IS31LT3173-GRLS4-TR

Overview

The IS31LT3173-GRLS4-TR is a single-output linear LED driver IC manufactured by Lumissil Microsystems. It supports PWM dimming and delivers a constant output current of 200mA per channel. The device operates with a supply voltage range from 5V to 42V and features an internal switch. It is housed in an 8-SOP-EP package with a thermal pad, designed for surface mount installation. The component functions within a temperature range of -40°C to 125°C TA.

Feature Summary

• Integrates a single-channel linear current source with built-in power MOSFET
• Supports high-resolution PWM dimming control via dedicated pin
• Features adjustable current setting using a single external resistor
• Includes thermal shutdown protection for reliable operation

Applications

• General commercial lighting fixtures
• Residential LED bulb applications
• Automotive interior lighting systems

Procurement Notes

Verify the specific suffix GRLS4-TR against the official datasheet to confirm the tape and reel packaging configuration. Confirm RoHS3 compliance status as required by project specifications. Check for End-of-Life (EOL) notifications or last-time buy dates, as availability may be limited. Ensure the 8-SOP-EP footprint matches the PCB design guidelines provided in the manufacturer's documentation.

Selection Notes

Select this component for designs requiring a simple, cost-effective linear solution for low-to-medium power LEDs. It is suitable where heat dissipation allows for linear regulation rather than switching topologies. Verify that the input voltage headroom accommodates the LED forward voltage drop plus the regulator dropout voltage. Ensure the thermal performance of the 8-SOP-EP package meets the system's junction temperature requirements under maximum load conditions.

Part Context

This part belongs to the IS31LT31xx series of linear LED drivers from Lumissil Microsystems. The series focuses on monolithic solutions integrating power switches to simplify design. Similar parts include the IS31LT3172, which shares the same electrical characteristics but may differ in packaging or ordering suffixes. These devices are positioned for general illumination markets requiring high reliability and minimal external components.

Replacement Considerations

The IS31LT3172-GRLS4-TR is a functional equivalent within the same family, offering identical electrical performance. Verify pinout compatibility and thermal pad connectivity when substituting. No other direct cross-references are confirmed in public documentation.