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LINEAR TECHNOLOGY  LTC4271IUF#PBF  PSE CONTROLLER, 3.3V, QFN-24

LINEAR TECHNOLOGY LTC4271IUF#PBF
Technical Data Sheet (398.51KB) EN See all Technical Docs

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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 0.25Ω 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
  • 0.25Ω Sense resistance per channel
  • Very high reliability 4-Point PD detection
  • 2-point Forced voltage
  • 2-point Forced current
  • VEE and VPORT Monitoring

 

Product Information

Input Voltage:
3.3V
Output Current:
-
UVLO:
25V
Controller IC Case Style:
QFN
No. of Pins:
24Pins
Duty Cycle (%):
-
Frequency:
1MHz
Operating Temperature Min:
-40°C
Operating Temperature Max:
85°C
Packaging:
Each
Product Range:
-
MSL:
MSL 1 - Unlimited
Supply Current:
10 mA
SVHC:
No SVHC (17-Dec-2015)
Digital IC Case Style:
QFN

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Applications

  • Communications & Networking

Legislation and Environmental

Moisture Sensitivity Level:
MSL 1 - Unlimited
RoHS Compliant:
Yes

Substitutes

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