>> Would this be a diode going from Vin to Vout with the cathode
>> at Vin?

> Yes. Such a circuit is generally in the datasheet

Yes - but if there is no Vin the output will now be loaded via the
diode path.Depending what else is connected to Vin this may cause
problems.  You could then feed Vin via another diode so that direct
application of 3.3V to the regulator output then 'floats' the whole
regulator. Some thought as to secondary effects would be wise.

Note that a diode in the ground pin may cause decrease in regulation quality.

Using a reverse bias protected part is probably the "purest" solution.
- see my next post.




              Russell
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