LM3503SQX-16

LED Driver IC Overview

The LM3503SQX-16 is a dual-output DC-DC boost regulator designed for LED driving applications. It integrates internal switches and supports analog and PWM dimming. The device operates within a supply voltage range of 2.5V to 5.5V, with a switching frequency of 1MHz. Each output channel provides a maximum switch current of 400mA. The component is housed in a 16-WQFN (4x4) package and functions within an operating temperature range of -40°C to +85°C.

LED Driver IC Feature Summary

• Integrates internal power switches for compact design
• Supports both analog and PWM brightness control methods
• Dual-output topology for independent LED channel regulation

LED Driver IC Applications

• LED backlighting systems
• Constant current LED driver circuits
• Portable electronic display illumination

LED Driver IC Procurement Notes

Verify component status as the LM3503SQX-16 is listed as obsolete by Texas Instruments. Confirm availability through authorized distributors or alternative sources such as Rochester Electronics. Ensure that any substitute components meet the original electrical specifications and package dimensions for seamless integration into existing designs.

LED Driver IC Selection Notes

Select this component for applications requiring dual-channel LED drive with integrated switching capability. Consider the 16-WQFN package size for space-constrained layouts. Evaluate the 400mA output current limit against load requirements. Verify compatibility with system supply voltages between 2.5V and 5.5V before implementation.

LED Driver IC Part Context

The LM3503 belongs to Texas Instruments' family of dual-display constant current LED drivers. This specific variant features a 16-pin WQFN package optimized for surface-mount assembly. It is engineered for high-efficiency boost conversion suitable for powering multiple LED strings from low-voltage sources.

LED Driver IC Replacement Considerations

LM3503SQ-16 is listed as a parametric equivalent available from Rochester Electronics. Verify pinout and thermal performance compatibility when substituting.