At 06:12 PM 9/6/2011, Marius Strom wrote... >If you go down this path, make sure it's either switchable or that you >install a switch. 12V->5V convertors destroy a lot of power while >sitting there idle. Not anything reasonable. If using a cheap linear regulator like a 7805, it will draw <10 mA quiescent current. They get inefficient only when actually providing power, because they have to dissipate the difference. I powered a couple of USB outlets with a LDO03C switcher, so I could draw a full 1.5 A from each, and it runs <50 mA quiescent, only a bit more than might be expected from a powered off car stereo. |
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