Datasheet Linear Technology LTC4265CDE#PBF

Manufacturer	Linear Technology
Series	LTC4265
Part Number	LTC4265CDE#PBF

IEEE 802.3 at High Power PD Interface Controller with 2-Event Classification Recognition

Datasheets

Download

PDF, 305 Kb, Revision: B, File uploaded: Oct 25, 2017

Extract from the document

Prices

Packaging

Package	4x3 DFN-12
Package Code	DE/UE
Package Index	05-08-1695

Parametrics

Number of Channels	1
Demo Boards	DC1415A
Design Tools	LTspice Model
Export Control	no
I2C Interface	no
IEEE-Compliant Classification	One Event, Two Event
IEEE-Compliant Detection	Yes (Internal 25k resistor)
IEEE-Compliant Disconnection	N/A
Max Power	25.5 W
Operating Temperature Range	0 to 70 °C
PSE/PD	PD
PoE Type	2

Eco Plan

RoHS

Compliant

Articles

Download
PD Interface for PoE+ Includes 25.5W Classification and Protection Features in a Low Profile 4mm × 3mm DFN &mdash LT Journal
PDF, 616 Kb, File published: Jan 1, 2009
Extract from the document
LвЂ‰DESIGN FEATURES PD Interface for PoE+ Includes 25.5W
Classification and Protection Features
in a Low Profile 4mm Г— 3mm DFN
by Kirk Su Introduction Overview of the Third Generation
Power over Ethernet System (PoE+) The Power over Ethernet (PoE) standard specifies how DC power can be
distributed alongside high speed data through a single RJ45 connector. The
second generation standard (IEEE 802.3af) allows Powered Devices (PDs) to
draw 12.95W from Power Sourcing Equipment (PSEs). The popularity of the
standard has PD equipment vendors running up against the 12.95W power
limit. To answer the call for more power, the newer IEEE 802.3at standard
(also called PoE+) establishes a high power allocation while maintaining
compatibility with the existing IEEE 802.3af systems.
In the new standard, PSEs and PDs are distinguished as Type-1 if they
comply with the IEEE 802.3af power levels, or Type-2 if they comply with
the IEEE 802.3at power levels. The maximum available power to a Type-2
PD is 25.5W.
The IEEE 802.3at standard also establishes a new method for Type-2
equipment to mutually identify each other while maintaining compatibility
with the existing PoE systems. A Type-2 PSE has the option of declaring
the presence of high power by performing 2-event classification (Layer 1)
or by communicating with the PD over the data line (Layer 2). In turn, a
Type-2 PD must recognize both layers of communications and identify a
Type-2 PSE before beginning 25.5W operations. L …

Model Line

Series: LTC4265 (4)

LTC4265CDE#PBF LTC4265CDE#TRPBF LTC4265IDE#PBF LTC4265IDE#TRPBF

Manufacturer's Classification

Monitor, Control and Protection > Power-over-Ethernet (PoE) Interface Controllers > PoE Powered Device (PD)

Other Names:

LTC4265CDEPBF, LTC4265CDE PBF