Thanks for the help, I think I'm going to use one of these instead (
http://www.micrel.com/_PDF/mic29150.pdf ) because it has a 'zero' power
off current draw and the shutdown facility (enable) works in the
opposite way (ie on when high rather than off) to the previous one, I
think!!??  Which should make my design easier.

Cheers
Ed

On 4 Nov 2003, at 05:51, Russell McMahon wrote:

> In 3 or 4 places I saw it say that output is OFF when shutdown pin is
> high.
> I coul;dn;'t see anything suggesting otherwise but may have missed it.
>
> The several diagrams at the end show the above in each case.
>
> The shutdown pin draws substantial current when off (at least 12uA *
> odd
> with care and more without care).
> There are regulators with MUCH lower shutdown currents.
>
> * Min shutdown current needs to get about 0.7v across 60k in
> shutdownpin cct
> = 12 uA.
> Actual will probably be more.
>
>
>         Russell McMahon

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