LT3761
LT3761-1

PRODUCTION

60V_IN LED Controller with Internal PWM Generator

Part Models: 10
1ku List Price: Starting From $3.84

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Part Details

3000:1 True Color PWM^™ Dimming for LEDs
Wide V_IN Range: 4.5V to 60V
Rail-to-Rail Current Sense Range: 0V to 80V
Programmable PWM Dimming Signal Generator
Constant Current (±3%) and Constant-Voltage (±2%) Regulation
Analog Dimming
Drives LEDs in Boost, SEPIC, Inverting, Buck Mode, Buck-Boost Mode, or Flyback Configuration
Output Short-Circuit Protected Boost
Open LED Protection
Adjustable Switching Frequency: 100kHz to 1MHz
Programmable V_INUVLO with Hysteresis
C/10 Indication for Battery Chargers
Low Shutdown Current: <1μA
Thermally Enhanced 16-Lead MSOP Package
Open LED Status Pin (LT3761)
Frequency Synchronization (LT3761-1)

The LT3761/LT3761-1 is a DC/DC controller designed to operate as a constant-current source and constant-voltage regulator. It features a programmable internal PWM dimming signal. The LT3761/LT3761-1 is ideally suited for driving high current LEDs, but also has features to make it suitable for charging batteries and supercapacitors. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback 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 LT3761-1 can be synchronized to an external clock. The LT3761/LT3761-1 senses output current at the high side or at the low side of the load. The PWM input can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4% to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1. The CTRL input provides additional analog dimming capability.

The LT3761/LT3761-1 senses output current at the high side or at the low side of the load. The PWM input can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4% to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1. The CTRL input provides additional analog dimming capability.


	NOTES
LT3761A	Higher PWM Dimming Accuracy at Lower LED Current Levels
LT3761-1	Frequency Synchronization
LT3761	Open LED Status Pin

Applications

High Voltage LED Strings >100V with Ground Referred Current Sense
Grounded Anode LEDs
Accurate Current Limited Voltage Regulators

Part Models: 10
1ku List Price: Starting From $3.84

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
LT3761EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761EMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761EMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761IMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3761IMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LT3761EMSE#PBF	PRODUCTION
LT3761EMSE#TRPBF	PRODUCTION
LT3761EMSE-1#PBF	PRODUCTION
LT3761EMSE-1#TRPBF	PRODUCTION
LT3761HMSE#PBF	PRODUCTION
LT3761HMSE#TRPBF	PRODUCTION
LT3761IMSE#PBF	PRODUCTION
LT3761IMSE#TRPBF	PRODUCTION
LT3761IMSE-1#PBF	PRODUCTION
LT3761IMSE-1#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3761EMSE#PBF	PRODUCTION
LT3761EMSE#TRPBF	PRODUCTION
LT3761EMSE-1#PBF	PRODUCTION
LT3761EMSE-1#TRPBF	PRODUCTION
LT3761HMSE#PBF	PRODUCTION
LT3761HMSE#TRPBF	PRODUCTION
LT3761IMSE#PBF	PRODUCTION
LT3761IMSE#TRPBF	PRODUCTION
LT3761IMSE-1#PBF	PRODUCTION
LT3761IMSE-1#TRPBF	PRODUCTION
Jul 19, 2021 - 21_0140 LT3761/LT3761-1/LT3761A Data Sheet Limit Change
		PCN21_0140_Form Material_Report Detailed Change Description Detailed Change Description Datasheet Specification Comparison Datasheet Specification Comparison Delta Qualification Matrix
LT3761EMSE#PBF	PRODUCTION
LT3761EMSE#TRPBF	PRODUCTION
LT3761EMSE-1#PBF	PRODUCTION
LT3761EMSE-1#TRPBF	PRODUCTION
LT3761HMSE#PBF	PRODUCTION
LT3761HMSE#TRPBF	PRODUCTION
LT3761IMSE#PBF	PRODUCTION
LT3761IMSE#TRPBF	PRODUCTION
LT3761IMSE-1#PBF	PRODUCTION
LT3761IMSE-1#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
LT3761EMSE#PBF	PRODUCTION
LT3761EMSE#TRPBF	PRODUCTION
LT3761EMSE-1#PBF	PRODUCTION
LT3761EMSE-1#TRPBF	PRODUCTION
LT3761HMSE#PBF	PRODUCTION
LT3761HMSE#TRPBF	PRODUCTION
LT3761IMSE#PBF	PRODUCTION
LT3761IMSE#TRPBF	PRODUCTION
LT3761IMSE-1#PBF	PRODUCTION
LT3761IMSE-1#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
High Voltage Hot Swap Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
PWM to Voltage Output D/A Converters 1
LTC2645	PRODUCTION	Quad 12-/10-/8-Bit PWM to V_OUT DACs with 10ppm/°C Reference

Parts	Product Life Cycle	Description
LT3761A	PRODUCTION	60V_IN LED Controller with Internal PWM Generator

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3761
LT3761A

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

LT3761EMSE Demo Board I Boost LED Controller, Internal PWM Dimming, 8V to 60VIN, VOUT up to 60V

Buy Now View Details

Product Details

DC1772A is a high voltage LED controller with internal PWM dimming. It generates its own PWMOUT waveform for accurate PWM dimming with up to 25:1 brightness ratio. It accepts an input voltage from 8V to 60V (8V UVLO and 9.1V rising turn-on), and drives up to 60V of LEDs at 1A (when PVIN is less than V_LED).

DC1772A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed. DC1772A features high efficiency at 350kHz switching frequency. At high LED string voltages up to 60V and 1A of LED current, the single switch controller has 94% efficiency. The open LED overvoltage protection uses the IC’s constant voltage regulation loop to regulate the output to approximately 69.8V if the LED string is opened although it may reach 74V peak during transient from running LEDs to open. The maximum LED string voltage can be raised from 60V to 65V (or higher) with a simple charge of feedback resistors.

Resources

DC1772A - Demo Manual
5/22/2015

DC1772A - Schematic
10/10/2012

DC1772A - Design Files
10/10/2012

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