LTC3444 データシートの表示（PDF） - Linear Technology

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LTC3444

Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

Linear Technology 

LTC3444

TYPICAL APPLICATIO

Externally Compensated WCDMA Application. Singe Cell,

3.1V to 4.2V Input, 0.8V to 4.2V at 400mA Output.

3.3μH

L1

3.1V TO 4.2V

CIN

+ 4.7μF

Li-Ion

LTC3444

SW1

SW2

VIN

SHDN

VOUT

FB

GND

VC

R4

47.5k

C1

10pF

R5

C2

47.5k 220pF

C3

10pF

R1

340k

VOUT

0.8V TO 4.2V

COUT

4.7μF

R3

R2

205k

267k

VCONTROL

DAC

3444 TA03

CIN = MURATA:GRM31CR61C475K

COUT = MURATA:GRM31CR61C475K

L1 = COOPER BUSSMAN SD12-3R3

RELATED PARTS

PART NUMBER

LTC3403

LTC3408

LTC3440

LTC3441

LTC3442

LTC3443

DESCRIPTION

1.5MHz, 600mA, Synchronous Step-Down Regulator

with Bypass Transistor

1.5MHz, 600mA, Synchronous Step-Down Regulator

with Bypass Transistor

Up to 2MHz, 600μA, Synchronous Buck-Boost

DC/DC Converter

1MHz, 1.2A, Synchronous Buck-Boost

DC/DC Converter

Up to 2MHz, 1.2A, Synchronous Buck-Boost

DC/DC Converter

600MHz, 1.2A Synchronous Buck-Boost

DC/DC Converter

20 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

COMMENTS

96% Efficiency, VIN: 2.5V to 5V, VOUT: 0.3V to 3.5V,

ISD <1μA, (3mm × 3mm) DFN Package

96% Efficiency, VIN: 2.5V to 5V, VOUT: 0.3V to 3.5V,

ISD <1μA, (3mm × 3mm) DFN Package

95% Efficiency, VIN: 2.5V to 5.5V, VOUT(MIN) = 2.5V,

ISD <1μA, IQ = 25μA, 10-Lead MS Package

95% Efficiency, VIN: 2.5V to 5.5V VOUT(MIN) = 2.5V,

ISD <1μA, IQ = 25μA, 12-Lead (4mm × 3mm) DFN Package

95% Efficiency, VIN: 2.5V to 5.5V, VOUT(MIN) = 2.5V,

ISD <1μA, IQ = 25μA, 12-Lead (4mm × 3mm) DFN Package

95% Efficiency, VIN: 2.5V to 5.5V, VOUT(MIN) = 2.5V,

ISD <1μA, IQ = 25μA, 12-Lead (4mm × 3mm) DFN Package

3444fb

LT 0507 REV B • PRINTED IN THE USA

© LINEAR TECHNOLOGY CORPORATION 2005

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