ltc4270 Linear Technology Corporation, ltc4270 Datasheet - Page 4

• Manufacturer Part Number: ltc4270
• Description: 12-port Poe/poe+/ltpoe++ Pse Controller
• Manufacturer: Linear Technology Corporation

LTC4270/LTC4271
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL PARAMETER
V
V
V
V
I
R
I
Detection
V
Classification
V
V
Gate Driver
Output Voltage Sense
V
4
EE
DD
EE
DD
CAP1
CAP2
OC
CLASS
MARK
PG
EE
Main PoE Supply Voltage
Undervoltage Lock-Out
V
Undervoltage Lock-Out
Internal Regulator Supply Voltage
Internal Regulator Supply Voltage
V
V
V
Detection Current – Forced Current
Detection Voltage – Forced Voltage
Detection Current Compliance
Detection Voltage Compliance
Detection Voltage Slew Rate
Min. Valid Signature Resistance
Max. Valid Signature Resistance
Classification Voltage
Classification Current Compliance
Classification Threshold Current
Classification Mark State Voltage
Mark State Current Compliance
GATE Pin Pull-Down Current
GATE Pin Fast Pull-Down Current
GATE Pin On Voltage
Power Good Threshold Voltage
OUT Pin Pull-Up Resistance to AGND
DD
EE
EE
DD
Supply Current
Supply Resistance
Supply Voltage
Supply Current
A
= 25°C. (Notes 3 & 4)
CONDITIONS
AGND – V
For IEEE Type 1 Compliant Output
For IEEE Type 2 Compliant Output
For LTPoE ++ Compliant Output
AGND – V
V
V
V
V
(AGND – V
V
(V
First Point, AGND – V
Second Point, AGND – V
AGND – V
First Point
Second Point
AGND – V
AGND – V
AGND – V
AGND – V
V
Class 0-1
Class 1-2
Class 2-3
Class 3-4
Class 4-Overcurrent
AGND – V
V
Port Off, V
Port Off, V
V
V
V
0V ≤ (AGND – V
DD
DD
CAP1
CAP2
EE
OUTn
OUTn
GATEn
GATEn
OUTn
DD
< 15V
– DGND
– DGND
The
– DGND) = 3.3V
– DGND
– V
= AGND
= AGND
– V
= V
– V
l
EE
EE
EE
EE
OUTn
OUTn
OUTn
OUTn
OUTn
OUTn
GATEn
GATEn
EE
EE
EE
denotes the specifications which apply over the full operating
, I
) = 55V
+ 5V
, 5μA ≤ I
, Open Port
, C
, 0mA ≤ I
, 0.1mA ≤ I
GATEn
= 0V
OUT
= V
= V
PORT
) ≤ 5V
EE
EE
= 1μA
OUTn
= 0.15μF
+ 5V
+ 1V
OUTn
OUTn
OUTn
CLASS
= 10V
≤ 500μA
≤ 50mA
= 3.5V
≤ 5mA
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
54.75
MIN
15.5
27.5
16.0
13.5
21.5
31.5
45.2
0.08
220
143
300
3.0
5.5
7.5
0.4
32
45
51
20
53
53
8
2
7
3
1.84
10.4
29.7
14.5
0.12
TYP
240
160
500
3.3
2.7
4.3
0.8
6.5
2.4
54
25
10
17
61
23
33
48
61
30
9
8
4
9
MAX
0.01
18.5
20.5
15.5
24.5
34.9
50.8
260
180
700
3.6
0.9
7.5
2.8
66
57
57
57
30
15
12
15
12
32
67
10
67
14
9
5
UNITS
42701f
V/μs
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
kΩ
kΩ
kΩ
kΩ
μA
μA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V