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MAX5986AMAX5986C/MAX5987A
IEEE 802.3af-Compliant, High-Efficiency, Class 1/
Class 2, PDs with Integrated DC-DC Converter
  3
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
 = 48V, R
SIG
 = 24.9k? LED, V
CC
, SL, ULP, WK, RESET, LDO_OUT unconnected, WAD = LDO_EN = LDO_IN = PGND =
GND, C1 = 68nF, C2 = 10礔, C3 = 1礔 (see Figure 3), V
FB
 = V
AUX
 = 0V, LX unconnected. V
CLASS2
 = 0V, V
MPS
 = 0V (except for
MAX5986A). All voltages are referenced to GND, unless otherwise noted. T
A
 = T
J
 = -40癈 to +85癈, unless otherwise noted. Typical
values are at T
A
 = +25癈.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
 Turn-On Voltage
V
ON
V
DD
 rising
MAX5986A/B/C
34.3
35.7
37.6
V
MAX5987A
37.2
38.7
40
V
DD
 Turn-Off Voltage
V
OFF
V
DD
 falling
30
31.4
V
V
DD
 Turn-On/Off Hysteresis
V
HYST_UVLO
(Note 6)
MAX5986A/B/C
3.4
4.2
V
MAX5987A
7.2
V
DD
 Deglitch Time
t
OFF_DLY
V
DD
 falling from
40V to 20V
(Note 5)
MAX5986A
116
Fs
MAX5986B/C/
MAX5987A
150
Inrush to Operating Mode Delay
t
DELAY
t
DELAY
 = time from
a (V
DD
 - V
CC
) 1.5V
to 0V
MAX5986A
90
ms
MAX5986B/C/
MAX5987A
123
Isolation Power MOSFET
On-Resistance
R
ON_ISO
I
VCC
 = 100mA
T
J
 = +25NC
1.2
I
T
J
 = +85NC
1.5
MAINTAIN POWER SIGNATURE (MPS = VDRV)
PoE MPS Current Rising Threshold    I
MPS_RISE
MAX5986B/MAX5986C/MAX5987A only
18
28.7
40
mA
PoE MPS Current Falling
Threshold
I
MPS_FALL
MAX5986B/MAX5986C/MAX5987A only
14
24
35
mA
PoE MPS Current Threshold
Hysteresis
I
MPS_HYS
MAX5986B/MAX5986C/MAX5987A only
4.3
mA
PoE MPS Output Average Current
I
MPS_AVE
MAX5986B/MAX5986C/MAX5987A only
4.8
mA
PoE MPS Peak Output Current
I
MPS_PEAK
MAX5986B/MAX5986C/MAX5987A only
10
12.6
mA
PoE MPS Time High
t
MPS_HIGH
MAX5986B/MAX5986C/MAX5987A only
95
ms
PoE MPS Time Low
t
MPS_LOW
MAX5986B/MAX5986C/MAX5987A only
190
ms
CURRENT LIMIT
Inrush Current Limit
I
INRUSH
During initial turn-on period,
V
DD
 - V
CC
 = 4V, measured at V
CC
39
49
60
mA
Current Limit During Normal
Operation
I
LIM
After inrush completed,
V
CC
 = V
DD
 1.5V,
measured at V
CC
MAX5986A
175
201
226
mA
MAX5986B/C/
MAX5987A
290
323
360
WAD Detection Rising Threshold
V
WAD_RISE
(Note 9)
8.8
V
WAD Detection Falling Threshold
V
WAD_FALL
(Note 9)
5.8
V
WAD Detection Hysteresis
0.6
V
WAD Input Current
I
WAD
V
WAD
 = 24V
125
FA
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