The LT1374CR#PBF is a linear DC switching regulator from Linear Technology. It is a 4.5A adjustable SEPIC (Single Ended Primary Inductance Converter) buck regulator in a D2PAK package. This device is designed to provide a regulated output voltage from an unregulated input voltage. It features a wide input voltage range of 4.5V to 40V and an adjustable output voltage range of 0.8V to 36V. The LT1374CR#PBF also features a low quiescent current of only 1.5mA, making it ideal for battery-powered applications. It also has a high efficiency of up to 95%, making it suitable for high power applications. The LT1374CR#PBF is a versatile and reliable DC switching regulator that is suitable for a wide range of applications.