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BQ2057C典型电路连接的电路

根据典型电路连接的电路图,为什么直接给手机充电时,充不进去电呢??电流450mA左右,输入电压5.10V,1.1A,输出电流450mA,,给电池充电,冲了好久也没什么反应,电量一直不变!!为什么??

BQ2057C.pdf