LTC3521 datasheet(20/20 Pages) LINER

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LTC3521

3521f

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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



LINEAR TECHNOLOGY CORPORATION 2010

LT 0310 • PRINTED IN USA

relaTeD parTs

PART NUMBER

DESCRIPTION

COMMENTS

LTC3100

700mA ISW, 1.5MHz, Synchronous Step-Up, 250mA

Synchronous Step-Down DC/DC Converter and 100mA LDO

94% Efficiency, VIN: 0.7V to 5V, VOUT(MAX) = 5.25V, IQ = 15µA,

ISD < 1µA, 3mm × 3mm QFN-16 Package

LTC3101

Wide VIN, Multioutput DC/DC Converter and PowerPath™

Controller, 800mA Buck-Boost, Dual 350mA Buck

Converters, 50mA Always-On LDO

95% Efficiency, VIN: 1.8V to 5.5V, IQ = 38µA, Standby IQ = 15µA,

4mm

× 4mm QFN-24 Package

LTC3409

600mA IOUT, 1.7MHz/2.6MHz, Synchronous Step-Down

DC/DC Converter

96% Efficiency, VIN: 1.6V to 5.5V, VOUT(MIN) = 0.6V, IQ = 65µA,

ISD < 1µA, DFN Package

LTC3441/LTC3442/

LTC3443

1.2A IOUT, 2MHz, Synchronous Buck-Boost DC/DC

Converter

95% Efficiency, VIN: 2.4V to 5.5V, VOUT(MIN): 2.4V to 5.25V,

IQ = 50µA, ISD < 1µA, DFN Package

LTC3520

1A 2MHz, Synchronous Buck-Boost and 600mA Buck

Converter

95% Efficiency, VIN: 2.2V to 5.5V, VOUT(MAX) = 5.25V, IQ = 55µA,

ISD < 1µA, 4mm × 4mm QFN-24 Package

LTC3522

400mA 2MHz, Synchronous Buck-Boost and 200mA Buck

Converter

95% Efficiency, VIN: 2.4V to 5.5V, VOUT(MAX) = 5.25V, IQ = 25µA,

ISD < 1µA, 3mm × 3mm QFN-16 Package

LTC3531/LTC3531-3/

LTC3531-3.3

200mA IOUT, 1.5MHz, Synchronous Buck-Boost DC/DC

Converter

95% Efficiency, VIN: 1.8V to 5.5V, VOUT(MIN): 2V to 5V, IQ = 16µA,

ISD < 1µA, ThinSOT and DFN Packages

LTC3532

500mA IOUT, 2MHz, Synchronous Buck-Boost DC/DC

Converter

95% Efficiency, VIN: 2.4V to 5.5V, VOUT(MIN): 2.4V to 5.25V,

IQ = 35µA, ISD < 1µA, MS10 and DFN Packages

LTC3547

Dual 300mA 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, DFN-8 Package

Typical applicaTion

Li-Ion to 3.3V at 800mA, 1.8V at 600mA and 1.2V at

600mA with Sequenced Start-Up

Sequenced Start-Up Waveforms

PVIN1

PVIN2

SW2

VOUT1

FB2

FB1

SW3

LTC3521

SHDN1

100k

137k

68.1k

10µF

4.7µF

Li-Ion

4.7µH

VOUT2

1.8V

600mA

1.0M

221k

22µF

VOUT1

3.3V

800mA

(1A, VIN > 3.0V)

VIN

2.4V TO

4.2V

100k

499k

3521 TA03a

PGOOD1

PGOOD3

PWM

SW1A

SW1B

FB3

PGOOD2

SHDN2

SHDN3

PGOOD1

PGND2

GND

PGND1

PWM

BURST

OFF

VOUT3

1.2V

600mA

500µs/DIV

VOUT2

2V/DIV

VOUT3

2V/DIV

VOUT1

2V/DIV

SHDN2, 5V/DIV

PGOOD2, 5V/DIV

PGOOD3, 5V/DIV

3521 TA03b

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