Size: 22mm x 17mm x 4mm/0.87 x 0.67 x 0.16 (L x W x H)Module Properties: Non-isolated step-down module (buck)Great for little LED or Arduino projects, DIY mobile power supply, monitor power supply.

• Mini MP1584EN 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: 22 mm by 17 mm by 4 mm; Warning: do not reverse the positive and negative terminals to avoid any possible damage; Do not use light load (less than 10% of output power) or without load
• 

• Mini 1584 step down Buck

• Model:MP1584
• Name:DC-DC step-down module
• Input Voltage: 4.5V ~ 28V
• Output voltage: 0.8V ~ 20V
• Output Current: 3A (Max)
• Conversion efficiency: 96% (maximum)
• Output Ripple: <30mV
• Switching frequency: 1.5MHz (highest) typically 1MHz
• Operating Temperature: -45°C ~ +85°C
• Size: 22mm * 17mm (L * W )
• en.wikipedia.org