LM3431AQMHX/NOPB

Overview

The LM3431AQMHX/NOPB is an automotive-grade, three-channel constant current LED driver IC manufactured by Texas Instruments. It utilizes a boost topology to regulate output currents up to 200 mA per channel from a 5 V to 36 V input supply. The device operates at adjustable switching frequencies between 200 kHz and 1 MHz within a -40°C to +125°C temperature range. Key electrical specifications include a maximum power dissipation of 3.1 W and support for both analog and PWM dimming methods. It is housed in a 28-lead HTSSOP package.

Feature Summary

• Provides independent constant current regulation across three distinct channels for multi-zone LED applications.
• Supports flexible dimming control through dedicated pins accepting both analog voltage levels and pulse-width modulation signals.
• Integrates comprehensive protection mechanisms including thermal shutdown and soft-start functionality to ensure operational reliability.

Applications

• Automotive exterior lighting systems such as headlamps and daytime running lights
• Interior vehicle illumination circuits requiring precise current balancing
• High-reliability industrial LED arrays operating under extreme thermal conditions

Procurement Notes

Verify the specific suffix 'A' indicates automotive qualification compliance before procurement. Confirm that the HTSSOP-28 package variant matches your PCB footprint requirements. Ensure the design supports the required 5 V to 36 V input range and check thermal management needs for the 3.1 W dissipation limit. Cross-reference the datasheet revision date to confirm compatibility with your system constraints.

Selection Notes

Select this component when designing high-voltage LED drivers requiring three independent regulated outputs. It is suitable for applications needing wide input voltage tolerance and integrated protection features. Consider the adjustable frequency range for optimizing external inductor and capacitor sizes. Evaluate the thermal performance within the specified operating temperature range to ensure long-term stability.

Part Context

This part belongs to the LM3431 family of LED drivers designed for robust performance in demanding environments. The 'Q' designation signifies automotive qualification, while the 'HX' suffix denotes tape-and-reel packaging. It serves as a specialized solution for complex lighting architectures where multiple channels must be driven efficiently from a single power source.

Replacement Considerations

LM3431AMHX/NOPB: Non-automotive grade equivalent with identical pinout and electrical characteristics but lacking AEC-Q100 certification.