I have a idea using Arduino to control power mosfets(CSD18532). After considered some problems about wiring power mosfets directly to Arduino pin, like considerable slow switching time, I turned to using a gate driver IC(LM5114) between Arduino and the power mosfet. I think I could use the picture below taking from LM5114 datasheet page 10 to used as my schematic. The VDD on LM5114 will wire to Arduino's +5 volts power supply directly, while the PWM wiring to Arduino pin.
I learned from a TI's appnote that when turning on/off power mosfet, the gate current is considerably large(I roughly searched the internet, and got answers like 1 amp or so...). So my basic question is that will it be ok for a USB powered device like Arduino to power the gate driver IC's VDD through its +5 volts power supply directly? I know that USB port can only source 500mA...
With this question, I found TI's LM5114 Evaluation Board's schematic on page 8. Although I don't know the schematic clearly, I found that LM5114's VDD directly coming from a 50mA LDO. I used the equation from previous appnote(page 9):
So the IG is roughly: (5 - 1.4)/2 + 1.5 + 1 = 800mA. Will the relatively large gate current cause damage to the 50mA LDO(LP2982)?