MAX5940CESA+ Maxim Integrated Products, MAX5940CESA+ Datasheet - Page 11

• Manufacturer Part Number: MAX5940CESA+
• Description: IC IEEE 802.3AF PD INTFC 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX5940CESA+

• Controller Type: Powered Device Interface Controller (PD)
• Interface: IEEE 802.3af
• Voltage - Supply: 48V
• Current - Supply: 1mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Diode D1 prevents the power-over-ethernet to back
drive the wall adapter. Whenever the wall adapter
power is greater than (V
Figure 5. Adding Wall Adapter Input Supply (Wall Adapter Supply Takes Precedence Over Power-Over-Ethernet)
-48V
GND
ADAPTER
SUPPLY
WALL
60V
25.5kΩ
R
68nF
______________________________________________________________________________________
DISC
GATE
V
EE
PS2701A-1
D3
D3
D1
R
IEEE 802.3af PD Interface Controller
CL
2.0kΩ
Application Circuit 2
+ approximately 2V), the
GATE
V
EE
1
2
3
4
GATE
RCLASS
UVLO
V
EE
CMPT3904
MAX5940B
MAX5940D
100kΩ
PGOOD
CMPT3904
PGOOD
PGOOD
Typical Application Circuits (continued)
GND
OUT
For Power-Over-Ethernet
8
7
6
5
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.
PGOOD
C
GATE
C
OUT
DC-DC CONVERTER
GND
V+
MAX5014
SS_SHDN
VREG
LOAD
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