I'm trying to get my retro consoles and PS1 screen to run off the cigarette lighter in my car. I have a PTH08080 which will step down 12 volts to 5 with an efficiency of 93.5% which is perfect for my SNES and Mega Drive (the two best consoles of all time ). The problem is the PS1 screen needs somewhere between 8.5 and 6.9 volts to run. I don't want to use a 7808 regulator because they are very inefficient and I don't want to be stuck with a dead car battery in the morning. I've done a bit of searching and found a recomendation for an MC34063 chip. I figure its best to ask for advice before I start buying and soldering stuff together.