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LTC4274
3
4274fd
 ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main PoE Supply Voltage
AGND
 
 V
EE
 
For IEEE Type 1 Complaint Output
For IEEE Type 2 Complaint Output
l
l
45
51
57
57
V
V
Undervoltage Lock-out Level
l
20
25
30
V
V
DD
V
DD
 Supply Voltage
V
DD
 DGND
l
3.0
3.3
4.3
V
Undervoltage Lock-out
l
2.2
V
Allowable Digital Ground Offset
DGND
 
 V
EE
l
25
57
V
I
EE
V
EE
 Supply Current
(AGND
 
 V
EE
) = 55V
l
2.4
5
mA
I
DD
V
DD
 Supply Current
(V
DD
 DGND) = 3.3V
l
1.1
3
mA
Detection
Detection Current  Force Current
First Point, AGND
 
 V
OUT
 = 9V
Second Point, AGND
 
 V
OUT
 = 3.5V
l
l
220
140
240
160
260
180
糀
糀
Detection Voltage  Force Voltage
AGND
 
 V
OUT
, 5糀 d I
OUT
 d 500糀
First Point
Second Point
l
l
7
3
8
4
9
5
V
V
Detection Current Compliance
AGND
 
 V
OUT
 = 0V
l
0.8
0.9
mA
V
OC
Detection Voltage Compliance
AGND
 
 V
OUT
, Open Port
l
10.4
12
V
Detection Voltage Slew Rate
AGND
 
 V
OUT
, C
PORT
 = 0.15糉
l
0.01
V/約
Min. Valid Signature Resistance
l
15.5
17
18.5
k?/DIV>
Max. Valid Signature Resistance
l
27.5
29.7
32
k?/DIV>
Classification
V
CLASS
Classification Voltage
AGND
 
 V
OUT
, 0mA d I
CLASS
d 50mA
l
16.0
20.5
V
Classification Current Compliance
V
OUT
 = AGND
l
53
61
67
mA
Classification Threshold Current
Class 0  1
Class 1  2
Class 2  3
Class 3  4
Class 4  Overcurrent
l
l
l
l
l
5.5
13.5
21.5
31.5
45.2
6.5
14.5
23
33
48
7.5
15.5
24.5
34.9
50.8
mA
mA
mA
mA
mA
V
MARK
Classification Mark State Voltage
AGND
 
 V
OUT
, 0.1mA d I
CLASS
d 10mA
l
7.5
9
10
V
Mark State Current Compliance
V
OUT
 = AGND
l
53
61
67
mA
Gate Driver
GATE Pin Pull-Down Current
Port Off, V
GATE
 = V
EE
 + 5V
Port Off, V
GATE
 = V
EE
 + 1V
l
l
0.4
0.08
0.12
mA
mA
GATE Pin Fast Pull-Down Current
V
GATE
 = V
EE
+ 5V
30
mA
GATE Pin On Voltage
V
GATE
 V
EE
, I
GATE
= 1糀
l
8
12
14
V
Output Voltage Sense
V
PG
Power Good Threshold Voltage
V
OUT
 V
EE
l
2
2.4
2.8
V
OUT Pin Pull-Up Resistance to AGND
0V d (AGND
 
 V
OUT
) d 5V
l
300
500
700
k?/DIV>
 
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25癈. AGND  V
EE
 = 54V, AGND = DGND, and V
DD
  DGND = 3.3V unless
otherwise noted. (Notes 3, 4)
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