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TPS62090: Absolute minimum rating of SW pin (1/2pin)

Part Number: TPS62090

When the output waveform of SW pin (1 / 2pin) was confirmed, the Low side was
It was about -0.4V, which exceeded the absolute maximum rating of -0.3V.

Could you tell us about the following two points?

1.
Since it is an absolute rating, it is recognized that it should not be exceeded.
Absolute rating: -0.3V must be observed?
The #SW signal is output by TPS62090, so it is difficult to improve.

2.
what can happen if the absolute maximum rating of -0.3V is not adhered to?