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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

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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

Product Image
MAX17691B 4.2V–60V No-Opto Isolated Flyback Converter with Integrated FET
Maxim's Rainier family of isolated power devices enable cooler, smaller, and simpler power-suppl...
  • Reduces External Components and Total Cost
    • Eliminates the Optocoupler and Secondary-Side Error Amplifier
    • Up to 20% Space Savings
    • 76V, Low RDS(ON) Integrated nMOSFET
    • Internal Loop Compensation (MAX17691A)
    • Built-In Soft-Start
  • Reduces Power Dissipation
    • > 90% Efficiency
    • Delivers up to 7.5W Output Power
    • Frequency Fold-Back Enables Enhanced Light-Load Efficiency
    • 2.5µA Shutdown Current
  • Supports Key System-Level Design Requirements
    • Frequency Dithering Supports Low-EMI, Spread-Spectrum Operation
    • Switching Frequency Synchronization
    • Compliant with CISPR22 ClassB EMI Requirements
  • Operates Reliably in Adverse Environments
    • Optional Output Voltage Temperature Compensation
    • Hiccup Current-Limit Protection
    • Programmable EN/UVLO Threshold
    • Input Overvoltage (OVI) Protection (MAX17691A)
    • Overtemperature Protection
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range
Product Image
MAX17691A 4.2V–60V No-Opto Isolated Flyback Converter with Integrated FET
Maxim's Rainier family of isolated power devices enable cooler, smaller, and simpler power-suppl...
  • Reduces External Components and Total Cost
    • Eliminates the Optocoupler and Secondary-Side Error Amplifier
    • Up to 20% Space Savings
    • 76V, Low RDS(ON) Integrated nMOSFET
    • Internal Loop Compensation (MAX17691A)
    • Built-In Soft-Start
  • Reduces Power Dissipation
    • > 90% Efficiency
    • Delivers up to 7.5W Output Power
    • Frequency Fold-Back Enables Enhanced Light-Load Efficiency
    • 2.5µA Shutdown Current
  • Supports Key System-Level Design Requirements
    • Frequency Dithering Supports Low-EMI, Spread-Spectrum Operation
    • Switching Frequency Synchronization
    • Compliant with CISPR22 ClassB EMI Requirements
  • Operates Reliably in Adverse Environments
    • Optional Output Voltage Temperature Compensation
    • Hiccup Current-Limit Protection
    • Programmable EN/UVLO Threshold
    • Input Overvoltage (OVI) Protection (MAX17691A)
    • Overtemperature Protection
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range
Product Image
MAX17690 60V, No-Opto Isolated Flyback Controller
The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed ...
  • 4.5V to 60V Input Voltage Range
  • No Optocoupler or Third Winding Required to Derive Feedback Signal Across Isolation Boundary
  • 2A/4A Peak Source/Sink Gate Drive Currents
  • 50kHz to 250kHz Programmable Switching Frequency
  • Input EN/UVLO Feature
  • Input Overvoltage Protection
  • Programmable Soft-Start
  • Hiccup-Mode Short-Circuit Protection
  • Thermal Shutdown Protection
  • -40°C to 125°C Operating Temperature Range
  • Space-Saving, 16-Pin 3 x 3 TQFN Package
Product Image
MAX17687 4.5V to 60V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter
The Rainier series of isolated DC-DC products enable small, efficient solutions with a lower BOM...
  • Eliminates External Components and Reduces Total Cost
    • Synchronous Primary Operation for High Efficiency and Reduced Cost
    • All-Ceramic Capacitors, Ultra-Compact Layout
  • Supports Numerous Isolated DC-DC Applications
    • Wide 4.5V to 60V Input Voltage Range
    • Delivers up to 3.2A Peak Current
    • 100kHz to 500kHz Adjustable Frequency with External Synchronization
    • Available in a 20-Pin, 4mm x 4mm TQFN Package
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • Shutdown Current = 2.8μA (typ)
  • Operates Reliably in Adverse Industrial Environments
    • Hiccup-Mode Current Limit, Sink Current Limit, and Auto-Retry Startup
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start
    • -40°C to +125°C Ambient Operating Temperature Range
    • -40°C to +150°C Junction Temperature Range
Product Image
MAX17686 4.5V to 60V Input, High-Efficiency, Iso-Buck DC-DC Converter
The Rainier series of isolated DC-DC products enable small, efficient solutions with a lower BOM...
  • Reduces External Components and Total Cost
    • No OptoCoupler
    • Synchronous Primary Operation
    • All-Ceramic Capacitors, Compact Layout
  • Supports Numerous Isolated DC-DC Applications
    • Wide 4.5V to 60V Input
    • Delivers Up to 5W Output Power
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • 0.9µA (typ) Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Peak and Sink Current-Limit Protection
    • Robust Secondary-Side Output Overcurrent Protection
    • ±1.7% Feedback Accuracy
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start
    • Overtemperature Protection
    • -40°C to +125°C Operation
Product Image
MAX13253 1A Spread-Spectrum Push-Pull Transformer Driver for Isolated Power Supplies
The MAX13253 is a 1A push-pull transformer driver designed to provide a simple solution for low-...
  • Simple, Flexible Design
    • +3.0V to +5.5V Supply Range
    • Low RON 300mΩ (max) at 4.5V
    • Up to 90% Efficiency
    • Provides Up to 1A to the Transformer
    • Internal or External Clock Source
    • Internal Oscillator Frequency: 250kHz or 600kHz
    • Optional Spread-Spectrum Oscillation
    • -40°C to +125°C Temperature Range
  • Integrated System Protection
    • Fault Detection and Indication
    • Overcurrent Limiting
    • Undervoltage Lockout
    • Thermal Shutdown
  • Saves Space on Board
    • Small 10-Pin TDFN Package (3mm x 3mm)
Product Image
MAX258 500mA Push-Pull Transformer Driver for Isolated Power Supplies
The MAX258 is a 500mA, push-pull transformer driver designed to provide a simple solution for is...
  • Simple, Flexible Design
    • +3.0V to +5.5V Supply Range
    • Low RON 300mΩ (max) at 4.5V
    • Up to 90% Efficiency
    • Provides Up to 500mA to the Transformer
    • 250kHz or 600kHz Internal Oscillator Frequency
    • -40°C to +125°C Temperature Range
  • Integrated System Protection
    • Undervoltage Lockout
    • Thermal Shutdown
  • Saves Space on Board
    • Small 8-Pin TDFN Package (2mm x 3mm)
Product Image
MAX5974A Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers
The MAX5974_ provide control for wide-input-voltage, active-clamped, current-mode PWM, forward c...
  • Peak Current-Mode Control, Active-Clamped Forward PWM Controller
  • Regulation Without Optocoupler (MAX5974A/MAX5974B)
  • Internal 1% Error Amplifier
  • 100kHz to 600kHz Programmable ±8% Switching Frequency, Synchronization Up to 1.2MHz
  • Programmable Frequency Dithering for Low-EMI, Spread-Spectrum Operation
  • Programmable Dead Time, PWM Soft-Start, Current Slope Compensation
  • Programmable Feed-Forward Maximum Duty-Cycle Clamp, 80% Maximum Limit
  • Frequency Foldback for High-Efficiency Light-Load Operation
  • Internal Bootstrap UVLO with Large Hysteresis
  • 100µA (typ) Startup Supply Current
  • Fast Cycle-by-Cycle Peak Current-Limit, 35ns Typical Propagation Delay
  • 115ns Current-Sense Internal Leading-Edge Blanking
  • Output Short-Circuit Protection with Hiccup Mode
  • Reverse Current Limit to Prevent Transformer Saturation Due to Reverse Current
  • Internal 18V Zener Clamp on Supply Input
  • 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP
Product Image
MAX5974B Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers
The MAX5974_ provide control for wide-input-voltage, active-clamped, current-mode PWM, forward c...
  • Peak Current-Mode Control, Active-Clamped Forward PWM Controller
  • Regulation Without Optocoupler (MAX5974A/MAX5974B)
  • Internal 1% Error Amplifier
  • 100kHz to 600kHz Programmable ±8% Switching Frequency, Synchronization Up to 1.2MHz
  • Programmable Frequency Dithering for Low-EMI, Spread-Spectrum Operation
  • Programmable Dead Time, PWM Soft-Start, Current Slope Compensation
  • Programmable Feed-Forward Maximum Duty-Cycle Clamp, 80% Maximum Limit
  • Frequency Foldback for High-Efficiency Light-Load Operation
  • Internal Bootstrap UVLO with Large Hysteresis
  • 100µA (typ) Startup Supply Current
  • Fast Cycle-by-Cycle Peak Current-Limit, 35ns Typical Propagation Delay
  • 115ns Current-Sense Internal Leading-Edge Blanking
  • Output Short-Circuit Protection with Hiccup Mode
  • Reverse Current Limit to Prevent Transformer Saturation Due to Reverse Current
  • Internal 18V Zener Clamp on Supply Input
  • 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP
Product Image
MAX5974C Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers
The MAX5974_ provide control for wide-input-voltage, active-clamped, current-mode PWM, forward c...
  • Peak Current-Mode Control, Active-Clamped Forward PWM Controller
  • Regulation Without Optocoupler (MAX5974A/MAX5974B)
  • Internal 1% Error Amplifier
  • 100kHz to 600kHz Programmable ±8% Switching Frequency, Synchronization Up to 1.2MHz
  • Programmable Frequency Dithering for Low-EMI, Spread-Spectrum Operation
  • Programmable Dead Time, PWM Soft-Start, Current Slope Compensation
  • Programmable Feed-Forward Maximum Duty-Cycle Clamp, 80% Maximum Limit
  • Frequency Foldback for High-Efficiency Light-Load Operation
  • Internal Bootstrap UVLO with Large Hysteresis
  • 100µA (typ) Startup Supply Current
  • Fast Cycle-by-Cycle Peak Current-Limit, 35ns Typical Propagation Delay
  • 115ns Current-Sense Internal Leading-Edge Blanking
  • Output Short-Circuit Protection with Hiccup Mode
  • Reverse Current Limit to Prevent Transformer Saturation Due to Reverse Current
  • Internal 18V Zener Clamp on Supply Input
  • 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP
Product Image
MAX5974D Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers
The MAX5974_ provide control for wide-input-voltage, active-clamped, current-mode PWM, forward c...
  • Peak Current-Mode Control, Active-Clamped Forward PWM Controller
  • Regulation Without Optocoupler (MAX5974A/MAX5974B)
  • Internal 1% Error Amplifier
  • 100kHz to 600kHz Programmable ±8% Switching Frequency, Synchronization Up to 1.2MHz
  • Programmable Frequency Dithering for Low-EMI, Spread-Spectrum Operation
  • Programmable Dead Time, PWM Soft-Start, Current Slope Compensation
  • Programmable Feed-Forward Maximum Duty-Cycle Clamp, 80% Maximum Limit
  • Frequency Foldback for High-Efficiency Light-Load Operation
  • Internal Bootstrap UVLO with Large Hysteresis
  • 100µA (typ) Startup Supply Current
  • Fast Cycle-by-Cycle Peak Current-Limit, 35ns Typical Propagation Delay
  • 115ns Current-Sense Internal Leading-Edge Blanking
  • Output Short-Circuit Protection with Hiccup Mode
  • Reverse Current Limit to Prevent Transformer Saturation Due to Reverse Current
  • Internal 18V Zener Clamp on Supply Input
  • 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP
Product Image
MAX17682 4.5V to 42V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter
The MAX17682 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide is...
  • Eliminates External Components and Reduces Total Cost
    • Synchronous Primary Operation for High Efficiency and Reduced Cost
    • All-Ceramic Capacitors, Ultra-Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 42V Input Voltage Range
    • 0.9V to 92% VIN Primary Output Voltage
    • Delivers up to 3.7A Peak Current
    • 100kHz to 500kHz Adjustable Frequency with External Synchronization
    • Available in a 20-Pin, 4mm x 4mm TQFN Package
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • Shutdown Current = 2.8µA (typ)
  • Operates Reliably in Adverse Industrial Environments
    • Hiccup-Mode Current Limit, Sink Current Limit, and Auto-Retry Startup
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range
    • -40°C to +150°C Junction Temperature Range
Product Image
MAX17681 4.5V to 42V Input, High-Efficiency, Iso-Buck DC-DC Converter
The MAX17681/MAX17681A is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to ...
  • Reduces External Components and Total Cost
    • No OptoCoupler
    • Synchronous Primary Operation
    • All-Ceramic Capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 42V Input
    • 0.9V to 0.96 x VIN Primary Output Voltage
    • Delivers Up to 5W Output Power
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • 0.9µA (typ) Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Peak and Sink Current-Limit Protection
    • ±1.7% Feedback Accuracy
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start
    • Overtemperature Protection
    • -40°C to +125°C Operation
  • Short-Circuit Protection
    • MAX17681A Supports Robust Secondary-Side Short-Circuit Protection
    • MAX17681A Is Recommended for All New Designs
Product Image
MAX17595 Peak-Current-Mode Controllers for Flyback and Boost Regulators
The MAX17595/MAX17596/MAX17597 is a family of peak-current-mode controllers for design of wide i...
  • Programmable Switching Frequency Allows Optimization of the Magnetic and Filter Components, Resulting in Compact, Cost-Effective, Efficient Isolated/Non-Isolated Power Supplies
    • 100kHz to 1MHz Programmable Switching Frequency with Optional Synchronization
    • Peak Current Mode Control Provides Excellent Transient Response
      • Offline (Universal Input AC) and Telecom (36V to 72V) Flyback Controller—MAX17595
      • DC-DC (4.5V to 36V) Flyback Controller—MAX17596
      • Nonsynchronous (4.5V to 36V) Boost PWM Controller—MAX17597
    • 3mm x 3mm TQFN Package
  • Programmable Frequency Dithering Enables Low-EMI Spread-Spectrum Operation
  • Integrated Protection Features Enhance System Reliability
    • Adjustable Current Limit with External Current-Sense Resistor
    • Fast Cycle-By-Cycle Peak Current Limiting
    • Hiccup-Mode Short-Circuit Protection
    • Overtemperature Protection
    • Programmable Soft-Start and Slope Compensation
    • Input Overvoltage Protection
Product Image
MAX17596 Peak-Current-Mode Controllers for Flyback and Boost Regulators
The MAX17595/MAX17596/MAX17597 is a family of peak-current-mode controllers for design of wide i...
  • Programmable Switching Frequency Allows Optimization of the Magnetic and Filter Components, Resulting in Compact, Cost-Effective, Efficient Isolated/Non-Isolated Power Supplies
    • 100kHz to 1MHz Programmable Switching Frequency with Optional Synchronization
    • Peak Current Mode Control Provides Excellent Transient Response
      • Offline (Universal Input AC) and Telecom (36V to 72V) Flyback Controller—MAX17595
      • DC-DC (4.5V to 36V) Flyback Controller—MAX17596
      • Nonsynchronous (4.5V to 36V) Boost PWM Controller—MAX17597
    • 3mm x 3mm TQFN Package
  • Programmable Frequency Dithering Enables Low-EMI Spread-Spectrum Operation
  • Integrated Protection Features Enhance System Reliability
    • Adjustable Current Limit with External Current-Sense Resistor
    • Fast Cycle-By-Cycle Peak Current Limiting
    • Hiccup-Mode Short-Circuit Protection
    • Overtemperature Protection
    • Programmable Soft-Start and Slope Compensation
    • Input Overvoltage Protection

Design Tools and Software

 EE-Sim: Design and Simulate

Featured Reference Designs

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...
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...