Texas Instruments BQ25157 Manual

www.ti.com
2
BQ25157 I 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
2
– 0.5% Accurate I 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
2
– Advanced I C control allows host to disconnect
the battery or adapter as needed
2
• I 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
2
• 12-mm Total solution size
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
Copyright © 2020 Texas Instruments Incorporated
intellectual property matters and other important disclaimers. PRODUCTION DATA.
2 Applications
• Headsets,
• Smart watches
• Wearable fitness and activity monitors
• Blood glucose 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
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
recommended operating condition of downstream IC's
and system loads for optimal system operation.
PART NUMBER
BQ25157
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
USB
Host
Product Folder Links: BQ25157
SLUSEC5 – DECEMBER 2020
SLUSEC5 – DECEMBER 2020
earbuds and hearing aids
and smart trackers
) threshold set to 6.2 V.
OVP
Device Information
PACKAGE
DSBGA (20)
BQ25157
PMID
IN
C
4
VINLS
LS/LDO
I2C Bus
CE
LP
VDD
INT
PG
VIO
BAT
ADCIN
TS
MR
GND
Simplified Schematic
Submit Document Feedback
BQ25157
BQ25157
2
C based on the
(1)
BODY SIZE (NOM)
2.00 mm x 1.60 mm
System
C
5
<150mA
Load
C
3
<10mA
Load
C
1
C
2
+
NTC
±
1