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 down to 1.0V, logic level shutdown control, and 140°C over temperature shutdown.

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

APPLICATIONS

■ PDAs

■ DSCs

■ MP3 Players

■ USB Devices

■ Point of Use Power