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请问2节锂电池充电管理该怎么设计?

Other Parts Discussed in Thread: BQ24170

有2个锂电池串联的,电源适配器输入是12V3A的,想做个充电管理电路,

不接适配器时,由电池给系统电路板供电(系统电路板工作电流大于2A),

接适配器时,切换到适配器供电,同时适配器可以给电池充电。目前充电芯片可选很多,但电源自动切换觉得有点迷惑,请问这个电路该怎么设计?谢谢