AVR-Chat

Yes, from almost any company, although Linear Technology is a bit harder
since you will need to go through a factory representative (a "rep" for
short).  TI and ADI are relatively easy.  With TI you just go online and
answer a few questions and they will send you five pieces of just about
anything.

 

Again, please don't abuse this privilege okay?

 

TI does make some nice DC-DC converters but make sure you can get it in
a package you can work with.  I'm using the TPS61027 right now which is
a WONDERFUL part (can step up 0.9 volts to 5 volts and even drop 6.5
volts down to 5 volts) but it's in an MLF type leadless package with a
solder thermal pad and the only effective way to work with it is to
solder reflow the part.  Most people are not equipped to do this kind of
work.

 

Barry

 

 

-----Original Message-----
From: jay marante [mailto:jaythesis@yahoo.com] 
Sent: Monday, April 05, 2004 5:53 PM
Subject: Re: RE: [AVR-Chat] sleep mode in mega16

 

can i order a free sample from linear technology?

 

the system only consumes a small amount of current since im only connec
a 4x20 LCD. but later i'll connect a motor to the system. so for now, i
think it only comsumes a small amount of current.

 

-jay

erikc <firewevr@airmail.net> wrote:


----- 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

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