Linear Technology DC1814A-A LTC4274A-1: LTPoE++ (38.7W) PSE (req. DC2093) DC1814A-A DC1814A-A 数据表
产品代码
DC1814A-A
LTC4274A/LTC4274C
1
4274acfc
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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
Single PoE/PoE+/LTPoE++
PSE Controller
The LTC
®
4274A is a single 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 LTC4274A
feature set is a superset of the popular LTC4274. 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 LTC4274A
feature set is a superset of the popular LTC4274. 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 LTC4274C 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: a 14-bit
current monitoring ADC, DAC-programmable current limit,
and versatile quick port shutdown. PD Discovery uses
a proprietary dual-mode 4-point detection mechanism
ensuring excellent immunity from false PD detection.
The LTC4274A/LTC4274C includes an I
current monitoring ADC, DAC-programmable current limit,
and versatile quick port shutdown. PD Discovery uses
a proprietary dual-mode 4-point detection mechanism
ensuring excellent immunity from false PD detection.
The LTC4274A/LTC4274C includes an I
2
C serial interface
operable up to 1MHz.
The LTC4274A/LTC4274C is available in multiple power
grades, allowing 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.
grades, allowing 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.
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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
LTC4274A-1: LTPoE++™ 38.7W
LTC4274A-2: LTPoE++ 52.7W
LTC4274A-3: LTPoE++ 70W
LTC4274A-4: LTPoE++ 90W
LTC4274C: PoE 13W
LTC4274A-2: LTPoE++ 52.7W
LTC4274A-3: LTPoE++ 70W
LTC4274A-4: LTPoE++ 90W
LTC4274C: PoE 13W
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Available in 38-Lead 5mm × 7mm QFN Package
TYPICAL APPLICATION
Complete Single-Port Ethernet High Power Source
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
LTPoE++ are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
4274AC TA01
SCL
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
AGND
V
EE
SENSE
–54V
1μF
100V
100V
SMAJ58A
GATE
OUT
PORT
0.22μF
100V
100V
S1B
S1B
–54V
DGND
V
DD
INT
SHDN
AUTO
MSD
RESET
MID
0.1μF
3.3V
LTC4274A/LTC4274C