LM2596HV Adjustable Step Down DC To...
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Input voltage range: DC 4.5V to 53V (input voltage must be greater than the output voltage to 1.5V or more high.Could not boost)
Output voltage range: DC 3V to 40V voltage is continuously adjustable, high efficiency (up to 92%) the maximum output current of 3A.
to work long hours, please add heat sink.