LM3404HVMRX

Updated: 2026-07-15

Overview

The LM3404HVMRX is a high-performance buck regulator specifically designed for driving LEDs with constant current. It operates over a wide input voltage range, making it versatile for various lighting applications. The device integrates advanced features such as thermal shutdown and cycle-by-cycle current limiting, ensuring reliable operation under demanding conditions. Manufactured by Texas Instruments, the LM3404HVMRX is widely used in industrial, automotive, and architectural lighting systems. Its compact form factor and high efficiency (up to 95%) make it a preferred choice for designers seeking robust LED driver solutions.

Structure and Working Principle

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The LM3404HVMRX is based on a buck converter topology, which steps down the input voltage to a lower level suitable for driving LEDs. The device includes an integrated N-channel MOSFET, reducing external component count and simplifying design. A feedback loop maintains constant current output, ensuring consistent LED brightness. The regulator operates in a pulse-width modulation (PWM) mode, adjusting the duty cycle to regulate output current. Internal protection circuits monitor temperature and current, shutting down the device if thresholds are exceeded. This safeguards both the IC and the connected LEDs from damage due to overheating or overcurrent.

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Key Features

The LM3404HVMRX offers a wide input voltage range of 6V to 42V, accommodating various power supply configurations. Its high switching frequency (up to 1 MHz) allows for smaller external inductors and capacitors, reducing board space and cost. The device also features a dimming control input, enabling brightness adjustment via PWM signals. Efficiency is a standout feature, with typical values exceeding 90%. This minimizes power loss and heat generation, critical for energy-sensitive applications. The IC's thermal shutdown and overcurrent protection mechanisms enhance system reliability, particularly in harsh environments like automotive lighting.

Application Areas

Industrial lighting systems benefit from the LM3404HVMRX's robustness and efficiency, particularly in high-bay fixtures and outdoor luminaires. Automotive applications include interior lighting, daytime running lights (DRLs), and auxiliary lighting, where reliability under varying voltage conditions is essential. Architectural and decorative lighting also utilize this driver for its precise current control and dimming capabilities. Additionally, it is suitable for portable lighting equipment, where compact size and energy efficiency are paramount. The device's versatility makes it a go-to solution for diverse LED driving needs.

Maintenance and Precautions

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Proper heat management is crucial for the LM3404HVMRX's longevity. Ensure adequate PCB copper area or heatsinking to dissipate heat effectively. Avoid exceeding the maximum input voltage (42V) or output current specifications to prevent damage. When designing the circuit, follow the manufacturer's layout guidelines to minimize noise and ensure stable operation. Use quality external components, such as low-ESR capacitors and high-saturation-current inductors, to optimize performance. Regularly inspect the system for signs of overheating or component degradation.

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B2B Procurement Guide

When procuring the LM3404HVMRX, verify the supplier's authenticity to avoid counterfeit parts. Texas Instruments authorized distributors are recommended for guaranteed quality. Bulk purchases typically offer cost savings, with prices ranging approximately $1.50 to $3.00 per unit depending on quantity. Evaluate lead times, especially for large orders, as supply chain fluctuations may affect availability. Request samples for testing before committing to large volumes. Ensure compatibility with your application's voltage and current requirements, and consider alternate part numbers (e.g., LM3404) if the HVMRX variant is unavailable.