IS31LT3953-GRLS4-TR

Overview

The IS31LT3953-GRLS4-TR is a step-down (buck) LED driver IC designed for lighting applications. It provides a regulated DC-DC solution with PWM dimming capability. The device supports an output current of 4.5A and operates within an input voltage range of 5V to 75V. It features integrated MOSFET technology and is housed in an 8-SOP-EP package. The component supports analog and PWM dimming methods, with a working frequency range of 100 kHz to 1 MHz. It is rated for operation between -40°C and +125°C, with a maximum power dissipation of 2.5W.

Feature Summary

• Integrated monolithic power MOSFET for compact design
• Supports both analog and PWM dimming control
• Regulated DC-DC buck topology for stable LED current

Applications

• General lighting systems
• Architecture lighting
• Motorcycle lighting

Procurement Notes

Verify the specific suffix GRLS4 against official Lumissil documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints for the 8-SOP-EP form factor. Confirm that the 4.5A output rating aligns with the target LED load requirements and thermal management strategy for the intended application environment.

Selection Notes

Select this component for applications requiring a single-channel buck converter with high current capacity. The integrated MOSFET simplifies the bill of materials compared to controller-based solutions. Consider the wide input voltage range when designing power supplies for automotive or industrial environments where voltage transients are common.

Part Context

This part belongs to the Lumissil HBLED Drivers portfolio, which addresses general lighting applications through monolithic and controller-based solutions. The series offers flexibility in design with built-in protections for extended-life operation, targeting commercial, residential, and automotive markets.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.