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求助电源芯片选型



       大家好,我们最近需要做一个4.2V 2500mAh的锂电池充电方案,因为防爆要求必须外接三个二极管,所以在充电芯片选型上需要帮助,充电方案原理图在附件中。要求:

充电芯片或者电路能够在4V左右的输入电压下完成对锂电池的充电,如果有合适的选型,最好能够实现充电时由充电器供给外围电路的方案。