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LTC4270_15

更新时间： 2024-11-07 01:22:31
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凌特 - Linear /
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32页 403K
描述
12-Port PoE/PoE/LTPoE PSE Controller

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LTC4270_15 数据手册

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LTC4270/LTC4271  
++  
+
12-Port PoE/PoE /LTPoE  
PSE Controller  
FEATURES  
DESCRIPTION  
n
12 Independent PSE Channels  
The LTC®4270/LTC4271 chipset is a 12-port power sourc-  
ing equipment (PSE) controller designed for use in IEEE  
802.3at Type 1 and Type 2 (high power) compliant Power  
over Ethernet (PoE) systems. Transformer-isolated com-  
munication protocol replaces expensive opto-couplers  
and complex isolated 3.3V supply resulting in significant  
BOMcostsavings.TheLTC4270/LTC4271chipsetdelivers  
n
Compliant with IEEE 802.3at Type 1 and 2  
n
Chipset Provides Electrical Isolation  
n
Reduced BOM Cost  
n
Eliminates up to 6 High Speed Opto-Couplers  
n
Eliminates Isolated 3.3V Power Supply  
n
Low Power Dissipation  
n
0.25Ω Sense Resistance Per Channel  
lowest-in-industryheatdissipationbyutilizinglow-R  
external MOSFETs and 0.25Ω sense resistors.  
DS(ON)  
n
Very High Reliability 4-Point PD Detection  
n
2-Point Forced Voltage  
Advanced power management features include per-port  
12-bit current monitoring ADCs, DAC-programmable cur-  
rentlimit,andversatilefastshut-downofpreselectedports.  
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. Midspan PSEs  
are supported with 2-event classification and a 2 second  
n
2-Point Forced Current  
n
V
and V  
Monitoring  
EE  
PORT  
n
n
n
n
1 Second Rolling I  
Averaging  
PORT  
Supports 2-Pair and 4-Pair Output Power  
2
1MHz I C Compatible Serial Control Interface  
Available In Three Power Grades  
™
n
++  
A-Grade – LTPoE  
B-Grade – PoE 25.5W  
C-Grade – PoE 13W  
38.7W to 90W  
n
n
+
2
backoff timer. The LTC4270/LTC4271 includes an I C  
serial interface operable up to 1MHz.  
n
Available In 52-Lead 7mm × 8mm (LTC4270) and  
24-Lead 4mm × 4mm (LTC4271) QFN Packages  
The LTC4270/LTC4271 is available in multiple power  
grades allowing delivered PD power up to 90W.  
APPLICATIONS  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
++  
and LTPoE is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
n
PoE PSE Switches/Routers  
PoE PSE Midspans  
n
TYPICAL APPLICATION  
3.3V  
0.1µF  
V
DD33  
XIO0  
XIO1  
OUTn  
GP0  
GP1  
0.22µF  
100V  
LTC4270/LTC4271 FAMILY  
S1B  
PORTn  
NO ISOLATION  
REQUIRED ON  
I C INTERFACE  
CPD  
CPA  
MID  
MAX  
2
100Ω  
100Ω  
100Ω  
–54V  
RESET  
MSD  
AUTO  
INT  
•
•
•
LTC4270  
GRADE ISOLATION LTPoE  
DELIVERED  
+
PoE PoE POWER  
GATEn  
S1B  
–54V  
3.3V  
++  
0.25Ω  
100Ω  
SENSEn  
l
l
l
l
l
A
B
C
Transformer  
Transformer  
Transformer  
90W  
25.5W  
13W  
CND  
DPD  
CNA  
DPA  
LTC4271  
LTC4270  
SCL  
SDAIN  
SDAOUT  
0.22µF  
100V  
l
S1B  
100Ω  
100Ω  
100Ω  
•
PORT1  
OUT1  
3.3V  
–54V  
100Ω  
AD0  
AD1  
AD2  
AD3  
AD6  
S1B  
GATE1  
0.25Ω  
DND  
DNA  
–54V  
SENSE1  
VSSK  
10Ω  
V
EE  
AGND CAP2  
DGND  
CAP1  
1µF  
0.1µF  
+
>47µF  
SYSTEM  
1µF  
2nF 2kV  
BULK CAP  
–54V  
–54V  
42701fd  
42701 TA01a  
1
For more information www.linear.com/LTC4270  
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