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SP6651AEU-L/TR

High Efficiency 800mA Synchronous Buck Regulator

Signal Processing Technologies 

®

SP6651A

High Efficiency 800mA Synchronous Buck Regulator

Ideal for portable designs powered with Li Ion battery

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

PVIN 1

VIN 2

BLON 3

D1 4

D0 5

10 LX

SP6651A

10 Pin DFN

9 PGND

8 GND

7 VOUT

6 FB

Now Available in Lead Free Packaging

APPLICATIONS

■ PDA's

■ DSC's

■ MP3 Players

■ USB Devices

■ Point of Use Power

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.

TYPICAL APPLICATION SCHEMATIC

2.7V to 5.5V Input

VI

CIN

22µF

1M

BLON

10Ω

RVIN

CVIN

1µF

D1

D0

SP6651A

PVIN

LX

VIN

PGND

BLON

GND

D1

VOUT

D0

FB

L1

10µH

COUT

22µF

VOUT

800mA

VO

CF

RF

22pF

RI

200K

Date: 5/25/04

SP6651A High Efficiency 800mA Synchronous Buck Regulator

1

© Copyright 2004 Sipex Corporation

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