Controller til ny 'Power over Ethernet' standard med kapabilitet på over 70W

Linear Technology lancerer første interface-controller til den nye Power over Ethernet (PoE) standard, IEEE 802.3bt, der gør det muligt at levere over 70W (in english).

Linear Technology is poised to be first to market with next-generation IEEE-compliant products. 
The LT4295 is a single-signature 802.3bt PD controller that integrates an isolated switching regulator controller, capable of synchronous operation in both high efficiency forward and no-opto flyback topologies with auxiliary power support. This high level of integration simplifies front end PD designs by reducing component count and board space, allowing the LT4295 to efficiently deliver power to PD loads using just one IC.

Unlike traditional PD controllers that integrate the power MOSFET, the LT4295 controls an external MOSFET to significantly reduce overall PD heat dissipation and maximize power efficiency, particularly important at 802.3bt’s higher power levels. 

The LT4295 is offered in industrial and automotive grades, supporting operating temperature ranges from –40°C to 85°C and –40°C to 125°C, respectively. The LT4295 provides an upgrade path from Linear Technology’s existing PoE+ PD controllers, including the LT4276 or LT4275. To further maximize available power and reduce heat dissipation in PDs, use the LT4321 ideal diode bridge controller.

www.linear.com/product/LT4295