It's always so annoying to invert yourself a new power supply rail to supply those high-side MOSFETs. And how much does it need? Average? Peak? Microamperes or amperes?
Well the gate is a capacitor, why not recover some energy from it? Hmm, could run a boost converter, but running one for sub-microsecond bursts would be weird... How about just tacking an inductor on it, eh? Well, then it'll resonate from its initial position to something swinging up and down around a power supply rail. Let's clamp that flyback with a diode, dumping the inductor's energy into the supply rail. With some keen drive, I can see it running pretty low average current. Instead of a lossy resistor, you have an inductor controlling rise/fall time. With a CMOS sort of driver, I bet you could get consumption under a miliamp, using a weedy flying capacitor supply for it.
Tim
-- Deep Fryer: A very philosophical monk. Website @