LM3502SQX-44

LED Driver IC Overview

The LM3502SQX-44 is a dual-output boost DC-DC converter designed for white LED backlight applications. It features an integrated high-efficiency power switch capable of delivering up to 750mA per channel. The device supports PWM dimming control and operates within a supply voltage range of 2.5V to 5.5V. It utilizes a 16-WQFN (4x4mm) package with exposed thermal pad for enhanced heat dissipation. The internal switching frequency is fixed at 1MHz, enabling compact passive component selection. Operating temperature range spans from -40°C to 85°C.

LED Driver IC Feature Summary

• Integrated dual-channel boost topology for independent LED string driving
• Supports precise PWM dimming control for brightness adjustment
• High-efficiency internal power switches reduce external component count
• Compact surface-mount packaging facilitates dense PCB layouts

LED Driver IC Applications

• Mobile phone LCD backlights
• Portable media player displays
• Camera module flash lighting
• Small form-factor electronic devices requiring dual LED strings

LED Driver IC Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and lead-free marking on the package. Check datasheet revisions for any pinout or electrical parameter updates. Ensure storage conditions meet moisture sensitivity level requirements prior to reflow soldering. Validate that the specific suffix matches the required tape-and-reel configuration.

LED Driver IC Selection Notes

Evaluate input voltage compatibility with system power rails to ensure stable operation within the 2.5V to 5.5V range. Assess thermal management needs based on ambient temperature and PCB copper area available for the exposed pad. Compare total inductor size against space constraints given the 1MHz switching frequency. Consider dimming interface requirements to match host controller capabilities. Review output current limits to prevent exceeding the 750mA per channel specification under worst-case load conditions.

LED Driver IC Part Context

This component belongs to Texas Instruments' family of dedicated LED driver ICs optimized for portable electronics. It complements other single-channel and multi-channel drivers by offering dual-output capability in a small footprint. The design targets applications requiring synchronized or independent control of multiple LED strings without complex external circuitry.

LED Driver IC Replacement Considerations

LM3502SQX-44/NOPB serves as the non-Pb version of this obsolete part number.