4.5V to 60V Input, High-Efficiency, Iso-Buck DC-DC Converter

Reduces External Components and Cost for DC-DC Isolation

Please check latest availability status for a specific part variant.


The Rainier series of isolated DC-DC products enable small, efficient solutions with a lower BOM cost. The MAX17686 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 5W. The device operates over a wide 4.5V to 60V input and uses primary-side feedback to regulate the output voltage.

The MAX17686 uses peak-current-mode control. The lowresistance, on-chip MOSFETs ensure high efficiency at full load while simplifying the PCB layout.

The device generates a well regulated primary side voltage which is then scaled by a suitable transformer turns ratio to derive isolated secondary output rails. The MAX17686 features robust overcurrent protection on both the primary and secondary side.

The MAX17686 is available in a compact 10-pin (3mm x 2mm) TDFN package. Simulation model and design automation are available in EE-Sim.

MAX17686: Typical Application Circuit MAX17686: Typical Application Circuit Enlarge+

Key Features

  • 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


  • Floating Power Supply Generation
  • Isolated Fieldbus Interfaces
  • Isolated Power Supplies in Medical Equipment
  • PLC I/O Modules
  • Smart Meters

See parametric specs for Step-Down/Up Switching Regulators (30)

Part NumberVIN
VOUT1 Tolerance
Output Adjust. MethodSwitch TypeSynchronous SwitchingPower Good SignalICC
DC-DC OutputsAlternate TopologyOper. Freq.
Design ToolsPackage/PinsOper. Temp.
minmaxminmaxmaxSee Notes
MAX17686 4.5600.9601.7ResistorInternalYesYes1.951
-40 to +125$1.63 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX17686EVKITA: Evaluation Kit for the MAX17686 for Isolated +24V Output Configuration

Tools & Models

  • EE-Sim: Design & Simulate MAX17686
  • Request Reliability Report for: MAX17686 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Related Resources

    Type ID Title
    Evaluation Board10174MAX17686EVKITA Evaluation Kit for the MAX17686 for Isolated +24V Output Configuration