MAX5922AEUI MAXIM [Maxim Integrated Products], MAX5922AEUI Datasheet - Page 4

• Manufacturer Part Number: MAX5922AEUI
• Description: +48V, Single-Port Network Power Switch For Power-Over-LAN
• Manufacturer: MAXIM [Maxim Integrated Products]

ELECTRICAL CHARACTERISTICS (continued)
(V
= 18.2kΩ ±1%, T
+48V, Single-Port Network Power Switch
For Power-Over-LAN
Note 1: All specifications are 100% production tested at T
Note 2: This is the time from an output overcurrent or short-circuit condition until the output goes into regulated current limit.
Note 3: OUT voltage above which the output current limit is at its full value (see Figure 8).
Note 4: To be consistent with the IEEE 802.3af standard, choose R
Note 5: This is the time the part stays in current-limit mode during overload condition. After t
Note 6: See the Typical Operating Characteristics and Figure 6.
Note 7: This is the delay from I
Note 8: See the Fault Management section.
Note 9: PD is detected by the procedures specified by the IEEE 802.3af standard. A probe voltage V
4
PD DETECTION (See Figure 3, PD Detection Section)
Detection Probe Voltage Phase I
Detection Probe Voltage Phase II
Detection Short-Circuit Current
Valid PD Detected Lower-Limit
Threshold
Valid PD Detected Upper-Limit
Threshold
Total Detection Time
Reject Capacitance During
Detection
Allowable Capacitance During
Detection
PD CLASSIFICATION (See PD Classification Mode Section)
Classification Probe Voltage
Classification Short-Circuit
Current
Classification Time Duration
Total Detection and Classification
Delay Time
Class 0 to Class 1 Threshold
Class 1 to Class 2 Threshold
Class 2 to Class 3 Threshold
Class 3 to Class 4 Threshold
Default To Class 0 High-Current
Lower-Limit Threshold
Collision Detection Delay Time
(MAX5922A/MAX5922C Only)
IN
_______________________________________________________________________________________
= 48V, V
design.
hits +150°C) the part shuts down.
Detection section).
and the current I
t
DET
PARAMETER
DIG
/ 2 again. The voltage increment is then divided by the difference of the two currents (I
A
= 3.3V, AGND_S = AGND = DGND = 0V, R
= -40°C to +85°C, unless otherwise noted. Typical values are at T
S1
is measured after t
OUT
falling below the zero-current threshold until ZC goes low and the IC shuts down (see the Zero-Current
I
I
I
I
I
I
SYMBOL
CLASS_1-2
CLASS_2-3
CLASS_3-4
CLASS_4-0
SC_CLASS
CLASS_1L
I
V
SC_DET
t
C
R
C
CLASS
V
R
CLASS
t
V
t
t
DCA
TOT
PDH
PDH
PBII
PDL
det
PDL
PBI
DET
/2. A second probe voltage V
R
R
OUT shorted to AGND
(Note 9)
(Note 9)
R
R
I
No load
Shorted to AGND
From detection completion
From channel-enabled to power delivered
at the OUT pin
DCA = high, R
OUT
PD
PD
PD
PD
= 19kΩ to 26.5kΩ
= 19kΩ to 26.5kΩ
= 19kΩ to 26.5kΩ
= 19kΩ to 26.5kΩ
= 0.5mA to 45mA
A
= +25°C, unless otherwise noted. All temperature limits are guaranteed by
SENSE
PD
CONDITIONS
SENSE
= 15kΩ
= 0.5Ω ±1%, UVLO = open, EN = V
= 0.5Ω ±1%.
PBII
(+8V typically) is then forced and I
A
= +25°C.) (Note 1)
OC
elapses (or when the junction temperature
S2
MIN
0.68
26.5
2.38
3.6
7.2
5.5
PBI
15
15
48
15
13
21
31
43
6
- I
S1
(+4V typically) is forced at OUT
). This is the PD resistance value.
DIG
TYP
21.3
14.5
46.5
, R
170
191
6.5
2.8
23
33
4
8
RCL
= 150Ω ±1%, R
S2
MAX
1.50
33.0
3.22
196
230
measured after
4.4
8.8
0.6
7.5
20
26
25
35
19
28
65
16
UNITS
mA
mA
mA
mA
mA
mA
mA
ms
ms
ms
kΩ
kΩ
µF
µF
V
V
V
s
RDT