> > I'm looking for a 5V out switching regulator with a quiescent current o=
f<1
> > mA, capable of supplying 300 mA. It should operate across a wide voltag=
e
> > range, from 8V up to 32V, and be able to survive 36V. It must also be s=
mall,
> > and cheap.
....
> 8V to 36V is doable. Lets you use really flat 12V car battery or madly
> excited 24V Truck electrics.
>=20
> series transistor or linear regulator to power low power < 1mA SMPSU IC
> that uses one external FET switch.
> max of about 30mW in your series linear supply for SMPU IC and the
> external fet can easily do 0 to 500mA at even 60V in
>=20
> If you wanted it in one part with only a couple of caps and one coil I'd
> think that's harder.

IIRC Linear technology have some that will do 40V input, but I cannot remem=
ber the output current.

But my initial thought on reading Vitaliys original post was to go look at =
PoE supplies, but I suspect that are isolated between input and output.
--=20
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--=20
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