IS32LT3140A-ZLA3-TR

Overview

The IS32LT3140A-ZLA3-TR is an automotive-grade, single-channel linear constant current LED driver IC manufactured by Lumissil Microsystems. It provides a programmable output current of up to 450mA with ±8% accuracy across the -40°C to +150°C temperature range. The device operates within a wide input voltage range of 4.5V to 40V and features a low dropout headroom voltage of maximum 700mV at 150mA. It supports PWM dimming via a dedicated pin or power supply modulation (PSM). The IC integrates fault detection for single LED shorts, LED string open/short conditions, and over-temperature events, reporting status through an active-low FaultB pin. It is housed in a thermally enhanced eTSSOP-14 package.

Feature Summary

• Single-channel high-side current regulation with external resistor programming
• Integrated fault protection including single LED short, string open/short, and over-temperature detection
• Dual dimming capability supporting both PWM pin control and power supply modulation
• Active-low open-drain FaultB pin enabling 'one-fail-all-fail' multi-device configurations

Applications

• Automotive interior lighting systems
• Automotive exterior lighting applications
• 12V automotive LED string drivers

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number IS32LT3140A-ZLA3-TR with official Lumissil documentation. Confirm the specific suffix ZLA3 corresponds to the required tape and reel packaging format. Ensure the ordering information matches the exact thermal performance requirements associated with the eTSSOP-14 package. Validate that the procurement source provides valid traceability records consistent with automotive-grade quality standards.

Selection Notes

Select this component for designs requiring a single-channel linear LED driver with robust fault reporting capabilities. The device is suitable for applications needing precise current regulation with minimal headroom voltage drop. Consider the integrated thermal shunt resistor option if optimizing power dissipation is critical. Verify compatibility with the system's PWM frequency and under-voltage lockout thresholds before implementation.

Part Context

This part belongs to the IS32LT series of automotive-grade linear LED drivers from Lumissil Microsystems. The series focuses on high-side current regulation for reliable operation in demanding automotive environments. The IS32LT3140A specifically addresses single-channel applications, distinguishing itself from multi-channel variants in the family by offering simplified configuration for individual LED strings while maintaining comprehensive fault monitoring.

Replacement Considerations

No public confirmed substitute part numbers are available.