I'm looking for N-channel FETs for a PWM based regulator. To reduce heat dissipated during switching events I want to use an FET that can be turned on and off as fast as possible. When comparing FET specs, what affects the rate at which the FET can be turned on or off?
I thought it was the Total Gate Charge (specified in nC @ a given Vgs), but then there's input capacitance (usually in pF at a given Vds).
Given 2 FETs whose Vds is sufficient and the same FET drive, what spec should I look at regarding how fast the FET can switched? Which one is "faster", one with the lower Gate Charge or lower Input Capacitance?