DC-DC an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of electric power converter. It is used in portable electronic devices such as cellular phones and laptop computers, which are supplied with power from batteries primarily. Such electronic devices often contain several sub-circuits, each with its own voltage level requirement different from that supplied by the battery or an external supply. Key applications 鈼?One, Two and Three Cell Alkaline and NiMH/NiCd Portable Products 鈼?Solar Cell Applications 鈼?Personal Care and Medical Products 鈼?Bias for Status LEDs 鈼?Smartphones, MP3 Players, Digital Cameras 鈼?Remote controllers, Portable Instruments 鈼?Wireless Sensors 鈼?Bluetooth HeadsetsChina IC-Semiconductor-Integrated Circuits website:http://www.jscj-semi.com/active-component/ic-semiconductor-integrated-circuits/