LT3755
LT3755-1
LT3755-2

PRODUCTION

40V_IN, 75V_OUT LED Controllers

Data Sheet (Rev. E)

Part Models: 45
1ku List Price: Starting From $3.64

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Part Details

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

Part Models: 45
1ku List Price: Starting From $3.64

Documentation

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	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-1#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EMSE-2#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-1#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-1#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-2#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755EUD-2#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755HMSE-2#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#TRMPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-1#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IMSE-2#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-1#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-1#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-2#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755IUD-2#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3755JMSE-2#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN
No Match Found
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3755EMSE#PBF	PRODUCTION
LT3755EMSE#TRPBF	PRODUCTION
LT3755EMSE#WPBF	PRODUCTION
LT3755EMSE#WTRPBF	PRODUCTION
LT3755EMSE-1#WPBF	PRODUCTION
LT3755EMSE-1#WTRPBF	PRODUCTION
LT3755EMSE-2#WPBF	PRODUCTION
LT3755EMSE-2#WTRPBF	PRODUCTION
LT3755IMSE-2#WPBF	PRODUCTION
LT3755IMSE-2#WTRPBF	PRODUCTION
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]
		PCN22_0157_Form Material_Report Qualification Results Summary Delta Qualification Matrix Detailed Parts List
LT3755EMSE#PBF	PRODUCTION
LT3755EMSE#TRPBF	PRODUCTION
LT3755EMSE#WPBF	PRODUCTION
LT3755EMSE#WTRPBF	PRODUCTION
LT3755HMSE-2#WPBF	PRODUCTION
LT3755HMSE-2#WTRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3755EMSE#PBF	PRODUCTION
LT3755EMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LT3755EMSE#PBF	PRODUCTION
LT3755EMSE#TRPBF	PRODUCTION
LT3755EMSE#WPBF	PRODUCTION
LT3755EMSE#WTRPBF	PRODUCTION
LT3755EMSE-1#PBF	PRODUCTION
LT3755EMSE-1#TRPBF	PRODUCTION
LT3755EMSE-1#WPBF	PRODUCTION
LT3755EMSE-1#WTRPBF	PRODUCTION
LT3755EMSE-2#PBF	PRODUCTION
LT3755EMSE-2#TRPBF	PRODUCTION
LT3755EMSE-2#WPBF	PRODUCTION
LT3755EMSE-2#WTRPBF	PRODUCTION
LT3755HMSE-2#PBF	PRODUCTION
LT3755HMSE-2#TRPBF	PRODUCTION
LT3755HMSE-2#WPBF	PRODUCTION
LT3755HMSE-2#WTRPBF	PRODUCTION
LT3755IMSE#PBF	PRODUCTION
LT3755IMSE#TRPBF	PRODUCTION
LT3755IMSE#WPBF	PRODUCTION
LT3755IMSE#WTRPBF	PRODUCTION
LT3755IMSE-1#PBF	PRODUCTION
LT3755IMSE-1#TRMPBF	Obsolete
LT3755IMSE-1#TRPBF	PRODUCTION
LT3755IMSE-1#WPBF	PRODUCTION
LT3755IMSE-1#WTRPBF	PRODUCTION
LT3755IMSE-2#PBF	PRODUCTION
LT3755IMSE-2#TRPBF	PRODUCTION
LT3755IMSE-2#WPBF	PRODUCTION
LT3755IMSE-2#WTRPBF	PRODUCTION
LT3755JMSE-2#PBF	PRODUCTION
LT3755JMSE-2#TRPBF	PRODUCTION
LT3755JMSE-2#WPBF	PRODUCTION
LT3755JMSE-2#WTRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Digital to Analog Converters 1
LTC2654	PRODUCTION	Quad 16-/12-Bit Rail-to-Rail DACs with 10ppm/°C Max Reference
Protection Switches & Controllers 1
LT4320 LT4320-1		Ideal Diode Bridge Controller
Pulse & PWM Generators 1
LTC6992		TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)

Tools & Simulations

LTspice 4

Models for the following parts are available in LTspice:

LT3755
LT3755-1
LT3755-2

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LT3755EUD-2 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 40V, VLED up to 54V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1268B is a high voltage and high current LED driver controller featuring the multitopology, constant current, constant voltage LT3755-2 (1268B-A) or LT3755-1 (1268B-B). The LT3755-2 features an OPEN LED status pin, while the LT3755-1 allows external frequency synchronization. The demonstration circuit is assembled as a boost topology with an 8V to 40V input voltage range, 1A LED current and up to 54V LED forward voltage.

The DC 1268B features PWM dimming, analog dimming, shutdown, and open LED overvoltage protection. Open circuit LED protection clamps the LED voltage at 56V, though the ICs can provide an output voltage up to 75V.