LM3503SQX-25/NOPB

LED Driver IC Overview

The LM3503SQX-25/NOPB is a dual-channel constant current LED driver manufactured by Texas Instruments. It utilizes a boost topology to drive white LEDs, supporting an output voltage of 25V and a switch current of 600mA per channel. The device operates within a supply voltage range of 2.5V to 5.5V at a fixed switching frequency of 1MHz. It features analog and PWM dimming capabilities for brightness control. The component is housed in a 16-pin LLP package and functions reliably across a temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Dual-channel constant current regulation for independent LED string control
• Integrated high-efficiency boost converter with internal power switch
• Supports both analog and pulse-width modulation (PWM) dimming methods
• Fixed 1MHz switching frequency enables compact external component sizing

LED Driver IC Applications

• White LED backlighting for mobile devices
• Portable electronic display illumination systems
• High-brightness LED lighting modules requiring dual-channel drive

LED Driver IC Procurement Notes

Verify the specific suffix 'X-25' indicates the 25V output rating variant distinct from other LM3503 models. Confirm the 'NOPB' designation ensures lead-free compliance and RoHS adherence. Check manufacturer status as this part may be obsolete or discontinued; validate availability through authorized distributors only. Ensure the 16-pin LLP package footprint matches the design layout requirements.

LED Driver IC Selection Notes

Select this component when dual-channel LED driving is required with a maximum output voltage of 25V. The 600mA switch current capability suits medium-power LED strings. Consider the 1MHz frequency for balancing efficiency and EMI against passive component size. Verify input voltage compatibility with the 2.5V to 5.5V operating range. Compare against single-channel alternatives if only one LED string is needed.

LED Driver IC Part Context

This device belongs to the LM3503 series of LED drivers designed for portable applications. It differs from the LM3502 series which typically supports higher output voltages like 35V. The SQX-25 variant specifically targets applications requiring up to 25V headroom. It shares the same 16-pin LLP package form factor as other members in the family but varies in electrical ratings.

LED Driver IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult Texas Instruments for current equivalent recommendations or verify if the LM3503SQ-16/NOPB serves as a lower-voltage alternative depending on circuit requirements.