Quote:
Originally Posted by steinra
It is more for the 12v than the 5v, but to allow for the voltage drops in the battery supply side under heavy drive load (see supply drops to 9v/10v during heavy acceleration / motor use). Mainly to avoid brown out conditions for devices that need that stable higher voltage.
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If you just need a regulated 12v supply, you can buy a single buck/boost supply that outputs 12v and has a wide input range. Then there's no need chain a bunch of regulators together. I don't know what your current requirements are, that will be driving your purchase.
This one on amazon says it can output 2A @ 12V with no heatsink. Could wire directly into the PDB connections off a breaker.
These things all come out of china, so if you can deal with waiting a few weeks for shipping, you can check ebay for better prices and a wider array of parts/suppliers to choose from.