Analog Devices MAX17681 Product Info

• 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 V_IN 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

The MAX17681/MAX17681A 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 42V input and uses primary-side feedback to regulate the output voltage.

MAX17681/MAX17681A uses peak-current-mode control. The low-resistance, on-chip MOSFETs ensure high efficiency at full load while simplifying the PCB layout.

The MAX17681/MAX17681A devices generate a well regulated primary side voltage which is then scaled by a suitable transformer turns ratio to derive isolated secondary output rails. While both MAX17681 and MAX17681A support primary side overcurrent protection, the MAX17681A is an enhanced design that supports robust secondary-side overcurrent protection as well.

The MAX17681/MAX17681A is available in a compact 10-pin (3mm x 2mm) TDFN package. Simulation models are available.

Applications

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