I need to come up with as simple a DC-DC converter as I can. There are a TON of chips out there that make nice simple converters, but I my problem is high/wide input voltage and space. It needs to be small and, hopefully, simple.
Vin: 20-75V (15V-75V would be even better)
Vout: 12V +/-5%
Iout: ~1A would be about all I would need. But 600mA should suffice if I can't get to 1A.
Ripple: Very low ripple isn't all that important. The AVR will be running behind a secondary 5V linear regulator.
Isolation: non-isolated. Design shares a common ground.
I could go linear using an LT3014B with an NPN pass transistor to handle current, but there's no way even a D2PAK transistor could dissipate enough power given my space requirements.
I've done some searching, but I might not be looking at all the options. Do you gurus have any additional thoughts?