> Dwayne,
>=20
> Really it got too complicated, so I researched some more and found a good
> solution using three ICs:
>=20
> 1) LTC4088: Switching lithium battery charger with synchronous rectificat=
ion.
> Also integrates most of the discretes needed for power steering.
> US$4.88 @ 1, US$2.59 @ 100
>=20
> 2) PAM2401: Switching step-up converter with synchronous rectification fo=
r
> producing 5V.
> US$1.08 @ 1, US$0.76 @ 100, US$0.47 @ 1000
>=20
> 3) RT6150: Switching buck-boost converter (also with synchronous
> rectification) for producing 3.3V.
> US$1.28 @ 1, US$0.89 @ 100, US$0,69 @ 500
>=20
> This is the best balance between price, board area and performance I coul=
d
> find.

Well, that led me down a half hour black hole as I had my afternoon cuppa .=
...

Hadn't come across Richtek before, they look like nice devices. Overall I t=
hink you have a workable solution for your requirements.



--=20
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