LM3503SQ-35/NOPB

LED Driver IC Overview

The LM3503SQ-35/NOPB is a dual-display constant current LED driver manufactured by Texas Instruments. It features an integrated boost converter topology capable of delivering up to 750mA per channel. The device operates within a supply voltage range of 2.5V to 5.5V and supports a switching frequency of 1MHz. It provides both analog and PWM dimming capabilities for brightness control. The component is housed in a 16-WQFN package with an exposed pad, designed for operation across a temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-channel constant current output for independent backlight control
• Integrated high-efficiency boost DC-DC converter
• Supports simultaneous analog and PWM dimming interfaces
• Compact 16-pin WQFN package design

LED Driver IC Applications

• Mobile phone display backlights
• Smartphone LCD backlighting systems
• Portable electronic device illumination
• Camera module flash drivers

LED Driver IC Procurement Notes

Verify the specific suffix '35' against the manufacturer's official documentation to confirm pinout and thermal pad configuration. Confirm end-of-life status as distributors may list obsolete inventory. Ensure compatibility with existing PCB footprint and thermal management requirements before procurement.

LED Driver IC Selection Notes

Select this component when dual-channel LED driving is required for separate display sections. Consider the 1MHz switching frequency for inductor size optimization. Evaluate the 750mA output limit against total LED string current requirements. Verify that the input voltage range matches the system battery profile.

LED Driver IC Part Context

This part belongs to the LM3503 series of LED drivers from Texas Instruments. It is functionally similar to variants like LM3503SQ-16/NOPB but differs in package marking or internal trim settings. The series is designed for portable applications requiring efficient power management for multiple LED strings.

LED Driver IC Replacement Considerations

Public records indicate the LM3503SQ-35/NOPB is obsolete. Potential substitutes include other dual-channel LED drivers from the same family or newer generations from Texas Instruments. Verify electrical parameters and pin compatibility before substitution.