SP6655

® SP6655 Ideal for portable designs powered with Li Ion battery High Efficiency 400mA Synchronous Buck Regulator FEATURES ■ 98% Efficiency Possible ■ Small 10-Pin DFN Package ■ Ultra-low 20µA Quiescent Current ■ 625mA Inductor Peak Current Limit ■ Guaranteed Minimum 400mA Output Current ■ 2.7V to 5.5V Input Voltage Range ■ Output Adjustable Down to 1.0V ■ 100% Duty Ratio Low Dropout Operation ■ 80µA Light Load Quiescent Current in Dropout PVIN VIN BLON D1 D0 1 2 3 4 5 10 SP6655 10 Pin DFN LX 9 P GND 8 GND 7 V OUT 6 FB Now Available in Lead Free Packaging APPLICATIONS ■ Cell Phones ■ PDA's ■ DSC's ■ MP3 Players ■ USB Devices ■ Point of Use Power DESCRIPTION The SP6655 is a 400mA synchronous buck regulator which is ideal for portable applications that use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6655’s proprietary control loop, 20µA light load quiescent current, and 0.3Ω power switches provide excellent efficiency across a wide range of output currents. As the input battery supply decreases towards the output voltage the SP6655 seamlessly transitions into 100% duty ratio operation further extending useful battery life. The SP6655 is protected against overload and short circuit conditions with a precise inductor peak current limit. Other features include programmable under voltage lockout and low battery detection, externally programmed output voltage down to 1.0V, logic level shutdown control, and 140°C over temperature shutdown. TYPICAL APPLICATION SCHEMATI...