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BQ25121A 是一款高度集成的电池充电管理 IC，集成了可穿戴设备的常用功能：线性充电器、稳压输出、负载开关、带计时器的手动复位以及电池电压监视器。该集成降压转换器是一款具有低 I Q 的高效率开关，采用 DCS-Control™ 技术，可进一步提高轻负载效率，负载电流可低至 10µA。运行和关断期间的低静态电流有助于延长电池寿命。该器件支持 5mA 至 300mA 的充电电流。

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible 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 charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization. A simple voltage based monitor provides battery level information to the host in 2% increments from 60% to 100% of the programmed V (BATREG).