LTC4274
28
4274fe
For more information www.linear.com/LTC4274
RELATED PARTS
LINEAR TECHNOLOGY CORPORATION 2009
LT 0715 REV E • PRINTED IN USA
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, 0.34Ω 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
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC4274
4274 TA02
1
2
3
4
5
6
7
8
2k
2k
0.1µF
200Ω
200Ω
200Ω
200Ω
U2
U3
U1
HCPL-063L
HCPL-063L
V
DD
CPU
SCL
SDA
GND CPU
INTERRUPT
TO
CONTROLLER
PHY
(NETWORK
PHYSICAL
LAYER
CHIP)
V
EE
SENSE GATE OUT
DGND
SCL
SDAIN
SDAOUT
INT
AGND
R
SENSE
0.25Ω
Q1
T1
LTC4274
V
DD
ISOLATED
–54V
S1B
ISOLATED
3.3V
0.01µF
200V
0.01µF
200V
0.01µF
200V
0.01µF
200V
75Ω75Ω
75Ω75Ω
RJ45
CONNECTOR
1000pF
2000V
•
•
•
•
•• ••
•
•
•
•
FB1
FB2
Q1: FAIRCHILD IRFM120A OR PHILIPS PHT6NQ10T
U1: FAIRCHILD NC7WZ17
U2, U3: AGILENT HCPL-063L
FB1, FB2: TDK MPZ2012S601A
T1: PULSE H6096NL OR COILCRAFT ETH1-230LD
0.1µF
S1B
0.22µF
100V
X7R
C
BULK
TVS
BULK
SMAJ58A
10Ω
1µF
100V
X7R
0.1µF
SMAJ5.0A
10Ω
10µF
