Using vehicle 12v to power several 5v devices

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SUMMARY

To power three 5V devices from a vehicle's 12V auxiliary power, a voltage regulator rated for 3-5A and capable of handling input voltages up to 17V is required. Each device draws a total of 2.75A, which is within the capacity of the vehicle's power system. A suitable voltage regulator can be found at Digi-Key, such as part number 576-1121-ND. Additionally, a heatsink is necessary to manage heat dissipation effectively.

PREREQUISITES
  • Understanding of voltage regulation and current requirements
  • Familiarity with vehicle electrical systems
  • Knowledge of heat dissipation techniques
  • Experience with electronic components and sourcing
NEXT STEPS
  • Research voltage regulator specifications and selection criteria
  • Learn about heat sink design and thermal management
  • Explore vehicle electrical system safety and fuse selection
  • Investigate alternative methods for powering 5V devices from 12V sources
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Electronics hobbyists, automotive engineers, and anyone looking to integrate 5V devices into vehicle power systems.

JimmyRolland
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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
 
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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!
 

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