LT3761/LT3761-1 - 60VIN LED Controller with Internal PWM Generator

Features

  • 3000:1 True Color PWM™ Dimming for LEDs
  • Wide VIN 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 VIN UVLO 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)
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3761 Typical Application
LT3761 Typical Application

Description

The LT®3761/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.

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

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3761EMSE-1#PBF MS-16E MSE E 05-08-1667 Yes
LT3761EMSE-1#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3761EMSE#PBF MS-16E MSE E 05-08-1667 Yes
LT3761EMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3761HMSE#PBF MS-16E MSE H 05-08-1667 Yes
LT3761HMSE#TRPBF MS-16E MSE H 05-08-1667 Yes
LT3761IMSE-1#PBF MS-16E MSE I 05-08-1667 Yes
LT3761IMSE-1#TRPBF MS-16E MSE I 05-08-1667 Yes
LT3761IMSE#PBF MS-16E MSE I 05-08-1667 Yes
LT3761IMSE#TRPBF MS-16E MSE I 05-08-1667 Yes


LT3761 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3761EMSE-1#PBF MS-16E E $4.57 $3.20 Yes
LT3761EMSE-1#TRPBF MS-16E E $4.63 $3.26 Yes
LT3761EMSE#PBF MS-16E E $4.57 $3.20 Yes
LT3761EMSE#TRPBF MS-16E E $4.63 $3.26 Yes
LT3761HMSE#PBF MS-16E H $5.50 $3.85 Yes
LT3761HMSE#TRPBF MS-16E H $5.56 $3.91 Yes
LT3761IMSE-1#PBF MS-16E I $5.07 $3.55 Yes
LT3761IMSE-1#TRPBF MS-16E I $5.13 $3.61 Yes
LT3761IMSE#PBF MS-16E I $5.07 $3.55 Yes
LT3761IMSE#TRPBF MS-16E I $5.13 $3.61 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1772A LT3761EMSE Demo Board I Boost LED Controller, Internal PWM Dimming, 8V to 60VIN, VOUT up to 60V $175.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3761HMSE#PBF MS-16E H $5.50 $3.85 Yes
LT3761HMSE#TRPBF MS-16E H $5.56 $3.91 Yes
LT3761IMSE#PBF MS-16E I $5.07 $3.55 Yes
LT3761IMSE#TRPBF MS-16E I $5.13 $3.61 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

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

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Design Tools

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LT3761
LT3761A

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