LT3748EMS#TRPBF

Overview

The LT3748EMS#TRPBF is a switching regulator controller designed for isolated flyback topologies, capable of high power delivery. It operates with an input voltage range of 5V to 100V and features an operating supply current of 1.3mA. The device utilizes boundary mode operation to optimize magnetic solution size while maintaining load regulation without requiring an opto-isolator or third transformer winding. It drives an external low-side N-channel MOSFET from an internally regulated 7V supply. The component is housed in a 16-lead MSOP package.

Feature Summary

• Eliminates the need for opto-isolators and auxiliary windings by sensing output voltage directly from the primary-side flyback waveform
• Operates in boundary mode to minimize magnetic component size while preserving load regulation performance
• Drives external low-side N-channel power MOSFETs using an internal 7V regulated supply
• Supports wide input voltage ranges up to 100V for diverse DC/DC conversion applications

Applications

• Isolated power supplies for aerospace and defense systems
• Automotive electronic control units and power distribution
• Industrial instrumentation and measurement equipment
• Power over Ethernet (PoE) and VoIP communication devices

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with required thermal management solutions for the MSOP-16 footprint. Cross-reference datasheet revisions to validate electrical characteristics against current design requirements. Confirm availability through authorized distributors to guarantee component authenticity and traceability.

Selection Notes

Select this controller when designing isolated flyback converters that require simplified transformer structures and reduced bill of materials. It is suitable for applications demanding high input voltages up to 100V without sacrificing efficiency. Consider the boundary mode operation benefits for cost-sensitive magnetic designs. Evaluate the gate drive capabilities against the selected external MOSFET specifications to ensure adequate switching performance.

Part Context

The LT3748 series represents a family of high-voltage isolated flyback controllers manufactured by Analog Devices. These components are engineered to replace traditional opto-coupler based feedback loops, offering improved reliability and smaller form factors. The EMS variant specifically denotes the commercial temperature grade and tube packaging configuration within the broader product line.

Replacement Considerations

LT3748IMS#TRPBF: Identical functional specifications with industrial temperature grade and tape-and-reel packaging.