LM3406HVQMHQ1

Overview

The LM3406HVQMHQ1 is a high-voltage, automotive-grade LED driver IC manufactured by Texas Instruments. It operates as a buck DC-DC converter with an internal switch, supporting input voltages from 6V to 75V and delivering up to 1.5A output current per channel. The device features adjustable switching frequencies ranging from 10kHz to 1MHz and supports PWM dimming for precise brightness control. Packaged in a 14-HTSSOP surface-mount case, it is designed for robust performance across a wide temperature range of -40°C to 150°C TJ.

Feature Summary

• High voltage operation capability up to 75V input
• Integrated internal power switch for compact design
• Automotive qualification compliant with AEC-Q100 standards
• Supports PWM dimming for accurate light intensity regulation

Applications

• Automotive exterior lighting systems
• LED headlamp drivers
• High-voltage LED string regulation
• Industrial lighting applications requiring high input voltage tolerance

Procurement Notes

Verify the specific suffix QMH against the official datasheet to confirm package type and thermal characteristics. Ensure the component meets AEC-Q100 grade requirements for your target automotive application. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit products. Confirm that the 14-HTSSOP footprint matches your PCB layout constraints before finalizing procurement decisions.

Selection Notes

Select this component when designing circuits requiring high input voltage tolerance up to 75V for LED strings. Consider the 1.5A continuous output current limit for sizing external components. Evaluate the 10kHz to 1MHz frequency range for EMI compliance and inductor selection. Verify that the operating temperature range of -40°C to 150°C aligns with the environmental conditions of the intended installation site.

Part Context

This part belongs to the LM3406 family of LED drivers, specifically the high-voltage variant optimized for automotive use. It differs from standard versions by its extended voltage rating and automotive qualification. The HV designation indicates suitability for higher bus voltages common in modern vehicle electrical architectures. It serves as a dedicated solution for regulating current in series-connected LED arrays without external MOSFETs.

Replacement Considerations

LM3406HVQMHXQ1 is a parameter-equivalent substitute available from Texas Instruments.