LT3575EFE#PBF

Overview

The LT3575EFE#PBF is a monolithic switching regulator designed for isolated flyback converter applications. It integrates a high-voltage NPN transistor and features a wide input voltage range of 10V to 28V. The device provides an adjustable output voltage, typically configured for 5V in demonstration circuits like the DC1643A. It supports output currents up to 2A with an integrated 2.5A switch current capability and 60V breakdown rating. Operating frequencies are programmable, allowing optimization for efficiency and component size.

Feature Summary

• Integrated high-voltage NPN transistor for simplified isolated power supply designs
• Programmable switching frequency for flexible magnetics selection
• Supports flyback topology with internal current limiting
• Wide input voltage range suitable for various DC sources

Applications

• Isolated DC-DC converters for industrial equipment
• Power supplies for communication systems
• Battery-powered devices requiring isolation
• General-purpose isolated power modules

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence when ordering. Confirm package type TSSOP-20 availability through authorized distributors. Check for recent product change notifications regarding pinout or electrical specifications before finalizing design-in. Ensure supplier documentation matches the exact part number to avoid counterfeit components.

Selection Notes

Select this component for applications requiring a compact, integrated solution for isolated flyback topologies. Consider the 60V transistor rating and 2.5A switch current limit when designing transformer parameters. Evaluate thermal performance requirements based on expected load conditions and ambient temperature. Compare against non-integrated solutions if higher output voltages or currents are needed beyond the device's capabilities.

Part Context

This part belongs to Analog Devices' line of monolithic switching regulators. It is often evaluated using demonstration boards such as the DC1643A, which showcases its performance in a 5V output configuration from a 10V to 28V input. The device simplifies design by integrating the power switch and control logic into a single package.

Replacement Considerations

Direct replacements may include other Analog Devices flyback controllers with similar voltage and current ratings. Verify compatibility with existing transformer designs and control loop compensation. Cross-reference datasheets for pin-to-pin compatibility if substituting within the same manufacturer family.