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LM27402: LM27402 negative voltage on LG

Part Number: LM27402

Hi Team,

I have 2 questions when using LM27402.

Q1: Datasheet says the minimum voltage on LG can't exceed -0.3V, while both customer board and EVM show around -1V (period 4ns) at the beginning of turning on Low Side FET as below.

Obviously, it exceeds the datasheet spec. Could you help explain it why it has undershoot to -1V at the beginning of turning on time? Since EVM also has this phenomenon, is it normal? if it can have negative overshoot, what the maximum allowable time?

Q2: What's the Absolute Maximum Ratings for HG? it doesn't shown in datasheet.

Thanks a lot.

Best regards,