LM3431AMH/NOPB

Overview

The LM3431AMH/NOPB is a three-channel constant current LED driver IC manufactured by Texas Instruments. It utilizes a boost topology to drive LEDs with an output current of 200 mA per channel. The device operates within an input voltage range of 5 V to 36 V and supports adjustable switching frequencies between 200 kHz and 1 MHz. It features analog and PWM dimming capabilities, soft start, thermal shutdown, and enable/shutdown functions. The component is housed in an HTSSOP-28 package and is rated for operation from -40°C to +125°C.

Feature Summary

• Provides three independent constant current channels for driving LED loads
• Supports both analog and pulse-width modulation (PWM) dimming methods
• Integrates thermal shutdown and soft start protection mechanisms

Applications

• LED lighting systems requiring multi-channel current regulation
• Automotive interior or exterior illumination circuits
• Industrial display backlighting applications

Procurement Notes

Verify the specific suffix 'AMH' against the manufacturer's official datasheet to confirm automotive qualification status and temperature rating. Ensure the ordering part number matches the exact package type and tape/reel specifications required for your assembly process. Cross-reference the RoHS compliance details provided in the latest product documentation before finalizing procurement.

Selection Notes

Select this component when a boost topology is required for driving multiple LED strings from a single power source. It is suitable for designs needing precise current matching across three channels without external sense resistors for each path. Consider the operating temperature range and package thermal performance relative to the expected ambient conditions of the target application environment.

Part Context

This device belongs to the LM3431 series of LED drivers from Texas Instruments. It is designed as a high-efficiency solution for managing multiple LED channels in compact spaces. The family focuses on simplifying design through integrated control loops and protection features, reducing the need for external components typically required in discrete LED driver implementations.

Replacement Considerations

Consult the manufacturer's replacement guide for verified cross-references. Verify pin compatibility and electrical parameters before substituting.