> Perhaps someone already mentioned the *3063 which is the "advanced" 34063=
..
> http://www.onsemi.com/pub_link/Collateral/NCP3063-D.PDF
> $0.68 at 100 qty.

Unfortunately the 3063 is just a coat of paint and new wallpaper. The
basic core is largely unchanged :-(.
They say 150 kHz which the 34063 could do at a stretch.
The graphs say you can get maybe 300+ kHz from it.
Still the high 1.25V reference. Still the poor darlington output (used
to get switching "speed" as a non saturating and thus lossy switch.)
LM339 still looks attractive :-).

 R
--=20
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