It was suggested in "Select power supply voltage using MOSFETs" that a second MOSFET can be added in series to prevent reverse current flow.
My question is, can I just reverse Drain and Source on the switching MOSFETs and not need extra MOS or diode?
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Answer
If you just reverse Drain and Source then in normal operation the body diode will conduct, even when the FET is switched off!
The solution is to wire two FETs 'back-to-back' so that their body diodes are in opposition, like this:-
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