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LTC4274 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4274
Description  Single PoE PSE Controller High Capacitance Legacy Device Detection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4274 Datasheet(HTML) 9 Page - Linear Technology

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LTC4274
9
4274fa
TYPICAL PERFORMANCE CHARACTERISTICS
ADC Noise Histogram
Current Readback in Slow Mode
ADC Integral Nonlinearity
Current Readback in Slow Mode
ADC Noise Histogram Port
Voltage Readback in Fast Mode
ADC Integral Nonlinearity
Voltage Readback in Fast Mode
ADC Noise Histogram Port
Voltage Readback in Slow Mode
ADC Integral Nonlinearity
Voltage Readback in Slow Mode
INTandSDAOUTPullDownVoltage
vs Load Current
MOSFET Gate Drive With Fast
Pull Down
ADC OUTPUT
0
300
250
200
150
100
50
6139
6141
4274 G17
6143
6145
6147
VSENSEn – VEE = 110.4mV
CURRENT SENSE RESISTOR INPUT VOLTAGE (mV)
0
0
0.5
400
4274 G18
–0.5
–1.0
100
200 250
500
1.0
300
50
150
450
350
ADC OUTPUT
260
0
600
500
400
300
200
100
262
261
263
4274 G19
264
265
AGND – VOUTn = 48.3V
PORT VOLTAGE (V)
0
0
0.5
50
4274 G20
–0.5
–1.0
20
30
60
1.0
40
10
ADC OUTPUT
8532
0
600
500
400
300
200
100
8534
8533
8535
4274 G21
8536
AGND – VOUTn = 48.3V
PORT VOLTAGE (V)
0
0
0.5
50
4274 G22
–0.5
–1.0
20
30
60
1.0
40
10
LOAD CURRENT (mA)
0
0
3
2.5
2
1.5
1
0.5
10
5
15
4274 G23
20
25
30
35
40
100μs/DIV
GND
0mA
4274 G24
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


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