This looks like it will serve my purpose well -- must
get a couple and experiment.  Wish they had a smaller
package for it though.  :-(

Cheers,
-Neil.




-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Edson Brusque (listas)
Sent: Friday, May 31, 2002 3:07 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: Low-dropout regulator...


Hello Neil,

> Ahhh... and therein lies the confusion.  Yes, I am
> aware that one feature of these is that the Vin to
> Vout differential is low.  Other than with a DC-to-DC
> converter (large), someone mentioned that LDO's are
> very efficient, so that led me to an implication
> that they won't create the heat that the 7805 would.

    I'm using the LM78S40 from National and I love it. It can work in book,
boost and inverting configurations. Have an internal transistor to 1.5A peak
and even a small diode and an opamp. If you need more current, you can use
external diode and transistor.

    It's in production for a long time and is widely used. Very cheap for a
switching regulator.

    Best regards,

    Brusque

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Edson Brusque                 C.I.Tronics Lighting Designers Ltda
Researcher and Developer               Blumenau  -  SC  -  Brazil
Say NO to HTML mail                          www.citronics.com.br
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