you may also want to look into some of the high-side drivers or the gate drivers that do high and low-side drive. I could be wrong, but I believe that some of these can generate proper gate voltages to drive the transistors even with lower supply voltages.
on the other hand, if going with a voltage multiplier, I have personally made a voltage tripler with a single MAX1683 to go from 5v to about 13v and it worked just fine. their supply input range goes down to 2v so it could work for your application.