LT8301JS5#TRMPBF

Overview

The LT8301JS5#TRMPBF is a micropower isolated flyback converter from Analog Devices, housed in a TSOT-23-5 package. It accepts an input voltage range of 2.7V to 42V and integrates a 65V, 1.2A DMOS power switch. The device operates with a quiescent current of 100µA in sleep mode and 350µA in active mode. It utilizes boundary mode operation for heavy loads and low-ripple Burst Mode operation at light loads, achieving minimum load currents below 0.5% of full output. The component is AEC-Q100 qualified for automotive applications.

Feature Summary

• Eliminates the need for opto-isolators or transformer third windings by sampling the isolated output voltage directly from the primary-side flyback waveform.
• Integrates internal compensation and soft-start mechanisms to minimize external component count while maintaining stable regulation.
• Supports output voltage programming via a single external resistor without requiring additional feedback circuitry.

Applications

• Isolated telecom, automotive, industrial, and medical power supplies
• Isolated auxiliary and housekeeping power supplies

Procurement Notes

Verify the specific suffix JS5 against official documentation to confirm temperature grade and packaging specifications. Ensure compatibility with the TSOT-23-5 footprint during PCB layout. Confirm AEC-Q100 qualification status if the application requires automotive-grade reliability standards before finalizing procurement decisions.

Selection Notes

Select this component when designing isolated converters that require high efficiency at light loads and minimal magnetic solution size. The integrated 1.2A switch and 42V input range suit applications needing compact form factors. Verify that the single-resistor voltage setting meets the required output tolerance without additional trimming requirements.

Part Context

This part belongs to the LT8301 series of micropower isolated flyback converters. It shares core architectural features with other variants in the family but differs in thermal performance and operating temperature ranges defined by the specific suffix codes. The TSOT-23-5 package allows for space-constrained designs compared to larger regulator packages.

Replacement Considerations

Consult official substitution guides for verified alternatives within the LT8301 family. Cross-reference pinouts and electrical characteristics carefully, as suffix variations may indicate differences in temperature ratings rather than functional changes.

FAQ

How does the LT8301 achieve regulation without an opto-isolator?

It samples the isolated output voltage directly from the primary-side flyback waveform, removing the requirement for a third winding or opto-isolator.

What is the typical minimum load current capability?

The device maintains high efficiency at light loads with a minimum load current typically below 0.5% of the full output.