MP1584 Datasheet here High EfficiencyStep down regulator BUCK Power Module. High Efficiency (upto 96%) as switching frequency is approx 1MHZ.
Power Supply module - 5V Output - 4.5V-12V Input DC - UK Free P&P
Power Supply for Breadboard - 3.3V-5V Output - DC In - USB Out - UK Free P&P
Power Supply for Breadboard - 3.3V-5V Output - DC In - Mini USB - UK Free P&P
Voltage Regulator Board 5V Output High Efficiency Overvoltage Protection
5-30V to 3.3V 5V 9V 12V Fixed Mini Buck Converter Step Down Module Power Supply
