LM3404HVMRX

Overview

The LM3404HVMRX is a monolithic switching regulator from the LM3404HV series, designed to deliver constant currents to high power LEDs. It operates as a buck regulator with an input voltage range of 6V to 75V DC and a maximum output voltage of 73V. The device provides a regulated output current of 1A, supporting up to 20 LED strings in series. It features PWM dimming capability and operates at frequencies between 10 kHz and 1 MHz. The component is housed in an SO-PowerPad-8 surface-mount package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Monolithic buck regulator topology for driving high power LEDs
• Supports wide input voltage range up to 75V DC
• Enables precise PWM dimming control
• Delivers stable 1A constant current output

Applications

• Automotive lighting systems
• Industrial LED illumination
• High power LED string drivers

Procurement Notes

Verify that the ordering suffix 'MRX' corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm that the part number includes the '/NOPB' designation if lead-free compliance is mandatory for the target application. Ensure the selected variant matches the exact thermal and electrical specifications documented in the official Texas Instruments datasheet.

Selection Notes

Select this component when designing circuits requiring a single-channel constant current source for high-power LED arrays. The wide input voltage range allows flexibility in power supply design, while the integrated buck topology reduces external component count. Consider the thermal performance of the PowerPad package for heat dissipation requirements in compact enclosures.

Part Context

This device belongs to the LM3404 family of LED drivers, which are optimized for high-efficiency constant current regulation. The HV variant specifically extends the input voltage capability compared to standard versions, making it suitable for higher voltage bus applications or longer LED串 configurations without additional boosting stages.

Replacement Considerations

LM3404HVMR/NOPB