Linear Technology DC1815A-A LTC4266A-1: 4-Port 38.7W LTPoE++ Midspan PSE (req. DC2093 & DC590) DC1815A-A DC1815A-A 数据表
产品代码
DC1815A-A
LTC4266A/LTC4266C
1
4266acfc
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LTPoE++ PSE Switches/Routers
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LTPoE++ PSE Midspans
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IEEE 802.3at Type 1 PSE Switches/Routers
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IEEE 802.3at Type 1 PSE Midspans
APPLICATIONS
FEATURES
DESCRIPTION
Quad PoE/PoE+/LTPoE++
PSE Controller
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 R
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 R
ON
external MOSFETs and
0.25Ω sense resistors which are especially important at
the LTPoE++ current levels to maintain the lowest possible
heat dissipation.
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.
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 I
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 I
2
C serial interface operable up to 1MHz.
The LTC4266 is available in multiple power grades al-
lowing delivered PD power of 13W, 25W, 38.7W, 52.7W,
70W and 90W. These controllers are available in a 38-lead
5mm × 7mm QFN package.
lowing delivered PD power of 13W, 25W, 38.7W, 52.7W,
70W and 90W. These controllers are available in a 38-lead
5mm × 7mm QFN package.
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Four Independent PSE Channels
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Compliant with IEEE 802.3at Type 1 and 2
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Low Power Dissipation
0.25Ω Sense Resistance Per Channel
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Very High Reliability 4-Point PD Detection
2-Point Forced Voltage
2-Point Forced Current
2-Point Forced Current
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High Capacitance Legacy Device Detection
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1MHz I
2
C Compatible Serial Control Interface
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Midspan Backoff Timer
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Supports 2-Pair and 4-Pair Output Power
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Available in Multiple Power Grades
LTC4266A-1: LTPoE++™ 38.7W
LTC4266A-2: LTPoE++ 52.7W
LTC4266A-3: LTPoE++ 70W
LTC4266A-4: LTPoE++ 90W
LTC4266C: PoE 13W
LTC4266A-2: LTPoE++ 52.7W
LTC4266A-3: LTPoE++ 70W
LTC4266A-4: LTPoE++ 90W
LTC4266C: PoE 13W
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Available in 38-Lead 5mm × 7mm QFN Package
TYPICAL APPLICATION
Complete 4-Port Ethernet High Power Source
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.
LTPoE++ and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
4266 TA01
SCL
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
AGND V
EE
SENSE1
–50V
1μF
SMAJ58A
GATE1 OUT1
OUT2
OUT3
SENSE2 GATE2
SENSE3 GATE3
SENSE4 GATE4 OUT4
PORT1
–50V
0.22μF 100V
=4
S1B
=4
S1B
=4
PORT2
PORT3
PORT4
DGND
V
DD
INT
SHDN1 SHDN2
AUTO
MSD
RESET
SHDN3 SHDN4
MID
0.1μF
3.3V
LTC4266