SunFounder DC-DC Step Down Voltage Converter LM2596 3V-12V to 5V/3A Buck Low Regulator Transformer Voltage Converter Module Board INPUT - DC 3.3V to 12V, no boost. OUTPUT - DC 3 V to 5 V, maximum output current is 3 A. RICH PINS- Output enabled by pins so more modules can be powered. PIN EXTENSION - provided with a soldering pad for a terminal block of power output DIMENSIONS - 25 x 50 x 16 mm (0.98 x 1.97 x 0.63 inch)