12v switching ChipFet with a 3V gate?
Use another FET, probably a N-Channel to switch the larger P-FET on and off. This topology is called a load switch:



Select R2 first, around 100ohm to 1Kohm, and R1:R2 need to be in a 1:10 to 1:100 ratio. Q1 being a logic-level N-MOSFET, and C1/R2 providing a slew rate limiter. R1 pulls Q2's gate to the bus voltage, and when Q1 turns on it pulls Q2's gate to ground, turning the switch on. Only Q2's S-D sees any significant load.

Also this isn't intended to be switched from PWM, it's more of a "power-on/power-off" application switch.