SP6655ER-L/TR 데이터 시트보기 (PDF) - Signal Processing Technologies

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SP6655ER-L/TR

High Efficiency 400mA Synchronous Buck Regulator

Signal Processing Technologies 

®

SP6655

High Efficiency 400mA Synchronous Buck Regulator

Ideal for portable designs powered with Li Ion battery

FEATURES

■ 98% Efficiency Possible

■ Small 10-Pin DFN Package

■ Ultra-low 20µA Quiescent Current

■ 625mA Inductor Peak Current Limit

■ Guaranteed Minimum 400mA Output

Current

■ 2.7V to 5.5V Input Voltage Range

■ Output Adjustable Down to 1.0V

■ 100% Duty Ratio Low Dropout

Operation

■ 80µA Light Load Quiescent Current in

Dropout

PVIN 1

VIN 2

BLON 3

D1 4

D0 5

10 LX

SP6655 9 PGND

10 Pin DFN

8 GND

7 VOUT

6 FB

Now Available in Lead Free Packaging

APPLICATIONS

■ Cell Phones

■ PDA's

■ DSC's

■ MP3 Players

■ USB Devices

■ Point of Use Power

DESCRIPTION

The SP6655 is a 400mA synchronous buck regulator which is ideal for portable applications that

use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6655’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 SP6655

seamlessly transitions into 100% duty ratio operation, further extending useful battery life. The

SP6655 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

10µF

1M

BLON

10Ω

RVIN

CVIN

1µF

D1

D0

SP6655

PVIN

LX

VIN

PGND

BLON

GND

D1

VOUT

D0

FB

L1

10µH

COUT

10µF

VOUT

400mA

VO

CF

RF

22pF

RI

200K

Date: 09/27/05

SP6655 High Efficiency 400mA Synchronous Buck Regulator

1

© Copyright 2004 Sipex Corporation

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