I am converting an existing product to battery power (4 NiMH cells), and need 5V
out. given that the voltage can range anywhere from 3v to 6v (when the charger
is powering the unit) I need a recomendation on a single chip buck boost
regulator.

I actually need +5, -5, +12, +24.  The current product includes parts to
generate -5 and +24 from +5.

Would it be more efficient to generate +5 from the 3v to 6v input, and use that
for the other voltages (given that the +5 will be the highest current
consumption in the circuit), or would it be better to just boost it to +12, then
generate the other voltages off of it?  As with most battery products, current
consumption and regulator efficiency is more important than reducing parts count
(ie, it's ok to have the extra inductors required for the buck-boost if it is
more efficient than a simpler single inductor boost)

I'm going to look at maxim now, and have heard of another company called Sepic.
I also understand Dallas makes a few of these, and another company whose name I
forget, but part numbers start with HT.

Are there any other recomendations on either manufacturers or specific parts?

Thanks!

-Adam

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