Power Over Ethernet (POE) Controller, 57 V/-5 mA, 1 MHz Interface, 25V UVLO Threshold, QFN-38

LTC4266IUHF#PBF - Power Over Ethernet (POE) Controller, 57 V/-5 mA, 1 MHz Interface, 25V UVLO Threshold, QFN-38

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Product Overview

The LTC4266IUHF#PBF is a quad PSE Controller designed for use in IEEE 802.3 type 1 and type 2 (high power) compliant power over Ethernet systems. External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heat-sinks even at type 2 power levels. External power components also allow use at very high power levels while remaining otherwise compatible with the IEEE standard. 80V-rated port pins provide robust protection against external faults. The LTC4266 includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify power-management software development, an optional AUTO pin mode provides fully IEEE-compliant standalone operation with no software required. Proprietary 4-point PD detection circuitry minimizes false PD detection while supporting legacy phone operation.
  • Four independent PSE channels
  • Compliant with IEEE 802.3at type 1 and 2
  • 0.34R Total channel resistance
  • 8-bit Programmable current limit (ILIM)
  • 7-bit Programmable overload currents (ICUT)
  • Fast shutdown of preselected ports
  • 14.5-bit Port current/voltage monitoring
  • 2-Event classification
  • Very high reliability
  • 4-point PD detection
  • 2-point Forced voltage
  • 2-point Forced current
  • High capacitance legacy device detection
  • Midspan backoff timer
  • Supports proprietary power levels above 25W


Communications & Networking, Power Management

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MSL 1 - Unlimited
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