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TPS25940-Q1: why the FLT pin is low level when without input?

Part Number: TPS25940-Q1



I'm curious that why the FLT pin is low level when without input voltage? From my understanding, the internal MOS need gate voltage to conduct, without input, TPS25940-Q1 will not work, the FLT pin will high level.

So, could you tell me why?