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BQ25570: BQ25570 VOUT Output voltage is unstable

Part Number: BQ25570
Other Parts Discussed in Thread: TPS62737

Hello my question is

I set the voltage output is set to 3.3V.My system is a BQ25570 powering a system(MCU) at 3.3V.  The system  is on the regulated VOUT net of the BQ25570 (on the buck step-down).

But sometimes the built-in Lbuck of bq225570 will have a voltage below 1V.

Sometimes using the meter to measure the voltage and return to normal 3.3V

The following is my circuit diagram TPS62737 is not on the piece