Roy,

How about a pt78st105 integrated switching regulator from TI (Power trends).
Here is a link:
http://focus.ti.com/docs/prod/folders/print/pt78st105.html

Vin 9V-38V  Vout 5V. Iout 1.5A. 3pin SIP package with pinout similar to a
TO-220, but a bit wider package.  Vertical or horizontal mounting.

I've used these and the 3.3v variant with great success.  A real nice part.

Hope this helps.

Dave Challis

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Roy J. Gromlich
Sent: Sunday, December 19, 2004 11:47 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE:] Is this going to die?


This brings up a question I have been meaning to ask here - I have been
looking for a Switching Regulator which will replace a 7805 product in a
TO-200 package. It's not that I need the full 1Amp 
output - I do need to drop 12V to 24V down to 5V to power a 
card which will pull about 150mA MAX.  Worst case is dropping 19volts @
150mA which is 2.85 Watts - that's a lot of power to throw away to get 0.75
watts.

The board was designed with a TO-220 standing up and thus 
taking very little PCB realestate.  While there are small switching
regulators which will do this, they are invariably in DIP packages. There is
simply no way to get a 16-pin DIP in the place of a 
TO-220.

Has anyone seen such a device?  A switcher in a TO-200 which can deliver 5.0
volts @ 150mA from 12V - 24V? It certainly seems like a product many people
would have a use for.

RJG




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