如题,OTG设备需要在插入USB-HOST时,从VBUS获取系统电源以及电池充电。在插入USB-Device时,从电池获取系统电压,同时将电池转成5V输出到VBUS。
为了满足电池续航时间, 要求电池放电以及转成VBUS-5V电压的效率要高
追求成本,性价比。
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