Features and Benefits

  • IEEE 802.3cg Compliant
  • Wide Input Voltage Range: 2.3V to 60V
  • Supports Serial Communication Classification Protocol (SCCP)
  • Wakeup Signature
  • Integrated 3.5V Standby Regulator
  • 150μA Maximum Current During Classification
  • Drives Low-Side Bridge MOSFETs for Polarity Correction
  • Charge Pump Enhances External N-Channel MOSFET
  • Pin Programmable Class Configuration
  • Available in 12-Pin MSOP and DFN 4mm × 3mm Packages

Product Details

The LTC9111 is an IEEE 802.3cg compliant Single-Pair Power over Ethernet (SPoE) Powered Device (PD) controller. A wide 2.3V to 60V operating range capability with polarity correction make the LTC9111 particularly well suited for classification-based systems in building and factory automation.

SCCP-based classification ensures full operating voltage is applied by the Power Sourcing Equipment (PSE) only when a valid PD is connected. The LTC9111 drives two external N-channel MOSFET switches during classification with micropower operation to minimize reservoir capacitor requirements. An external N-channel MOSFET switch isolates the output capacitance from the connector during classification and inrush. A voltage supervisor enables the external MOSFET when the PD input voltage exceeds the ON voltage threshold for the configured class and after a mandated delay. The EN output asserts after the controlled GATE pin ramp-up. The MOSFET is disabled if the input voltage drops below the OFF voltage threshold for the configured class. The LTC9111 drives a pair of external low-side N-channel MOSFETs with a low start-up voltage of 1.6V for polarity correction with reduced power losses.


  • Building Automation
  • Factory Automation
  • Security Systems
  • Traffic Control Systems

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Documentation & Resources

Design Resources

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