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LTC4264IDE Datasheet(PDF) 17 Page - Linear Technology

Part # LTC4264IDE
Description  High Power PD Interface Controller with 750mA Current Limit
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4264IDE Datasheet(HTML) 17 Page - Linear Technology

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LTC4264
17
4264f
RX –
6
RX +
3
TX –
2
TX +
RJ45
T1
1
7
8
5
4
SPARE –
+
–
SPARE+
ISOLATED
WALL
TRANSFORMER
TO PHY
GND
OPTION 1: AUXILIARY POWER INSERTED BEFORE LTC4264
OPTION 2: AUXILIARY POWER INSERTED AFTER LTC4264 WITH SIGNATURE DISABLED
VIN
VOUT
VWW
VWW
VWW
D8
S1B
D3
SMAJ58A
TVS
C1
• 42V
≤ VWW ≤ 57V
• NO POWER PRIORITY ISSUES
• LTC4264 CURRENT LIMITS FOR BOTH PoE AND VWW
• 42V
≤ VWW ≤ 57V
• NO POWER PRIORITY ISSUES
• NO LTC4264 CURRENT LIMITS FOR VWW
• VWW ANY VOLTAGE BASED ON PD LOAD
• REQUIRES EXTRA DIODE
• SEE APPS REGARDING POWER PRIORITY
PD
LOAD
C14
0.1
µF
100V
RX –
6
RX +
3
TX –
2
TX +
RJ45
T1
1
7
8
5
4
SPARE –
+
–
SPARE+
ISOLATED
WALL
TRANSFORMER
TO PHY
GND
LTC4264
LTC4264
BR2
~
~
+
–
BR1
~
~
+
–
BR1
~
~
+
–
VIN
SHDN
BSS63
100k
100k
VOUT
D10
S1B
D3
SMAJ58A
TVS
C1
PD
LOAD
D9
S1B
OPTION 3: AUXILIARY POWER APPLIED TO LTC4264 AND PD LOAD
RX –
6
RX +
3
TX –
2
TX +
RJ45
T1
1
7
8
5
4
SPARE –
+
–
SPARE+
ISOLATED
WALL
TRANSFORMER
TO PHY
GND
LTC4264
VIN
VOUT
D10
S1B
D3
SMAJ58A
TVS
C1
PD
LOAD
C14
0.1
µF
100V
C14
0.1
µF
100V
BR2
~
~
+
–
BR1
~
~
+
–
OPTION 4: AUXILIARY POWER APPLIED TO ISOLATED LOAD
BR2
~
~
+
–
VWW
• VWW ANY VOLTAGE BASED ON PD LOAD
• SEE APPS REGARDING POWER PRIORITY
• BEST ISOLATION
RX –
6
RX +
3
TX –
2
TX +
RJ45
T1
1
7
8
5
4
SPARE –
+
–
SPARE+
ISOLATED
WALL
TRANSFORMER
TO PHY
GND
LTC4264
BR1
~
~
+
–
VIN
SHDN
VOUT
D3
SMAJ58A
TVS
C1
DRIVE
LOAD
C14
0.1
µF
100V
BR2
~
~
+
–
ISOLATED DC/DC CONVERTER
APPLICATIONS INFORMATION
Figure 10. Interfacing Auxiliary Power Source to the PD



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