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BQ25601: BQ25601 SYS output abnormal

Star Xu
Genius 9645 points

Part Number: BQ25601

Hi 

The customer design with BQ25601, the problem is when the battery is not connected, the VSYS voltage will fluctuate periodically.

What is the reason for this situation? As shown below:

Attached the schematic as below:

Please help check it.

Thanks

Star