Hello,

> > I might put a decent buck regulator on the main board that produces=20
> > about
> > 5.5 volts, then distribute that to each daughter board.
> <snip>
>=20
> Do you have any suggestions on which one?
>=20
> I liked the idea, since there is a big step down from 12V to=20
> 5V and energy is very precious in my application.

If energy losses over cable are not an issue for you, you can go with 5,5=
 master voltage.

But I would take 12V. That means lower current on the connections. On the=
 slave side, I would take a high efficient LT or micrel switcher (80%-90%=
).
Linear LDO=B4s are just a waste of energy ...

If you have power-supplies on every slave, and you connect them, please t=
ake care about ground and vcc loops between the boards to prevent any kin=
d of self-oscillation.

Best Jens


--=20
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