LM3404MR

Overview

The LM3404MR is a monolithic switching regulator designed to deliver constant currents to high power LEDs. It operates as a buck converter with an input voltage range of 6 V to 42 V and supports output voltages up to 40 V. The device provides a regulated output current of 1.0 A, adjustable via an external resistor. It features PWM dimming capability for brightness control and includes thermal shutdown protection. The component functions within a frequency range of 10 kHz to 1 MHz and is rated for operation between -40°C and +125°C.

Feature Summary

• Monolithic buck topology for efficient constant current regulation
• Integrated PWM dimming interface for precise brightness control
• Thermal shutdown protection for enhanced system reliability

Applications

• Automotive exterior lighting systems
• Industrial LED illumination fixtures
• High power LED driver circuits

Procurement Notes

Verify the specific suffix 'MR' corresponds to the SO-PowerPAD-8 package variant when sourcing. Confirm RoHS compliance status through official Texas Instruments documentation or authorized distributor declarations. Ensure the ordering part number matches the required tape and reel or cut tape packaging format specified in the manufacturer's catalog.

Selection Notes

Select this component for applications requiring a single-channel 1 A constant current source from a 6 V to 42 V input. It is suitable for designs needing integrated thermal protection and PWM dimming without external logic. Consider the SO-PowerPAD-8 package for thermal management requirements in compact layouts.

Part Context

This device belongs to the LM3404 family of LED drivers manufactured by Texas Instruments. It is specifically engineered for driving high-power LEDs in demanding environments. The MR suffix indicates the specific surface-mount package configuration used for this particular part number within the broader product line.

Replacement Considerations

The LM3404MRX/NOPB is a verified substitute offering identical electrical specifications and functionality. Verify that the replacement part maintains the same SO-PowerPAD-8 package footprint and pinout compatibility for direct integration.