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TPS22968: Why do TPS22968 have second conduction when power down?

Part Number: TPS22968

Hi Team,

Our customer connect BIAS to VIN, which is normally 3.3V. When doing power down test, after detect Vin lower than 2.5V, ON pin will set to LOW to disconnect the circuit, so BIAS will lower than 2.5V during the test. But we find a second conduction of the load switch, could you help to comments why TPS22968 have this behavior? Thanks.

Blue: VIN

Green: Vout

Pink: ON.

time data between first disconnect and second conduction: 127ms.