When I last looked, Tripath weren't trying very hard to get into automotive - they appeared more interested in the home cinema market (the early sony 5.1 DVD player and amp-in-a-box used tripath chips). That may well have changed now though.

I dug around their site yesterday, and their only obviously automotive product has a non-inspiring power output (intended for OEM headunit integration, I guess).
_________________________
Mk2a 60GB Blue. Serial 030102962 sig.mp3: File Format not Valid.