I'm using a mosfet for powering an Arduino mega 2560 on and off. The current drawn is less than 500mA with a 12V battery.
I chose the IRF7457Pbs (RS 543-0888), with these features:
VDSS - 20V
RDS(on) - 7.0mΩ
max ID - 15A
I measured the voltage drop on D-S:
- Vin=9.40, Vout=7.55
- Vin=12.15, Vout=10.24
This is too high for the mosfet specifications.
I'm using the mosfet driver UCC27517DBVT, (RS 774-1367), with Vdd=12V, IN+ TTL logic level from Arduino. The resistor at the gate is 5.1 ohm.
Why is the voltage drop too high?