Datasheet

IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated 70W High-Power MOSFET
MAX5982A/MAX5982B/MAX5982C
_______________________________________________________________________________________ 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
POWER MODE
V
IN
Supply Voltage Range 60 V
V
IN
Supply Current I
Q
Current through internal MOSFET = 0 0.25 0.55 mA
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
90 96 102 ms
Isolation Power MOSFET
On-Resistance
R
ON_ISO
I
RTN
= 950mA
T
J
= +25NC 0.1 0.2
I
T
J
= +85NC 0.15 0.25
T
J
= +125NC 0.2
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 90 135 182 mA
Current Limit During Normal
Operation
I
LIM
After inrush completed,
V
RTN
= 1V (Note 9)
1700
1900 2100 mA
Current Limit in Foldback
Condition
I
LIM-FLDBK
Both during inrush and after inrush
completed V
RTN
= 7.5V
53 mA
Foldback Threshold V
RTN
(Note 10) 6.5 7.0 7.5 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
0.35 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 (MAX5982A/MAX5982B)
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
mAR
SL
= 30.2kI, V
LED
= 3.75V 19.5 20.9 22.5
R
SL
= 30.2kI, V
LED
= 4V 19