MAX5945
Quad Network Power Controller
for Power-Over-LAN
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(AGND = +32V to +60V, V
EE
= 0V, V
DD
to DGND = +3.3V, all voltages are referenced to V
EE
, unless otherwise noted. Typical
values are at AGND = +48V, DGND = +48V, V
DD
= (DGND + 3.3V), T
A
= +25°C. Currents are positive when entering the pin and
negative otherwise.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AC Load Disconnect
Threshold (Note 4)
I
ACTH
Current into DET_, ACD_EN_ bit = high,
OSC_IN = 2.2V
300 325 350 µA
Oscillator Buffer Gain A
OSC
V
DET_
/ V
OSC_IN
, ACD_EN_ bit = high,
C
DET
= 400nF
2.92 2.98 3.04 V/V
OSC_IN Fail Threshold
(Note 5)
V
OS C _F AI L
Port will not power on if V
OSC_IN
< V
OSC_FAIL
and
ACD_EN_ bit = high
1.8 1.9 2.1 V
OSC_IN Input Resistance Z
OSC
OSC_IN input impedance when all the ACD_EN_
are active
100 kΩ
OSC_IN Input Capacitance C
OSC_IN
5pF
Load Disconnect Timer t
DISC
Time from V
SENSE
< V
DCTH
or current into DET_
< I
ACTH
to gate shutdown (Note 6)
300 400 ms
DETECTION
Detection Probe Voltage
(First Phase)
V
DPH1
V
AGND
- V
DET_
during the first detection phase 3.8 4 4.2 V
Detection Probe Voltage
(Second Phase)
V
DPH2
V
AGND
- V
DET_
during the second detection
phase
9.0 9.3 9.6 V
Current-Limit Protection I
DLIM
V
DET_
= V
AGND
, during detection, measure
current through DET_
1.5 1.75 2.0 mA
Short-Circuit Threshold V
DCP
If V
A GN D
- V
OU T
< V
D C P
after the fi r st d etecti on
p hase a shor t ci r cui t to AG N D i s d etected
1.62 V
Open-Circuit Threshold I
D_OPEN
First point measurement current threshold for
open condition
12.5 µA
Resistor Detection Window R
DOK
(Note 7) 18.6 26.5 kΩ
Detection rejects lower values 16
Resistor Rejection Window R
DBAD
Detection rejects higher values 30
kΩ
CLASSIFICATION
Classification Probe Voltage V
CL
V
AGND
- V
DET_
during classification 16 20 V
Current-Limit Protection I
ClLIM
V
DET_
= V
AGND
, during classification,
measure current through DET_
50 75 mA
Class 0, class 1 5.5 6.5 7.5
Class 1, class 2 13.5 14.5 15.5
Class 2, class 3 21.5 23 24.5
Class 3, class 4 31 33 35
Classification Current
Thresholds
I
CL
Classification current
thresholds between
classes
>Class 4 45 48 51
mA
DIGITAL INPUTS/OUTPUTS (REFERRED to DGND)
Digital Input Low V
IL
0.9 V
Digital Input High V
IH
2.4 V
(16 páginas)
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