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
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2
C Accelerator Improved I
2
C 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
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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
2k
0.1µF
0.1µF
0.1µF
200Ω
200Ω
200Ω
200Ω
U2
U3
U1
HCPL-063L
HCPL-063L
V
DD
CPU
SCL
SDA
SMBALERT
GND CPU
D
DET
: CENTRAL SEMI CMPD3003
D
TSS
: DIODES INC SMAJ58A
L1: PULSE ENG PO473
Q1: FAIRCHILD IRFM120A
R
S
: VISHAY WSL2010 0.5Ω 0.5%
T1: PULSE ENG H2009
U1: FAIRCHILD NC7WZ17
U2, U3: AGILENT HCPL-063L
TO
CONTROLLER
PHY
(NETWORK
PHYSICAL
LAYER
CHIP)
D
TSS
58V
SMAJ58A
0.1µF
100V
X7R
V
EE
SENSE GATE OUT
V
DD
SCL
SDAIN
SDAOUT
INT
D
DET
CMPD3003
10k
0.1µF
L1
R
S
0.5Ω
Q1
IRFM120A
1/4
LTC4258
DGND AGND
DETECT
BYP
–48V
ISOLATED
ISOLATED
3.3V
ISOLATED
GND
0.01µF
200V
0.01µF
200V
0.01µF
200V
0.01µF
200V
75Ω75Ω
75Ω75Ω
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
