Re: [uCsimm] Re: Power supply blues

From: Micah Dowty (
Date: Thu Mar 30 2000 - 13:16:20 EST

The things I like about these switchers (if they were to work correctly)
is that my battery voltage can drop to one volt before it stops operating,
and I doubt you'd find a linear supply that could generate -5v from two
AAA batteries!
BTW, it's "micah" not mitch

Micah Dowty

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On Thu, 30 Mar 2000, Uwe Hahn wrote:

> On Thu, 30 Mar 2000, Robert Poor wrote:
> > Uwe/Mitch:
> >
> > Just to clarify one point: Mitch is using switching regulators;
> > the TI part is a linear regulator. Since efficiency is the issue,
> > a linear regulator probably isn't the way to go.
> >
> > I've not worked with the MAX717 or 722, but with all switchers,
> > you have to pay close attention to the choice of capacitors (low
> > ESR), MOSFET, and circuit layout.
> Right. I know about the difference in design and power
> consumption, I myself am working on a battery-powered design
> which is supposed to be compact.
> The low-dropout design of the serial regulator I was
> referring to makes it a good alternative to the MAX parts.
> And they are _so_ easy to handle...
> Just my idea, but of course, if power consumption is the
> primary issue, you will not get around switching supplies
> and the somewhat tedious external component selection, I
> suppose. Thank you for the note, Robert.
> Greetings,
> Uwe
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