LM3503ITL-25/NOPB

LED Driver IC Overview

The LM3503ITL-25/NOPB is a dual-display constant current LED driver with analog brightness control, manufactured by Texas Instruments. It utilizes a boost topology to drive two independent LED channels from a single input source. The device operates within an input voltage range of 2.5 V to 5.5 V and supports an output current of up to 400 mA per channel. It features a switching frequency of 1 MHz and is housed in a compact 10-DSBGA package. The component is designed for operation across a temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-channel constant current regulation for independent LED control
• Analog brightness control interface for dimming adjustment
• Integrated boost converter topology for efficient power management
• Compact surface-mount packaging suitable for space-constrained designs

LED Driver IC Applications

• Mobile phone display backlighting systems
• Handheld electronic device illumination
• Portable consumer electronics LED drivers
• Smartphone camera flash circuits

LED Driver IC Procurement Notes

Verify the specific suffix ITL-25 against the target bill of materials, as it denotes a particular tape-and-reel packaging configuration distinct from other variants like SQ-16. Confirm that the obsolete status does not impact long-term supply chain requirements for the intended production volume. Ensure compatibility with existing PCB footprints and reflow profiles specified for the DSBGA package type.

LED Driver IC Selection Notes

Select this component when dual-channel LED driving with analog dimming is required within a low-voltage system. The 1 MHz switching frequency allows for smaller external passive components compared to lower-frequency alternatives. Consider the 400 mA output capability relative to the total LED string current requirements. Evaluate the thermal performance within the DSBGA package if high ambient temperatures are expected in the final application environment.

LED Driver IC Part Context

The LM3503 series represents Texas Instruments' solution for multi-channel LED applications in portable devices. This specific model integrates power switches and control logic into a small footprint, reducing board space compared to discrete solutions. It belongs to a family of drivers optimized for mobile phones and handhelds where efficiency and size are critical constraints for battery-powered operations.

LED Driver IC Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.