NCP1521B

Buck Converter - DC-DC 1.5 MHz, 600 mA NCP1521B The NCP1521B step−down DC−DC converter is a monolithic integrated circuit optimized for portable applications powered from one cell Li−Ion or three cell Alkaline/NiCd/NiMH batteries. The part, available in adjustable output voltage versions ranging from 0.9 V to 3.9 V, is able to deliver up to 600 mA. It uses synchronous rectification to increase efficiency and reduce external part count. The device also has a built−in 1.5 MHz (nominal) oscillator which reduces component size by allowing smaller inductors and capacitors. Automatic switching PWM/PFM mode offers improved system efficiency. Additional features include integrated soft−start, cycle−by−cycle current limiting and thermal shutdown protection. The NCP1521B is available in a space saving, low profile TSOP5 package. Features Up to 96% Efficiency Best−In−Class Ripple, including PFM Mode Sources up to 600 mA 1.5 MHz Switching Frequency Adjustable Output Voltage from 0.9 V to 3.9 V Synchronous Rectification for Higher Efficiency 2.7 V to 5.5 V Input Voltage Range Low Quiescent Current Shutdown Current Consumption of 0.3 mA Thermal Limit Protection Short Circuit Protection All Pins are Fully ESD Protected This is a Pb−Free Device Typical Applications Cellular Phones, Smart Phones and PDAs Digital Still/Video Cameras MP3 Players and Portable Audio Systems Wireless and DSL Modems Portable Equipment USB Powered Devices VIN CIN OFF ON 1 VI...