DESCRIPTION

The SP6654 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 SP6654’s proprietary control loop, 20µA light load quiescent current, and 0.3Ωpower switches provide excellent efficiency across a wide range of output currents. As the input battery supply decreases towards the output voltage the SP6654 seamlessly transitions into 100 duty ratio operation further extending useful battery life. The SP6654 is protected against overload and short circuit conditions with a precise inductor peak current limit. Other features include programmable under voltage lockout, externally programmed output voltage down to 1.0V, logic level shutdown control, and an open drain power good indicator when VOUT is above 94 of its programmed value.

FEATURES

■ 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

■ Logic Shutdown Control

■ Programmable UVLO

■ Small 10 pin MSOP Package

■ Power Good Indicator

■ Industry Standard 10 Pin MSOP and and Small DFN Package

APPLICATIONS

■ PDAs

■ DSCs

■ MP3 Players

■ USB Devices

■ Point of Use Power