LT3743
LT3743
PRODUCTIONHigh Current Synchronous Step-Down LED Driver with Three-State Control
- Part Models
- 8
- 1ku List Price
- Starting From $7.24
Viewing:
Overview
- PWM Dimming Provides Up to 3000:1 Dimming Ratio
- CTRL_SEL Dimming Provides Up to 3000:1 Dimming Ratio Between Any Current
- Three-State Current Control for Color Mixing
- ±6% Current Regulation Accuracy
- 6V to 36V Input Voltage Range
- Average Current Mode Control
- 2μs Maximum Recovery Time Between Any Current Regulation State
- <1μA Shutdown Current
- Output Voltage Regulation and Open-LED Protection
- Thermally Enhanced 4mm × 5mm QFN and 28-Pin FE Package
The LT3743 is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. The average current mode controller will maintain inductor current regulation over a wide output voltage range of 0V to (VIN – 2V). LED dimming is achieved through analog dimming on the CTRL_L, CTRL_H and CTRL_T pins and with PWM dimming on the PWM and CTRL_SEL pins. Through the use of externally switched load capacitors, the LT3743 is capable of changing regulated LED current levels within several μs, providing accurate, high speed PWM dimming between two current levels. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin.
Additional features include voltage regulation and overvoltage protection set with a voltage divider from the output to the FB pin. Overcurrent protection is provided and set by the CTRL_H pin.
Applications
- DLP Projectors
- High Power Architectural Lighting
- Laser Diodes
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Video 2
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 |
|---|---|---|---|
| LT3743EFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3743EFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LT3743EUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3743EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3743IFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3743IFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LT3743IUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3743IUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3743EFE#PBF | PRODUCTION | |
| LT3743EFE#TRPBF | PRODUCTION | |
| LT3743IFE#PBF | PRODUCTION | |
| LT3743IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3743EFE#PBF | PRODUCTION | |
| LT3743EFE#TRPBF | PRODUCTION | |
| LT3743IFE#PBF | PRODUCTION | |
| LT3743IFE#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LT3743EUFD#PBF | PRODUCTION | |
| LT3743EUFD#TRPBF | PRODUCTION | |
| LT3743IUFD#PBF | PRODUCTION | |
| LT3743IUFD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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| Temperature Sensors 1 | ||
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3743
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
LT3743EUF Demo Board | High Current Step-Down LED Driver Controller, 6.5V ≤ VIN ≤ 24V, VLED = 6V @ 20A