LM3503SQX-44/NOPB

LED Driver IC Overview

The LM3503SQX-44/NOPB is a dual-output constant current LED driver from Texas Instruments, designed for high-efficiency boost applications. It features an internal switch capable of delivering up to 750mA per channel and supports output voltages up to 44V. The device operates on a supply voltage range of 2.5V to 5.5V with a switching frequency of 1MHz. It integrates both analog and PWM dimming capabilities for brightness control. Packaged in a compact 16-WQFN (4x4mm) footprint, it functions as a DC-DC regulator suitable for backlighting systems within an operating temperature range of -40°C to 85°C.

LED Driver IC Feature Summary

• Dual-output architecture providing independent constant current regulation for two LED channels.
• Integrated analog and pulse-width modulation (PWM) dimming interfaces for precise brightness adjustment.
• High-efficiency step-up (boost) topology with an internal power switch rated for 750mA output current.

LED Driver IC Applications

• Backlight drivers for mobile devices and portable electronics
• White LED illumination circuits requiring boost conversion
• Compact lighting modules utilizing surface-mount packaging

LED Driver IC Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free composition and RoHS compliance when sourcing. Confirm package marking and datasheet revision against the manufacturer's official documentation to ensure compatibility with design specifications. Cross-reference part numbers carefully as variants may exist with different electrical characteristics or pin configurations.

LED Driver IC Selection Notes

Select this component when designing circuits requiring dual-channel LED drive with integrated boost functionality. Ensure the input voltage range aligns with the 2.5V to 5.5V specification. Consider thermal management requirements due to the internal switch operation and verify that the 16-WQFN package fits the available PCB real estate constraints.

LED Driver IC Part Context

This device belongs to the LM3503 series of LED drivers, which are optimized for portable applications. It shares functional similarities with other TI boost converters but is specifically tuned for dual-channel LED loads. The SQX variant denotes the specific tape-and-reel packaging configuration for automated assembly processes.

LED Driver IC Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Verify compatibility with existing designs by comparing electrical parameters such as output current, voltage limits, and package dimensions before substitution.