![](http://datasheet.mmic.net.cn/Linear-Technology/LTC4259ACGW-TR_datasheet_98029/LTC4259ACGW-TR_32.png)
LTC4259A
32
4259afb
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 1205 REV B 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
LTC4255
Quad Network Power Controller
Non-IEEE 802.3af Compliant Current Levels
LTC4257
IEEE 802.3af PD Interface Controller
100V, 400mA Internal Switch, Programmable Class
LTC4257-1
IEEE 802.3af PD Interface Controller
100V, 400mA Internal Switch, Dual Current Limit, Programmable Class
LTC4258
Quad IEEE 802.3af Power Over Ethernet Controller
DC Disconnect Only
LTC4267
IEEE802.3af PD Interface with
100V, 400mA UVLO Switch, Dual Inrush Current, Programmable Class
Integrated Switching Regulator
4258 F22A
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
DAC: DIODES INC OR FAIRCHILD S1B
DDET: CENTRAL SEMI CMPD3003
DTSS: DIODES INC SMAJ58A
CDET: TDK C3225X7R2A474K
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
1
F
1k
VEE
SENSE GATE OUT
VDD
SCL
SDAIN
SDAOUT
INT
DDET
CMPD3003
10k
DAC
S1B
RDET
1k
0.1
F
100V
X7R
L1
CDET
0.47
F
100V
X7R
RS
0.5
Q1
IRFM120A
1/4
LTC4259A
DGND
OSCIN
AGND
DETECT
BYP
–48V
ISOLATED
3.3V
ISOLATED
GND
2VP-P, 100Hz
1.2V OFFSET
OSCILLATOR
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
T1
1:1
T1
1:1
1000pF
2000V
Figure 22. One Complete Isolated Powered Ethernet Port
TYPICAL APPLICATIO
U