This is small buck (step down, output voltage lower than input) DC-DC converter based on the MP1584EN switch mode buck converter IC, you can provide input voltage between 7v and 28v and get output voltage of 5.25v, this performance has been verified by my tests.
Why 5.25v? Probably to account for voltage drop over wires at higher currents. 5.25v is within the tolerance for the 5v USB specification.
I have performed a range of characterisation tests on these devices please download this PDF for the full test results of the MP1584EN module so you can properly evaluate suitability for your task.
I foudn that it is imperative that you add around a 100uF electrolytic capacitor on the output of these devices for best results.
The actual test-derived specifications are:
Other sellers of this module make claims that are not correct or at best are very much stretching the bounds of reason, see my PDF for the real data!
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