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Large more favorable! Model / Name LM2596S DC-DC step-down module Input voltage 3.2V to 40V Output voltage 1.25V to 35V Output current 3A (max) Conversion efficiency 92% (the highest) Output ripple <30mV Switching frequency 65KHz Operating Temperature -45 to +85 Size size 43mm * 21mm * 14mm (L * W * H) IN + input positive-IN-input negative! The OUT + output the positive OUT-output negative Input voltage range: DC 3.2V to 40V (input voltage must be higher than the output voltage above 1.5V. Could not boost) Output voltage range: DC voltage from 1.25V to 35V continuously adjustable, high efficiency (92%) of the maximum output current of 3A. The measured 12V input, 5V output current is 1A load regulation of less than 1% Note: This is a step-down module, the input voltage must higher than the output voltage.