Power over Ethernet Solutions Datasheet by Analog Devices Inc.

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ANALOG DEVICES AAAAAAAAAAA '5 POSSIBLE“
POWER
OVER ETHERNET
SOLUTIONS
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Power and Data Over a Single Ethernet Cable
Simplified Wire Management
Reach Difficult Locations
High Port Density
Up to 123W of Delivered Power
More End Application Features
Only 1 Port and 1 Cable Required
Central Power Management
Remotely Power Nodes On/Off
Monitor and Measure Energy Usage
Adjust Load Profiles or Settings On-the-Fly
PoE Benefits
DATA PAIR
DATA PAIR
0.15Ω
–55V
RJ45
1
2
1
2
3
6
3
6
RJ45
DC/DC
CONVERTER
+
VOUT
–55V 0.15Ω
DATA PAIR
DATA PAIR
4
5
4
5
7
8
7
8
PD
VEE GATEBSENSEB OUTB
VEE GATEASENSEA OUTA
PSE
Controller
GND
–VIN
RCLASS
PD
Controller
–VOUT
PSE
PWRGD
Endpolnl Elharnst Swltch .. 9- _ ANALOG DEVICES
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Power Sourcing Equipment (PSE)
PSE Types
1) Endpoint—provides data and power, typically used to build new PoE networks.
2) Midspan (Injector)—provides power and passes data, typically used to add PoE capability to existing non-PoE networks.
3) Extender (Power Forwarder)—provides data and power, typically used to extend PoE networks beyond 100m.
PSE Controllers
Requirements
Isolation Isolate supply and communications from chassis ground. The 4-port LTC®4291-1/LTC4292, 8-port LTC4290/LTC4271 and 12-port
LTC4270/LTC4271 PSE chipsets eliminate up to six expensive opto-couplers
and an isolated supply by using less expensive (andmore reliable) 10/100
Ethernet transformers.
Detection Detect valid PD signatures (25kΩ) using a 2-point current or 2-point
voltage detection scheme, as well as reject invalid PDsignatures
(<15kΩ and >33kΩ). Use connection check sub-routine to determine
single-signature or dual-signature topology.
Analog Devices PSE controllers use at least a 4-point (two voltages and two
currents) detection scheme to eliminate false-positives that could power invalid
PDs, including NICs or shorted ports. Detection of legacy PDs that predate the
original IEEE 802.3af standard can also be manually enabledonaper port
basis. Single-signature and dual-signature topologies are supported.
Classification Type 1 PSEs can use a 1-event hardware classification scheme to
detect optional PD classification signatures andlimit the power draw.
Type 2 or greater PSEs can use either hardware or software—link layer
discovery protocol (LLDP)—classification schemes.
Analog Devices PSE controllers use up to 5-event hardware classification
toclassify PDs.
Regulation Regulate port power-up to 15.4W for Type 1 PDs, 30Wfor Type 2, 60W
for Type 3 and 90W for Type 4.
Analog Devices PSE controllers use external MOSFETs and sense resistors
to regulate voltages and currents to IEEE standards, resulting in lower total
channel resistance (higher efficiency) and increased robustness.
Protection No requirement. Analog Devices PSE controllers have 70V to 80V port pinsand come with
standard or custom recommendations forguarding against surge.
Endpoint Endpoint
Extender
Ethernet Switch
1) Endpoint PSE 2) Midspan PSE 3) Extender PSE
PD
PD PD
Data Data and Power
Midspan
(<100m)
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Advanced Power Management
SoftwareandHardware
Analog Devices PSEs support a variety of operating modes
and includeper-port current monitoring, supply monitoring,
one second current averaging and field-upgradeable firmware.
Analog Devices provides Clibraries for customer systems at mul-
tiplelevels, fromcontrol of basic PSE operation to management
ofoverallocated and prioritized PoE switchsystems.
Mode Auto Pin Detect/Class Power-Up
Automatic
ICUT/ILIM
Assignment
AUTO 1Enabled at Reset Automatically Yes
Semi-auto 0Host Enabled Upon Request No
Manual 0Once Upon
Request Upon Request No
Shutdown 0 Disabled Disabled No
PSE Example: Isolated 4-Port IEEE802.3bt PSE Chipset
Extended Power
Analog Devices PSE and PD controllers provide up to 90W of
power at the PD’s RJ45 input, while ensuring backward compat-
ibility and interoperability with Type 1 and 2 equipment. Type3
and 4 equipment and LTPoE++ controllers operate exclusively.
DEVICE PSE
STANDARD 802.3at LTPoE++
TYPE TYPE 1 TYPE 2 38.7W 52.7W 70W 90W
PD
802.3at
TYPE 1 13W 13W 13W 13W 13W 13W
TYPE 2 13W 25.5W 25.5W 25.5W 25.5W 25.5W
LTPoE++
38.7W 13W 25.5W 38.7W 38.7W 38.7W 38.7W
52.7W 13W 25.5W 52.7W 52.7W 52.7W
70W 13W 25.5W 70W 70W
90W 13W 25.5W – – – 90W
LTC4291-1 LTC4292
GP0
GP1
4PVALID
RESET
MSD
AUTO
SCL
AD0
AD1
AD2
AD3
DGND CAP1
SDAIN
SDAOUT
VDD
SENSE1A
GATE1A
OUT1A
PWRMD0 PWRMD1
SENSE1B
GATE1B
OUT1B
CAP2 VEE
AGND VSSK12
INT
3.3V
3.3V
–55V
3.3V –55V
100V
S1B
S1B
–55V
–55V
S1B
S1B
PORT1B
PORT1A
0.15Ω
0.15Ω
–55V
Robust Surge Protection
Low Cost Isolation Efficient Regulation
Effective
Detection
and Simple
Classification
No Isolation
Required on
I2C Interface
DEVICE PSE
STANDARD 802.3bt
TYPE TYPE 1 TYPE 2 TYPE 3 TYPE 4
PD
802.3bt
TYPE 1 13W 13W 13W 13W
TYPE 2 13W 25.5W 25.5W 25.5W
TYPE 3 13W 25.5W 40W, 51W 40W, 51W
TYPE 4 13W 25.5W 40W, 51W 62W, 71.3W
an E33 ”2932” 339a
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Cabling and Magnetics
PSE Controller Selection
Low EMI
Analog Devices PSEs use preventative techniques
to minimize electromagnetic interference (EMI).
For example, the blue lineinthe graph shows the
GTEM radiated emissions scan for the 12-port
LTC4270/LTC4271demo board (DC1840), which
is safelybelow the CISPR22 ClassB limit, rep-
resented by the red line, with some appreciable
margin to spare.
Standard
PD Input
Power
# of Cables
Required
Pairs Used
(Out of 4)
Cable Bundle
Size
Rec Cable
Type
Max Pairset
Current Magnetics
PoE (IEEE 802.3af)13W
1
2
100
CAT-5 350mA Standard
PoE+ (IEEE 802.3at)25.5W 600mA
PoE++ (IEEE 802.3bt)
40W
4 CAT-5e
560mA
High Power
51W 692mA
62W 80 794mA
71.3W 948mA
Analog Devices LTPoE++
38.7W 100 464mA
52.7W 726mA
70W 80 908mA
90W 25 1279mA
FREQUENCY (MHz)
0
–20
RADIATED EMISSIONS (dBµV/m)
–10
0
10
20
300 400
40
100 200 700 800 900500 600 1000
30
GTEM CELL MEASUREMENT
CORRECTED PER IEC 61000-4-20
DETECTOR = PEAK HOLD
RBW = 120kHz
VBW = 300kHz
SWEEP TIME = 680ms
# OF POINTS = 8084
DC1840
CISPR 22 CLASS B LIMIT
NOISE FLOOR
Part Number
Number
of Ports
Internal
Isolation
Standard
PD Input
Power
Packages
(mm)Demo BoardsLTPoE++ PoE++ PoE+PoE
LTC4270A/LTC4271 12 90W 7 × 8 QFN-52 / 4 × 4 QFN-24 DC1679 + SB002
LTC4270B/LTC4271 12 25.5W 7 × 8 QFN-52 / 4 × 4 QFN-24 DC1840
LTC4270C/LTC4271 12 13W 7 × 8 QFN-52 / 4 × 4 QFN-24 DC1680 + SB021
LTC4290A/LTC4271 8 90W 6 × 6 QFN-40 / 4 × 4 QFN-24 DC1679 + SB073
LTC4290B/LTC4271 8 25.5W 6 × 6 QFN-40 / 4 × 4 QFN-24 DC1843
LTC4290C/LTC4271 8 13W 6 × 6 QFN-40 / 4 × 4 QFN-24 DC1680 + SB090
LTC4291-1/LTC4292 4 71.3W 6 × 6 QFN-40 / 4 × 4 QFN-24 DC2685
LTC4266A 4 • • 90W 5 × 7 QFN-38 DC1815
LTC4266 4 • 25.5W 5 × 7 QFN-38, SSOP-36 DC1366
LTC4266C 4 • 13W 5 × 7 QFN-38
LTC4279 1 • • 123W 4 × 5 QFN-20, SO-16 DC2541, DC2579
LTC4274A 1 • • 90W 5 × 7 QFN-38 DC1814
LTC4274 1 • 25.5W 5 × 7 QFN-38 DC1567
LTC4274C 1 • 13W 5 × 7 QFN-38
LTC4263 1 • 13W 4 × 3 DFN-14, SO-14 DC981A/B
PSE
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Powered Device (PD)
PD Examples
XSecurity Cameras
XAccess Points, Femtocells and Antennas
XIP Telephony (VoIP) and Call Stations
XHVAC, Lighting and Signage
XMedical Equipment
XTouchscreen Panels and Infotainment
XPoint-of-Sale Readers and RFID Readers
Requirements
Isolation Isolate supply and communications from chassis ground. Analog Devices PDs with integrated DC/DC converters support isolated
forward and flyback topologies. Analog Devices’ active-clamp forward
configuration reduces costly transformer count and sizes, while the
no-opto flyback configuration eliminates expensive and unreliableopto-
couplers that are typically used in the feedback circuitry.
Detection Present a signature (25kΩ) to PSE. All Analog Devices PD controllers integrate a 25kΩ signature resistor
tosimplify designs.
Classification Type 1 PDs can support 1-event hardware classification. Type 2 or
greater PDs must support both hardware and software—link layer
discovery protocol (LLDP)—classification.
All Analog Devices PD controllers support up to 5-event hardware
classification, letting the PSE know that it is an IEEE or LTPoE++ PD.
Polarity Correction Power can be applied to either the data or spare pairs inthe
Ethernetcable.
Analog Devices’ LT®4321 ideal diode bridge controller replaces the two
diode bridge rectifiers, typically found at the RJ45 input, with MOSFETs
to correct polarity, increase efficiency and eliminate heat issues.
Regulation No requirement. Analog Devices offers PD controllers without DC/DC controllers, providing
designers with the flexibility to choose their own DC/DC controllers, as
well as PD controllers that integrate high efficiency DC/DC controllers
tosimplifydesigns.
Protection No requirement. All Analog Devices PD controllers have 100V port pins, thermal protection
and come with standard recommendations for guarding against
surge. Newer devices support a maximum junction temperature range
of–40°Cto 125°C.
PD Controllers
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Very Efficient
Using low resistance components, including low
RDS(ON) MOSFETs controlled by the LT4321 ideal
diode bridge controller, Analog Devices PDs
provide up to 94% efficiency from the RJ45 input
to the load, for simplified thermal designs and
more power to the load. The load is able to har-
ness more energy, and designs more easily stay
withinpowerbudgets.
Extremely Low Heat
Analog Devices PD solutions generate much less
heat whiledelivering much more power than
alternatives. Analog Devices’ latest genera-
tionofPD controllers utilize external MOSFETs
and sense resistors to enable users to choose low
resistance components in order to minimize heat
dissipation, while increasing efficiency andreli-
ability. Similarly, theLT4320 and LT4321diode
bridge controllers replace diodeswith MOSFETs
to lower channel resistanceand improve thermal
performance.
Simple Topology
All Analog Devices PD controllers use a single-
signature PD topology to simplify designs and
reduce costs. IEEE 802.3bt also introduced the
dual-signature PD topology, which is a complex
and costly implementation that calls for two
PD controllers, two detection resistors and two
classification results to support two independent
PD loads. Both single and dual PD topologies can
support two loads.
Single-Signature PD Dual-Signature PD
RJ45
1
2
6
4
3
5
7
8
1000BASE-T
TX1
TX2
TX3
TX4
PD
+
VOUT
RJ45
1
2
6
4
3
5
7
8
1000BASE-T
TX1
TX2
TX3
TX4
+
VOUT1
+
VOUT2
CABLE CURRENT (mA)
0
200
400
600
800
1000
1200
1400
1600
0
0.5
1.0
1.5
2.0
2.5
3.0
POWER DISSIPATION (W)
LT4321 Power Savings Up to Type 4
Schottky Diodes (B2100)
POWER
SAVED
Silicon Diodes (S2B)
LT4321 (30m MOSFETs)
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PD Controller Selection
PD Example: High Efficiency PoE++ PD Solution with 12VDC and 24VAC Auxiliary Input
LT4320
AUX INPUT
DC TO 600Hz
DATA
PAIRS
1
2
3
6
4
+
VOUT
5
8
7
DATA
PAIRS
LT4321
FORWARD OR
FLYBACK
DISCRETES
LT4295
PoE Diode Bridge Controller
Maximizes Power Efficiency
Reduces Heat, Eliminates Thermal
Design Problems
Less Than 800µA Quiescent
Operating Current
Fully Compatible with IEEE 802.3
Detection and Classification
PD Forward/Flyback Controller
IEEE 802.3bt Compliant
High Efficiency Forward or No-Opto
Flyback Operation
Superior Surge Protection (100V)
Wide Junction Temperature Range
(–40°C to125°C)
Ideal Diode Bridge Controller
Maximizes Power Efficiency
Reduces Heat, Eliminates Thermal
Design Problems
DC to 600Hz
9V to 72V Operating Voltage Range
IQ = 1.5mA (Typical)
*All Analog Devices PD Controllers integrate a signature resistor.
Part Number Standard
PD Input Power Integrated
DC/DC
Controller
DC/DC
Topology
Integrated
HotSwap
MOSFET
Temp
Range
Package Dimensions
(mm)
13W 25.5W 71.3W 90W
LTC4257 PoE C, I 3 × 3 DFN-8, SO-8
LTC4267 PoE Flyback C, I 5 × 3 DFN-16, SO-16
LTC4265 PoE+• • C, I 4 × 3 DFN-12
LTC4269-1 PoE+• • Flyback C, I 7 × 4 DFN-32
LTC4269-2 PoE+• • Forward C, I 7 × 4 DFN-32
LTC4278 PoE+• • Flyback C, I 7 × 4 DFN-32
LT4275A LTPoE++ • • I, H 3 × 3 DFN-10, MSOP-10
LT4275B PoE+• • I, H 3 × 3 DFN-10, MSOP-10
LT4275C PoE I, H 3 × 3 DFN-10, MSOP-10
LT4276A LTPoE++ Forward, Flyback I, H 4 × 5 QFN-28
LT4276B PoE+ Forward, Flyback I, H 4 × 5 QFN-28
LT4276C PoE Forward, Flyback I, H 4 × 5 QFN-28
LT4294 PoE++ • • • I, H 3 × 3 DFN-10, MSOP-10
LT4295 PoE++ Forward, Flyback I, H 4 × 5 QFN-28
LT4293 LTPoE++
PoE++
• • • • I, H 3 × 3 DFN-10, MSOP-10
ANALOG DEVICES AHEAD ur ww‘s pussmm
Analog Devices, Inc.
Worldwide Headquarters
Analog Devices, Inc.
One Technology Way
P.O. Box 9106
Norwood, MA 02062-9106
U.S.A.
Tel: 781.329.4700
(800.262.5643, U.S.A. only)
Fax: 781.461.3113
Analog Devices, Inc.
Europe Headquarters
Analog Devices GmbH
Otl-Aicher-Str. 60-64
80807 München
Germany
Tel: 49.89.76903.0
Fax: 49.89.76903.157
Analog Devices, Inc.
Japan Headquarters
Analog Devices, KK
New Pier Takeshiba
South Tower Building
1-16-1 Kaigan, Minato-ku,
Tokyo, 105-6891
Japan
Tel: 813.5402.8200
Fax: 813.5402.1064
Analog Devices, Inc.
Asia Pacific Headquarters
Analog Devices
5F, Sandhill Plaza
2290 Zuchongzhi Road
Zhangjiang Hi-Tech Park
Pudong New District
Shanghai, China 201203
Tel: 86.21.2320.8000
Fax: 86.21.2320.8222
©2016-2019 Analog Devices, Inc. All rights reserved. Trademarks
and registered trademarks are the property of their respective
owners. Ahead of What’s Possible is a trademark of Analog Devices.
BRPoES-2/19(E)
analog.com
PD Demo Boards
XComplete ready to copy-and-paste reference designs, including
schematics, BOMs and layoutfiles
XSimultaneously evaluate PD controllers and ideal diodebridges
XMagnetics sized and specified for exact load voltages andcurrents
XCompatible with existing Analog Devices PSE demoboards
IC Part Number Standard PD Input Power
Output
(V/I)
Input
Voltage
Input-to-Output
Efficiency
Demo Board
Part Number
LTC4267 PoE 3.84W 3.3V/1A 38V to 57V 75.0% DC804B-A
LTC4267 PoE 13W 3.3V/2.6A 37V to 57V 78.0% DC917A
LTC4267 PoE 13W 12V/0.9A 37V to 57V 85.0% DC1145B
LTC4267 PoE 13W 1.8V/2.5A,
2.5V/1.5A, 3.3V/0.5A
37V to 57V 76.0% DC859A
LTC4265 PoE+25.5W 37V to 57V – DC1415
LTC4269-1 PoE+25.5W 3.3V/6.6A 37V to 57V 89.0%*DC1335A-A
LTC4269-1 PoE+25.5W 5V/4.5A 37V to 57V 91.0%*DC1335B-B
LTC4269-1 PoE+25.5W 12V/2A 37V to 57V 90.8%*DC1335B-C
LTC4269-2 PoE+25.5W 5V/4.6A 37V to 57V 92.5%*DC1351B
LTC4278 PoE+25.5W 5V/4.5A 9V to 57V 89.0%*DC1561
LT4275C/LT4321 PoE 13W 37V to 57V 98.5% DC2093A-C
LT4275B/LT4321 PoE+25.5W 37V to 57V 98.9% DC2093A-B
LT4275A/LT4321 LTPoE++ 90W 37V to 57V 98.7% DC2093A-A
LT4275A/LT4321/LTM®8027 LTPoE++ 38.7W 12V/3A 37V to 57V 90.0% DC2125A
LT4276C/LT4321 PoE 13W 5V/2.3A 37V to 57V 90.0% DC2046A-F
LT4276B/LT4321 PoE+25.5W 3.3V/6.8A 37V to 57V 90.0% DC2046A-A
LT4276B/LT4321 PoE+25.5W 5V/4.7A 37V to 57V 92.0% DC2046A-B
LT4276B/LT4321 PoE+25.5W 12V/1.9A 37V to 57V 92.0% DC2046A-C
LT4276B/LT4321 PoE+25.5W 24V/1A 37V to 57V 92.0% DC2046A-D
LT4276A/LT4321 LTPoE++ 38.7W 5V/7A 37V to 57V 92.0% DC2046A-E
LT4276A/LT4321 LTPoE++ 70W 5V/13A 37V to 57V 92.5% DC2262A-A
LT4276A/LT4321 LTPoE++ 90W 12V/7A 37V to 57V 93.5% DC2262A-B
LT4276B/LT4321/LT4320 PoE+25.5W 12V/1.9A 9V to 57V 92.0% DC2047A-A
LT4295/LT4321 PoE++ 40W 12V/3A 37V to 57V 92.0% DC2475A-A
LT4295/LT4321 PoE++ 51W 12V/3.9A 37V to 57V 91.5% DC2539A-A
LT4295/LT4321 PoE++ 62W 24V/2.3A 37V to 57V 92.0% DC2476A-A
LT4295/LT4321 PoE++ 71.3W 24V/2.7A 37V to 57V 92.0% DC2476A-A
LT4295/LT4321 PoE++ 71.3W 12V/5.5V 37V to 57V 93.0% DC2584A-A
LT4294/LT4321 PoE++ 71.3W 37V to 57V 99.0% DC2583A
LT4293/LT4321 LTPoE++, PoE++ 90W 37V to 57V 99.2% DC2911A
*Not including diode bridge losses.

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