The 7805-equivalent switcher I pictured was an experiment a while back, and is 
way to big to fit in my app.  I've not looked at Linear lately, but I 
remember they were quite expensive relative to other competitors and required 
a lot of external components, compared say, to National's Simple Switchers.

BUT -- the revelation now is that Semtech seems to have the right part for my 
app -- SC4517A.  It actually fits on my app (at 0.36 sq in of total component 
footprint using 0603 caps and resistors), and looks like it will come in 
under $1.50 in 1k quantities (all other components included in that price).  
I've ordered samples and coincidentally the FAE will be down in Florida near 
me tomorrow, so I'm meeting him for a bit.  I'll update once I know more.

Cheers,
-Neil.


On Monday 29 October 2007 03:56, Alan B. Pearce wrote:
> >What I'm running into with a lot of these, is that the
> >caps and inductors are relatively large, and that adds
> >cost and precious PCB space.  In this app, the 100uh
> >and 100uf's are the deal-killer for my app.
>
> Hmm, I have used some switcher chips from Linear technology, and with tiny
> low profile inductors from Coilcraft, would easily match that 7805
> equivalent that you pictured. With A size case tantalums and very small SMD
> resistors, you really cannot get much smaller with anything. Even using
> 1206 resistors it can be quite small.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist