IS32LT3140B-ZLA3-TR

Overview

The IS32LT3140B-ZLA3-TR is an automotive-grade, single-channel high-side linear constant current LED driver from Lumissil Microsystems. It supports a wide input voltage range of 4.5V to 40V and delivers up to 450mA output current with ±8% accuracy over the -40°C to +150°C temperature range. The device features low dropout voltage (max 700mV at 150mA) and integrates fault protection for short circuits, open strings, and over-temperature conditions via a shared FaultB pin. It operates in eTSSOP-8-EP packages.

Feature Summary

• Single-channel high-side linear regulation with external resistor programming
• Integrated thermal shunt resistor capability for optimized power dissipation
• Supports PWM dimming and power supply modulation control
• Active-low open-drain fault reporting for shorts, opens, and over-temperature

Applications

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

Procurement Notes

Verify package type compatibility, as datasheets indicate both SOP-8-EP and TSSOP-14-EP variants exist within the IS32LT3140 family. Confirm AEC-Q100 qualification status for specific automotive reliability requirements. Check for recent Product Change Notifications regarding manufacturing site or material changes. Ensure design accounts for the exposed pad thermal connection requirements specified in the selected package drawing.

Selection Notes

Select this component for single-channel high-side linear drive applications requiring robust fault detection and thermal management. The integrated thermal shunt feature distinguishes it from standard linear drivers by allowing external resistance to manage heat dissipation effectively. Consider the low headroom voltage requirement when designing for high-current scenarios near the maximum operating temperature limits.

Part Context

This part belongs to the IS32LT3140 series of automotive-grade linear LED drivers designed for Lumissil's Intelligent Analog portfolio. It complements other multi-channel solutions like the IS32LT315X family by offering a simplified, cost-effective option for single-string applications where high-side configuration and detailed fault diagnostics are critical for system safety.

Replacement Considerations

The IS32LT3140A-ZLA3-TR is a documented variant within the same series. Verify if the specific suffix change implies differences in package type or minor electrical tolerances before substitution.