On-Semi NCP1421

Highly integrated, efficient and relatively inexpensive. Digi-Key and
Mouser (I believe) stock them.

http://www.onsemi.com/pub/Collateral/NCP1421-D.PDF

I like these parts a lot, they work well for either single or double 
cell step-up applications. I just designed it into a single cell AA
powered, handheld medical device.

Matt Pobursky
Maximum Performance Systems

On Mon, 8 May 2006 11:58:44 +1000, Zik Saleeba wrote:
> I'm designing a handheld navigation device. It's a prototype for a 
> device which may or may not become a production item at some time in 
> the future, but for now it's basically a hobbyist effort. I'd like
> to power it from two NiMH AA batteries and I need supply rails of 5V
> and 3.3V. The current required is pretty low under 100mA on the
> Battery life is a consideration, as is size.
>
> Does anyone have a preferred switching regulator to use in this 
> application? The main limiting factor is that relatively few boost 
> switchers will operate from the 2.4V I'll be getting from the 
> batteries.
>
> Thanks,
> Zik
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