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bq2057锂电池充电问题

Other Parts Discussed in Thread: BQ2057C

现在在设计充电器:使用的TI的BQ2057C芯片,电路按照经典电路搭建,遇到问题如下输入为5V时候,输出电压不稳电压值为4.45~4.49或跳变至4.38、4.20左右!请各位大侠多多指点!附有原理图,PCB图!

原理图PCB图.doc