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LTC4271IUF#PBF - 

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

LINEAR TECHNOLOGY LTC4271IUF#PBF

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Manufacturer Part No:
LTC4271IUF#PBF
Order Code:
2313466
Technical Datasheet:
(EN)
See all Technical Docs

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

Applications

Communications & Networking

Product Information

:
3.3V
:
-
:
25V
:
QFN
:
24Pins
:
-
:
1MHz
:
-40°C
:
85°C
:
Each
:
-
:
MSL 1 - Unlimited
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