Datasheet

LTC4274A/LTC4274C
30
4274acfc
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0812 REV C • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC4270/LTC4271 12-Port PoE/PoE
+
/LTPoE
++
PSE Controller Transformer Isolation, Supports Type 1, Type 2 and LTPoE
++
PDs
LTC4266 Quad IEEE 802.3at PoE PSE Controller 2-Event Classification, Programmable I
CUT
/I
LIM
LTC4266A/LTC4266C Quad IEEE 802.3at PoE PSE Controller 13W through 90W Support
LTC4274 Single IEEE 802.3at PoE PSE Controller 2-Event Classification, Programmable I
CUT
/I
LIM
LTC4265 IEEE 802.3at PD Interface Controller 100V, 1A Internal Switch, 2-Event Classification Recognition
LTC4267 IEEE 802.3af PD Interface with Integrated Switching
Regulator
Internal 100V, 400mA Switch, Dual Inrush Current,
Programmable Class
LTC4269-1 IEEE 802.3at PD Interface with Integrated Flyback
Switching Regulator
2-Event Classification, Programmable Classification, Synchronous
No-Opto Flyback Controller, 50kHz to 250kHz, Auxiliary Support
LTC4269-2 IEEE 802.3at PD Interface with Integrated Forward
Switching Regulator
2-Event Classification, Programmable Classification, Synchronous
Forward Controller, 100kHz to 500kHz, Auxiliary Support
LTC4278 IEEE 802.3at PD Interface with Integrated Flyback
Switching Regulator
2-Event Classification, Programmable Classification, Synchronous
No-Opto Flyback Controller, 50kHz to 250kHz, 12V Auxiliary Support
One Complete Isolated Powered Ethernet Port
TYPICAL APPLICATION
4274AC TA02
1
2
3
4
5
6
7
8
2k
2k
1µF
100V
X7R
0.1µF
0.1µF
200
200
200
200
U2
U3
U1
HCPL-063L
HCPL-063L
V
DD
CPU
SCL
SDA
GND CPU
SMBALERT
TO
CONTROLLER
PHY
(NETWORK
PHYSICAL
LAYER
CHIP)
0.22µF
100V
X7R
V
EE
SENSE GATE OUT
V
DD
SCL
SDAIN
SDAOUT
INT
R
SENSE
0.25
Q1
T1
L
TC4274A/
LTC4274C
DGND AGND
ISOLATED
–54V
SMAJ58A
S1B
ISOLATED
3.3V
ISOLATED
GND
0.01µF
200V
0.01µF
200V
0.01µF
200V
0.01µF
200V
7575
7575
RJ45
CONNECTOR
1000pF
2000V
s
s
s
s
ss ss
s
s
s
s
FB1
FB2
S1B