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LTC4257 - IEEE 802.3af PD Power over Ethernet Interface Controller

Features

  • Complete Power Interface Port for IEEE 802.3af® Powered Devices (PDs).
  • Onboard 100V, 400mA Power MOSFET.
  • Precision Input Current Limit.
  • Onboard 25k Signature Resistor.
  • Programmable Classification Current (Class 0-4).
  • Undervoltage Lockout.
  • Smart Thermal Protection.
  • Power Good Signal.
  • Available in 8-Pin SO and Low Profile (3mm × 3mm) DFN Packages U.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (LTC4257_LinearTechnology.pdf) that lists specifications for multiple related part numbers.

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Full PDF Text Transcription

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U U LTC4257 IEEE 802.3af PD Power over Ethernet Interface Controller FEATURES ■ Complete Power Interface Port for IEEE 802.3af® Powered Devices (PDs) ■ Onboard 100V, 400mA Power MOSFET ■ Precision Input Current Limit ■ Onboard 25k Signature Resistor ■ Programmable Classification Current (Class 0-4) ■ Undervoltage Lockout ■ Smart Thermal Protection ■ Power Good Signal ■ Available in 8-Pin SO and Low Profile (3mm × 3mm) DFN Packages U APPLICATIO S ■ IP Phone Power Management ■ Wireless Access Points ■ Telecom Power Control DESCRIPTIO The LTC®4257 provides complete signature and power interface functions for a device operating in an IEEE 802.3af Power over Ethernet (PoE) system.
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