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TPS65381-Q1 PGND and GND pin difference

Other Parts Discussed in Thread: TPS65381-Q1

Dear Experts,

    I have a question regarding to the ground pin of TPS65381-Q1.

    What is the difference between PGND pins and GND pins?

    I am designing a control board for automotive application, shall I connect PGND pins directly to "Vbat-" and GND pins to "digital ground" ?

    Any suggestion?

    Thank you very much.

Best regards.

Ma