IS32LT3128-ZLA3-TR

Overview

The IS32LT3128-ZLA3-TR is a linear LED driver IC manufactured by Lumissil Microsystems. It features three output channels, including two high-current drivers rated at 150 mA and one low-current driver for button backlighting. The device supports PWM dimming with a fade-on/fade-off function and prioritizes button inputs over PWM signals. It operates within a supply voltage range of 5 V to 24 V and is housed in a 20-pin eTSSOP package with exposed pad.

Feature Summary

• Three-channel architecture with dedicated high-current outputs for main LEDs and a separate channel for button illumination
• Supports pulse-width modulation (PWM) dimming with integrated fade-on and fade-off timing control
• Hardware priority logic ensures button backlight activation overrides active PWM dimming states

Applications

• Automotive interior lighting systems requiring button backlights
• Dashboard instrument clusters with multi-function display controls
• Infotainment system interface panels with tactile feedback keys

Procurement Notes

Verify the specific suffix against the manufacturer's latest datasheet to confirm pinout compatibility and thermal characteristics. Ensure the ordering quantity aligns with standard reel packaging requirements. Confirm that the application circuit design accounts for the linear regulation heat dissipation limits specified in the electrical characteristics table.

Selection Notes

Select this component when a single IC solution is required to drive both primary illumination and user interface buttons. The integrated fade functionality reduces external component count compared to discrete solutions. Verify that the load current requirements do not exceed the 150 mA per channel limit for the primary outputs.

Part Context

This part belongs to the IS32LT series of linear LED drivers designed for automotive applications. It complements other channel variants in the family by offering a specific mix of high and low current outputs tailored for complex control panels where distinct brightness levels are needed for different functional zones.

Replacement Considerations

Check for IS32LT3128A-ZLA3-TR as a potential variant. Verify if the 'A' suffix indicates an updated revision or minor parameter shift before substitution.