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LTC3549

3549f

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0706 • PRINTED IN USA

PART NUMBER

DESCRIPTION

COMMENTS

LTC1878

600mA (IOUT), 550kHz, Synchronous

Step-Down DC/DC Converter

96% Efﬁciency, VIN: 2.7V to 6V, VOUT(MIN) = 0.8V, IQ = 10µA, ISD < 1µA,

MS8 Package

LTC1879

1.20A (IOUT), 550kHz, Synchronous

Step-Down DC/DC Converter

95% Efﬁciency, VIN: 2.7V to 10V, VOUT(MIN) = 0.8V, IQ = 15µA, ISD < 1µA,

16-Lead TSSOP

LT3020

100mA, Low Voltage VLDO™

VIN: 0.9V to 10V, VOUT(MIN) = 0.20V, Dropout Voltage = 0.15V, IQ = 120µA,

ISD < 3µA, VOUT = ADJ, DFN/MS8 Packages

LTC3025

100mA, Low Voltage VLDO

VIN: 0.9V to 5.5V, VOUT(MIN) = 0.40V, Dropout Voltage = 0.05V, IQ = 54µA,

ISD < 1µA, VOUT = ADJ, DFN Package

LTC3404

600mA (IOUT), 1.4MHz, Synchronous

Step-Down DC/DC Converter

96% Efﬁciency, VIN: 2.7V to 6V, VOUT(MIN) = 0.8V, IQ = 10µA, ISD < 1µA,

MS8 Package

LTC3405/LTC3405A

300mA (IOUT), 1.5MHz, Synchronous

Step-Down DC/DC Converter

95% Efﬁciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 20µA, ISD < 1µA,

ThinSOT ™ Package

LTC3406/LTC3406B

600mA (IOUT), 1.5MHz, Synchronous

Step-Down DC/DC Converter

96% Efﬁciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.6V, IQ = 20µA, ISD < 1µA,

ThinSOT Package

LTC3407/LTC3407-2

Dual, 800mA (IOUT), 2.25MHz, Synchronous

Step-Down DC/DC Converter

95% Efﬁciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.6V, IQ = 40µA, ISD < 1µA,

10-Lead MSE Package

LTC3409

600mA, 2.6MHz Low VIN, Synchronous

Step-Down DC/DC Converter

95% Efﬁciency, VIN: 1.6V to 5.5V, VOUT(MIN) = 0.6V, IQ = 65µA, ISD < 1µA,

DFN Package

LTC3410/LTC3410B

300mA, 2.25MHz, Synchronous Step-Down

DC/DC Converter

96% Efﬁciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 26µA/200µA, ISD < 1µA,

SC70 Package

LTC3411

1.25A (IOUT), 4MHz, Synchronous

Step-Down DC/DC Converter

95% Efﬁciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 60µA, ISD < 1µA,

10-Lead MS Package

VLDO and ThinSOT are trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

RELATED PARTS

Efﬁciency vs Load Current

RUN

CIN

4.7

µF

CERAMIC

VIN

2.5V TO

4.2V

LTC3549

VIN

MODE

L1, 4.7

µH*

CL, 22pF

R1, 267k

137k

3549 TA03a

VFB

GND

COUT

4.7

µF

CERAMIC

VOUT

1.8V

*TDK VLF3012AT-4R7MR74

LOAD CURRENT (mA)

100

0.1

100

1000

3549 TA03b

VIN = 2.5V

VOUT = 1.8V

VIN = 4.2V

VIN = 3.6V

µs/DIV

VOUT

100mV/DIV

AC COUPLED

ILOAD

200mA/DIV

3549 TA03c

VIN = 3.6V

VOUT = 1.8V

ILOAD = 100mA to 250mA

Load Step Response

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