I'm working on a vehicle related project where my Arduino Uno R3 will be opening/closing a couple of mosfets on a daughter board that a friend and I put together. It's not a lot of heavy lifting. We tested it while running on power from the USB port and so far, so good. Now that we're ready to install it in the car and power it from the 2.1mm power plug, I am shopping for a DC/DC step down converter that can deliver the necessary 9V and won't allow the car to burn the Arduino during normal operation.
I was looking at these two models and was hoping that the forum could help me decide or tell me if I'm missing the mark entirely:
Would either of these do the trick? Is one better than the other?
*My background is in CS/CE so I'm learning this as I go. **I searched before posting this question and I couldn't find anything that pointed to a specific product and that had a general consensus.