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LTC42766C

更新时间： 2024-11-09 12:09:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
30页 755K
描述
Quad PoE/PoE/LTPoE PSE Controller

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中文翻译

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LTC42766C 数据手册

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LTC4266A/LTC4266C  
++  
+
Quad PoE/PoE /LTPoE  
PSE Controller  
FEATURES  
DESCRIPTION  
n
Four Independent PSE Channels  
TheLTC®4266Aisaquadpowersourcingequipment(PSE)  
++  
n
Compliant with IEEE 802.3at Type 1 and 2  
controller capable of delivering up to 90W of LTPoE  
n
++  
Low Power Dissipation  
power to a compatible LTPoE powered device (PD). A  
0.25Ω Sense Resistance Per Channel  
Very High Reliability 4-Point PD Detection  
proprietarydetection/classificationschemeallowsmutual  
n
++  
++  
identification between a LTPoE PSE and LTPoE PD  
whileremainingcompatibleandinteroperablewithexisting  
Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A  
feature set is a superset of the popular LTC4266. These  
2-Point Forced Voltage  
2-Point Forced Current  
n
High Capacitance Legacy Device Detection  
2
n
1MHz I C Compatible Serial Control Interface  
PSE controllers feature low R external MOSFETs and  
ON  
n
Midspan Backoff Timer  
0.25Ω sense resistors which are especially important at  
n
++  
Supports 2-Pair and 4-Pair Output Power  
theLTPoE currentlevelstomaintainthelowestpossible  
n
Available in Multiple Power Grades  
heat dissipation.  
++  
LTC4266A-1: LTPoE ™ 38.7W  
TheLTC4266CtargetsfullyautomaticPSEsystemspower-  
ing Type 1 (up to 13W) PDs.  
++  
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-mode4-pointdetectionmechanismensuringexcellent  
immunity from false PD detection. The LTC4266 includes  
LTC4266A-4: LTPoE 90W  
LTC4266C: PoE 13W  
n
Available in 38-Lead 5mm × 7mm QFN Package  
APPLICATIONS  
n
++  
LTPoE PSE Switches/Routers  
2
n
n
n
++  
LTPoE PSE Midspans  
an I C serial interface operable up to 1MHz.  
IEEE 802.3at Type 1 PSE Switches/Routers  
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.  
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.  
TYPICAL APPLICATION  
Complete 4-Port Ethernet High Power Source  
3.3V  
0.1μF  
SCL  
INT SHDN1 SHDN2 SHDN3 SHDN4  
V
AUTO MSD RESET MID  
DD  
SDAIN  
SDAOUT  
AD0  
0.22μF 100V  
S1B  
=4  
S1B  
=4  
LTC4266  
=4  
AD1  
–50V  
AD2  
AD3  
DGND AGND V SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4  
EE  
PORT1  
PORT2  
PORT3  
PORT4  
–50V  
SMAJ58A  
1μF  
4266 TA01  
4266acfc  
1
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