> A boost converter is what you need, I would suggest you 
> investigate the
> Linear technology website. The LT1071/LT1171 look like 
> they may do what you
> want, although you may need a couple running in parallel 
> to get the current
> level you want. The do also have an app note on using a 
> multiphase converter
> for very high power, which may be worth investigating.
>
> http://www.linear.com/pc/categoryProducts.jsp?navId=H0,C1,C1003,C1042,C1031&sort=1&direction=desc&action=SORT

The LT1071 is rated at only 2.5A
The LT1070 is rated at 5A.

Datasheet for either.

    http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1031,C1061,P1266,D2406

Some good application circuits in there.

Power rating is about 100W at 25 Vin.
Unusually high Vinmax of 60V makes it potentially suited to 
this job.

Note that the LT1070 is an ollllllllllllllldie but a goodie 
BUT the oldness means it is slow (as is the MC34063).
100 kHz.
Main result is a physically larger inductor is needed than 
if the more recent gee whizz chips are used.



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