要求可以应用外部适配器(手机充电器购买)给锂电池充电(3.3V)同时可以给系统供电(整个系统要求3.3v),充电时由外部手机充电器供电锂电池不供电,当拿下适配器时锂电池供电供电,请问有没有合适的芯片可以选取,
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