SP6656

SP6656 High Efficiency 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output FEATURES ■ 98% Efficiency Possible ■ Offered in small 2.4 x 2.5mm DFN ■ 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 ■ Dynamic Adjustable Output Voltage ■ Ideal for portable designs powered with Li Ion battery PVIN 1 VIN 2 OVSO 3 OVSI 4 EN 5 SP6656 10 Pin DFN 10 LX 9 PGND 8 GND 7 VOUT 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 SP6656 is a 400mA synchronous buck regulator that is ideal for portable applications that use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6656’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 SP6656 seamlessly transitions into 100% duty ratio operation further extending useful battery life. The SP6656 is protected against overload and short circuit conditions with a precise inductor peak current limit. Other features include externally programmable output voltage down to 1.0V, dynamically adjustable output voltage, logic level shutdown control, and...