View lm2596 datasheet:

LM2596 3.0 A, Step-Down Switching Regulator The LM2596 regulator is monolithic integrated circuit ideally suited for easy and convenient design of a step-down switching regulator (buck converter). It is capable of driving a 3.0 A load with excellent http://onsemi.com line and load regulation. This device is available in adjustable output version and it is internally compensated to minimize the number of external components to simplify the power supply design. Since LM2596 converter is a switch-mode power supply, its TO-220 efficiency is significantly higher in comparison with popular 1 TV SUFFIX three-terminal linear regulators, especially with higher input voltages. CASE 314B 5 The LM2596 operates at a switching frequency of 150 kHz thus allowing smaller sized filter