Can this be done?
I need to run a Raspberry Pi off a 12 VDC battery. I have two (2) Voltage Regulators (VR) each regulator uses an AMS1117-5 regulator capable of 5 VDC @ 1 Amp. The full current draw of the Raspberry Pi (RPi) is 0.65 Amps (650 mA). I would like to parallel both VR – Both the Input and Output. I cannot use OR Diodes as the voltage drop across the diode would be too much. The RPi is very voltage sensitive. What I hope to gain is a very long battery life for the RPi since the battery is 12 VDC @ 6 AH and a low current draw through each VR. Note: The current draw does not have to be balanced since the total current draw is less than the rating of an individual VR. So Can it be done? Safely & somewhat efficiently? THANK YOU! Barry

  • \$\begingroup\$ Won't help - the current from the battery will be the same either way. So as one 1Amp regulator will do the job, there's nothing to gain from using a second one. \$\endgroup\$ – Brian Drummond Jan 19 '17 at 22:06
  • \$\begingroup\$ Thanks Brian: I'm guessing that one VR will conduct a little more or less than the other. If I split the current even with a 60/40 split I'm hoping for less heat and less of a load on each VR. Does that sound logical? I don't want to blow a VR either. Thanks again Brian. Barry \$\endgroup\$ – Barry Jan 19 '17 at 22:17

Using linear regulators will waste about 4.5 watts, and will require a good heatsink on the regulator(s).

It would be much more efficient (and cooler) to use a switching regulator (DC-DC converter)


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