LM3503SQ-16

LED Driver IC Overview

The LM3503SQ-16 is a dual-display constant current LED driver manufactured by Texas Instruments. It features an integrated boost DC-DC converter topology with two independent output channels capable of delivering up to 400 mA per channel. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports a switching frequency of 1 MHz. It provides analog and PWM dimming control capabilities for backlight applications. The component is housed in a 16-WQFN (4x4 mm) package with exposed thermal pad, designed for surface-mount assembly.

LED Driver IC Feature Summary

• Dual-output constant current regulation for independent display backlight control
• Integrated high-efficiency boost converter with internal power switch
• Supports both analog and pulse-width modulation (PWM) brightness dimming

LED Driver IC Applications

• Mobile phone LCD backlight systems
• Portable media player displays
• Smartphone camera flash drivers

LED Driver IC Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free/RoHS compliance status as per official datasheets. Confirm package marking and date codes against manufacturer records. Check for obsolescence notices or lifecycle status updates from Texas Instruments before finalizing procurement plans.

LED Driver IC Selection Notes

Select this component when designing dual-channel LED backlights requiring precise constant current regulation. Ensure input voltage ranges between 2.5 V and 5.5 V match the system power rail. Verify that the 16-WQFN thermal pad requirements align with PCB layout capabilities for adequate heat dissipation during operation.

LED Driver IC Part Context

This part belongs to the LM3503 family of LED drivers, specifically optimized for portable electronic devices. It serves as a dedicated solution for driving multiple LEDs in series or parallel configurations within compact form factors, replacing discrete boost regulator and driver combinations.

LED Driver IC Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult Texas Instruments application notes or distributor cross-reference tools for potential alternatives if this specific variant is unavailable.