10 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification, and TI
does not warrant its accuracy or completeness. TI’s customers are responsible for determining
suitability of components for their purposes, as well as validating and testing their design
implementation to confirm system functionality.
10.1 Application Information
A typical application of the BQ25157 consists of the device configured as an I
2
C controlled single cell Li-ion
battery charger and power path manager or small battery applications such as smart-watches and wireless
headsets. A battery thermistor may be connected to the TS pin to allow the device to monitor the battery
temperature and control charging as desired.
The system designer may connect the MR input to a push-button to send interrupts to the host as the button is
pressed or to allow the application's end user to reset the system. If not used this pin must be left floating or tied
to BAT.
The ADCIN pin may be tied to ground or be connected to a signal which the system designer desires to measure
using the integrated ADC. The signal must be scaled down to no exceed the 0 - 1.2 V range of the ADCIN input
range.
10.2 Typical Application
BQ25157
VINLS
PMID
System Load
<150 mA Load
<10mA
Load
LS/LDO
VDD
BAT
2.2 µF
4.7 µF
1 µF
TS
10
NŸ
+
±
10
NŸ
NTC
Host
SCL
GND
IN
4.7 µF
ADCIN
SDA
VIO
Host
VBUS
VIO
MR
LP
CE
PG
INT
22 µF
Figure 10-1. Typical Application Diagram
SLUSEC5 – DECEMBER 2020
94
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Summary of Contents for BQ25157
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