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LTC4278 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4278
Description  12-Port PoE/PoE/LTPoE PSE Controller
Download  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4278 Datasheet(HTML) 9 Page - Linear Technology

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LTC4270/LTC4271
9
42701f
802.3at ILIM Threshold
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
DC Disconnect Threshold
vs Temperature
802.3at Current Limit Foldback
INT and SDAOUT Pull Down
Voltage vs Load Current
MOSFET Gate Drive With Fast
Pull Down
802.3at ICUT Threshold
vs Temperature
TEMPERATURE (°C)
–40
204
216
212
208
220
816
864
848
832
880
40
60
80
100 120
–20
0
42701 G09
20
PORT 1
REG 48h = C0h
RSENSE = 0.25Ω
TEMPERATURE (°C)
–40
152
162
164
160
158
156
154
166
608
648
640
632
624
616
664
656
40
60
80
100 120
–20
0
42701 G10
20
PORT 1
REG 47h = E2h
RSENSE = 0.25Ω
TEMPERATURE (°C)
–40
1.25
2.00
2.25
1.75
1.50
2.50
5
8
7
6
10
9
40
60
80
100 120
–20
0
42701 G11
20
PORT 1
REG 47h = E2h
RSENSE = 0.25Ω
VOUTn (V)
–54
0
600
500
800
700
400
300
200
100
900
0
125
100
75
50
25
225
200
175
150
–36
–27
–18
–9
0
–45
42701 G12
PORT 1
REG 48h = C0h
RSENSE = 0.25Ω
100μs/DIV
GND
0mA
42701 G14
VEE
VEE
PORT
CURRENT
500mA/DIV
GATE
VOLTAGE
10V/DIV
PORT
VOLTAGE
20V/DIV
CURRENT LIMIT
50Ω FAULT REMOVED
50Ω
FAULT
APPLIED
VDD = 3.3V
VEE = –54V
FAST PULL DOWN
LOAD CURRENT (mA)
42701 G13
020
10
30
40
50
60
3.0
2.5
2.0
1.5
1.0
0.5
0.0


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