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LTC4270BIUKG#PBF

更新时间： 2024-01-31 15:46:02
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凌特 - Linear 控制器
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32页 335K
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LTC4270/LTC4271  
++  
+
12-Port PoE/PoE /LTPoE  
PSE Controller  
FEATURES  
DESCRIPTION  
n
12 Independent PSE Channels  
TheLTC®4270/LTC4271chipsetisa12-PortPowerSourc-  
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  
Reduced BOM Cost  
Eliminates up to 6 High Speed Opto-Couplers  
Eliminates Isolated 3.3V Power Supply  
n
Low Power Dissipation  
0.25Ω Sense Resistance Per Channel  
Very High Reliability 4-Point PD Detection  
lowest-in-industryheatdissipationbyutilizinglow-R  
external MOSFETs and 0.25Ω sense resistors.  
DS(ON)  
n
2-Point Forced Voltage  
2-Point Forced Current  
Advancedpowermanagementfeaturesincludeper-port12-  
bit current monitoring ADCs, DAC-programmable current  
limit, and versatile fast shut-down 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. Midspan PSEs  
are supported with 2-event classification and a 2 second  
n
Temperature Monitoring  
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  
™
++  
A-Grade – LTPoE  
35W to 90W  
2
backofftimer.TheLTC4270/LTC4271includesanI Cserial  
+
B-Grade – PoE 25.5W  
C-Grade – PoE 13W  
interface operable up to 1MHz.  
n
TheLTC4270/LTC4271isavailableinmultiplepowergrades  
allowing delivered PD power up to 90W.  
Available In 52-Lead 7mm × 8mm (LTC4270)  
and 24-Lead 4mm × 4mm (LTC4271) QFN Packages  
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  
APPLICATIONS  
property of their respective owners.  
n
PoE PSE Switches/Routers  
n
PoE PSE Midspans  
TYPICAL APPLICATION  
3.3V  
0.1μF  
V
DD33  
XIO0  
XIO1  
OUTn  
GP0  
GP1  
0.22μF  
100V  
S1B  
PORTn  
NO ISOLATION  
REQUIRED ON  
I C INTERFACE  
CPD  
CPA  
LTC4270/LTC4271 FAMILY  
MID  
2
100Ω  
–54V  
100Ω t  
t
t
RESET  
MSD  
AUTO  
INT  
MAX  
GATEn  
S1B  
–54V  
3.3V  
LTC4270  
GRADE ISOLATION LTPoE  
DELIVERED  
0.25Ω  
100Ω  
100Ω  
++  
+
PoE PoE POWER  
SENSEn  
CND  
DPD  
CNA  
DPA  
LTC4271  
LTC4270  
SCL  
SDAIN  
SDAOUT  
l
l
l
l
l
A
B
C
Transformer  
Transformer  
Transformer  
90W  
25.5W  
13W  
0.22μF  
100V  
S1B  
100Ω  
100Ω t  
l
PORT1  
OUT1  
3.3V  
–54V  
100Ω  
AD0  
AD1  
AD2  
AD3  
AD6  
100Ω  
S1B  
GATE1  
0.25Ω  
DND  
DNA  
–54V  
SENSE1  
VSSK AGND  
V
DGND  
CAP1  
CAP2  
EE  
2nF 2kV  
1μF  
0.1μF  
+
>47μF  
SYSTEM  
BULK CAP  
1μF  
–54V  
–54V  
42701 TA01a  
42701f  
1
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