look at this circuit:
I don't get that what's the usage/purpose of the BAS316 in this circuit?
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One purpose for that diode is to block a leakage current path if the +3VRUN rail is powered up but that the +5VRUN rail is not powered up. Allowing an unpowered rail to get leakage current from other powered circuits can lead to operational problems and potentially result in severe latch-up in circuits referenced to that rail when they become powered.
Michael Karas
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This must be the answer that I'm searching for! thanks. – Roh Jun 10 '16 at 05:04