LTC4290/LTC4271
32
429071fb
For more information www.linear.com/LTC4290
LINEAR TECHNOLOGY CORPORATION 2012
LT 0715 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC4290
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC4257-1 IEEE 802.3af PD Interface Controller Internal 100V, 400mA Switch, Dual Current Limit, Programmable Class
LTC4263 Single IEEE 802.3af PSE Controller Internal FET Switch
LTC4265 IEEE 802.3at PD Interface Controller Internal 100V, 1A Switch, 2-Event Classification Recognition
LTC4266 Quad IEEE 802.3at PoE PSE Controller With Programmable I
CUT
/I
LIM
, 2-Event Classification, and Port Current and Voltage Monitoring
LTC4267 IEEE 802.3af PD Interface With Integrated
Switching Regulator
Internal 100V, 400mA Switch, Dual Inrush Current, Programmable Class
LTC4267-1 IEEE 802.3af PD Interface With Integrated
Switching Regulator
Internal 100V, 400mA Switch, Programmable Class, 200kHz Constant Frequency PWM
LTC4267-3 IEEE 802.3af PD Interface With Integrated
Switching Regulator
Internal 100V, 400mA Switch, Programmable Class, 300kHz Constant Frequency PWM
LTC4269-1 IEEE 802.3af PD Interface With Integrated
Flyback Switching Regulator
2-Event Classification, Programmable Class, Synchronous No-Opto Flyback Controller,
50kHz to 250kHz, Aux Support
LTC4269-2 IEEE 802.3af PD Interface With Integrated
Forward Switching Regulator
2-Event Classification, Programmable Class, Synchronous Forward Controller, 100kHz to
500kHz, Aux Support
LTC4270/
LTC4271
12-Port PoE/PoE
+
/LTPoE
++™
PSE
Controller
Transformer Isolation, Supports Type 1, Type 2 and LTPoE
++
PDs
LTC4274 Single IEEE 802.3at PoE PSE Controller With Programmable I
CUT
/I
LIM
, 2-Event Classification, and Port Current and Voltage Monitoring
LT4275 PoE/PoE
+
/LTPoE
++
PD Controller External MOSFET, Programmable Class, –40°C to 125°C Operation
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
LTC4311 SMBus/ I
2
C Accelerator Improved I
2
C Rise Time, Ensures Data Integrity
TYPICAL APPLICATION
Complete 8-Port PSE
0.01µF
200V
0.01µF
200V
1
2
3
4
5
6
7
8
RJ45
CONNECTOR
••
3.3V –54V
100Ω
100Ω
T2
T3
••
3.3V –54V
–54V
ISOLATED
ISOLATED
GND
–54V
100Ω
100Ω
GP0
GP1
MID
RESET
MSD
INT
AUTO
SCL
AD0
AD1
AD2
AD3
AD6
DGND
V
EE
VSSK
CAP1
CAP2
DND
DPD
CND
CPD
DNA
AGND
DPA
CNA
CPA
OUT8
OUT1
GATE1
SENSE1
GATE8
SENSE8
XIO0 XIO1
429071 TA03
SDAIN
SDAOUT
LTC4271 LTC4290
V
DD33
1µF
3.3V 0.1µF 1µF
1µF
2nF 2000V
1µF
100V
X7R
0.1µF
+
>47µF
SYSTEM
BULK CAP
S1B
1
7
8
2
T1
0.25Ω, 1%
RS
0.22µF
100V
X7R
S1B
FDMC3612
•
•
••
•
•
•
•
••
•
•
0.01µF
200V
0.01µF
200V
0.01µF
200V
0.01µF
200V
75Ω75Ω
75Ω75Ω
1
2
3
4
5
6
7
8
RJ45
CONNECTOR
PHY
(NETWORK
PHYSICAL
LAYER
CHIP)
SMCJ58A
10Ω
SMAJ-
58A
