Driving a 7805 or how else to get +5VDC reg (was Re: My first good find!!!)

From: Jim Kearney <jim_at_jkearney.com>
Date: Fri Dec 6 15:19:01 2002

>From: "Ethan Dicks" <erd_6502_at_yahoo.com>
> How can I take +6VDC of battery power and get +5VDC regulated power
> from it? If it matters, the currents involved will be under 1000mA,
> but probably over 200mA.

The 7805 is an _old_ design. A modern LDO (Low Drop Out) regulator like an
LM2940 can maintain 5v out down to around 5.5v in.

Of course with many types of batteries you have the problem of voltage sag
as they discharge, and then you would need some kind of buck-boost (DC-DC)
converter to maintain 5v.
Received on Fri Dec 06 2002 - 15:19:01 GMT