DRV8350: Question about the charge pump

Hi Team,

I see that Ivcp will limit the choice of MOSFET (related to Qg) I wonder why this is? Why is there such a relationship between the drive capability of MOSFET and Vcp.
In addition, what kind of relationship does this have with the current of Idrive up to 1A of SGD? (Where does the current of Idrive come from?)

Thanks!

Jenson