You don't just need a driver, you need a decoder. Servo signals are 1.5ms center and 1ms and 2ms to either extreme repeated approximately 50 times per second. Best case scenario (2ms signal) this will only give you a 10% duty cycle, worst case (1ms signal) it will give you a 2.5% duty cycle, and the frequency isn't fixed (it's slightly variable depending on all of the other channels aggregate duty cycle plus the framing pulse) This is not a signal that can be used to drive a Mosfet directly.
You either need to use a pulse stretcher which coverts that short servo pulse into a simple PWM frequency (0-100% duty cycle at extremes) or use a micro controller to read the pulse length and drive the mosfet for you. Mosfet drivers usually have two purposes, one is for driving a high side mosfet because voltages greater than VCC are required to get a high side FET to switch on so a charge pump is usually used. The other is if you want to minimize FET transition losses by creating very sharp edged switching transients from perhaps a softer logic edge to avoid operating in the FETS linear range, which creates heat. Logic levels FETS are very common and for common voltages can be driven directly from the I/O line of a micro controller or from discrete logic.