TI BQ29200 details.

Silkscreen X19b6.

The mobile power buck-boost chip adopts SC8815 of Nanxin Semiconductor. The chip's I²C programmable charge current and charge voltage, programmable discharge output voltage, programmable input / output current limit; built-in 10-bit ADC;

with undervoltage protection, overvoltage protection, overcurrent protection, short circuit protection and thermal shutdown Various protection functions such as power-off protection; single chip completes charge/discharge control and supports various power conversions.