'Power over Ethernet' IC leverer 123W gennem CAT5e kabel

Linear Technology lancerer single-port 'Power over Ethernet, PoE' controller, der gør muligt at overføre ikke mindre end 123W gennem et 1 Gbit/s CAT5e kabel (in english).

Demand for higher power delivery comes from a widespread set of applications, including LTE picocell base stations, LED signage, security monitoring systems, home automation and machine vision systems. The highly versatile LTC4279 delivers power to a wide variety of powered devices (PDs).

This includes all legacy (<13W), IEEE 802.3at Type 1 (13W) and Type 2 (25.5W) PDs, Linear’s proprietary LTPoE++ (up to 90W), and custom (<123W) PDs. 2-pair and 4-pair output topologies are supported, as well as single-signature and dual-signature architectures. Resistor-adjustable power selection allows the LTC4279 to be easily configured for multiple sockets, simplifying design and bill of materials.

The LTC4279 provides fully autonomous operation for a wide variety of PSE applications, including endpoints and midspan power injectors. A low power sense resistor and external MOSFET simplify thermal design; traditional PSEs utilize less robust MOSFETs with higher RDS(ON). PD discovery is accomplished using a high reliability 4-point detection mechanism that ensures best-in-class immunity from false PD detection. The LTC4279 provides a comprehensive set of PD classification mechanisms to enable wide system compatibility. Robustness is reinforced with classification-dependent current cutoff and limit thresholds, short-circuit protection and ±80V cable surge protection.

The LTC4279 is offered in the industrial temperature grade (–40°C to 85°C) and is available in RoHS-compliant 4mm x 5mm QFN-20 and SO-16 packages. The LTC4279, combined with the LT4275 and LT4276 PD controllers, enable up to 123W end-to-end design. www.linear.com/product/LTC4279