SP6651A

® SP6651A Ideal for portable designs powered with Li Ion battery High Efficiency 800mA Synchronous Buck Regulator FEATURES ■ DFN Package (3mm x 3mm) ■ Ultra-low 20µA Quiescent Current ■ 98% Efficiency Possible ■ 800mA Output Current ■ 2.7V to 5.5V Input Voltage Range ■ Output Adjustable Down to 1.0V ■ No External FET’s Required ■ 1.25A Inductor Peak Current Limit ■ 100% Duty Ratio Low Dropout Operation ■ 80µA Light Load Quiescent Current in Dropout ■ Over Temperature Protection ■ Logic Shutdown Control ■ Programmable UVLO and Adaptive Battery Low Output PV IN V IN BLON D1 D0 1 2 3 4 5 10 LX SP6651A 10 Pin DFN 9 PGND 8 GND 7 VOUT 6 FB Now Available in Lead Free Packaging APPLICATIONS ■ PDA's ■ DSC's ■ MP3 Players ■ USB Devices ■ Point of Use Power DESCRIPTION The SP6651A is a 800mA synchronous buck regulator which is ideal for portable applications that use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6651A’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 SP6651A seamlessly transitions into 100% duty ratio operation further extending useful battery life. The SP6651A 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 do...