Electrical characteristics (continued) – Rainbow Electronics MAX5971А User Manual
Page 3
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MAX5971A
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
ELECTRICAL CHARACTERISTICS (continued)
(V
AGND
- V
EE
= 32V to 60V, T
A
= -40NC to +85NC, all voltages are referenced to V
EE
, unless otherwise noted. Typical values are at
V
AGND
- V
EE
= +54V, T
A
= +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OVERCURRENT
Overcurrent Threshold
I
CUT
Overcurrent
threshold
allowed for
t P t
FAULT
,
V
OUT
= 0V
(Note 3)
Class 0, 1, 2, 3
351
370
389
mA
Class 4
602
634
666
Class 5 if ILIM1 = V
EE
,
ILIM2 = unconnected
710
748
785
Class 5 if ILIM1 =
unconnected, ILIM2 = V
EE
752
792
832
Class 5 if ILIM1 = V
EE
,
ILIM2 = V
EE
794
836
878
INTERNAL POWER
DMOS On-Resistance
R
DS(ON)
Measured
from OUT to
V
EE
, I
OUT
=
100mA
T
A
= +25NC
0.5
0.9
I
T
A
= +85NC
0.6
1.3
Power-Off OUT Leakage Current I
OUT_LEAK
V
EN
= V
EE
, V
OUT
= V
AGND
10
F
A
SUPPLY MONITORS
V
EE
Undervoltage Lockout
V
EE_UVLO
V
AGND
- V
EE
, V
AGND
increasing
28.5
V
V
EE
Undervoltage Lockout
Hysteresis
V
EE_UVLOH
Port is shutdown if: V
AGND
- V
EE
< V
EE_
UVLO
- V
EE_UVLOH
3
V
V
EE
Overvoltage Lockout
V
EE_OV
V
AGND
- V
EE
> V
EE_OV
, V
AGND
increasing
62.5
V
V
EE
Overvoltage Lockout
Hysteresis
V
EE_OVH
1
V
Thermal Shutdown Threshold
T
SHD
Port is shutdown and device resets if the
junction temperature exceeds this limit,
temperature increasing
150
N
C
Thermal Shutdown Hysteresis
T
SHDH
Temperature decreasing
20
N
C
OUTPUT MONITOR
OUT Input Current
I
BOUT
V
OUT
= V
AGND
, probing phases
6
F
A
Idle Pullup Current at OUT
I
DIS
OUTP discharge current, detection and
classification off, port shutdown,
V
OUTP
= V
AGND
- 2.8V
200
265
F
A
Short to V
EE
Detection
Threshold
DCN
TH
V
OUT
- V
EE,
V
OUT
decreasing, enabled
during detection
1.5
2.0
2.5
V
Short to V
EE
Detection
Threshold Hysteresis
DCN
HY
220
mV
LOAD DISCONNECT
DC Load-Disconnect Threshold
I
DCTH
Minimum load current allowed before dis-
connect (DC disconnect active),
V
OUT
= 0V
5
7.5
10
mA
AC Load-Disconnect Threshold
I
ACTH
Current into DET, for I
DET
< I
ACTH
the
port powers off (AC disconnect active)
115
130
145
F
A