I usually like National Semi's online Webench switcher design tool, as their
parts are usually lower cost and requires less support components than
Linear.  Linear however, seems to have switchers that run at higher freqs,
for smaller (and lower-cost) L's and C's, although I recently discovered
some newer (to me) parts from National that look promising for my apps --
LM2734, LM2736 etc.

I discovered a nice switcher by Semtech some time ago (SC4517), which
operates at a high frequency, requires few support components, takes very
little PCB space, and is priced quite low.  But it's only available in min
1k or 3k quantities IIRC, so I'm evaluating for a redesign of an existing
product.

Cheers,
-Neil.



Alan B. Pearce wrote:
> 
>>It needs to handle an input voltage between 20 and 50 volts, supply a
>>current of between 30mA and 500mA with an output voltage of 5 volts.
> 
> Personally I like the Linear technology range, but they do not have many 
> that would handle that input voltage.
> 
> So I would also recommend the MC34063 that Jinx suggested, as a rugged,
> well 
> proven, and available from several sources device. 
> 
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