IS31LT3948-GRLS4-TR

Overview

The IS31LT3948-GRLS4-TR is a PFM step-up DC-DC controller designed for driving white LED arrays in large-size LCD panel backlighting applications. It features PWM dimming capability and operates within an ambient temperature range of -40°C to 125°C. The device is housed in an 8-SOP surface-mount package, providing a compact solution for high-efficiency LED driver designs.

Feature Summary

• Integrated PFM step-up DC-DC converter topology
• Supports PWM dimming control for brightness adjustment
• Designed specifically for white LED array backlighting

Applications

• Large-size LCD panel backlighting
• White LED array driving circuits
• High-efficiency LED power management systems

Procurement Notes

Verify the specific suffix GRLS4-TR against the manufacturer's latest datasheet to confirm pinout compatibility and tape-and-reel specifications. Ensure the ordering documentation matches the exact part number to avoid substitution errors with similar variants in the IS31LT39xx series.

Selection Notes

Select this component when designing boost converters for white LED backlights requiring PFM efficiency and PWM dimming. Confirm that the 8-SOP package fits the PCB layout constraints and that the operating temperature range meets the system's environmental requirements.

Part Context

This part belongs to Lumissil Microsystems' IS31LT39xx series of LED drivers. These controllers are engineered for general lighting and display backlighting, offering integrated power solutions or external MOSFET configurations depending on the specific model variant within the family.

Replacement Considerations

Check for direct substitutes within the IS31LT39xx series, such as the IS31LT3953, ensuring voltage and current ratings align with the original design specifications before implementation.