Re: Very Low Power Switched Mode Power Supply

Robert Baer wrote:
Joerg wrote:

Mike Harrison wrote:

On Sun, 27 Apr 2008 07:34:19 -0700 (PDT), stevenwrig@xxxxxxxxxxx wrote:

Hi,

Does anyone know of a Switched Mode Power Supply that will operate on
really low input voltage, say about 1 or volts and has no constraints
on power output?

Steve.


Texas TPS61200 - 0.3v min input



But watch out, IIRC it's 70uA quiescent, taken from the output cap. I wrote TI support a while ago about some tricks and whether they'd be kosher. Well, that was a couple months ago and I could not even get tech support to answer. Four (!) reminders, four promises to get back to me "soon", then zilch. That tells me something I'd have to keep in mind for future design decisions ...

Hello TI, anyone listening?

Well, if ter is a reasonable market for your improved design, get some fab house to make them and then undersell TI and market as "!Banned by TI!".


IMHO there isn't much of a market (yet). But there certainly won't be one developing if you can't obtain important info on available chips. Anyhow, most people in this field do that the old fashioned way. That would be a small helper circuit with a JFET and then a traditional switcher. If PHEMTs and stuff would be lower in cost we'd use them. But they cost a lot so mostly it's jelly-bean JFETs.

--
Regards, Joerg

http://www.analogconsultants.com/

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