MAX5991

PRODUCTION

IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2 Powered Devices with Integrated DC-DC Converter

Integrated Powered Devices with Regulator Simplifies Designs

Part Models
4
1ku List Price
Starting From $4.48
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Part Details

  • High Integration Saves Space and BOM Cost
    • Efficient, Integrated DC-DC Converter (with Integrated Switches)
    • Built-In Output-Voltage Monitoring
    • Protects Against Overload, Output Short Circuit, Output Overvoltage, and Overtemperature
    • Integrated TVS Diode Withstands Cable Discharge Event (CDE)
    • Internal LDO Regulator with Up to 100mA Load
  • IEEE 802.3af-Compliant Features Reduce Design Time
    • PoE Class 1/Class 2 Classification Set with Single Resistor
    • Intelligent Maintain Power Signature (MPS) Complies with IEEE 802.3af Specification
    • Simplified Wall Adapter Interface
    • Pass 2kV, 200m CAT-6 Cable Discharge Event
  • High Efficiency During Light Loads Reduces Power Consumption
    • Sleep and Ultra-Low-Power Mode
    • Frequency Foldback for High-Efficiency Light-Load Operation
    • Back-Bias Capability to Optimize the Efficiency
  • Robust Performance
    • 8.7V to 60V Wide Input Voltage Range
    • Hiccup-Mode Runaway Current Limit
    • 49mA (typ) Inrush Current Limit
    • Open-Drain (Active-Low RESET) Output
  • Easy to Design With
    • 3.2V to 14V Programmable Output Voltage Range
    • Internal Compensation
    • Fixed 430kHz Switching Frequency
MAX5991
IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2 Powered Devices with Integrated DC-DC Converter
MAX5991A, MAX5991B: Functional Diagram
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