MP1584EN 5pcs Mini 5V Buck Converter Board - 5-30V to 5V, 1.8A Output, Small Size, Black

Pleasantly surprised by these little boards. I tested a couple before attaching one to a real device, and it was a rock solid 5.00v output. Very happy with these

I’ve used these before, and they work great. There’s one thing about these, that you may be curious about, if you haven’t used one before, the ground is common on the -input and -output sides. What that means is if you power it with a +12v input, you can use both the +12 and +5 on same circuit, if needed and the ground line will be common to both voltages. You have to remember though that the MP1584EN has a Max rating of only 3Amp. Even if you use a 12v 5Amp power supply to power it, you won’t be able to get the full 5Amp out on 5v line. You may even need to add on a small heatsink on top of the MP1584EN to handle the 1.8Amp that description shows. I use one of the small stick on heatsinks, that are used on stepper motor driver ICs. Stick the heatsink on top of the square chip, not on the bigger square inductor. All five of the ones I received, were right on 5.1V output. That’s within tolerance for 5V circuits. Very good buy, here.

I make a lot of microcontroller devices that need a 5V power supply. I like to use a 9V plug and this steps down the power to a solid 5V. After being powered on for several hours, it is still cool and doesn't require any kind of heat sink or fan. I've enjoyed using them instead of other options I have used in the past. I really like the small size and simple use.

Quite happy with these. They seem to have a thermal protection feature as well. I overloaded one a bit and it got to north of 60° C before shutting itself off and recovering. Saved me from resoldering a new one!

says it can take up to 28v, but blew up on my 14v power supply, and took my meshtastic node out with it. do not recommend.

Nothing was wrong with them. These are seemingly an ideal alternative to larger converters. But, in my application they would burn out if used continuously for more than 2 hours (supplying power for a Garmin Zumo XT). Power draw was within stated specs, but I imagine they'd fair better within an environment with less demand. Disappointing, but not too surprising. If Garmin could reliably provide reliable power in a smaller footprint, I'm sure they would. The fact they don't is a good indication they weren't fit for the purpose despite the specs.

These worked well for stepping down my 12V boat battery to 5V to power my ESP32 electronics project. After wiring them up I used heat-shrink to insulate them from other electronics inside the enclosure I am using. Very low current draw when the ESP32 is in deep sleep mode (<0.25mA for the buck converter and the ESP32 board). 1 of the 5 boards stopped working after a few minutes of use. I don't think that was my error. The other 4 boards have worked fine now for many hours.

Work perfectly, run relatively cool