Isolated Power Supplies

Isolated power supplies transfer power from one circuit to another without a direct connection between the two circuits. Power isolation protects electronic loads and equipment operators from exposure to high voltages. Power isolation also prevents ground loops, which produce parasitic currents that can disrupt the output voltage regulation and can introduce galvanic corrosion of the conducting traces. Isolated power supplies are routinely utilized in industrial, consumer, and telecom applications concerned with the protection of sensitive loads and the long-term reliability of the equipment.

Although an isolated power supply is more complex than a non-isolated power supply, it must still fit into a small space and perform with high efficiency. Our Rainier portfolio of isolated DC-DC and AC-DC converters and controllers deliver smaller solution sizes with smaller BOMs. Our patented technology eliminates the optocoupler from the feedback path, saving 30% of the typical board space required and up to 50% off the BOM. Industry-leading features include:

  • Wide input voltage ranges
  • High-efficiency operation
  • Small packaging
  • No-opto technology
  • Adjustable switching frequencies

Isolated Power Supplies Development Boards

High-Efficiency Power Supply for TVS


Power-supply reference design provides a 5V output and up to 5A of load current for system power of auxiliary functions such as monitoring and control.

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Isolated 24V to 5V, 2W Flyback Power Supply


Industrial power-supply reference design features an efficient flyback topology with 24V input, and a 5V output at 2W of power (0.4A)

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Isolated Power Supplies Design Resources

Design Tools and Software

Technical Documents

Application Notes:



Isolated Power Supplies Featured Products

4.5V to 42V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter


Provides up to 10W isolated power, reduces power dissipation with > 90% peak efficiency and 2.8µA shutdown current.

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4.5V to 42V Input, High-Efficiency, Iso-Buck DC-DC


Provides up to 5W isolated power, reduces power dissipation with > 90% peak efficiency and 0.9µA shutdown current.

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60V, No-Opto Isolated Flyback Controller


Compact, cost-effective, and easy-to-implement isolated DC-DC controller.

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