ITEM NAME:DC-DC Converter 3V-24V to 5v 9v 12v 24v Step up boost Module supply Power L9F4 LM2596 DC-DC step-down module power Buck Supply Converter Specification: 100% BRAND NEW DC-DC step-down power module Name / number LM2596S DC-DC step-down module Input voltage 3.2V 40V Output voltage 1.25V 35V Output current 3A (max) Conversion efficiency of 92% (maximum) Output ripple 30mV Switching frequency 65KHz Operating temperature -45 ℃ +85 ℃ Size 43mm * 21mm * 14mm (L * W * H) IN-IN + input Positive Input Negative! Positive output OUT + OUT-output negative Input voltage range: DC 3.2V to 40V (input voltage must be greater than the output voltage to 1.5V or more high. Could not boost) Output Voltage Range: 1.25V to 35V DC voltage continuously adjustable, high efficiency (up to 92%) the maximum output current of 3A, Measured 12V input, 5V output current is 1A load regulation rate of less than 1% Note: This is the step-down module, the input voltage must be higher than the output voltage.Output current is greater than 2.5A (or output power greater than 10W) to work long hours, please add heat sink.(Could not boost). DC-DC step-down power module. IN-IN + input Positive Input Negative! Output current 3A (max).