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5V供电,对两节锂电池充电(升压型充电芯片)选型

Other Parts Discussed in Thread: LM2735, BQ24170, TPS61087, TPS61088, TPS61175, BQ24133

5V供电,对两节锂电池充电(升压型充电芯片)选型 ?    

如果没有此类芯片,那么有没有大概实现方案推荐(升压——Buck降压充电)?