首先让我们了解下，我们这次设计的IC：BQ24086
以下是官方的介绍：
The bq24085/6/7/8 series are highly integrated Li-Ion and Li-Pol linear chargers, targeted at space-limited portable applications. The bq24085/6/7/8 series offers a variety of safety features and functional options, while still implementing a complete charging system in a small package. The battery is charged in three phases: conditioning, constant or thermally regulated current, and constant voltage. Charge is terminated based on minimum current. An internal programmable charge timer provides a backup safety feature for charge termination and is dynamically adjusted during the thermal regulation phase. The bq24085/6/7/8 automatically restarts the charge if the battery voltage falls below an internal threshold; sleep mode is set when the external input supply is removed. Multiple versions of this device family enable easy design of the bq24085/6/7/8 in cradle chargers or in the end equipment, while using low cost or high-end AC adapters.
设计时唯一比较奇怪的是，使用WEBENCH时好像没找到这个BQ24086IC，所以使用的是官方的原理图。
BQ24086（具有热调节的 750mA 单片锂离子/锂聚合物充电管理 IC）芯片。
