MarkT:
Its a language issue, a low-side driver drives a low-side switch, as in the OP's circuit. Every MOSFET driver
can source and sink large currents whether high-side or low-side.
Ahhh... now I see what you're saying. The IR2301 has both low-side and high-side drivers. As long as the OP uses the LO output, it should work.
ted:
...thas why I suggested repleace 150 ohm by 2K, those transistors are using voltage not curent for control, ......
Yes, but for high speed switching, there needs to be enough current drive to charge and discharge the Gate capacitance. But, that shouldn't be an issue in this case -- with the correct MOSFET choice. But a MOSFET driver will make this moot.
Ppl39:
If I use the IR2301 driver do I even need the buck converter? Couldn't I just supply it with the 12v?
That should work. The IR2301 is good for up to 20V -- but, check to be sure the MOSFET [that will be driven by the IR2301], is designed to handle 12V at it's Gate.