piclist 2002\01\31\183851a >
Thread: Turn off 3 pin regulator?
www.piclist.com/techref/index.htm?key=turn+off+pin+regulator
picon face BY : Russell McMahon email (remove spam text)



> >So what you need is some simple way to switch off the regulator and
> >have its o/p volts go to zero when it's OFF = when the npn tarnsistor
> >is OFF.

> But, really, it would be better to just use an LM2941 (in TO-220-5
> or TO-263-5) that has shutdown built-in, is LDO and costs about 85
> cents in 100's (adjustable output voltage).


The LM2941 has a regrettably high quiescent current in shut down mode.
The LM2936 cannot be shut down but has a much lower quiescent current  -
around 10uA in practice AFAIR - still too high in many cases.


       RM

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