Datasheet

IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
MAX5981A/MAX5981B
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= (V
DD
- V
SS
) = 48V, R
DET
= 24.9kω, R
CLS
= 615ω, and R
SL
= 60.4kω. RTN, WAD, PG, 2EC, WK, and ULP unconnected, all
voltages are referenced to V
SS,
unless otherwise noted. T
A
= T
J
= -40NC to +85NC, unless otherwise noted. Typical values are at
T
A
= +25NC.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
IN
Turn-On Voltage V
ON
V
IN
rising 34.3 35.4 36.6 V
V
IN
Turn-Off Voltage V
OFF
V
IN
falling 30 V
V
IN
Turn-On/-Off Hysteresis
V
HYST_
UVLO
(Note 7) 4.2 V
V
IN
Deglitch Time t
OFF_DLY
V
IN
falling from 40V to 20V (Note 8) 30 120
Fs
Inrush to Operating Mode
Delay
t
DELAY
t
DELAY
= minimum PG current pulse width
after entering into power mode
87 96 105 ms
Isolation Power MOSFET
On-Resistance
R
ON_ISO
I
RTN
= 600mA
T
J
= +25NC
0.5 0.7
IT
J
= +85NC
0.65 1
T
J
= +125NC
0.8
RTN Leakage Current I
RTN_LKG
V
RTN
= 12.5V to 30V 10
FA
CURRENT LIMIT
Inrush Current Limit I
INRUSH
During initial turn-on period,
V
RTN
= 1.5V
90 135 180 mA
Current Limit During Normal
Operation
I
LIM
After inrush completed,
V
RTN
= 1V
720 800 880 mA
Foldback Threshold V
RTN
(Note 9) 13 16.5 V
LOGIC
WAD Detection Threshold V
WAD-REF
V
WAD
rising, V
IN
= 14V to 48V (referenced
to RTN)
8 9 10 V
WAD Detection Threshold
Hysteresis
V
WAD
falling, V
RTN
= 0V, V
SS
unconnected
0.725 V
WAD Input Current I
WAD-LKG
V
WAD
= 10V (referenced to RTN) 3.5
FA
2EC Sink Current
V
2EC
= 3.5V (referenced to RTN), V
SS
disconnected
1 1.5 2.25 mA
2EC Off-Leakage Current
V
2EC
= 48V
1
FA
PG Sink Current
V
RTN
= 1.5V, V
PG
= 0.8V, during inrush
period
125 230 375
FA
PG Off-Leakage Current V
PG
= 60V 1
FA
SLEEP MODE
WK and ULP Logic Threshold
V
TH
V
WK
falling and V
ULP
rising and falling
1.5 3 V
SL Logic Threshold
Falling 0.75 0.8 0.85 V
SL Current
R
SL
= 0I
140
FA
LED Current Amplitude I
LED
R
SL
= 60.4kI, V
LED
= 3.5V
10 10.5 11.5
mA
R
SL
= 30.2kI, V
LED
= 3.75V
19.5 20.9 22.5
R
SL
= 30.2kI, V
LED
= 4V
19