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LMZ31530/about layout of PH(Pin 71)

Other Parts Discussed in Thread: LMZ31530

Hi,

Could you tell me about LMZ31530 layout design in data sheet Page20-21?
PH pin (Pin 71) pattern is disposed in all the layers.
What are the reasons to recommend this layout?
LMZ31530 data sheet layout.pdf
Customers are trying to prepare a GND layer immediately below the PIN71.

Please tell me the concern.

Best Regards,
Yusuke/Japan Disty