IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
_______________________________________________________________________________________ 5
  Typical Operating Characteristics
(V
IN
 = (V
DD
 - V
SS
) = 54V, R
DET
 = 24.9k? R
CLS
 = 615? and R
SL
 = 60.4k? RTN, WAD, PG, 2EC, WK, and ULP unconnected; all
voltages are referenced to V
SS.
)
DETECTION CURRENT
vs. INPUT VOLTAGE
V
IN
 (V)
8
6
4
2
0.1
0.2
0.3
0.4
0.5
0
0
10
I
IN
 = I
VDD
 + I
DET
R
DET
 = 25.4kI
RTN = 2EC = PG = WAD = V
DD
-40癈 P T
A
  P +85NC
SIGNATURE RESISTANCE
vs. INPUT VOLTAGE
8
6
4
2
24.5
25.0
25.5
26.0
24.0
0
10
V
IN
 (V)
I
IN
 = I
VDD
 + I
DET
R
DET
 = 24.9kI
RTN = 2EC = PG = WAD = V
DD
T
A
 = -40NC
T
A
 = +85NC
T
A
 = +25NC
INPUT OFFSET CURRENT
vs. INPUT VOLTAGE
8
6
4
2
-2
0
2
4
-4
0
10
V
IN
 (V)
T
A
 = +85NC
T
A
 = -40NC
T
A
 = +25NC
CLASSIFICATION CURRENT vs.
INPUT VOLTAGE
V
IN
 (V)
25
20
15
10
5
10
20
30
40
50
60
70
0
0
30
CLASS 5
CLASS 4
CLASS 3
CLASS 2
CLASS 1
CLASS 0
CLASSIFICATION SETTLING TIME
MAX5981 toc05
V
IN
10V/div
I
IN
200mA/div
V
CLS
1V/div
100Fs/div
R
CLS
= 30.9I
2EC SINK CURRENT vs. 2EC VOLTAGE
V
2EC
 (V)
50
40
30
20
10
0.4
0.8
1.2
1.6
2.0
0
0
60
V
SS
 FLOATING
V
2EC
 REFERENCED TO RTN
V
WAD
 = 14V
T
A
 = -40NC
T
A
 = +85NC
T
A
 = +25NC
PG SINK CURRENT vs. PG VOLTAGE
V
PG
 (V)
50
40
30
20
10
100
150
200
250
300
50
0
60
T
A
 = -40NC
T
A
 = +85NC
T
A
 = +25NC
INRUSH CURRENT LIMIT
vs. RTN VOLTAGE
V
RTN
 (V)
50
40
30
20
10
70
90
110
130
150
50
0
60
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