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On 07/09/2010 17:31, Bob Blick wrote:
> I've used the Maxim MAX710 for years and it's a nice part. So far it's
> always been available, and the price is OK, about $5 in small
> quantities. But I'm always open for something better.
>=20
> What I need is a regulator that gives me 5 volts out for 4 to 6 volts
> in. Output current less than 300 mA. When it's off, output needs to be
> off and input drain no more than a few tens of microamps.
>=20
> The MAX710 has a boost regulator followed by a linear low dropout
> regulator. For my purposes it has been more efficient and no more
> expensive than a SEPIC converter when you consider the extra inductor or
> clever transformer plus extra capacitor.
>=20
> I'm open for two-chip ideas, too.
>=20
> If anyone has found a good solution, "I'm all ears".
>=20
> Thanks.
>=20
> Bob
>=20
>=20

How much less than 300mA? You may find success paralleling charge-pumps
to supply a low enough output impedance.

I'm pretty sure TI has a boost-ldo chip somewhere, though I'm not sure of
the cost.

- --=20
Brendan Gillatt | GPG Key: 0xBF6A0D94
brendan {a} brendangillatt (dot) co (dot) uk
http://www.brendangillatt.co.uk
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