Regulated DC Step-up Convertor with variable output voltage.

[royalmp2001]

Correct me but I don't think such a thing exists as a chip.

I want to use a 9v battery to get a variable 9-14V regulated output,
but sticking a regulator on the end of a chip step-up convertor doesn't
seem too efficient.

Anyone know of a chip that will do the whole job that requires just
connecting up a pot to control the output voltage? I don't need much
current, say 20mA.
Thanks

 

[ehsjr]

Correct me but I don't think such a thing exists as a chip.

I want to use a 9v battery to get a variable 9-14V regulated output,
but sticking a regulator on the end of a chip step-up convertor doesn't
seem too efficient.

Anyone know of a chip that will do the whole job that requires just
connecting up a pot to control the output voltage? I don't need much
current, say 20mA.
Thanks

Check out the TL499. When used as a step up
DC-DC converter, the regulation is in the switcher.

You do need to add a pot, a couple of resistors and
caps, and an inductor.

Ed