LM3503SQX-16/NOPB

LED Driver IC Overview

The LM3503SQX-16/NOPB is a dual-output constant current LED driver IC from Texas Instruments, designed for backlight applications. It utilizes a boost topology with an internal switch capable of delivering up to 400mA per channel. The device operates within a supply voltage range of 2.5V to 5.5V and features a switching frequency of 1MHz. It supports both analog and PWM dimming methods. The component is housed in a 16-WQFN (4x4) package and functions reliably across a temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-channel constant current output capability
• Integrated boost converter with internal power switch
• Supports analog and PWM dimming control interfaces

LED Driver IC Applications

• LCD backlight driving
• Portable electronic display illumination
• Mobile device lighting systems

LED Driver IC Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout and electrical characteristics. Ensure compatibility with existing PCB footprints and thermal management requirements. Confirm availability status as distribution channels may vary. Cross-reference datasheet revisions to ensure design integrity.

LED Driver IC Selection Notes

Select this component for designs requiring dual independent LED channels in a compact form factor. Consider the 1MHz switching frequency for smaller external passive components. Evaluate input voltage constraints against the 2.5V minimum requirement. Assess thermal performance within the specified operating temperature range.

LED Driver IC Part Context

This part belongs to the LM3503 series of LED drivers. It shares functional similarities with other models in the family but differs in packaging and specific electrical ratings. The SQX variant indicates a specific reel-based packaging configuration suitable for automated surface mount assembly processes.

LED Driver IC Replacement Considerations

Consult official Texas Instruments substitution guides for verified alternatives. Direct replacements must match the 16-WQFN footprint and dual-channel boost architecture. Verify that any substitute maintains equivalent dimming control capabilities and current regulation accuracy.