"John Larkin" wrote in message
...
I need to make -12 from +12, at maybe 500 mA, and all the obvious
inverting switching regulators suck for one reason or another.

The LM5112 is a 50-cent fet gate driver.

John

have you considered a MC34063A ?

might just do it wothout an external switch.
input range 40v, for voltage inverter just connect ic ground to neg op.

Colin =^.^=