Jason White wrote:
> Im considering ordering the
> MIC2951<http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=576-1150-ND>its
> one of the cheapest dip regulators they have. I use (as stated before)
> the PIC 16f690.
>
>
>   
that needs 5.5 to 5.6V to give 5V out.

It's a LDO linear regulator. Though the regulator I posted earlier may 
only be a step down switcher. You need  switching regulator that can 
stepup or step down to have +5V

though you could run the PIC on 4.3V via  zener + resistor (not very 
efficient)

Download some PDFs from here and read them 
http://www.linear.com/pc/solutionDetail.jsp?navId=H0,C2,C1185,C1780

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