LTC4267-3
34
42673fb
For more information www.linear.com/LTC4267-3
LINEAR TECHNOLOGY CORPORATION 2007
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/LTC4267-3
relaTeD parTs
Typical applicaTion
High-Efficiency Class 3 PD with 3.3V Isolated Power Supply
P
VCC
NGATE
SENSE
I
TH
/RUN
PWRGD
V
FB
V
PORTP
R
CLASS
SIGDISA
V
PORTN
LTC4267-3
45.3Ω
1%
220k
330Ω220k
10Ω
P
VCC
4.7µF
SMAJ58A
MMSD4148
PULSE
PA1136
MMSD4148
BAS516
BAS516
MMTBA42
–48V
FROM
DATA PAIR
–48V
FROM
SPARE PAIR
Si3440
2N7002
P
VCC
100k
P
VCC
6.8k
10k
10k
0.1µF
B1100
(8 PLACES)
P
OUT
PGND
9.1V
150pF
510Ω
500Ω
0.068Ω
1%
100k
1%
60.4k
1%
570µF*
33nF
•
•
•
10Ω
470pF
2200pF
2kV
PS2911
TLV431
SBM1040
3.3V
2.6A
CHASSIS
42673 TA04
*100µF CERAMIC + 470µF TANTALUM
BAS516
12µF
100V
2.2µF
100V
4.7µH
PART NUMBER DESCRIPTION COMMENTS
LTC4265 IEEE 802.3at High Power PD Interface Controller
with 2-Event Classification
2-Event Classification Recognition, 100mA Inrush Current, Single-Class Programming
Resistor, Full Compliance to 802.3at
LTC4267-1 IEEE 802.3af PD Interface with Integrated
Switching Regulator
Internal 100V, 400mA Switch, Programmable Class, 200kHz Constant Frequency PWM
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
LT4275A LTPoE
++
™ PD Controller Provides Up to 90W, External MOSFET for Lowest Power Dissipation and Highest
System Efficiency, 2-Event Classification, Programmable Classification
LT4275B IEEE 802.3at PD Controller External MOSFET for Lowest Power Dissipation and Highest System Efficiency,
2-Event Classification, Programmable Classification
LT4275C IEEE 802.3at PD Controller External MOSFET for Lowest Power Dissipation and Highest System Efficiency,
Programmable Classification
LTC4274 Single PoE PSE Controller Provides Up to 90W, 2-Event Classification, and Port Current and Voltage Monitoring
LTC4266 Quad PoE PSE Controller Provides Up to 90W, 2-Event Classification, and Port Current and Voltage Monitoring
