LT3755
LT3755-1
LT3755-2

PRODUCTION

LT3755
LT3755-1
LT3755-2

40V_IN, 75V_OUT LED Controllers

PRODUCTION

LT3755-3755-1-3755-2 Application Circuit slide

LT3755-3755-1-3755-2 Pin Configuration slide

LT3755-3755-1-3755-2 Performance Graph slide

LT3755-3755-1-3755-2 Application Circuit

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 45

1ku List Price Starting From $3.64

Features

3000:1 True Color PWM^™ Dimming
Wide Input Voltage Range: 4.5V to 40V
Output Voltage Up to 75V
Constant-Current and Constant-Voltage Regulation
100mV High Side Current Sense
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology
Adjustable Frequency: 100kHz to 1MHz
Open LED Protection
Programmable Undervoltage Lockout with Hysteresis

Improved Open LED Status Pin (LT3755-2)
Frequency Synchronization (LT3755-1)
PWM Disconnect Switch Driver
CTRL Pin Provides Analog Dimming
Low Shutdown Current: <1µA
Programmable Soft-Start
Thermally Enhanced 16-Lead QFN (3mm × 3mm) and MSOP Packages
AEC-Q100 Qualified For Automotive Applications

Additional Details

The LT3755, LT3755-1 and LT3755-2 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7.15V supply. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size.

The LT3755/LT3755-1/LT3755-2 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability.

Applications

High Power LED
Battery Chargers
Accurate Current Limited Voltage Regulators

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 45

1ku List Price Starting From $3.64

Technical Documents 4

LT3755: 40V_IN, 75V_OUT LED Controllers Data Sheet (Rev.E) 03/30/2010

R518 Reliability Data 03/26/2018

DC1268B - Demo Manual 09/24/2009

LED Driver Powers Halogen Replacement - PSDE May 2009 07/07/2009

Reference Materials 2

MIKROE-5565, Click Board, LED Driver 17 Click

Automotive LED Driver Power Conversion Topology Guide 06/01/2022

Design Resources 45

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3755EMSE#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-1#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-1#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-2#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-2#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#TRMPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-1#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-1#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-2#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-2#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#WPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#WTRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3755EMSE#PBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

LT3755 LT3755-1 LT3755-2

Features

{{modalTitle}}

{{dropdownTitle}}

{{newProjectTitle}}

Documentation

3rd Party Solutions 1

Analog Dialogue 1

Oct 11, 2022

Jul 12, 2022

Jun 21, 2022

Feb 4, 2020

LT3755
LT3755-1
LT3755-2