MIC3291-18YD6-TR

LED Driver IC Overview

The MIC3291-18YD6-TR is a PWM switching boost regulator optimized for constant current white LED driver applications. It operates with a supply voltage range of 2.5V to 6.5V and delivers a switch current of 1.2A at a frequency of 1.2MHz. The device integrates an internal Schottky diode and supports single-wire dimming. Packaged in a TSOT-23-6, it provides a compact solution for portable electronics requiring efficient WLED illumination.

LED Driver IC Feature Summary

• Integrates an internal Schottky diode to reduce external component count
• Supports single-wire dimming control interface
• Optimized for constant current white LED driving

LED Driver IC Applications

• White LED backlighting in portable devices
• Constant current LED driver circuits
• Boost regulator applications for low-voltage systems

LED Driver IC Procurement Notes

Verify the complete part number including the suffix -TR for tape-and-reel packaging configuration. Confirm the specific output current setting (18mA) matches the design requirements. Ensure compatibility with the TSOT-23-6 package footprint during PCB layout. Cross-reference datasheet revisions to confirm pinout consistency.

LED Driver IC Selection Notes

Select this component when a compact, high-efficiency boost regulator is needed for single white LED strings. The integrated Schottky diode simplifies bill of materials compared to discrete solutions. Verify that the input voltage range of 2.5V to 6.5V aligns with the system power supply. Consider the 1.2A switch current limit for load capacity planning.

LED Driver IC Part Context

This part belongs to the MIC3291 family of LED drivers from Microchip Technology. Variants within the family differ primarily by fixed output current settings, such as 18mA or 25mA. All variants share the same core topology, package style, and functional features, differing only in the programmed output current parameter.

LED Driver IC Replacement Considerations

Direct substitutes include other MIC3291 variants with different current ratings, such as MIC3291-25YD6-TR, provided the LED current requirement differs. Ensure any replacement maintains the TSOT-23-6 package and single-wire dimming capability.

LED Driver IC FAQ

What type of dimming does the MIC3291 support?

The MIC3291 supports single-wire dimming control.

Does the MIC3291 require an external rectifier diode?

No, the device integrates an internal Schottky diode.