LM3405XMK

Overview

The LM3405XMK is a constant current buck regulator designed for LED applications, manufactured by Texas Instruments. It operates with an input voltage range of 3V to 15V and delivers a regulated output current of 1A. The device features an internal 1.6MHz switching frequency and supports PWM dimming control. It is housed in a TSOT-23-6 package and functions as a DC-DC step-down converter. The component is rated for junction temperatures between -40°C and 125°C.

Feature Summary

• Integrates an internal power switch for compact design
• Supports high-frequency PWM dimming for brightness control
• Provides constant current regulation for stable LED operation

Applications

• General LED lighting systems
• Portable device backlighting
• Automotive interior illumination

Procurement Notes

Verify the specific suffix configuration when sourcing replacements, as standard variants may differ from discontinued versions. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the selected substitute matches the original pinout and thermal characteristics to maintain circuit integrity during the transition process.

Selection Notes

Select this component for designs requiring a small footprint and efficient buck conversion for single-channel LED loads. Consider the fixed switching frequency when designing passive components to minimize electromagnetic interference. Evaluate the thermal performance within the specified operating temperature range to ensure long-term reliability under varying load conditions.

Part Context

This part belongs to the LM3405 family of LED drivers from Texas Instruments. It is specifically engineered for space-constrained applications where high efficiency and precise current regulation are critical. The TSOT-23-6 packaging allows for automated surface-mount assembly, supporting high-volume manufacturing requirements for consumer and industrial electronics.

Replacement Considerations

LM3405XMK/NOPB