For example looking at IRL3803 the total gate charge is 140nC and turn on is 14ns, so this is worse scenario than previous one, peak is now 10A. If its a mosfet driver with 1,5A, it needs a resistor in line with gate to limit the peak current at 1,5A. But this resistor will make the rise time slow, and that is not so good. The point in using mosfet driver was to make it as fast as possible, to make mosfet transition fast in its triode region and thus minimize the losses of it being only partly opened.
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