Alternative Parts
Overview
Features and Benefits
- 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)
Product Details
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
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
R518 Reliability Data3/26/2018
-
DC1772A - Demo Manual5/22/2015
-
Accurate PWM LED Dimming without External Signal Generators, Clocks or µControllers10/1/2012 LT Journal
Tools & Simulations
LTspice
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
LT3761
LT3761A
Product Recommendations
LT3761 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT3761EMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761EMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761EMSE-1#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761EMSE-1#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761HMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761HMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761IMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761IMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761IMSE-1#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LT3761IMSE-1#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| Wafer Fabrication Data | R518 Reliability Data |
PCN-PDN Information
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.