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LM27402: LM27402 negative voltage on PIN15 HG PIN & PIN13 LG PIN 2

Part Number: LM27402

Hi Support team 

may i have your kindly help to provide the negative voltage rating on PIN15 HG PIN  & PIN13 LG PIN 2, I can not find it on D/S

BTW, as you can see on following waveform, the SW to GND is around -5.38V, the number is over the SPEC (-3V), but the time period is short and around 9.5nS

the time period from D/S is -3V at 20nS

may i have your kindly judge if it works?