> Mark E. Skeels wrote:
>> But, if the MOSFET junction does not actually turn on when the circuit
>> sees correct input supply polarity,
>
> then using a FET is pointless since it could be better replaced by a
> Schottky diode.  Usually the reason for using a circuit like what you
> describe is to get around the diode drop.  However, at 12-24V in is that
> really enough of a issue for you that you can't tolerate a Schottky diode
> drop?  In other words, your spec is really 12.0 to 24 volts, and powering 
> it
> from 11.6V wouldn't work?

Not only that, but the input voltage range implies there is some sort of 
regulation of the applied input voltage, so I would also be surprised if a 
diode voltage drop could not be tolerated. 

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