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