
SLUSEC5 – DECEMBER 2020
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Summary of Contents for BQ25157
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