LM3406MHX/NOPB

Overview

The LM3406MHX/NOPB is a constant current buck LED driver IC manufactured by Texas Instruments. It operates with an input voltage range of 6 V to 42 V and delivers a maximum output current of 1.5 A. The device features an adjustable switching frequency from 10 kHz to 1 MHz and supports PWM dimming for brightness control. It utilizes a 14-lead HTSSOP package with exposed thermal pad. The component functions as a DC-DC regulator with internal switches, suitable for high-efficiency lighting applications across a junction temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-side N-channel power switch within the controller for simplified external component count.
• Provides precise constant current regulation to maintain consistent LED brightness regardless of input variations.
• Supports wide-range PWM dimming control allowing for effective light intensity adjustment without color shift.

Applications

• Automotive interior and exterior lighting systems
• General solid-state lighting fixtures
• High-brightness LED arrays

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest datasheet to ensure correct packaging and tape-and-reel specifications. Confirm that the HTSSOP-14 package variant matches the target PCB footprint requirements. Check for any recent product change notifications regarding wire composition or assembly location updates prior to finalizing procurement orders.

Selection Notes

Select this component when a compact solution for driving single-string LEDs from a 6V to 42V source is required. Ensure the application demands a switching frequency compatible with the 10kHz to 1MHz programmable range. Verify that the thermal performance of the 14-HTSSOP package can dissipate heat effectively under the expected load conditions and ambient temperatures.

Part Context

This part belongs to the LM3406 series of LED drivers designed for efficient power management in lighting applications. It serves as a cost-effective alternative to discrete solutions by integrating control logic and power switching into a single small-footprint package. The series is widely used in designs requiring reliable constant current drive for white LEDs.

Replacement Considerations

Direct pin-to-pin replacements are limited within the same family. Consider the LM3406MH (without NOPB) for identical electrical characteristics but verify RoHS compliance status. For higher voltage inputs, evaluate the LM3406HV series, though package and pinout differences may require schematic redesign.