LT3761A - 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 and Reporting
  • 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

Typical Application

LT3761A Typical Application
LT3761A Typical Application

Description

The LT®3761A 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 LT3761A 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 LT3761A 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%. The LT3761A offers improved accuracy of internal PWM dimming over LT3761. 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
LT3761AEMSE#PBF MS-16E MSE E 05-08-1667 Yes
LT3761AEMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3761AIMSE#PBF MS-16E MSE I 05-08-1667 Yes
LT3761AIMSE#TRPBF MS-16E MSE I 05-08-1667 Yes


LT3761A 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
LT3761AEMSE#PBF MS-16E E $4.57 $3.20 Yes
LT3761AEMSE#TRPBF MS-16E E $4.63 $3.26 Yes
LT3761AIMSE#PBF MS-16E I $5.07 $3.55 Yes
LT3761AIMSE#TRPBF MS-16E I $5.13 $3.61 Yes
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* 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.

Click here to view our complete list of demo boards

Applications

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

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT3761
LT3761A

Technical Support