LM3503ITL-35/NOPB

LED Driver IC Overview

The LM3503ITL-35/NOPB is a dual-output LED driver IC from Texas Instruments designed for backlight applications. It integrates a step-up (boost) DC-DC regulator capable of driving two independent constant current channels. The device supports analog brightness control and features a switching frequency optimized for efficiency. Key electrical parameters include a maximum output current of 750 mA per channel, an input voltage range typically spanning 2.5 V to 5.5 V, and operation within a temperature range of -40°C to +85°C. The component is housed in a compact 10-TµSMD package measuring 1.9x2.07 mm.

LED Driver IC Feature Summary

• Dual-channel constant current regulation for independent LED string control
• Integrated boost DC-DC converter topology for efficient voltage step-up
• Analog dimming capability for precise brightness adjustment
• Compact surface-mount packaging suitable for space-constrained designs

LED Driver IC Applications

• LCD panel backlighting systems
• Mobile device display illumination
• Portable electronic equipment lighting
• Embedded system indicator arrays

LED Driver IC Procurement Notes

Verify the specific suffix 'ITL-35' against your schematic requirements, as it denotes the specific tape-and-reel packaging and temperature grade variant. Confirm that the 10-TµSMD footprint matches your PCB layout constraints. Ensure the input supply voltage remains within the specified operational limits to maintain stable constant current regulation across both channels. Cross-reference the datasheet revision date to ensure compatibility with latest design guidelines.

LED Driver IC Selection Notes

Select this component when a dual-channel solution is required for uniform backlighting without external discrete drivers. The integrated boost topology eliminates the need for additional inductors or complex circuitry associated with separate regulators. Consider the thermal performance of the small SMD package under high load conditions. Verify that the analog dimming interface aligns with the host controller's output capabilities for smooth intensity transitions.

LED Driver IC Part Context

This part belongs to the LM3503 family of LED drivers, which are specialized for low-power, high-efficiency lighting applications. The series is characterized by its ability to drive multiple LEDs from a single low-voltage source. The NOPB suffix indicates a lead-free, halogen-free product compliant with environmental standards. It serves as a direct replacement for previous versions within the same functional family, maintaining pin-to-pin compatibility where applicable.

LED Driver IC Replacement Considerations

The LM3503SQ-16/NOPB is a related variant within the same family but utilizes a different LLP-16 package and may have distinct pinout or thermal characteristics. Direct substitution requires careful verification of the physical footprint and electrical parameter alignment. Do not assume interchangeability with other Texas Instruments LED drivers lacking the dual-boost architecture.