Two AA batteries in series gives me 3 V.

I'm thinking of going with the setup described on this page:

http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1042,C1033,P1468,D4253

It uses the LT1173-5 chip to get 5 volts from 3 volts.

I will use the 5 V to power my microcontroller, but I'm thinking of 
taking 3 V directly from the battery to power my LED's.

Does this sound good?

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