CandyQ 5pack MP1584EN ultra Small DC-DC 3A power Step-Down Adjustable Module Buck Converter 24V To 12v 9V 5V 3V for Arduino Input Voltage: 4.5V to 28V Output Voltage:0.8V to 20V Output Current: 1.8 A typical (3.0 Max) Output Ripple Frequency: 340 KHz Ripple Voltage: 30mV