The LM5050-1 datasheet recommends against a standard level MOSFET:
The gate-to-source threshold voltage, VGS(TH), should be compatible with the LM5050-1 gate drive capabilities.
Logic level MOSFETs, with RDS(ON) rated at VGS(TH) at 5V, are recommended, but sub-Logic level MOSFETs
having RDS(ON) rated at VGS(TH) at 2.5V, can also be used. Standard level MOSFETs, with RDS(ON) rated at VGS(TH)
at 10V, are not recommended.
The charge pump can produce +12V over Vin when VS is 12V or greater. This seems like plenty of voltage for a standard level MOSFET with an Rds_ON that is rated at 10V.
When VCC is only 5V, the charge pump can only produce +7V over Vin. Are standard level MOSFETs not recommended because they would work poorly at low supply voltages, or it there something else to this?
Thanks,
-Derek
