LM3402HVMMX

Overview

The LM3402HVMMX is a constant current buck LED driver IC from Texas Instruments, designed for high-voltage applications. It features an integrated NFET and supports input voltages up to 75V with a maximum output voltage of 73V. The device delivers a regulated output current of 500mA per channel. Operating frequencies range from 10kHz to 1MHz. It offers PWM dimming capability and operates within a junction temperature range of -40°C to 125°C. The component is housed in an 8-VSSOP surface-mount package.

Feature Summary

• Integrated NFET controlled off-time buck topology for efficient step-down regulation
• Supports wide input voltage range up to 75V for flexible power supply options
• Enables precise LED brightness control through hardware PWM dimming interface

Applications

• General LED lighting systems
• High-voltage LED string drivers
• Industrial illumination fixtures

Procurement Notes

Verify the specific suffix (e.g., NOPB) against the original part number to ensure RoHS compliance and exact pinout compatibility. Confirm that the 8-VSSOP package dimensions match the target PCB footprint. Check manufacturer documentation for any updates regarding lead-free status or environmental declarations prior to final procurement decisions.

Selection Notes

Select this component when designing circuits requiring high input voltage tolerance and constant current regulation for LED strings. Ensure the switching frequency selection aligns with external inductor and capacitor availability. Verify that the thermal performance of the VSSOP package meets the application's heat dissipation requirements under maximum load conditions.

Part Context

This part belongs to the LM3402 family of LED drivers, specifically the high-voltage variant. It serves as a specialized solution for driving LEDs where standard low-voltage regulators are insufficient. The HV designation indicates enhanced breakdown voltage capabilities compared to standard versions.

Replacement Considerations

LM3402HVMM/NOPB is listed as a direct substitute. Verify functional equivalence and package compatibility before substitution.