Using vehicle 12v to power several 5v devices

[JimmyRolland]

I need to power three 5 volt devices off a vehicle 12 volt axillary power. Each device draws 1.5A, 500 mA, and 750 mA. Would the vehicle 12 volt axillary power provide enough current for this? If so, what parts and configuration would I need to accomplish this?

Thanks

 

[KingNothing]

Yes - you can draw many amps of power, so long as you use a fuse in the right range.

The part you are looking for is a voltage regulator. Make sure it's rated for something like 3-5A, and input of up to 17V (voltage is fairly unreliable from a car's electrical system).

Something like this might work: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=576-1121-ND. You will need a heatsink to dissipate the heat!