LT3743IUFD#TRPBF

LED Driver IC Overview

The LT3743IUFD#TRPBF is a fixed-frequency synchronous step-down DC/DC controller designed for high-current LED driving applications. It operates within an input voltage range of 6V to 36V and supports switching frequencies programmable from 200kHz to 1MHz via an external resistor. The device delivers up to 20A output current in a 28-lead QFN package rated for operation between -40°C and +125°C. It features average current mode control, maintaining regulation over a wide output voltage range from 0V to (VIN minus 2V).

LED Driver IC Feature Summary

• Supports three-state current control for color mixing applications.
• Enables accurate high-speed PWM dimming through externally switched load capacitors.
• Provides analog dimming capabilities on dedicated control pins.

LED Driver IC Applications

• High-current LED lighting systems
• Color mixing LED drivers
• Projector illumination modules

LED Driver IC Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm tape-and-reel packaging and industrial temperature grade specifications. Ensure the ordering part number matches the required package variant and compliance standards before procurement.

LED Driver IC Selection Notes

Select this component when designing synchronous buck converters requiring precise high-current LED regulation. Consider the programmable frequency range and thermal performance of the QFN package relative to the application's power density requirements.

LED Driver IC Part Context

This part belongs to the LT3743 family of high-current synchronous step-down LED drivers. It shares core architecture with variants like the LT3743IFE but differs in package type and reel configuration. The series is optimized for applications demanding stable current regulation across varying input voltages.

LED Driver IC Replacement Considerations

Consult official substitution lists for equivalent parts. Verify pin compatibility and electrical parameters before replacing existing designs with alternative components.

LED Driver IC FAQ

How is PWM dimming achieved on the LT3743?

PWM dimming is implemented using the PWM and CTRL_SEL pins, allowing for high-speed switching between regulated current levels via externally switched load capacitors.

What is the maximum output current capability?

The controller is designed to drive LEDs with an output current of up to 20A.