LM3551SD

LED Driver IC Overview

The LM3551SD is a step-up DC-DC regulator designed for camera flash applications, featuring a switching frequency of 1.25MHz and an output current capability of 1A. It functions as a white LED driver with integrated flash timeout protection. The device operates within an input voltage range of 2.5V to 5.5V and supports a fixed output configuration. It is housed in a WSON-14 (4x4) package and is rated for operation between -40°C and 85°C.

LED Driver IC Feature Summary

• Integrated flash timeout protection mechanism
• Step-up DC-DC topology for white LED driving
• High-frequency switching operation at 1.25MHz

LED Driver IC Applications

• Camera flash systems
• Portable electronic devices requiring white LED illumination
• Mobile phone flash circuits

LED Driver IC Procurement Notes

Verify component status carefully as the LM3551SD is listed as obsolete and no longer manufactured by Texas Instruments. Check for available substitutes or parametric equivalents if current production is required. Confirm package details and operating temperature ranges against specific design requirements before finalizing procurement plans.

LED Driver IC Selection Notes

Select this component for applications requiring a dedicated 1A white LED driver with built-in safety features like flash timeout protection. Ensure the design accommodates the 1.25MHz switching frequency and the specific WSON-14 package footprint. Consider the obsolete status when planning long-term supply chain stability.

LED Driver IC Part Context

The LM3551SD belongs to the family of power management ICs focused on LED driving solutions. It was originally developed by National Semiconductor and later acquired by Texas Instruments. The device serves as a specialized solution for portable electronics needing reliable flash lighting capabilities with integrated protection features.

LED Driver IC Replacement Considerations

Available substitutes include parametric equivalents such as the LM3551SD/NOPB. Other potential replacements from different manufacturers include MP3204, NCP5050, SD42509, and SD42511, though functional compatibility should be verified.