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

Reduce external components, solution size and cost for DC-DC isolation

Please check latest availability status for a specific part variant.


The MAX17682 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 10W. The device operates over a wide 4.5V to 42V input voltage range and uses primary-side feedback to regulate the output voltage. It delivers primary peak current up to 3.7A and regulates primary output voltage to within ±1.2% over -40°C to +125°C.

The device features peak-current-mode control with pulse-width modulation (PWM) scheme. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired inputvoltage level. An open-drain, active-low RESETB pin provides a delayed power-good signal to the system upon achieving successful regulation of the primary output voltage.

The device operates over the -40°C to +125°C industrial temperature range and is available in a compact 20-pin (4mm x 4mm) TQFN package. Simulation models are available.
MAX17682: Typical Application Circuit MAX17682: Typical Application Circuit Enlarge+

Key Features

  • 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


  • Communication Hub in Smart Meters
  • Floating Power Supply Generation
  • Industrial Process Control
  • Isolated Power Supplies in Medical Equipment
Part NumberApplication (VIN)VIN
TopologySwitch TypeFeedbackFreq.
Duty Cycle
Design ToolsOper. Temp.
minmaxmaxmaxmaxSee Notes
Base Station (24V)
Industrial (24V)
4.542FlybackInternalPrimary Side50097.51.82.8EE-Sim-40 to +125
$1.63 @1k
See All Isolated Power Supplies (25)
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.

MAX17682EVKIT: Evaluation Kit for the MAX17682
MAX17682EVKITB: Evaluation Kit for the MAX17682 for Isolated +24V Output Configuration
MAX17682EVKITD: Evaluation Kit for the MAX17682 for Isolated ±15V Dual-Output Configuration
MAX17682EVKITC: Evaluation Kit for the MAX17682 Three-Phase Inverter Gate Drive Power Supply

Quality and Environmental Data

Request Reliability Report for: MAX17682 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • EE-Sim: Design & Simulate MAX17682
  • MAX17682 SIMPLIS Schematic
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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.

    Quality Management System >
    Environmental Management System >


    Related Resources

    Type ID Title
    Evaluation Board9774MAX17682EVKITD Evaluation Kit for the MAX17682 for Isolated ±15V Dual-Output Configuration
    Evaluation Board9637MAX17682EVKITB Evaluation Kit for the MAX17682 for Isolated +24V Output Configuration
    Evaluation Board9326MAX17682EVKIT Evaluation Kit for the MAX17682
    Evaluation Board10052MAX17682EVKITC Evaluation Kit for the MAX17682 Three-Phase Inverter Gate Drive Power Supply