On 19/04/2011 12:34, alan.b.pearce@stfc.ac.uk wrote:
> I think you are in for two switchmode chips, one to do =B15V and one with=
 dual output synchronous rectifiers for 3.3 and 1.5V. If you want any reaso=
nable efficiency you will need a synchronous rectifier for the 1.5V as a mi=
nimum, the 3.3V you may get away with just a shotcky diode.
>
> Linear Technology have some chips which will fit both positions.

Thanks - I was actually just on their website, and there are a couple of=20
good candidates for the =B15V, I think will work out cheaper than two=20
separate ICs.
Two switchers does sound like the best option given what is available (I=20
was kinda hoping to find some magical 4-output buck/boost/inverting part=20
for less than =A35 :-)  ), although the price is driving things more than=20
size, so if I can do it cheaper with separate I'll go that way. I have=20
noted down a few 3.3/1.5 capable chips I've seen around, so I'll=20
probably spend another hour or so looking then make a choice.


--=20
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