i hope someone can help with this ,i need to build a voltage doubler that can double 3.5 volt dc to 7volt dc and can supply 80ma of current and in as small a footprint as possable thanks in advance

 

TI Simple switcher LMR62014X
121 mm^2 is about .43 inch by .43 inch.
http://www.ti.com/ww/en/simple_swit.../index.html?DCMP=simple_switcher&HQS=switcher

 

Check this out:

http://www.youtube.com/watch?v=VWi0b5LQ6Jg