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 0.3?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.

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

APPLICATIONS

■ Cell Phones

■ PDAs

■ DSCs

■ MP3 Players

■ USB Devices

■ Point of Use Power