DC-DC Buck Converter Step Down Module LM2596 Power Supply Output 1.23V-30VGreat little device, well built with very high efficiency. Very cost-effective DC to DC convertor.SpecificationInputvoltage: 4V-35VInput Current: 3A (maximum)Output voltage: 1.23V to 30VSwitching frequency: 150kHzLoad regulation: +- 5%Working temperature: -40C to +85CRectification mode: non-synchronous rectificationConversion efficiency: 92%Output ripple: 30mA (maximum)Voltage regulation: +- 2.5%Overall dimensions: 48mm x 23 mm x 14 mm