> what specs "several times" have you looked at?
>
> 21395b.pdf "TC125/TC126 PFM Step-up DC/DC Regulators" tells
> about fixed voltages 3.0V, 3.3V, 5.0V. and others for the
> next apps:
> Palmtops/PDAs, Battery-Operated Systems, Cameras, Portable
> Communicators.
>
> Start-up at 0.9V.
>
> What's wrong with this applications?
> Don't they need to be powered from one or two cells?
>
> 20MHz PIC powered from one cell, why is this ridiculous?

Certainly there are applications where all the analog voltages are less
than 5.5V, but that's much more limited than 12V or +-15V, for example.

I was mostly thinking of the opamps and voltage regulators.  For example,
I just don't find a lot of use for a TC1262 5V linear regulator.  It has a
*typical* 350mV dropout and a max input voltage of 6.0V.  That leaves a
whopping 650mV input voltage range from 5.35V to 6.00V.  That's like
claiming a perfect mousetrap by redefining the standard mouse.  Maybe
there's a circuit out there where that's just the right fit, but I haven't
come accross it yet.


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