High-Power, Quad, PSE Controller
for Power-Over-Ethernet
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
AGND
= 32V to 60V, V
EE
= 0V, V
DD
to V
DGND
= +3.3V, all voltages are referenced to V
EE
, unless otherwise noted. Typical values are at
V
AGND
= +48V, V
DGND
= +48V, V
DD
= (V
DGND
+ 3.3V), T
A
= +25癈. Currents are positive when entering the pin and negative other-
wise.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS/OUTPUTS (Referred to DGND)
Digital Input Low
V
IL
0.9
V
Digital Input High
V
IH
2.4
V
Internal Input Pullup/Pulldown
Resistor
R
DIN
Pullup (pulldown) resistor to V
DD
(DGND) to
set default level
25
50
75
k&
O p
en- D r ai n O utp ut Low
V ol tag e
V
OL
I
SINK
= 15mA
0.4
V
Digital Input Leakage
I
DL
Input connected to the pull voltage
2
礎
Open-Drain Leakage
I
OL
Open-drain high impedance, V
O
= 3.3V
2
礎
TIMING
Startup Time
t
START
Time during which a current limit set by
V
SU_LIM
is allowed, starts when the GATE_ is
turned on (Note 5)
50
60
70
ms
Fault Time
t
FAULT
Maximum allowed time for an overcurrent
condition set by V
FLT_LIM
after startup (Note 5)
50
60
70
ms
Port Turn-Off Time
t
OFF
Minimum delay between any port turning off,
does not apply in case of a reset
0.5
ms
Detection Reset Time
Time allowed for the port voltage to reset
before detection starts
80
90
ms
Detection Time
t
DET
Maximum time allowed before detection is
completed
330
ms
M i d sp an M od e D
etecti on D el ay
t
DMID
2.0
2.4
s
Classification Time
t
CLASS
Time allowed for classification
19
23
ms
V
EEUVLO
Turn-On Delay
t
DLY
Time V
AGND
must be above the V
EEUVLO
thresholds before the device operates
2
4
ms
RSTR bits = 00
16 x
t
FAULT
RSTR bits = 01
32 x
t
FAULT
RSTR bits = 10
64 x
t
FAULT
Restart Timer
t
RESTART
Time a port has to wait
before turning on after an
overcurrent fault,
RSTR_EN_ bits = high
RSTR bits = 11
0
ms
Watchdog Clock Period
t
WD
Rate of decrement of the watchdog timer
164
ms
ADC PERFORMANCE
Resolution
9
Bits
Range
0.51
V
LSB Step Size
1
mV
Integral Nonlinearity (Relative)
INL
0.5
LSB
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