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TPS2412: No Vdd, but pin C has power

Part Number: TPS2412

All,

  I have a question about TPS2412 Vdd pin. Pin C (pin 6) connects a 12V always existing. Vdd (pin 1) ties same 12V source with a switch to turn ON/ Off.

if Vdd pin is turn off (no 12V source), is there leakage current from other pins? and what's gate voltage?