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TPS25831-Q1: When Vbus is short-circuited to BATT

Part Number: TPS25831-Q1

Hi team

I have two question about TPS25831-Q1.

1. When Vbus is short-circuited to Vbat as the below, does TPS25831-Q1 have protection function?

   ( Vbat > Vbus , Vbat is about 12V )

2. What is the function of optional FET?

    Protection? select power switching? or which function?

Thank you