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TPS563208: EN pin without 0.1uf cap will have ringing

Part Number: TPS563208


Thanks for your attention.

We have seen if we didn't put 0.1uf cap near EN pin of TPS563208, when pull up voltage(12V) rise from 0V, the EN will have ringing as figure below, if the 12V rail is not rise start from 0V, the EN pin will not have this ringing.

From the datasheet, I see this EN pin is a digital input, it should not cause this different, I'm concerning about the 12V rail have this ringing when power up from 0V, but this is hard to explain why the 0.1uf cap will works for EN ringing.

May I know your idea about this case? thanks.