XL2596S-12E1 is a DC-DC converters step-down adjustable (fixed) 1 4.5V 40V 1.23V 37V 3A TO-263-5 RoHS manufactured by XLSEMI. It is a high efficiency, step-down (buck) DC/DC converter with an adjustable output voltage (1.23V to 37V). The device is designed for easy implementation into many applications such as backup battery, power supply, on-board and DC distribution systems, and wide input voltage operating range from 4.5V to 40V. It has built-in soft-start (PWM) and current limit, and provides very low output ripple and minimal external components. The device is also RoHS compliant and meets the stringent requirements for used in automotive, industrial, telecommunications, and other applications.