Datasheet

LTC4274
28
4274fd
RELATED PARTS
© LINEAR TECHNOLOGY CORPORATION 2009
LT 0112 REV D • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1619 Low Voltage Current Mode PWM Controller –48V to 3.3V at 300mA, MSOP Package
LTC4265 IEEE 802.3at PD Interface Controller 100V, 1A Internal Switch, 2-Event Classification Recognition
LTC4266 IEEE 802.3at Quad PSE Controller Supports IEEE 802.3at Type 1 and 2 PDs, 0.34 Channel Resistance, Advanced Power
Management, High-Reliability 4-Point PD Detection, Legacy Capacitance Detect
LTC4267 IEEE 802.3af PD Interface Console with
Integrated Switching Regulator
Internal 100V, 400mA Switch, Dual Inrush Current, Programmable Class
LTC4269-1 IEEE 802.3at PD Interface Console with
Integrated Switching Regulator
2-Event Classification, Programmable Classification, Synchronous No-Opto Flyback
Controller, 50kHz to 250kHz, Auxiliary Support
LTC4269-2 IEEE 802.3at PD Interface Console with
Integrated Switching Regulator
2-Event Classification, Programmable Classification, Synchronous Forward Controller,
100kHz to 500kHz, Auxiliary Support
LTC4278 IEEE 802.3at PD Interface with Integrated
Switching Regulator
2-Event Classification, Programmable Classification, Synchronous No-Opto Flyback
Controller, 50kHz to 250kHz, 12V Auxiliary Support
LTC4270/
LTC4271
12-Port PoE/PoE
+
/LTPoE
++
™ PSE Controller Transformer Isolation, Supports Type 1, Type 2 and LTPoE
++
PDs
One Complete Isolated Powered Ethernet Port
4274 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
TC4274
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