LM3503SQX-35

LED Driver IC Overview

The LM3503SQX-35 is a dual-display constant current LED driver manufactured by Texas Instruments. It utilizes a boost topology to regulate output currents for two independent channels, supporting up to 750mA switch current and 400mA output current. The device operates within a supply voltage range of 2.5V to 5.5V and features an internal switching frequency of 1MHz. It supports both analog and PWM dimming methods for brightness control. The component is housed in a 16-WQFN (LLP) package with dimensions of 4mm x 4mm, designed for efficient thermal performance in space-constrained applications.

LED Driver IC Feature Summary

• Dual-channel constant current regulation for independent display backlighting
• Integrated boost DC-DC converter for high-efficiency LED driving
• Supports combined analog and PWM dimming interfaces for precise brightness adjustment

LED Driver IC Applications

• Mobile phone display backlight systems
• Smartphone LCD backlight drivers
• Portable electronic device illumination

LED Driver IC Procurement Notes

Verify the specific suffix '35' against official Texas Instruments documentation to confirm pinout and electrical characteristics, as variations exist within the LM3503 family. Ensure compatibility with the target PCB footprint for the 16-WQFN package. Confirm RoHS compliance status if required by project specifications, noting that some variants may contain lead while others are NOPB compliant. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

LED Driver IC Selection Notes

Select this component when dual-channel backlighting is required for mobile displays with limited board space. The integrated boost converter simplifies design by eliminating external inductors compared to linear solutions. Consider the 1MHz switching frequency for EMI management and capacitor sizing. Verify that the input voltage range aligns with the system's battery or power rail capabilities. Evaluate thermal requirements based on the LLP package's heat dissipation properties under maximum load conditions.

LED Driver IC Part Context

The LM3503 series represents Texas Instruments' solution for multi-channel LED driving in portable electronics. This specific variant targets dual-display applications common in smartphones and tablets. It belongs to the broader category of analog mixed-signal ICs focused on power management and interface drivers. The SQX designation indicates a specific tape-and-reel packaging configuration suitable for automated surface-mount assembly processes.

LED Driver IC Replacement Considerations

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