Sorry for the delay, was out of town this weekend. It's a TI chip, part number DCP021212P. There are lots of other listings too, this is just the one I felt would work best for me. Search on 'dc converter' at digikey.com, then select dc/dc converters. From there it gives you a host of options to refine the search based on power ratings, input, output, etc.
Did have to end up using a regulator to step down the input voltage. It worked for the short trials I did while mocking it up, and then to verify the final product. But after 5 minutes on the road it turned off. There's a 'watchdog' feature on the chip to prevent damage from operating outside the parametes, so it just kept tripping the circuit. I picked up a cheapo 12vdc regulator from Radioshack for about $1.50 and wired that into the circuit, works great now, even for extended periods. --Ryan
Did have to end up using a regulator to step down the input voltage. It worked for the short trials I did while mocking it up, and then to verify the final product. But after 5 minutes on the road it turned off. There's a 'watchdog' feature on the chip to prevent damage from operating outside the parametes, so it just kept tripping the circuit. I picked up a cheapo 12vdc regulator from Radioshack for about $1.50 and wired that into the circuit, works great now, even for extended periods. --Ryan