Re: 5V regulator for batteries cheap efficient?

From: Ken Smith (kensmith_at_green.rahul.net)
Date: 02/12/05 

Date: Sat, 12 Feb 2005 17:08:32 +0000 (UTC)

In article <1108185958.959874.84180@l41g2000cwc.googlegroups.com>,
 <u035m4i02@sneakemail.com> wrote:
>I know I can't have everything, but I'm going to ask for it anyway.
>
>The circuit is 8 or so opamps, comparators, and logic circuits driven
>by +/-5 V. It will run on batteries. Is there a comparatively cheap
>(double the price? maybe triple) but more efficient regulator than the
>7805/7905 for this application? i don't want the batteries throwing
>all their energy into heatsinks and running out in 5 minutes. if
>switching, it's got to have decent noisefreeness. noise above the
>audio band is fine.
>
>Any suggestions? the lm2940 looks promising, but you folks probably
>know better...

If the input voltage is over 10V and the current is low enough, a switched
capacitor converter may the way to go. 

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