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MAX5940DESA+

P1-P3P4-P6P7-P9P10-P12P13-P15
MAX5940A/MAX5940B/MAX5940C/MAX5940D
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
10 ______________________________________________________________________________________
R1*
60V
68nF
UVLO
GND
V
EE
GATE
RCLASS
PGOOD
PGOOD
DC-DC CONVERTER
PHY
GND
-48V
TX
RX
RJ-45
POWER-OVER
SPAIR PAIRS
3
6
1
2
4
5
7
8
GND
-48V
R2*
R
CL
*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOTAL 25.5kΩ AND REPLACE THE 25.5kΩ RESISTOR.
GND
V+
V
REG
OUT
1
2
3
4
5
6
7
8
C
OUT
C
GATE
R
DISC
25.5kΩ
SS_SHDN
MAX5014
MAX5940B
MAX5940D
POWER-OVER
SIGNAL PAIRS
LOAD
+
-
+
-
V
REG
Typical Application Circuits
Application Circuit 1
Figure 4. PD with Power-Over-Ethernet (Power is Provided by Either the Signal Pairs or the Spare Pairs)
MAX5940A/MAX5940B/MAX5940C/MAX5940D
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
______________________________________________________________________________________ 11
60V
68nF
UVLO
GND
V
EE
GATE
RCLASS
PGOOD
PGOOD
DC-DC CONVERTER
GND
-48V
WALL
ADAPTER
SUPPLY
R
CL
D1
GND
V+
VREG
PGOOD
OUT
1
2
3
4
5
6
7
8
C
OUT
C
GATE
R
DISC
25.5kΩ
SS_SHDN
MAX5014
MAX5940B
MAX5940D
LOAD
PGOOD
V
EE
GATE
V
EE
GATE
D3
PS2701A-1
CMPT3904
100kΩ
2.0kΩ
CMPT3904
Typical Application Circuits (continued)
Figure 5. Adding Wall Adapter Input Supply (Wall Adapter Supply Takes Precedence Over Power-Over-Ethernet)
Application Circuit 2
Diode D1 prevents the power-over-ethernet to back
drive the wall adapter. Whenever the wall adapter
power is greater than (V
D3
+ approximately 2V), the
GATE is pulled low to pinch off the power-over-ethernet.
The wall adapter power pollutes the discovery signa-
ture, preventing PSE from detecting this PD.
MAX5940A/MAX5940B/MAX5940C/MAX5940D
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
12 ______________________________________________________________________________________
60V
68nF
UVLO
GND
V
EE
GATE
RCLASS
PGOOD
PGOOD
DC-DC CONVERTER
GND
-48V
WALL
ADAPTER
SUPPLY
R
CL
D1
GND
V+
VREG
OUT
1
2
3
4
5
6
7
8
C
OUT
C
GATE
R
DISC
25.5kΩ
SS_SHDN
MAX5014
MAX5940B
MAX5940D
LOAD
R4
4kΩ
2W
D2
Typical Application Circuits (continued)
Figure 6. Adding Wall Adapter Input Supply (Wall Adapter Supply And Power-Over-Ethernet Co-Exist, the One with Higher Voltage
Provides Power To The Load)
Application Circuit 3
D2 prevents the wall adapter power from polluting the
discovery and classification signatures. The optional
R4 provides the 10mA minimum power maintenance
signature to keep the power-over-ethernet from discon-
necting.
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX5940DESA+

Mfr. #:
Buy MAX5940DESA+
Manufacturer:
Maxim Integrated
Description:
I/O Controller Interface IC IEEE 802.3af PD Int Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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