MAX Gate Current IRF3205?

in datasheet the manufacture doesn't mention MAX Gate Current in IRF3205,
how can find out?

There is no such thing as a max gate current.
The gate is like a capacitor, when it is fully charged (depending on the voltage of course) the mosfet conducts.
The only thing you will find is the capacitance and the total gate charge given in nC

1nC means that if you give 1A to the gate it will take 1ns to charge
if you give 1na it will take a second
if you give 0.1A it will take 10ns etc.
nC it is time(ns) * current(A)

Alex

so accordin you explaination we can get every current to gate? it doesn't have maximum amount?

when using mosfets you have noting to do with gate current i never had of any thing gate current normally mosfet always conduct by applying vgs to it's gate but not current.

To put it simply, as long as you have a Vgs voltage that doesn't go over the rated voltage for that specific device then the more current you can give the faster the mosfet will switch on but usually it's the other way around and we use a gate resistor to limit the current drawn from the driver so that we don't overload the driver (unless it is a high current driver in which case you will not need a gate resistor).

Alex

---------- Post added at 17:00 ---------- Previous post was at 16:04 ----------

Also note that in a mosfet once the gate capacitor is charged the gate doesn't pull current any more (until you switch off the mosfet).
Once the mosfet is conducting , when you want to turn it off you need to discharged the gate capacitor, the faster you discharge it the faster it will turn off.
In simple switch application you may just stop driving the gate but when you are using a frequency of say 50Khz and you care about the speed you have to use a push pull circuit to give or pull current fast.
In addition when a mosfet is neither on or off and is in the between stage it gets hot because of the current multiplied with the voltage drop across the source-drain, when it is off you have no current and when it s on you have very small voltage drop (because of low on resistance).

Alex