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Hello everyone I am running into some kind of problem. I want to power my Pi 4B+ through the GPIO pins via a buck converter but it just wont work. I used the LM2596 non adj 5V buck. In its typical application form. dsf

And I also bought the LM2596 adj and set it with the potmeter that comes with it. It has a small voltage riple but stays within the 5% of 5V tolerance. And the third thing I tried was to supply it with my bench power supply. I tried al 3 cases with GPIO powering and via a stripped usb c cable but none of them work.

All tries end up with the red led staying on for a couple of seconds while the green led flashes but after that the red led dies.

My bench power supply can supply 4A at 5V and I even tried 5.1V as I read that the RPI adapter supplies that. Picture beneath shows PI 4B+ schematic.

enter image description here

I also tried a 3S High discharge battery but that didnt solve it. Picture beneath shows setup. enter image description here

I also measured the voltage while its been connected to the Pi. As you can see Vavg is 5.05V, Vmax 5.22V and Vmin 4.85V enter image description here

Luuk Benningshof
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2 Answers2

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I bought a 12v - 5v converter for a few bucks on Amazon, and used the connector from an 18650 LiPO battery on the 5v and Ground pins on my Pi 4b. I've got a 12v 5a power supply from a dumpster running power to the converter, and it works like a charm!

user163293
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What fixed it for me was: I set the LM2596 adj to a higher outputvoltage of 5.1V. The power supply that the Pi came with is also set to 5.1V

Luuk Benningshof
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