Giles,

Take a look at TI's TPS line of low dropout, low quiescent=
 current linear
regulators. The TPS line in particular is very efficient, quite=
 low cost for
the performance, and generally availability is very good.

I've used a bunch of them for handheld battery powered devices in=
 real products
and had no problems with them. The TPS76950 might fit your=
 application very
well.

http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumb=
er=3DTPS76950

If not, TI has a BUNCH of very good alternatives with various=
 packages, output
currents, output voltages and quiescent currents.

Good luck. You should be able to get a standby current of 20uA or=
 less with a
good low dropout micropower regulator. Make sure you read the=
 applications
information and follow their circuit layout guidelines too!

Matt Pobursky
Maximum Performance Systems

On Fri, 24 Aug 2001 10:13:45 -0500, Giles Honeycutt wrote:
>Hmm, I am looking at the LP2980, thanks for the tip.  I notice=
 it has a lot
>more current draw than a sleeping PIC.  I guess I will do a=
 little math and
>see how long a few uAmps will last on my tiny batteries.
>
>Best regards,
>Giles
>
>>I use either the Seiko S81250 or the Nat Semi LP2951.
>>Both have a dropout between 0.04V and 0.350V (depending
>>on load), up to 12V input and quiescent current around 50 -
>>70uA. Easy to get, cheap, good for battery supplies like 6V
>>gel cells
>>
>
>
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