> I suggest you browse the linear Technology selector. http://www.linear.co=
m/index.php They do a whole heap of buck and boost devices, and I would be =
surprised to find you couldn't match your specs there.


Agree.
Digikey are also reasonable useful for comparisons.

2 cells will be easier to get a given efficiency from than one.

Synchronous recitification is highly desirable when high efficiency is
wanted under demanding conditions (especially for relatively low
Vout.)

Be careful of efficiency claims. Figures like "> 80%" often apply to
very specific Vin, Vout and load currents.

If you value hi efficiency Z at both low load  and high load look at
pulse skipping designs - especially those that transit to such a mode
under low load.


          Russell
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.