LTC4266A/LTC4266C
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Quad PoE/PoE /LTPoE
PSE Controller
Fe A Description
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Four Independent PSE Channels The LTC 4266A is a quad power sourcing equipment (PSE)
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Compliant with IEEE 802.3at Type 1 and 2 controller capable of delivering up to 90W of LTPoE
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power to a compatible LTPoE powered device (PD). A
Low Power Dissipation
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proprietary detection/classification scheme allows mutual
0.25 Sense Resistance Per Channel
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n identification between a LTPoE PSE and LTPoE PD
Very High Reliability 4-Point PD Detection
n while remaining compatible and interoperable with exist-
2-Point Forced Voltage
ing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A
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2-Point Forced Current
feature set is a superset of the popular LTC4266. These
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High Capacitance Legacy Device Detection
2 PSE controllers feature low R external MOSFETs and
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ON
1MHz I C Compatible Serial Control Interface
0.25 sense resistors which are especially important at
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Midspan Backoff Timer
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the LTPoE current levels to maintain the lowest possible
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Supports 2-Pair and 4-Pair Output Power
heat dissipation.
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Available in Multiple Power Grades
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LTC4266A-1: LTPoE 38.7W The LTC4266C targets fully automatic PSE systems pow-
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LTC4266A-2: LTPoE 52.7W ering Type 1 (up to 13W) PDs.
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LTC4266A-3: LTPoE 70W
Advanced power management features include: 14-bit
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LTC4266A-4: LTPoE 90W
current monitoring ADCs, DAC-programmable current
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LTC4266C: PoE 13W
limit, and versatile quick shutdown of preselected ports.
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Available in 38-Lead 5mm 7mm QFN Package
Advanced power management host software is available
under a no-cost license. PD discovery uses a proprietary
Applic A
dual-mode 4-point detection mechanism ensuring excel-
lent immunity from false PD detection. The LTC4266
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LTPoE PSE Switches/Routers
2
includes an I C serial interface operable up to 1MHz.
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LTPoE PSE Midspans
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IEEE 802.3at Type 1 PSE Switches/Routers
The LTC4266 is available in multiple power grades allow-
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IEEE 802.3at Type 1 PSE Midspans
ing delivered PD power of 13W, 25.5W, 38.7W, 52.7W,
70W and 90W. These controllers are available in a 38-lead
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
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LTPoE and ThinSOT are trademarks of Analog Devices, Inc. All other trademarks are the
5mm 7mm QFN package.
property of their respective owners.
t Al Applic A
Complete 4-Port Ethernet High Power Source
10
AD0 AD1 AD2 AD3 SHDN1 SHDN2 SHDN3 SHDN4 AUTO MSD RESET MID SDAIN SCL
3.3V V
DD
0.1F SDAOUT
SMAJ5.0A
+
INT
DGND
10F
LTC4266
0.22F 100V S1B S1B
10
4 4 4
AGND
54V
V SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
SMAJ58A EE
+
C 1F
BULK
100V
TVS
BULK
PORT1
54V
PORT2
PORT3
PORT4
4266AC TA01
4266acfe
1
For more information www.linear.com/LTC4266A
tion ypic
tions
turesLTC4266A/LTC4266C
Absolute M A Mu M rA
p in c F A
Supply Voltages (Note 1)
TOP VIEW
AGND V ........................................... 0.3V to 80V
EE
DGND V ........................................... 0.3V to 80V
EE
V DGND ......................................... 0.3V to 5.5V
DD
38 37 36 35 34 33 32
Digital Pins
SDAOUT 1 31 GATE1
SCL, SDAIN, SDAOUT, INT, SHDNn, MSD, ADn,
NC 2 30 SENSE1
RESET, AUTO, MID ........... DGND 0.3V to V + 0.3V
SDAIN OUT2
3 29
DD
AD3 GATE2
Analog Pins 4 28
AD2 5 27 SENSE2
GATEn, SENSEn, OUTn .......... V 0.3V to V + 80V
EE EE
AD1 6 26 V
EE
Operating Temperature Range
V
EE
AD0 7 25 V
39 EE
LTC4266I .............................................40C to 85C
DNC 8 24 OUT3
Junction Temperature (Note 2) ............................. 125C
NC GATE3
9 23
Storage Temperature Range .................. 65C to 150C
DGND 10 22 SENSE3
Lead Temperature (Soldering, 10 sec) ...................300C
NC 11 21 OUT4
NC 12 20 GATE4
13 14 15 16 17 18 19
UHF PACKAGE
38-LEAD (5mm 7mm) PLASTIC QFN
EXPOSED PAD IS V (PIN 39) MUST BE SOLDERED TO PCB
EE
T = 125C, = 34C/W
JMAX JA
o r Der i n F MA