ADI LT3573IMSE#TRPBF Isolated Flyback Converter MSOP-16

Description

The Analog Devices LT3573 is a monolithic isolated flyback DC/DC converter. It provides isolated power solutions without an optocoupler or a third transformer winding. The device is housed in a 16-lead MSOP package. It integrates a 1.25 A, 60 V NPN power switch and all necessary control circuitry. This simplifies the design of isolated power supplies for industrial, automotive, medical, and instrumentation applications.

The LT3573 operates from an input voltage range of 3 V to 40 V. It delivers up to 7 W of output power with no external switching devices required. The device senses the isolated output voltage directly from the primary-side flyback waveform. This eliminates traditional feedback components, reducing cost, component count, and board space. It uses boundary mode operation, enabling smaller magnetic components and improved load regulation.

Features include programmable soft-start and an adjustable power switch current limit. It has an internal bias supply via the BIAS pin. The output voltage is set accurately using two external resistors. The LT3573 supports switching frequencies up to 1 MHz, allowing for compact transformer designs. Typical applications include isolated 5 V supplies for CAN bus interfaces, RS-485 transceivers, and gate drivers.

Part number is LT3573IMSE#TRPBF.