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reference designLTC4291-1

Analog Devices LTC4291-1

4-Port IEEE 802.3bt PoE PSE Controller

Overview

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Description

The LTC®4291-1/LTC4292 chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC4291-1/LTC4292 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4291-1/LTC4292 chipset delivers lowest-in-indus¬try heat dissipation by utilizing low RDS(ON) external MOSFETs and 0.15Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V sup¬ply, resulting in significant BOM cost savings. Advanced power management features include per-port 14 bit current monitoring, programmable current limit, and versatile fast shutdown of preselected ports. Advanced power management host software is available under a no-cost license. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC4291-1/LTC4292 includes an I2C serial interface operable up to 1MHz. The LTC4291-1/LTC4292 is pin or I2C programmable to nego¬tiate PD delivered power up to 71.3W.

Features

  • Four PSE Ports nnTwo Power Channels per Port
  • Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
  • Compliant Support for Type 1, 2, 3, and 4 PDs
  • Low Power Path Dissipation per Channel
  • 150mΩ Sense Resistance
  • 30mΩ or Lower MOSFET RDS(ON)
  • Chipset Provides Electrical Isolation
  • Eliminates Optos and Isolated 3.3V Supply
  • Very High Reliability Multipoint PD Detection
  • Connection Check Distinguishes Single- Signature and Dual-Signature PDs
  • Continuous, Dedicated Per-Port Power and Current Monitoring
  • Per-Port Power Policing
  • 1MHz I2C Compatible Serial Control Interface
  • Pin or I2C Programmable PD Power Up to 71.3W
  • Available in a 40-Lead 6mm × 6mm (LTC4292) and 24-Lead 4mm × 4mm (LTC4291-1) QFN Packages

Typical applications

  • PoE PSE Switches/Routers, PoE PSE Midspans

More information

Products

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Order Code
Data­sheet
Simu­lation
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Status
Product series
Data rate
Ports
PoE
Improved CMRR
Operating Temperature
VT(V (RMS))
Mount
L(µH)
SamplesAvailability & Sample
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749022016
SPECWE-LAN LAN Transformer, 1000BASE-T, 1
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Availability
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Downloads4 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-LAN LAN Transformer
Data rate1000BASE-T 
Ports1 
PoEPoE+ (up to 1150 mA) 
Improved Common Mode RejectionNo 
Operating Temperature 0 °C up to +70 °C
Insulation Test Voltage1500 V (RMS)
MountSMT 
Inductance350 µH
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