LM3503SQ-25/NOPB

LED Driver IC Overview

The LM3503SQ-25/NOPB is a dual-display constant current LED driver manufactured by Texas Instruments. It features a boost topology with two independent output channels, each capable of delivering up to 400 mA. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports an operating frequency of 1 MHz. It is housed in a 16-pin LLP package and functions reliably across a temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-channel constant current regulation for independent display backlight control
• Integrated analog brightness control interface for dimming adjustment
• Boost converter topology optimized for driving series-connected white LEDs

LED Driver IC Applications

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

LED Driver IC Procurement Notes

Verify the specific suffix '25' against the official datasheet to confirm the exact electrical characteristics and pinout configuration. Ensure the component matches the required 16-WQFN package dimensions and thermal requirements for your PCB layout. Confirm RoHS compliance status and check for any obsolescence notices from the manufacturer before finalizing procurement plans.

LED Driver IC Selection Notes

Select this component when designing circuits requiring dual independent LED strings for display applications. It is suitable for systems needing precise current regulation and analog dimming capabilities. Consider the 1 MHz switching frequency for EMI management and the 400 mA output limit for LED string sizing. Evaluate the 16-pin QFN footprint for space-constrained designs.

LED Driver IC Part Context

This part belongs to the LM3503 family of LED drivers from Texas Instruments. It is specifically designed for mobile and portable electronics where efficient power management and compact packaging are critical. The device integrates necessary protection features and control logic into a small form factor, distinguishing it from general-purpose boost converters.

LED Driver IC Replacement Considerations

Check for direct substitutes such as the LM3503SQ-16/NOPB or LM3503SQ-44/NOPB if pin compatibility and electrical specifications align. Verify that alternative parts support the same dual-channel architecture and analog dimming requirements. Ensure the replacement maintains the required 16-pin WQFN package for mechanical fit.