AVR-Chat

----- Original Message -----
From: "jay marante" <jaythesis@yahoo.com>
To: <Avr-chat@yahoogroups.com>
Sent: Monday, April 05, 2004 18:27
Subject: Fwd: RE: [AVR-Chat] sleep mode in mega16


>
> --- jaythesis@yahoo.com <jaythesis@yahoo.com> wrote:
> > I think it only consumes a small amount current
> since
> > i only an LCD and a keypad. Whats a DC-DC convrtr?
> Any
> > particular device i can order?

DC-DC convertor is another term for switch-mode power
supply.

Numerous companies make switch mode power supply chips, off
the top of my head, Texas Instruments, National
Semiconductor, Linear Technology, Phillips, and Thompson,
for starters.  I'm familiar with Linear Technology, and have
used these parts in the past:

http://www.linear.com/pdf/lt1305.pdf  This part will boost 3
volts to 5 volts using the circuits shown.

http://www.linear.com/pdf/1174fds.pdf This part, depending
on how you connect it, will raise 3 volts to 5 volts or
lower 9 volts to 5 volts without great loss (no where near
as much as a linear regulator).  In addition, it has a
shutdown control which effectively turns the device
completely "off" (less than 10uA leakage current), and a low
battery indicator.  There is one intersting circuit that
produces both +5 and -5 volts from the same 9 volt battery.

Lots of application circuits are shown, in some cases with
exact partnumbers and vendor names.



www.linear.com  (home page)


Erikc  - firewevr@airmail.net
///
"An Fhirinne in aghaidh an tSaoil."
"The Truth against the World."
        -- Bardic Motto