_______________________________________________________________________________________ 3
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
FA
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
NC
Thermal Shutdown Hysteresis T
SHDH
Temperature decreasing 20
NC
OUTPUT MONITOR
OUT Input Current I
BOUT
V
OUT
= V
AGND
, probing phases 6
FA
Idle Pullup Current at OUT I
DIS
OUTP discharge current, detection and
classification off, port shutdown,
V
OUTP
= V
AGND
- 2.8V
200 265
FA
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
FA
(26 Seiten)
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