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Power Over Ethernet (POE) Controller, 57 V/10 mA, 1 MHz Interface, 25V UVLO Threshold, QFN-24

LTC4271IUF#PBF - Power Over Ethernet (POE) Controller, 57 V/10 mA, 1 MHz Interface, 25V UVLO Threshold, QFN-24

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Product Overview

The LTC4271IUF#PBF is a 12-port Power Sourcing Equipment (PSE) Controller designed for use in IEEE 802.3 at type 1 and type 2 (high power) compliant power over Ethernet (PoE) systems. Transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply resulting in significant BOM cost savings. This chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.25R sense resistors. Advanced power management features include per-port 12‑bit current monitoring ADCs, DAC-programmable current limit and versatile fast shut-down of preselected ports. Advanced power management host software is available under a no-cost license. PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with 2-event classification and a 2 second backoff timer.
  • 12 Independent PSE channels
  • Compliant with IEEE 802.3 at type 1 and 2
  • Chipset provides electrical isolation
  • Eliminates up to 6 high speed opto-couplers
  • Eliminates isolated 3.3V Power supply
  • Low power dissipation
  • 0.25R Sense resistance per channel
  • Very high reliability 4-Point PD detection
  • 2-point Forced voltage
  • 2-point Forced current
  • VEE and VPORT Monitoring


Communications & Networking

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MSL 1 - Unlimited
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