LTC4258
28
4258fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2004
LT/LWI REV B 1006 PRINTED IN USA
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1619
Low Voltage Current Mode PWM Controller
–48V to 3.3V at 300mA, MSOP Package
LTC1694
SMBus/I2C Accelerator
Improved I2C Rise Time, Ensures Data Integrity
LTC3803
Current Mode Flyback DC/DC Controller in ThinSOT
200kHz Constant Frequency, Adjustable Slope Compensation,
Optimized for High Input Voltage Applications
LTC4255
Quad Network Power Controller
Non-IEEE 802.3af Compliant Current Levels
LTC4257
IEEE 802.3af PD Interface Controller
100V 400mA Internal Switch, Programmable Classification
LTC4257-1
IEEE 802.3af PD Interface Controller
100V 400mA Internal Switch, Dual Current Limit
LTC4259A-1
Quad IEEE 802.3af Power Over Ethernet Controller
With AC Disconnect
LTC4267
IEEE802.3af PD Interface with Integrated Switching
100V, 400mA UVLO Switch, Dual Inrush Current, Programmable
Regulator
Classification
4258 F17
1
2
3
4
5
6
7
8
2k
0.1
F
0.1
F
0.1
F
200
200
200
200
U2
U3
U1
HCPL-063L
VDD CPU
SCL
SDA
SMBALERT
GND CPU
DDET: CENTRAL SEMI CMPD3003
DTSS: DIODES INC SMAJ58A
L1: PULSE ENG PO473
Q1: FAIRCHILD IRFM120A
RS: VISHAY WSL2010 0.5 0.5%
T1: PULSE ENG H2009
U1: FAIRCHILD NC7WZ17
U2, U3: AGILENT HCPL-063L
TO
CONTROLLER
PHY
(NETWORK
PHYSICAL
LAYER
CHIP)
DTSS
58V
SMAJ58A
0.1
F
100V
X7R
VEE
SENSE GATE OUT
VDD
SCL
SDAIN
SDAOUT
INT
DDET
CMPD3003
10k
0.1
F
L1
RS
0.5
Q1
IRFM120A
1/4
LTC4258
DGND AGND
DETECT
BYP
–48V
ISOLATED
3.3V
ISOLATED
GND
0.01
F
200V
0.01
F
200V
0.01
F
200V
0.01
F
200V
75
75
75
75
RJ45
CONNECTOR
1/2 PULSE
H2009
T1A
1:1
T1B
1:1
1000pF
2000V
Figure 19. One Complete Isolated Powered Ethernet Port
TYPICAL APPLICATIO
U