LTC4266

PRODUCTION

Quad IEEE 802.3at Power Over Ethernet Controller

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Overview

  • Four Independent PSE Channels
  • Compliant with IEEE 802.3at Type 1 and 2
  • 0.34Ω Total Channel Resistance
    • 130mW/Port at 600mA
  • Advanced Power Management
    • 8-Bit Programmable Current Limit (ILIM)
    • 7-Bit Programmable Overload Currents (ICUT)
    • Fast Shutdown of Preselected Ports
    • 14.5-Bit Port Current/Voltage Monitoring
    • 2-Event Classification
  • Very High Reliability 4-Point PD Detection
    • 2-Point Forced Voltage
    • 2-Point Forced Current
  • High Capacitance Legacy Device Detection
  • LTC4259A-1 and LTC4258 Pin and SW Compatible
  • 1MHz I2C Compatible Serial Control Interface
  • Midspan Backoff Timer
  • Supports Proprietary Power Levels Above 25W
  • Available in 38-Pin 5mm × 7mm QFN and 36-Pin SSOP Packages

The LTC4266 is a quad PSE controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) compliant Power over Ethernet systems. External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heatsinks even at Type 2 power levels. External power components also allow use at very high power levels while remaining otherwise compatible with the IEEE standard. 80V-rated port pins provide robust protection against external faults.

The LTC4266 includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify power-management software development; an optional AUTO pin mode provides fully IEEE-compliant standalone operation with no software required. Proprietary 4-point PD detection circuitry minimizes false PD detection while supporting legacy phone operation. Midspan operation is supported with built-in 2-event classification and backoff timing. Host communication is via a 1MHz I2C serial interface.

The LTC4266 is available in a 5mm × 7mm QFN package that significantly reduces board space compared with competing solutions. A legacy-compatible 36-pin SSOP package is also available.

Applications

  • High Power PSE Switches/Routers
  • High Power PSE Midspans
LTC4266
Quad IEEE 802.3at Power Over Ethernet Controller
Complete 4-Port Ethernet High Power Source Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 3

User Guide 1

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

Evaluation Software 1

Software Interface Data Sheet and Software

The software interface data sheet for this PSE may be requested from the Software Request Form (SRF). This data sheet describes the I2C interface and programming details for the respective PSE controller.

Reference software for IEEE 802.3at Semi-auto mode operation is available for this PSE controller and may be requested from the Software Request Form.

Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers & Isolators 1
LTM2883
PRODUCTION SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
Power-over-Ethernet (PoE) Controllers 2
LTC4266A
LTC4266C
Quad PoE/PoE+/LTPoE++ PSE Controller
LTC4270
PRODUCTION 12-Port PoE/PoE+/LTPoE++ PSE Analog Controller
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Evaluation Kits

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schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1366B

LTC4266 Demo Board | 25.5W PoE + 4-Port Midspan PSE (Requires DC590)

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Product Details

Demonstration circuit DC1366B features the LTC4266, a quad network power controller with I2C® interface, designed for use in IEEE 802.3at compliant Power Sourcing Equipment (PSE). Integrated into a tiny 5mm × 7mm 38-pin QFN package are four independent channels controlling external N-channel power MOSFETs.
DC1366B
LTC4266 Demo Board | 25.5W PoE + 4-Port Midspan PSE (Requires DC590)
DC1366B Application Circuit DC1366B Application Circuit DC1366B Application Circuit DC1366B Application Circuit EA Certified 4

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