LT3909EDD#TRPBF

LED Driver IC Overview

The LT3909EDD#TRPBF is a dual-string LED driver IC from Analog Devices Inc., designed for high-efficiency lighting applications. It integrates a fixed 2MHz step-up DC/DC converter capable of driving up to 36V of LEDs. The device features two independent current-regulated outputs, each supporting up to 60mA per string with precise current matching capabilities. Packaged in a compact 12-DFN (3x3) surface-mount case with an exposed pad for thermal dissipation, it supports both analog and PWM dimming methods. This component serves as the core controller for the DC2176A evaluation board.

LED Driver IC Feature Summary

• Integrates a fixed 2MHz step-up DC/DC converter for efficient boost regulation
• Provides two independent current-regulated outputs with matched current capability
• Supports combined analog and PWM dimming control interfaces
• Capable of driving LED loads with total voltage up to 36V

LED Driver IC Applications

• High-efficiency LED lighting systems requiring dual-string drive
• Portable battery-powered lighting devices utilizing boost topology
• Industrial or automotive illumination modules needing precise current matching
• Evaluation and prototyping using the DC2176A reference design

LED Driver IC Procurement Notes

Verify that the specific suffix #TRPBF corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the 12-DFN package dimensions align with the target PCB footprint and thermal management strategy. Ensure compatibility with the intended input voltage range of 7V to 36V for the specific application environment. Cross-reference the manufacturer's latest datasheet to confirm pinout integrity and electrical specifications before finalizing procurement orders.

LED Driver IC Selection Notes

Select this component when a single-chip solution is needed for dual-string LED applications requiring high efficiency and precise current regulation. It is suitable for designs where space constraints favor a small 12-DFN package over larger alternatives. Consider its fixed 2MHz switching frequency for EMI management and passive component size optimization. Evaluate the need for combined analog and PWM dimming support against the system's control architecture requirements.

LED Driver IC Part Context

This part belongs to the LT3909 family of LED drivers, which are engineered for high-performance lighting solutions. It is functionally related to other variants such as LT3909IMSE and LT3909IDD, differing primarily in package type and shipping configuration. The component is actively supported by Analog Devices Inc. and is utilized in evaluation platforms like the DC2176A to demonstrate its capabilities in non-isolated output configurations.

LED Driver IC Replacement Considerations

Direct substitutes within the same family include LT3909EDD#PBF for tube packaging or LT3909IMSE#PBF for MSOP packaging. Verify that any alternative maintains the 12-DFN form factor if PCB layout changes are not permitted. Ensure that the replacement part retains the 60mA output current rating and 2MHz switching frequency to preserve system performance.