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LMR33620: SW-PGND spec violation at undershoot?

Expert 3040 points
Part Number: LMR33620

Hi team, 

Please take a look at the following waveform, seems big undershoot, looks like the perod of less than -3.5V for 5ns.

Datasheet section 7.1 specified that SW-PGND less than 100ns transients -3.5V to 38V. based on this, this is spec violation. 

Please let me know, and give me some advice how to improve undershoot.