I want to drive a LowSide MOSFET switch. No switching speed needed here.

With a 3.3V µC input on the driver, the MOSFET shall sink current.

I have a npn/pnp stage here. When µC output is HIGH (3.3V), Q2 sinks current, Q1 is activated and the gate of M2 charges up. -> MOSFET ON. When I switch µC output to off, Q2 and Q1 turn both off, and the gate discharges through R6. -> MOSFET OFF. The advantage of this circuit is that it does not consume power, when MOSFET is off.

Is this driver circuit OK? How to correctly dimension R12 and do i need additional resistors somewhere?

Thanks cyrus

I want to drive a LowSide MOSFET switch. No switching speed needed here.

With a 3.3V µC input on the driver, the MOSFET shall sink current.

I have a npn/pnp stage here. When µC output is HIGH (3.3V), Q2 sinks current, Q1 is activated and the gate of M2 charges up. -> MOSFET ON. When I switch µC output to off, Q2 and Q1 turn both off, and the gate discharges through R6. -> MOSFET OFF. The advantage of this circuit is that it does not consume power, when MOSFET is off.

Is this driver circuit OK? How to correctly dimension R12 and do i need additional resistors somewhere?