LT8303ES5#TRPBF

Overview

The LT8303ES5#TRPBF is a micropower high voltage isolated flyback converter manufactured by Analog Devices Inc. It operates with an input voltage range of 5.5 V to 100 V and delivers up to 5 W of output power. The device integrates a 450 mA, 150 V DMOS power switch within a 5-lead TSOT-23 package. Key electrical specifications include a typical quiescent current of 70 μA in shutdown mode and 280 μA in active mode. Output voltage regulation is achieved without a third transformer winding or opto-isolator by sampling the primary-side flyback waveform.

Feature Summary

• Eliminates the need for a third transformer winding or opto-isolator by regulating via primary-side flyback waveform sampling
• Integrates a 450 mA, 150 V DMOS power switch with internal compensation and soft-start capabilities
• Maintains high efficiency at light loads through low ripple burst mode operation while minimizing output voltage ripple

Applications

• Telecommunications power supplies
• Data communication power systems
• Automotive power distribution
• Industrial power control units
• Medical equipment auxiliary power

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm the specific ES5 suffix indicates the designated temperature grade and performance bin. Request original manufacturer documentation to validate lot traceability and RoHS compliance status prior to integration into production designs.

Selection Notes

Select this component when designing isolated DC-DC converters requiring minimal external component count and high voltage isolation. The primary-side regulation feature simplifies transformer design by removing the requirement for secondary feedback windings. Ensure the application demands fit within the 5 W power limit and 100 V maximum input voltage constraints.

Part Context

This part belongs to the LT8303 family of no-opto isolated flyback regulators. It shares architectural similarities with the LT8300 and LT8301 series but is optimized for higher input voltages up to 100 V. The TSOT-23-5 package provides a compact footprint suitable for space-constrained portable and industrial applications requiring galvanic isolation.

Replacement Considerations

LT8303IS5#TRPBF

FAQ

How does the LT8303 achieve regulation without an opto-isolator?

It samples the isolated output voltage directly from the primary-side flyback waveform during the switch off-time, eliminating the need for a secondary feedback path.

What is the maximum output power capability of this device?

The LT8303 supports isolated output power up to 5 W.