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Analog Devices LTC4279 | Demoboard DC2579A

Single Port PoE/PoE+/LTPoE++ PSE Controller

Overview

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IC revision1

Description

The LTC4279 is an autonomous single port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1, Type 2 and LTPoE++ compliant Power over Ethernet (PoE) systems. The LTC4279 provides fully autonomous IEEE 802.3 and LTPoE++ compliant operation without a microcontroller. The LTC4279 simplifies PSE implementation, requiring only a single supply and a small number of passive support components.The LTC4279 delivers lowest-in-industry heat dissipation by utilizing a low-RDS(ON) external MOSFET and a 0.1Ω sense resistor, eliminating the need for expensive heat sinks and increasing efficiency.PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with physical layer classification and a 2.5 second backoff timer.Legacy and custom PDs are supported with pin-selectable LEGACY and UltraPWR modes. LEGACY mode detects and powers pre-IEEE specification PDs. UltraPWR mode aggressively turns on and powers custom PDs requiring high inrush and/or operational currents.

Features

  • Compliant with IEEE 802.3at Type 1 and 2
  • Supports LTPoE++® Up to 90W
  • Supports Dual-Signature PDs
  • Fully Autonomous Operation without Microcontroller
  • Very Low Power Dissipation
  • 0.1Ω Sense Resistance
  • Low RDS(ON) External MOSFET
  • Very High Reliability 4-Point PD Detection
  • 2-Point Forced Voltage and Forced Current
  • Robust Short-Circuit Protection
  • Cable Surge Protected ±80V OUT pin
  • Classification Dependent ICUT and ILIM Current Thresholds
  • Supports 2-Pair and 4-Pair Output Power
  • UltraPWR Mode Supports Custom PDs up to 123W
  • Pin-Selectable Detection Backoff Timer for Midspans
  • Pin Programmable Legacy PD Detection
  • Pin Programmable Maximum Power Mode
  • Status LED Pin
  • Available in 20-Pin QFN and 16-Pin SO Packages

Typical applications

  • PoE PSE Endpoints (Switch/Router), PoE Midspan Power Injectors, Power Forwarders, Femto Cells, Security Systems

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL
(mm)
f
(mm)
xPxCApplication SystemH
(mm)
Operation Force (Value)
(g)
Electrical Life
(Cycles)
Actuator ColorVaporphase processData ratePortsPoEImproved CMRROperating TemperatureVT
(V (RMS))
MountL
(µH)
Pins (Value)
(pcs)
RowsGenderTypeIR
(A)
Packaging Samples
62000311121SPEC
6 files WR-PHD 2.00 mm THT Pin Header 6 -40 °C up to +105 °C THT 3 Single Pin Header Straight 2 Bag
702935000SPEC
3 files WA-SNSR Self-Retaining Spacer 12.7 4.8 -30 °C up to +85 °C
7490220123SPEC
8 files WE-LAN LAN Transformer 18.04 9.05 1000 Base-T 1 4PPoE (up to 1500 mA) No -40 °C up to +105 °C 1500 SMT 180 24 4PPoE (to 1400 mA)
615008142621SPEC
7 files WR-MJ Modular Jack Horizontal Shielded Rear Grounding Post 8P8C Tab Down 8P8C CAT 3 1x1 -40 °C up to +85 °C THT Horizontal 1.5 Tray
434123050816SPEC
5 files WS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm 5 160 50000 Black not specified -40 °C up to +85 °C 0.05 Tape and Reel
60800213421SPEC
3 files WR-PHD 2.00 mm Jumper with Test Point -25 °C up to +105 °C 2 Jumper 3 Bag
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL
(mm)
f
(mm)
xPxCApplication SystemH
(mm)
Operation Force (Value)
(g)
Electrical Life
(Cycles)
Actuator ColorVaporphase processData ratePortsPoEImproved CMRROperating TemperatureVT
(V (RMS))
MountL
(µH)
Pins (Value)
(pcs)
RowsGenderTypeIR
(A)
Packaging Samples