LM3411AM5-3.3

Overview

The LM3411AM5-3.3 is a precision secondary regulator and driver manufactured by National Semiconductor. It is designed for use in power supply applications requiring accurate voltage regulation on the secondary side of isolated converters. The device integrates control logic to manage synchronous rectification, ensuring efficient power conversion. This specific part number indicates a fixed output voltage configuration.

Feature Summary

• Precision secondary regulation capability
• Integrated driver for synchronous rectification
• Designed for high-efficiency power conversion

Applications

• Secondary side post-regulation in isolated DC-DC converters
• Synchronous rectifier control in flyback or forward topologies
• High-efficiency power supply designs requiring tight voltage regulation

Procurement Notes

Verify the manufacturer origin, as Texas Instruments acquired National Semiconductor. Confirm that the AM5 package designation matches the required SOT-23-3 form factor. Ensure the suffix denotes the correct 3.3V fixed output variant. Cross-reference with current TI datasheets for updated pinouts and electrical characteristics to guarantee compatibility with modern design requirements.

Selection Notes

Select this component when a dedicated secondary-side regulator is needed to improve efficiency in isolated power supplies. The fixed 3.3V output simplifies design compared to adjustable variants. Consider the thermal performance of the AM5 package and ensure the driving circuitry supports the required switching frequencies for optimal synchronous rectification performance.

Part Context

The LM3411 series was originally developed by National Semiconductor before being integrated into Texas Instruments' portfolio following their acquisition. The LM3411AM5-3.3 represents a specific variant within this family, characterized by its small outline transistor package and fixed output voltage setting, serving as a key component in secondary-side regulation architectures.