LT3743IUFD#PBF

LED Driver IC Overview

The LT3743IUFD#PBF is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. It operates with an input voltage range of 6V to 36V and supports output currents up to 20A. The device features a programmable switching frequency from 200kHz to 1MHz via an external resistor. It includes analog and PWM dimming capabilities, offering a dimming ratio up to 3000:1. The controller provides three-state current control for color mixing applications and includes overcurrent protection set by the CTRL_H pin. It is housed in a 28-QFN (4x5) package.

LED Driver IC Feature Summary

• Three-state current control enables accurate color mixing by allowing rapid changes between regulated LED current levels.
• Supports both analog dimming on CTRL_L, CTRL_H, and CTRL_T pins and PWM dimming on PWM and CTRL_SEL pins.
• Integrated overvoltage protection set via a voltage divider from the output to the feedback pin.

LED Driver IC Applications

• High current LED lighting systems
• Color mixing applications requiring precise current control
• General purpose LED drivers

LED Driver IC Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct manufacturer channels. Confirm the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Check for recent production change notifications regarding assembly sites or material declarations. Ensure the 28-QFN package matches your PCB footprint requirements before finalizing orders.

LED Driver IC Selection Notes

Select this controller when high efficiency synchronous buck topology is required for LED driving. Consider the 20A output capability and wide input voltage range for robust design margins. Evaluate the need for three-state control if dynamic color mixing is necessary. Ensure the external resistor selection aligns with the desired switching frequency within the 200kHz to 1MHz range.

LED Driver IC Part Context

This part belongs to the LT3743 series of high-current synchronous step-down LED drivers. It shares functional similarities with other members like the LT3743IFE#PBF but differs in package type, utilizing a 28-QFN form factor instead of TSSOP-28. The series is characterized by average current mode control and integrated dimming features for professional lighting applications.

LED Driver IC Replacement Considerations

LT3743IFE#PBF is a pin-compatible alternative in a different package. LT3743IUFDTRPBF offers the same functionality in tape-and-reel packaging. Verify electrical parameters and thermal performance when substituting packages.