MAX5940BESA+ Maxim Integrated Products, MAX5940BESA+ Datasheet - Page 11
![IC IEEE 802.3AF PD INTFC 8-SOIC](/photos/1/39/13902/8-soic_21-0042b_sml.jpg)
MAX5940BESA+
Manufacturer Part Number
MAX5940BESA+
Description
IC IEEE 802.3AF PD INTFC 8-SOIC
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5940BESA.pdf
(15 pages)
Specifications of MAX5940BESA+
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)
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Input Voltage
80V
Output Current
500mA
Supply Current
400µA
Digital Ic Case Style
SOIC
No. Of Pins
8
Uvlo
38.6V
Operating Temperature Range
-40°C To +85°C
Filter Terminals
SMD
Rohs Compliant
Yes
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
11