About this item Mini DC to DC buck converter module with a wide operating range Input voltage: 4.5 V to 28 V; Output voltage: 0.8 V to 20 V Output current: 3 A (maximum); Conversion efficiency: 92% (maximum) Output ripple: less than 30 mV; Switching frequency: 1.5 MHz (highest), typically 1 MHz Operating temperature: -45 to 85 ; Size: 0.16 x 0.87 x 0.16 inches Dimensions: 0.16 x 0.87 x 0.16 inches.