IS32LT3958A-ZLA3-TR

Overview

The IS32LT3958A-ZLA3-TR is a high-voltage LED lighting controller manufactured by Lumissil Microsystems. It operates with a supply voltage range of 5V to 70V and supports switching frequencies between 100kHz and 1MHz. The device features SEPIC, buck, and boost topologies for versatile power conversion. It includes an internal PWM generator and supports both analog and PWM dimming methods. Designed for automotive-grade applications, it functions within a temperature range of -40°C to 150°C. The component is housed in a 20-eTSSOP package with exposed pad.

Feature Summary

• Integrates internal PWM generator for precise light control without external timing components
• Supports multiple converter topologies including SEPIC, buck, and boost for flexible input/output configurations
• Provides fault protection mechanisms to ensure system reliability under abnormal conditions
• Automotive-grade qualification ensures robust performance in demanding thermal environments

Applications

• High voltage LED lighting systems
• Automotive exterior and interior illumination
• Commercial general lighting fixtures
• Residential LED driver designs

Procurement Notes

Verify the manufacturer designation as Lumissil Microsystems or Integrated Silicon Solution Inc (ISSI) on official datasheets, as corporate branding has evolved. Confirm the specific suffix ZLA3 corresponds to the 20-eTSSOP package and tape/reel packaging configuration. Ensure compatibility with automotive grade requirements if deploying in vehicle applications. Cross-reference the part number against current distributor catalogs to confirm availability status and lead times prior to procurement planning.

Selection Notes

Select this controller when designing systems requiring high input voltage support up to 70V and multi-topology flexibility. It is suitable for applications needing integrated fault protection and dual-mode dimming capabilities. Consider the 20-pin eTSSOP package constraints for PCB layout. Verify that the required switching frequency range of 100kHz to 1MHz aligns with external component selection. Ensure the design accommodates the specified operating temperature range for the target environment.

Part Context

This component belongs to the IS32LT3958 family of high-voltage LED drivers from Lumissil Microsystems. The family addresses general lighting and automotive markets with monolithic and controller-based solutions. Similar parts in the portfolio include the IS32LT3954 series for lower voltage buck applications. These devices share common design philosophies focusing on extended life operation and built-in protections for commercial and residential use cases.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Lumissil Microsystems directly for qualified alternatives or pin-compatible upgrades. Verify electrical parameters and package dimensions before substituting any generic equivalents.