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Linear Technology Electronic Components Datasheet

LTC4266A Datasheet

Quad PoE/PoE+/LTPoE++ PSE Controller

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FEATURES
nn Four Independent PSE Channels
nn Compliant with IEEE 802.3at Type 1 and 2
nn Low Power Dissipation
nn 0.25Ω Sense Resistance Per Channel
nn Very High Reliability 4-Point PD Detection
nn 2-Point Forced Voltage
nn 2-Point Forced Current
nn High Capacitance Legacy Device Detection
nn 1MHz I2C Compatible Serial Control Interface
nn Midspan Backoff Timer
nn Supports 2-Pair and 4-Pair Output Power
nn Available in Multiple Power Grades
nn
nn
LTC4266A-1:
LTC4266A-2:
LLTTPPooEE++++52.378W.7W
nn LTC4266A-3: LTPoE++ 70W
nn LTC4266A-4: LTPoE++ 90W
nn LTC4266C: PoE 13W
nn Available in 38-Lead 5mm × 7mm QFN Package
APPLICATIONS
nn LTPoE++ PSE Switches/Routers
nn LTPoE++ PSE Midspans
nn IEEE 802.3at Type 1 PSE Switches/Routers
nn IEEE 802.3at Type 1 PSE Midspans
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
LTC4266A/LTC4266C
Quad PoE/PoE+/LTPoE++
PSE Controller
DESCRIPTION
The LTC®4266A is a quad power sourcing equipment (PSE)
controller capable of delivering up to 90W of LTPoE++
power to a compatible LTPoE++ powered device (PD). A
proprietary detection/classification scheme allows mutual
identification between a LTPoE++ PSE and LTPoE++ PD
while remaining compatible and interoperable with existing
Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A
feature set is a superset of the popular LTC4266. These
PSE controllers feature low RON external MOSFETs and
0.25Ω sense resistors which are especially important at
the LTPoE++ current levels to maintain the lowest possible
heat dissipation.
The LTC4266C targets fully automatic PSE systems power-
ing Type 1 (up to 13W) PDs.
Advanced power management features include: 14-bit
current monitoring ADCs, DAC-programmable current
limit, and versatile quick shutdown of preselected ports.
Advanced power management host software is available
under a no-cost license. PD discovery uses a proprietary
dual-mode 4-point detection mechanism ensuring excellent
immunity from false PD detection. The LTC4266 includes
an I2C serial interface operable up to 1MHz.
The LTC4266 is available in multiple power grades allow-
ing delivered PD power of 13W, 25.5W, 38.7W, 52.7W,
70W and 90W. These controllers are available in a 38-lead
5mm × 7mm QFN package.
TYPICAL APPLICATION
Complete 4-Port Ethernet High Power Source
3.3V 10Ω
+ SMAJ5.0A
10µF
10Ω
+
CBULK
–54V
SMAJ58A
TVSBULK
VDD AD0 AD1 AD2 AD3
0.1µF
DGND
SHDN1
SHDN2
SHDN3 SHDN4
LTC4266
AUTO MSD
RESET
MID SDAIN SCL
SDAOUT
INT
AGND
1µF
100V
VEE SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
0.22µF 100V
×4
S1B
×4
For more information www.linear.com/LTC4266A
S1B
×4
–54V
PORT1
PORT2
PORT3
PORT4
4266AC TA01
4266acfd
1


Linear Technology Electronic Components Datasheet

LTC4266A Datasheet

Quad PoE/PoE+/LTPoE++ PSE Controller

No Preview Available !

LTC4266A/LTC4266C
ABSOLUTE MAXIMUM RATINGS
Supply Voltages (Note 1)
AGND – VEE............................................ –0.3V to 80V
DGND – VEE............................................ –0.3V to 80V
VDD – DGND.......................................... –0.3V to 5.5V
Digital Pins
SCL, SDAIN, SDAOUT, INT, SHDNn, MSD, ADn,
RESET, AUTO, MID............ DGND –0.3V to VDD + 0.3V
Analog Pins
GATEn, SENSEn, OUTn........... VEE –0.3V to VEE + 80V
Operating Temperature Range
LTC4266I..............................................–40°C to 85°C
Junction Temperature (Note 2).............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
TOP VIEW
SDAOUT 1
NC 2
SDAIN 3
AD3 4
AD2 5
AD1 6
AD0 7
DNC 8
NC 9
DGND 10
NC 11
NC 12
38 37 36 35 34 33 32
VEE
39
13 14 15 16 17 18 19
31 GATE1
30 SENSE1
29 OUT2
28 GATE2
27 SENSE2
26 VEE
25 VEE
24 OUT3
23 GATE3
22 SENSE3
21 OUT4
20 GATE4
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
EXPOSED PAD IS VEE (PIN 39) MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 34°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
MAX PWR TEMPERATURE RANGE
LTC4266CIUHF#PBF LTC4266CIUHF#TRPBF 4266C
38-Lead (5mm × 7mm) Plastic QFN 13W
–40°C to 85°C
LTC4266AIUHF-1#PBF LTC4266AIUHF-1#TRPBF 4266A1
38-Lead (5mm × 7mm) Plastic QFN 38.7W
–40°C to 85°C
LTC4266AIUHF-2#PBF LTC4266AIUHF-2#TRPBF 4266A2
38-Lead (5mm × 7mm) Plastic QFN 52.7W
–40°C to 85°C
LTC4266AIUHF-3#PBF LTC4266AIUHF-3#TRPBF 4266A3
38-Lead (5mm × 7mm) Plastic QFN 70W
–40°C to 85°C
LTC4266AIUHF-4#PBF LTC4266AIUHF-4#TRPBF 4266A4
38-Lead (5mm × 7mm) Plastic QFN 90W
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
For more information www.linear.com/LTC4266A
4266acfd


Part Number LTC4266A
Description Quad PoE/PoE+/LTPoE++ PSE Controller
Maker Linear Technology
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LTC4266A Datasheet PDF






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