I need a logic level SMT FET that can handle 1.5A (safety factor included, will probably only see 800mA) that I can use with my Pro Mini.
If I want the FET, which is acting as a switch, to be closed but I want to keep the Arduino in sleep to save power, can I just set the default output of the pin to be HIGH? I don't want it on all the time with a pullup, just on when the Arduino is on but still sleeping.
If I’m turning on a FET with a digital IO pin (3.3V) from the Pro Mini, is a FET with a Vgs (th) of 3V low enough or should I really be using a FET with a Vgs (th) of 2.5V?
I found a FET that seems to fit my needs but I’m confused by some of the datasheet vales. It says:
VGS(TH) = 3V MAX
4.5 V Rated for Low Voltage Gate Drive
Drive Voltage (Max Rds On, Min Rds On) 4.5V, 10V
Does the drive voltage mean the FET is fully on? How can VGS(TH) = 3 max when the drive voltage is 10V?