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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

Featured Technical Documents

Technical Documentation

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Technical Documentation

Technical Documents

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Featured Videos


Power Seminar Module 7: Theory Behind Isolated DC-DC Solutions
18:29 July 18, 2017


Power Seminar Module 9: Practical Design Considerations for an Iso-Buck Converter
9:24 July 18, 2017

Latest Blogs

Power Up Internal Circuits While Simplifying Diagnostics for Signal Monitoring Applications

January 30, 2020

Get isolated power with simplified diagnostics for signal monitoring applications. Read the blog to enhance your analog-to-digital converter applications.

Ask Michael: Swipe Right for the Isolated Gate Driver That’s a Perfect Match for GaN/SiC Switches

December 17, 2019

Learn how isolated gate driver ICs with highest CMTI and 2ns propagation delay skew help minimize dead time and drive up efficiency of designs. Read blog post.

Infomart Creates Tiny Power-over-Ethernet Devices

September 28, 2017

Infomart designs ultra-small, highly integrated power-over-Ethernet devices. Learn how Maxim’s peak-current-mode controllers met their requirements.

Why Iso-Buck Converters Are Better than Flyback Converters

May 31, 2017

Learn why isolation benefits low-voltage power conversion systems, and why iso-buck converters perform better than the classic flyback converter.

Learn Ways to Improve Power Efficiency—Free Seminar

May 31, 2017

Maxim's free Power Seminar Series stops throughout Europe this summer to teach ways to boost efficiency and reduce heat dissipation in power sub-systems.

Featured Products

Design Tools and Software

 EE-Sim: Design and Simulate

Featured Reference Designs

MAXREFDES1253: Miniature 17V, 0.75A No Opto Flyback DC to DC Converter Using the MAX17690

The MAXREFDES1253 illustrates techniques using the No Opto Flyback converter to generate isolate...

MAXREFDES1218: 24V, 3A Average Current, 4A Peak Current Active Clamp Forward DC-DC Converter Using the MAX17599

The MAXREFDES1218 is an active-clamp forward power supply that delivers up to 4A at 24V from a 1...

MAXREFDES1226: Miniature, Low-Profile, 5V/1.5A, Synchronous, No-Opto Flyback DC-DC Converter with 87% Efficiency Using MAX17690 and MAX17606

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-med...

MAXREFDES1085: Miniature 24W DC-DC Flyback Converter Using the MAX17596

The MAXREFDES1085 is a miniature, 24V output, isolated power supply that can deliver up to 1A of...

MAXREFDES41#: Isolated 24V to 12V 40W Power Supply with Planar Transformer

The MAXREFDES41# reference design features a highly efficient, isolated DC-DC converter with an ...

MAXREFDES48#: Isolated 24V to 12V 40W Power Supply with EFD20 Core Transformer

The MAXREFDES48# reference design features a highly efficient, isolated DC-DC converter with an ...

MAXREFDES32#: 2-Channel Analog Input/Analog Output with Flyback DC-DC

MAXREFDES32# subsystem reference design is a high-speed, high-accuracy, 16-bit, 2-channel simult...

MAXREFDES71#: 2-Channel Analog Input/Analog Output with Transformer Driven Power

MAXREFDES71# subsystem reference design is a high-speed, high-accuracy, 16-bit, 2-channel simult...

Carmel (MAXREFDES18#): High Accuracy Analog Current/Voltage Output

The Carmel (MAXREFDES18#) subsystem reference design is an isolated, high-accuracy analog curren...

Corona (MAXREFDES12#): Isolated Industrial Octal Digital Input Translator/Serializer

This document explains how the Corona (MAXREFDES12#) subsystem reference design provides a compa...

Oceanside (MAXREFDES9#): 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply

Oceanside (MAXREFDES9#) industrial reference design is an isolated power supply with a 3.3V to 1...