LM3503SQ-16/NOPB

LED Driver IC Overview

The LM3503SQ-16/NOPB is a dual-output boost DC-DC regulator designed for LED lighting applications. It operates within an input voltage range of 2.5 V to 5.5 V and supports output currents up to 400 mA. The device features a fixed switching frequency of 1 MHz and provides analog and PWM dimming capabilities. It is housed in a 16-pin LLP package (4x4 mm) and functions across a temperature range of -40 °C to +85 °C.

LED Driver IC Feature Summary

• Dual-output constant current regulation for driving multiple LED strings
• Integrated analog and PWM dimming control interfaces
• Fixed high-frequency operation to minimize external component size

LED Driver IC Applications

• Portable device backlighting systems
• General LED illumination modules
• Battery-powered lighting devices

LED Driver IC Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free packaging compliant with RoHS standards. Confirm the 'SQ' package designation matches the required 16-WQFN footprint dimensions. Check manufacturer lifecycle status as distribution data may indicate end-of-life or limited availability. Ensure the selected supplier provides valid traceability documentation for automotive or industrial grade requirements if applicable.

LED Driver IC Selection Notes

Select this component when a compact solution for dual-string LED driving is required from a single-cell lithium battery source. The fixed 1 MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Verify that the load current requirements do not exceed the 400 mA switch limit. Consider thermal dissipation constraints inherent to the small LLP package under high ambient temperatures.

LED Driver IC Part Context

This part belongs to the LM3503 series of LED drivers from Texas Instruments. It is functionally related to other members like the LM3502, though pinouts and specific output configurations may vary. The 'NOPB' suffix distinguishes it from older non-compliant versions, ensuring environmental compliance.

LED Driver IC Replacement Considerations

Direct substitutes include the LM3503SQ-16 without the NOPB suffix if lead content is acceptable. Cross-reference with LM3502 variants only if single-output topology suffices. Verify pin compatibility before swapping with other TI boost regulators.