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LT3645

3645f

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

©LINEAR TECHNOLOGY CORPORATION 2011

LT 0511 • PRINTED IN USA

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER

DESCRIPTION

COMMENTS

LT3694

36V, 70V Transient Protection, 2.6A, 2.5MHz

High Efﬁciency Step-Down DC/DC Converter

with Dual LDO Controllers

VIN: 3.6V to 36V, Transient to 70V, VOUT(MIN) = 0.75V, IQ = 1mA, ISD < 1μA,

4mm × 5mm QFN-28, TSSOP-20E

LT3509

36V, 60V Transient Protection, Dual 700mA,

2.2MHz High Efﬁciency Step-Down DC/DC

Converter

VIN: 3.6V to 36V, Transient to 60V, VOUT(MIN) = 0.8V, IQ = 1.9mA, ISD < 1μA,

3mm × 4mm DFN-14, MSOP-16E

LT3689

36V, 60V Transient Protection, 800mA, 2.2MHz

High Efﬁciency MicroPower Step-Down DC/DC

Converter with POR Reset and Watchdog Timer

VIN: 3.6V to 36V, Transient to 60V, VOUT(MIN) = 0.8V, IQ = 75μA, ISD < 1μA,

3mm × 3mm QFN-16

LT3682

36V, 60VMax, 1A, 2.2MHz High Efﬁciency

Micropower Step-Down DC/DC Converter

VIN: 3.6V to 36V, Transient to 60V, VOUT(MIN) = 0.8V, IQ = 75μA, ISD < 1μA,

3mm × 3mm QFN-12

LT3970

40V, 350mA (IOUT), 2.2MHz, High Efﬁciency

Step-Down DC/DC Converter with Only 2.5μA of

Quiescent Current

VIN: 4.2V to 40V, VOUT(MIN) = 1.21V, IQ = 2.5μA, ISD < 1μA, 3mm × 3mm DFN-10,

MSOP-10

LT3990

62V, 350mA (IOUT), 2.2MHz, High Efﬁciency

Step-Down DC/DC Converter with Only 2.5μA of

Quiescent Current

VIN: 4.2V to 40V, VOUT(MIN) = 1.21V, IQ = 2.5μA, ISD < 1μA, 3mm × 3mm DFN-10,

MSOP-10

LT3791

38V, 1.2A, 2.2MHz High Efﬁciency MicroPower

Step-Down DC/DC Converter with IQ = 2.8μA

VIN: 4.3V to 38V, VOUT(MIN) = 1.2V, IQ = 2.8mA, ISD < 1μA, 3mm × 3mm DFN-10,

MSOP-10E

LT3991

55V, 1.2A, 2.2MHz High Efﬁciency MicroPower

Step-Down DC/DC Converter with IQ = 2.8μA

VIN: 4.3V to 55V, VOUT(MIN) = 1.2V, IQ = 2.8mA, ISD < 1μA, 3mm × 3mm DFN-10,

MSOP-10E

LT3480

36V with Transient Protection to 60V, 2A (IOUT),

2.4MHz, High Efﬁciency Step-Down DC/DC

Converter with Burst Mode® Operation

VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-10,

MSOP-10E

LT3685

36V with Transient Protection to 60V, 2A (IOUT),

2.4MHz, High Efﬁciency Step-Down DC/DC

Converter

VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-10,

MSOP-10E

1.8V Step-Down Converter with 0.8V Logic Rail

1μF

3645 TA07

PGOOD

12V

GND

FB2

EN2

VCC2

VIN

EN/UVLO

NPG

OUT2

10μF

1.8V

500mA

0.8V

200mA

ALTERNATE

POWER SOURCE

4.7μH

MBRM140

12.4k

10k

BOOST

LT3645

2.2μF

0.1μF

–

ON OFF

0.1μF

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