LM3409N/NOPB

Overview

The LM3409N/NOPB is a P-FET Buck Controller designed for high-power LED driver applications. It operates within an input voltage range of 6 V to 42 V and supports output currents up to 5 A. The device features an adjustable switching frequency from 300 kHz to 1 MHz, enabling optimization for efficiency and component size. It includes precision dimming control, thermal shutdown protection, and enable/shutdown functionality. The controller is housed in a 14-PDIP package and is qualified to AEC-Q100 standards for automotive reliability.

Feature Summary

• Integrates precision current regulation with analog dimming control capabilities
• Includes built-in thermal shutdown protection for enhanced system safety
• Supports adjustable switching frequencies to optimize external component selection

Applications

• High-power LED lighting systems
• Automotive exterior lighting modules
• Industrial LED illumination fixtures

Procurement Notes

Verify the specific package type upon ordering, as the LM3409 family includes both MSOP and PDIP variants. Confirm that the requested part corresponds to the 14-PDIP configuration rather than surface-mount options. Ensure compatibility with AEC-Q100 requirements if used in automotive contexts. Cross-reference datasheet revisions to confirm feature consistency. Validate supply chain sources for genuine Texas Instruments components to avoid counterfeit risks.

Selection Notes

Select this controller when a through-hole DIP package is required for prototyping or specific mechanical constraints. Compare against the LM3409QMY variant if surface-mount assembly is preferred for production volumes. Consider the maximum input voltage limits relative to the power source architecture. Evaluate the need for external P-FET drivers versus integrated solutions in other family members. Assess thermal management requirements based on the 5 A output capability.

Part Context

This component belongs to the LM3409 series of LED lighting driver ICs from Texas Instruments. The series provides buck controller solutions for various LED applications. The LM3409N/NOPB specifically offers a PDIP package option, distinguishing it from the more common MSOP versions like the LM3409QMY. It shares core functionalities such as dimming control and thermal protection with its siblings while differing primarily in physical packaging and pinout configuration.

Replacement Considerations

LM3409QMY/NOPB serves as a direct functional substitute with identical electrical characteristics but utilizes an MSOP-PowerPad-10 package instead of the 14-PDIP form factor.