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Linear Introduces Single-Port Power over Ethernet Controller for Powered Devices

Thursday, November 1, 2018

Linear introduces the LTC4279, a single-port Power over Ethernet (PoE) controller for power-supply devices (PSE) that delivers up to 123W for applications requiring high power through CAT-5e cables. The need for higher power delivery comes from a wide range of applications, including LTE picocells, LED signage, security surveillance systems, home automation and machine vision systems. The highly versatile LTC4279 provides power to a wide range of powered devices (PDs). This includes all legacy (<13W), IEEE 802.3at Type 1 (13W) and Type 2 (25.5W) PDs, as well as Linear Technology's proprietary LTPoE++ (up to 90W) and custom (<123W) PDs. The device supports two-wire and 4-wire output topologies, as well as single and dual feature architectures. Resistor-adjustable power options make the LTC4279 easy to configure for multiple outlets, simplifying design and bill of materials.

The LTC4279 provides fully autonomous operation for a wide range of PSE applications, including endpoint and mid-span power injectors. A low power sense resistor and external MOSFET simplify the thermal design; the traditional PSE uses a higher RDS(ON) and less robust MOSFET. The discovery of PD is accomplished using a highly reliable 4-point detection mechanism to ensure best-in-class resistance to PD false detection. The LTC4279 provides a rich set of PD grading mechanisms for broad system compatibility. Robustness is enhanced with grading based current cutoff and limit thresholds, short circuit protection and ±80V cable surge protection.

The LTC4279 is available in an industrial temperature grade (–40°C to 85°C) in a RoHS-compliant 4mm x 5mm QFN-20 and SO-16 package. The LTC4279 is priced at $3.45 each in 1,000-piece quantities and is available for production. The LTC4279 combines with the LT4275 and LT4276 PD controllers to achieve an end-to-end design of up to 123W.

Relevant LTC42 series products

Part Number  Mfg Code   Stock (pcs)

 RoHS 

 Category

 Unit Price($) 

LTC4255CG

Linear Technology

517

RoHS

Quad Network Power Controller with I2C Compatible Interface

RFQ

LTC4251IS6

Linear Technology

280

RoHS

RFQ

Linear Technology

99

RoHS

Single IEEE 802.3af Compliant PSE Controller with Internal Switch

RFQ

Linear Technology

2115

RoHS

CompactPCI Hot Swap Controller with I2C Compatible Interface

RFQ

Author:Brittany Antonia (The author of article owns the copyright.)