LTC4270/LTC4271
TYPICAL APPLICATION
3.3V 0.1μF
1μF
12
11
GP0
V
DD33
XIO0
CPA
XIO1
2
GP1
CPD
MID
1
OUT12
GATE12
SENSE12
100Ω
3.3V
RESET
MSD
AUTO
INT
t
t
t
–54V
–54V
0.22μF
100V
X7R
100Ω
LTC4271
LTC4270
S1B
SCL
T2
CND
DPD
CNA
DPA
SDAIN
OUT1
GATE1
SENSE1
SDAOUT
AD0
AD1
AD2
AD3
AD6
100Ω
3.3V
t
RS
RJ45
CONNECTOR
100Ω
0.25Ω, 1% FDMC3612
T3
1
DND
DNA
AGND
RJ45
CONNECTOR
2
3
4
5
6
7
8
1μF
S1B
T1
0.01μF
V
VSSK
DGND CAP1
CAP2 EE
200V
1
1μF
100V
X7R
1μF
D
TSS
2
3
4
5
6
7
t
t
t
0.01μF
200V
0.01μF
200V
75Ω 75Ω
2nF 2000V
–54V
PHY
t
ISOLATED
0.01μF
200V
(NETWORK
PHYSICAL
LAYER
ISOLATED
GND
8
t
t
t
t
>47μF
SYSTEM
BULK CAP
0.01μF
200V
0.01μF
200V
+
CHIP)
75Ω 75Ω
–54V
42701 F16
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
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Quad IEEE 802.3at PoE PSE Controller
Internal 100V, 400mA Switch, Dual Current Limit, Programmable Class
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IEEE 802.3af PD Interface With Integrated
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50kHz to 250kHz, Aux Support
IEEE 802.3af PD Interface With Integrated
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2-Event Classification, Programmable Class, Synchronous Forward Controller, 100kHz to
500kHz, Aux Support
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Controller
With Programmable CUT/LIM, 2-Event Class, and Port Current and Voltage Monitoring
LTC4278
IEEE 802.3af PD Interface With Integrated
Flyback Switching Regulator
2-Event Classification, Programmable Class, Synchronous No-Opto Flyback Controller,
50kHz to 250kHz, 12V Aux Support
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LTC4311
Single IEEE 802.3at PoE PSE Controller
With Programmable CUT/LIM, 2-Event Classification, and Port Current and Voltage Monitoring
2
2
SMBus/ I C Accelerator
Improved I C Rise Time, Ensures Data Integrity
42701f
LT 0411 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
32
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
Linear [ Linear ]
