Buck Boost reg?

[Guest]

Hi,

My first real poject using PIC and CCS, I'm looking to create a battery powered GSM project using a SAFT 3.9v 16amp battery, looking for some advice on a low external component count buck / boost reg capable of keeping the 3.9v output as long as possible

Am I right looking at buck / boost or is there a better way

Thx in advance

P.S. Need shutdown pin.

[kender]

[SherpaDoug]

Pure buck or pure boost is easier. The worst case is to have your battery voltage vary through your output voltage. Avoid it if possible.
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