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LTC4266A

更新时间： 2023-12-20 18:46:14
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
32页 380K
描述
四通道 PoE / PoE+ / LTPoE++ PSE 控制器

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中文翻译

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LTC4266A 数据手册

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LTC4266A/LTC4266C  
++  
+
Quad PoE/PoE /LTPoE  
PSE Controller  
FeAtures  
Description  
n
Four Independent PSE Channels  
The LTC®4266A is a quad power sourcing equipment (PSE)  
n
++  
controller capable of delivering up to 90W of LTPoE  
++  
Compliant with IEEE 802.3at Type 1 and 2  
n
power to a compatible LTPoE powered device (PD). A  
Low Power Dissipation  
n
proprietary detection/classification scheme allows mutual  
0.25Ω Sense Resistance Per Channel  
++  
++  
n
identification between a LTPoE PSE and LTPoE PD  
while remaining compatible and interoperable with exist-  
ing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A  
feature set is a superset of the popular LTC4266. These  
Very High Reliability 4-Point PD Detection  
n
2-Point Forced Voltage  
2-Point Forced Current  
n
n
n
n
n
n
High Capacitance Legacy Device Detection  
2
PSE controllers feature low R external MOSFETs and  
ON  
1MHz I C Compatible Serial Control Interface  
0.25Ω sense resistors which are especially important at  
Midspan Backoff Timer  
++  
the LTPoE current levels to maintain the lowest possible  
Supports 2-Pair and 4-Pair Output Power  
heat dissipation.  
Available in Multiple Power Grades  
n
++™  
++  
++  
LTC4266A-1: LTPoE  
38.7W  
The LTC4266C targets fully automatic PSE systems pow-  
ering Type 1 (up to 13W) PDs.  
n
n
n
n
LTC4266A-2: LTPoE 52.7W  
LTC4266A-3: LTPoE 70W  
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 excel-  
lent immunity from false PD detection. The LTC4266  
++  
LTC4266A-4: LTPoE 90W  
LTC4266C: PoE 13W  
n
Available in 38-Lead 5mm × 7mm QFN Package  
ApplicAtions  
n
++  
LTPoE PSE Switches/Routers  
2
includes an I C serial interface operable up to 1MHz.  
n
n
n
++  
LTPoE PSE Midspans  
IEEE 802.3at Type 1 PSE Switches/Routers  
IEEE 802.3at Type 1 PSE Midspans  
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.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
++  
LTPoE and ThinSOT are trademarks of Analog Devices, Inc. All other trademarks are the  
property of their respective owners.  
typicAl ApplicAtion  
Complete 4-Port Ethernet High Power Source  
10Ω  
AD0 AD1 AD2 AD3 SHDN1 SHDN2 SHDN3 SHDN4 AUTO MSD RESET MID SDAIN SCL  
3.3V  
V
DD  
0.1µF  
SDAOUT  
SMAJ5.0A  
10µF  
+
+
INT  
DGND  
AGND  
LTC4266  
0.22µF 100V  
S1B  
×4  
S1B  
×4  
10Ω  
×4  
–54V  
V
SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4  
EE  
SMAJ58A  
1µF  
C
BULK  
–54V  
100V  
TVS  
BULK  
PORT1  
PORT2  
PORT3  
PORT4  
4266AC TA01  
4266acfe  
1
For more information www.linear.com/LTC4266A  
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