5 Description (continued)
The device supports charge current up to 500 mA and supports termination current down to 0.5 mA for
maximum charge. The battery is charged using a standard Li-Ion charge profile with three phases: pre-charge,
constant current and constant voltage regulation.
The device integrates advanced power path management and control that allows the device to provide power to
the system while charging the battery even with poor adapters. The host may also control the power path
through I
2
C allowing it to disconnect the input adapter and/or battery without physically removing them. The
single push-button input eliminates the need of a separate button controller IC reducing the total solution
footprint. The push-button input can be used for wake functions or to reset the system.A 16-bit ADC enables
accurate battery voltage monitoring and can be used to enable a low Iq gauging to monitor battery health. It can
also be used to measure the battery temperature using a thermistor connected to the TS pin as well as external
system signals through the ADCIN pin. The low quiescent current during operation and shutdown enables
maximum battery life. The input current limit, charge current, LDO output voltage, and other parameters are
programmable through the I
2
C interface making the BQ25157 a very flexible charging solution. A voltage-based
JEITA compatible (or standard HOT/COLD) battery pack thermistor monitoring input (TS) is included that
monitors battery temperature and automatically changes charge parameters to prevent the battery from charging
outside of its safe temperature range. The temperature thresholds are also programable through I
2
C allowing the
host to customize the thermal charging profile. The charger is optimized for 5-V USB input, with 20-V absolute
maximum tolerance to withstand line transients. The device also integrates a linear regulator to provide a quiet
rail for radios or processors and can be independently sourced and controlled through I
2
C.
SLUSEC5 – DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
3
Product Folder Links:
Summary of Contents for BQ25157
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