I have lm2576 switching regulator circuit with output constant 5v/3A. Can I use it with a 12V battery and connect it to power my Arduino?
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See Choosing power supply, how to get the voltage and current ratings? to clear up your apparent confusion about how power supplies are specified. Aside from that you'll also need to know the current capability of your 12 V battery to know whether it can supply enough power for your load. – The Photon Apr 11 '16 at 00:41
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@ThePhoton my supply capable current lest than 1.8A... from the links you provide i understand that current depends on the load, right? So, i thinks its ok with this.. im only scaring with the word "constant" before – rezhart Apr 11 '16 at 00:52
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2As long as the total load doesn't need more than about 18 W (assuming the converter is 85% efficient). – The Photon Apr 11 '16 at 00:53
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If you are using something like the Arduino Uno that has a power jack, you can just directly connect the 12V to the power jack as the Arduino has an internal voltage regulator (although not a buck converter I believe).
Or you could use the buck converter IC (Lm2576) you mentioned and follow figure 1 exactly from the datasheet and place the output through USB or the 5V pin instead.
Bence Kaulics
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