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TPS61378-Q1: TPS61378-Q1 spec about SW pin voltage range

Part Number: TPS61378-Q1

Hi team,

TPS61378-Q1 SW voltage range is -0.3V to 23V as below in datasheet. But our test result is much lower than -0.3V when check the undershoot. the pulse width under -0.3V is very short, refer to below measurements.
Is there any spec to define this pulse width which out of the voltage range?

I would like to ask if there is any risk with the current negative pressure?