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LTC4269-1 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC4269-1
Description  8-Port PoE/PoE PSE Controller
Download  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4269-1 Datasheet(HTML) 4 Page - Linear Technology

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LTC4290/LTC4271
4
429071f
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VEE
Main PoE Supply Voltage
AGND – VEE
For IEEE Type 1 Compliant Output
For IEEE Type 2 Compliant Output
l
l
45
51
57
57
V
V
Undervoltage Lock-Out
AGND – VEE
l
20
25
30
V
VDD
VDD Supply Voltage
VDD – DGND
l
3.0
3.3
3.6
V
Undervoltage Lock-Out
VDD – DGND
2.7
V
VCAP1
Internal Regulator Supply Voltage
VCAP1 – DGND
1.84
V
VCAP2
Internal Regulator Supply Voltage
VCAP2 – VEE
4.3
V
IEE
VEE Supply Current
(AGND – VEE) = 55V
l
9
15
mA
REE
VEE Supply Resistance
VEE < 15V
l
12
IDD
VDD Supply Current
(VDD – DGND) = 3.3V
l
10
15
mA
Detection
Detection Current – Forced Current
First Point, AGND – VOUTn = 9V
Second Point, AGND – VOUTn = 3.5V
l
l
220
143
240
160
260
180
µA
µA
Detection Voltage – Forced Voltage
AGND – VOUTn, 5µA ≤ IOUTn ≤ 500µA
First Point
Second Point
l
l
7
3
8
4
9
5
V
V
Detection Current Compliance
AGND – VOUTn = 0V
l
0.8
0.9
mA
VOC
Detection Voltage Compliance
AGND – VOUTn, Open Port
l
10.4
12
V
Detection Voltage Slew Rate
AGND – VOUTn, CPORT = 0.15µF
l
0.01
V/µs
Min. Valid Signature Resistance
l
15.5
17
18.5
Max. Valid Signature Resistance
l
27.5
29.7
32
Classification
VCLASS
Classification Voltage
AGND – VOUTn, 0mA ≤ IOUTn ≤ 50mA
l
16.0
20.5
V
Classification Current Compliance
VOUTn = 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
VMARK
Classification Mark State Voltage
AGND – VOUTn, 0.1mA ≤ ICLASS ≤ 5mA
l
7.5
9
10
V
Mark State Current Compliance
VOUTn = AGND
l
53
61
67
mA
Gate Driver
GATE Pin Pull-Down Current
Port Off, VGATEn = VEE + 5V
Port Off, VGATEn = VEE + 1V
l
l
0.4
0.08
0.12
mA
mA
GATE Pin Fast Pull-Down Current
VGATEn = VEE + 5V
30
mA
GATE Pin On Voltage
VGATEn – VEE, IGATEn = 1µA
l
8
12
14
V
Output Voltage Sense
VPG
Power Good Threshold Voltage
VOUTn – VEE
l
2
2.4
2.8
V
OUT Pin Pull-Up Resistance to AGND
0V ≤ (AGND – VOUT) ≤ 5V
l
300
500
700
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)


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