LT3573IMSE#PBF

Overview

The LT3573IMSE#PBF is a micropower isolated flyback converter designed for applications requiring high input voltages and galvanic isolation without an optocoupler. It integrates a 150V/260mA switch and operates from input voltages up to 100V. The device utilizes a proprietary no-opto-coupler feedback mechanism, eliminating the need for traditional optoisolators and current transfer ratio tracking components. This architecture simplifies design while maintaining regulation accuracy across line and load variations.

Feature Summary

• Integrates a high-voltage switch capable of handling 150V breakdown
• Eliminates optocouplers through proprietary secondary-side sensing technology
• Supports wide input voltage ranges suitable for industrial power supplies
• Features micropower quiescent current for enhanced efficiency at light loads

Applications

• Isolated DC-DC converters for industrial instrumentation
• Power supplies for sensor interfaces requiring galvanic isolation
• Auxiliary power generation in high-voltage systems
• Battery-operated devices needing efficient isolated conversion

Procurement Notes

Verify the specific suffix and package type against the manufacturer's latest datasheet to ensure compatibility with your design requirements. Confirm availability status as supply conditions may vary by region. Check for RoHS compliance documentation if required for your manufacturing process. Ensure the ordering information matches the exact electrical specifications needed for your application.

Selection Notes

Select this component when designing isolated power stages that require simplified feedback loops and reduced component count. It is suitable for applications where space constraints prevent the use of traditional optocoupler-based designs. Consider the maximum switch current and voltage ratings relative to your transformer design. Evaluate the thermal performance requirements based on the expected load and ambient conditions.

Part Context

The LT3573 belongs to Analog Devices' family of isolated flyback converters that utilize no-opto-coupler technology. This series addresses the reliability and cost issues associated with traditional optoisolators. The IMSE#PBF variant indicates a specific temperature range and lead-free packaging compliant with environmental standards. It serves as a direct replacement for legacy designs using discrete optocouplers and error amplifiers.

Replacement Considerations

LT3573EMSE#PBF is a documented equivalent part number within the same product family.