Have you tried Webench (www.national.com)?  Most of the DC-DC  
converters I've used have been created with this tool, and I remember  
seeing chips that handle 20A and more, though I can't remember which  
specific topologies those were.  What I really like about it is that  
it does the design for me, is very simple (their Simple Switcher line  
has a really low component count), and (mostly) works as advertised.   
I have tweaked some values to reduce ripple, etc, but in general it's  
saves me a lot of design time when I only need to build a dozen of  
something.  And National's tech support always gets two thumbs up from  
me.

Cheers,
-Neil.


Quoting Jinx <joecolquitt@clear.net.nz>:

>> Alternately, many folks seem to have success with small toaster ovens
>> and/or electric skillets. Not sure how many have done that with high
>> pin count LGA, though.
>
> In an ideal world if one pad gets soldered then you'd expect all of them
> would. Given that each IC is US$30+ and it'd take two in parallel to get
> the output amperage with some headroom it's not an experiment I'd like
> to fail too often ;-) !!
>
> Having a look at the LTC3780 as well
>
> http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,P10090
>
> A simpler cheaper IC using external FETs. Have to check with the client
> but I'm wondering if this converter will be running mostly in boost mode.
> ICs I've looked at so far do better re amps in buck mode. Low voltage
> from solar or turbine generally means low amps, which fits with the lower
> boost capability. At the high VA end a shunt might be acceptable if there's
> unusable excess, but if boost and buck are in the same package for the
> right price I'd go that way
>
> Also asked Linear techs for their advice. Will probably trawl though the
> Maxim site, although most industry power supplies I come across have
> Linear ICs
>
>
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