LM3503SQ-44/NOPB

LED Driver IC Overview

The LM3503SQ-44/NOPB is a dual-display constant current LED driver manufactured by Texas Instruments. It features an integrated boost DC-DC converter capable of delivering up to 750mA switch current per channel with a maximum output voltage of 44V. The device operates on a supply voltage range of 2.5V to 5.5V and supports both analog and PWM dimming methods. Designed for high efficiency, it functions at a switching frequency of 1MHz. The component is housed in a 16-WQFN (4x4 mm) package and is rated for an operating temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-channel constant current regulation for independent LED control
• Integrated boost topology eliminates external inductor requirements for step-up applications
• Supports simultaneous analog and pulse-width modulation (PWM) brightness control

LED Driver IC Applications

• Backlight drivers for mobile devices
• High-brightness LED illumination systems
• Portable electronic display modules

LED Driver IC Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free packaging compliant with RoHS standards. Confirm the '-44' designation corresponds to the 44V output capability variant. Check manufacturer status as this part may be obsolete; validate availability through authorized distributors or approved substitute series before finalizing procurement plans.

LED Driver IC Selection Notes

Select this component when designing dual-zone LED backlighting requiring independent current regulation. Ensure the input power source stays within the 2.5V to 5.5V range. Verify that the thermal performance of the 16-WQFN package meets the system's heat dissipation requirements under continuous operation at maximum load conditions.

LED Driver IC Part Context

This device belongs to the LM3503 family of LED drivers from Texas Instruments. It shares functional similarities with variants like the LM3503SQ-16/NOPB but differs in output voltage specifications. The family is designed for portable electronics, offering compact solutions for driving multiple LED strings efficiently.

LED Driver IC Replacement Considerations

Public records indicate the LM3503SQ-44/NOPB is obsolete. Review Texas Instruments documentation for alternative parts within the LM3503 series or newer generations that offer compatible pinouts and electrical characteristics.