LT3743

PRODUCTION

High Current Synchronous Step-Down LED Driver with Three-State Control

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Part Models
8
1ku List Price
Starting From $5.72
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Part Details

  • 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
LT3743
High Current Synchronous Step-Down LED Driver with Three-State Control
92% Efficient 20A LED Driver Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Temperature Sensors 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
Multichannel Voltage Output D/A Converters 1
LTC2657
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TimerBlox 1
LTC6992
TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3743
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.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1470A

LT3743EUF Demo Board | High Current Step-Down LED Driver Controller, 6.5V ≤ VIN ≤ 24V, VLED = 6V @ 20A

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Product Details

Demonstration circuit 1470 is a High Current Synchronous Step-Down LED Driver with Three-State Control featuring the LT3743EUFD. The demo board is optimized for 20A output from a 12V input. Being an LED driver, the output current is regulated until the output voltage reaches a programmed voltage limit. The voltage limit on this demo board is set to around 6V by resistors R5 and R6. The 6V is chosen because of the 6.3V voltage rating of the output capacitors.


The ideal load to be used with this demo board is a single LED, such as PT120 from Luminus Devices. The input voltage range of the LT3743 is 6V to 36V; however, the demo board utilizes 30V MOSFETs to demonstrate best efficiency, so the maximum recommended input voltage is 24V for the demo board.
DC1470A
LT3743EUF Demo Board | High Current Step-Down LED Driver Controller, 6.5V ≤ VIN ≤ 24V, VLED = 6V @ 20A
DC1470A Demo Board DC1470A Demo Board DC1470A Demo Board DC1470A Demo Board DC1470A - Schematic

Latest Discussions

7 Weeks Ago
RE: LT3743 Current Rising Problem (at Strobe drive, 20A)
2 Years Ago
Simple solution to drive 30W LED
2 Years Ago
LT3743EUFD - SW Pin is burning out
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