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Date: 2/1/05

SP6654 High Efficiency 800mA Synchronous Buck Regulator

© Copyright 2005 Sipex Corporation

SP6654

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

High Efficiency 800mA Synchronous Buck Regulator

APPLICATIONS

■ PDA's

■ DSC's

■ MP3 Players

■ USB Devices

■ Point of Use Power

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 0.3Ω power 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 pro-

grammed output voltage down to 1.0V, logic level shutdown control, and an open drain power

®

PWR

GD

VI

VO

D1

D0

22µF

L1

10µH

800mA

2.7V to 5.5V Input

10Ω

1µF

SP6654

PWR

GD

D1

D0

LX

GND

FB

22µF

CF

22pF

200K

1M

Ideal for portable designs powered with Li Ion battery

TYPICAL APPLICATION SCHEMATIC

DESCRIPTION

SP6654

10 Pin DFN

10

9

8

7

6

1

2

3

4

5

D1

D0

LX

GND

FB

Now Available in Lead Free Packaging