LTC4274: Single PoE+ PSE Controller Data Sheet7/13/2017395K
Features and Benefits
- 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
- 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 LTC4266 SW Compatible
- 1MHz I2C Compatible Serial Control Interface
- Midspan Backoff Timer
- Supports Proprietary Power Levels Above 25W
- Available in 38-Pin 5mm × 7mm QFN Package
The LTC4274 is a single power sourcing equipment 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 LTC4274 includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify 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 LTC4274 is available in a 5mm × 7mm QFN package that significantly reduces board space compared with competing solutions.
- PSE Switches/Routers
- PSE Midspans
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
DC590B - Demo Board
Demonstration circuit 1567B features the LTC4274, a single power sourcing equipment (PSE) controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) compliant Power over Ethernet (PoE) systems. The LTC4274 is configured in the DC1567B as a midspan power injector where data comes in from an existing network system and out, along with power, to a powered device (PD). The LTC4274 autonomously detects and classifies a PD, turns power on to the port, and disconnects port power without the need for a microcontroller. A two second backoff timer supports the midspan configuration. A 55V nomical supply is recommended to power the demo board.
Documentation & Resources
R547 Reliability Data3/26/2018146 K
DC1567B - Demo Manual (Rev. B)10/5/2015436K
Power over Ethernet Solutions4/4/20171 M
PoE PD Controllers6/22/2015552K
LTPoE++ PSE Controllers6/10/2013886K
PoE+ for the Power Hungry4/28/2010683K
Next Generation Power Over Ethernet7/11/2021
PoE++ Video Product Brief10/15/2018
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC4274 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC4274CUHF#PBF||Material Declaration||Reliability Data||38-Lead QFN (5mm x 7mm w/ EP)|
|LTC4274CUHF#TRPBF||Material Declaration||Reliability Data||38-Lead QFN (5mm x 7mm w/ EP)|
|LTC4274IUHF#PBF||Material Declaration||Reliability Data||38-Lead QFN (5mm x 7mm w/ EP)|
|LTC4274IUHF#TRPBF||Material Declaration||Reliability Data||38-Lead QFN (5mm x 7mm w/ EP)|
|Wafer Fabrication Data||R547 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.