MCZ34670EGR2 Freescale Semiconductor, MCZ34670EGR2 Datasheet - Page 13

• Manufacturer Part Number: MCZ34670EGR2
• Description: IC POE CURR MODE SW REG 20-SOIC
• Manufacturer: Freescale Semiconductor
• Type: Power Over Ethernet Controller (PoE)r

Specifications of MCZ34670EGR2

• Applications: Remote Peripherals (Industrial Controls, Cameras, Data Access)
• Internal Switch(s): No
• Voltage - Supply: 60V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Product: PoE / LAN Solutions
• Supply Voltage (max): 80 V
• Power Dissipation: 800 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Current: 4.5 mA
• Output Current: 2.1A
• Digital Ic Case Style: SOIC
• No. Of Pins: 20
• Duty Cycle (%): 48%
• Uvlo: 2V
• Frequency: 400kHz
• Msl: MSL 3 - 168 Hours
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCZ34670EGR2; MCZ34670EGR2TR

CLASSIFICATION
of classification is to provide a method for more efficient
power allocation through the PSE. The PD classification
allows the PSE to identify four different (power) classes
depending on the required power that the PD will draw during
normal operation. The classes and the corresponding
maximum power drawn by the PD is shown in
Table 6. PD Classes
PD CLASSES
the appropriate load current onto the line. The PSE measures
the load current and can determine the classification as
described in
.
Table 7. PD Class vs. Classification Current
Analog Integrated Circuit Device Data
Freescale Semiconductor
A PD may optionally be classified by the PSE. The intent
During classification probing by the PSE, the PD applies
Class
0
1
2
3
4
Class
0
1
2
3
4
Table
Classification Current [mA]
Min
17
26
36
0
9
7.
Reserved
Optional
Optional
Optional
Default
Usage
Max
12
20
30
44
4
Maximum Power
14.5 - 20.5 Volts
measured at PD
input connector
0.44 - 12.95
6.49 - 12.95
0.44 - 3.84
3.84 - 6.49
Table
Condition
[W]
—
6.
CLASSIFICATION SIGNATURE LOAD CURRENT
in
on the resistor R
flowing with the following relation:
PSE. The values for the R
appropriate class are listed in
Table 8. PD Class vs. Classification Resistor R
UVLO ADJUSTMENT
the IEEE 802.3af standard. Nevertheless the user can adjust
the UVLO by an external resistor divider as sketched in
Figure
Figure
The implementation for the classification circuitry is shown
A constant voltage is applied at pin RCLA and depending
I
The 34670 has default UVLO settings that corresponds to
I
CLASS
CLASS
Class
0
1
2
3
4
13. Since the UVLO resistor divider replaces the
-V
+V
PORT
12.
is the classification current that is measured by the
PORT
=
Figure 12. Classification Circuitry
-------------------- -
R
R
V
CLASS
CLASS
RCLA
I
CLASS
CLASS
Classification Current [mA]
, a current from +V
34670
RCLA
CLASS
V
FUNCTIONAL DEVICE OPERATION
ref
10.5
18.5
2.0
28
40
Table
+
-
resistor corresponding to the
EN
8.
OPERATIONAL MODES
VIN
PORT
VPWR
to -V
R
CLASS
CLASS
PORT
4.42k
475
261
169
113
34670
is
[Ω]
13