Re: 5V regulator for batteries cheap efficient?
From: Brian (brian_at_w3gate.com)
Date: 02/14/05
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Date: Mon, 14 Feb 2005 01:53:23 -0600
"Ken Smith" <kensmith@green.rahul.net> wrote in message
news:cum1ua$lhf$7@blue.rahul.net...
> In article <1108227866.479654.115350@c13g2000cwb.googlegroups.com>,
> <u035m4i02@sneakemail.com> wrote:
>>I'd estimate about 65 mA total.
>
> 65 mA is enough to make a switcher worth the work. If you don't need too
> tight of regulation, you can use one chip to make both voltages. This may
> save you a bit of power. Something like this:
>
>
>
> --!!---------------+--->!---+----- +5V
> ! ! !
> ! [L] ---
> ! ! ---
> ! ! !
> (+)-----[L]----+---+--!!-----+-->!--+--+--------+------ GND
> ! ! !
> Floating / switcher ! ---
> Battery ! chip [L] ---
> ! ! !
> (-)------------+-------------+------+------------------ -5V
>
>
> You may even be able to find the inductors almost all as one part. IIRC.
> J.W. Miller has a multiwinding inductor.
>
> The input side inductor could be part of that plus a small independant
> choke
> in series.
Wouldn't the added efficiency depend on what his input voltage is? If only
6 volts (4AA) a switcher would offer little, no?
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