> You can also look for circuits/app notes around the MC34063, a
> venerable SMPS controller IC (I'm not recommending you use
> it, but its simple functionality is certainly a useful starting point)

It's versatile. Buck, boost, buck-boost and invert in a cheap 8-pinner.
Not as efficient as some newer revisions of the topology, like the
NCV3063

http://www.onsemi.com/PowerSolutions/product.do?id=NCV3063PG

but OK for general purpose

http://www.onsemi.com/pub_link/Collateral/AN920-D.PDF

has more operational theory than the datasheet

http://www.onsemi.com/pub_link/Collateral/MC34063A-D.PDF

wbr
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