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BQ24133: BQ24133 charging voltage abnormal

Part Number: BQ24133


The customer design with bq24133, they set the cell to VREF, but the SW output voltage only 8.5V, and the STAT is blinking.

the schematic as below:

In 9.3.9, except that the delay of 1.5s has not been measured, it meets the requirements

Which will impact the SW output?

Waiting for your reply.