The LM2596S Dual USB DC-DC 9V, 12V, 24V, 36V To 5V 3A Step Down Buck Converter Board is based on monolithic integrated circuit LM2596 ideally suited for easy and convenient design of a step−down switching regulator (buck converter). It is capable of driving a 3.0A load with excellent line and load regulation. This converter board accepts an input voltage range of 9V to 36V DC to step the voltage down to 5V at 3A for each USB Port. 

Input: 6V-36V (DC5.5/2.1 port, connecting terminal)

Output: 5V / 3A (MAX)(With Identification resistance for Apple)
Efficiency: 92% (MAX)
Switching frequency: 150KHZ
Working temperature: -40 - + 85
Load capacity: Maximum output 3A (Connect with two phones simultaneously)
Scope: mobile power, mobile phones, flat-panel powered devices USB5V