Yeah, that was just an "off the top of my head" suggestion as I'd=

used that family of parts in the past. I believe that Maxim has
some LDO's that use significantly less quiescent current. Toko
would also be a good source to explore. As I recall, the reason
we used the T.I. part was that the Iq was not a problem (we were=

shutting down the regulator and when it was running the load
current was ~20mA, so the Iq was a negligible percent) and it was=

cheaper than anything else available at the time.

There are some very good parts out there these days specifically=

targetted at extending battery life. I'll bet you can find a good=

one that will fit your operating current requirements. Good luck=

in your search.

Matt Pobursky
Maximum Performance Systems

On Thu, 21 Feb 2002 08:43:41 +1300, Paul Gaastra wrote:
>
>I liked Matt Pobursky's
>suggestion of that TI TPS7250 low drop out regulator except=
 that
>its quiescent current is 180uA.  My circuit draws 290uA on
>average so I think the two diodes would waste less energy
>(haven't done the sums).  I see that it has a 0.5uA sleep state
>so maybe I could work out something
>there.

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