LM3431MH/NOPB

Overview

The LM3431MH/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 an adjustable switching frequency from 200 kHz to 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 operates reliably across a temperature range of -40°C to +125°C.

Feature Summary

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

Applications

• General LED lighting systems requiring multi-channel control
• Backlighting applications for displays
• Automotive interior lighting modules

Procurement Notes

Verify the specific suffix NOPB indicates lead-free and RoHS compliance status according to the manufacturer's latest documentation. Confirm the HTSSOP-28 package dimensions match the target PCB footprint design requirements. Ensure the operating environment stays within the specified -40°C to +125°C junction temperature limits for reliable performance.

Selection Notes

Select this component when a boost converter 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 sensing resistors for each path. Consider the maximum input voltage of 36 V and the 200 mA output capability against the total load requirements of the application.

Part Context

This part belongs to the LM3431 series of LED drivers designed for high-efficiency illumination. It serves as a specialized power management integrated circuit within the broader category of LED lighting drivers. The device integrates switching control and driver stages to simplify the design of compact LED power supplies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.