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LTC4267 Datasheet(PDF) 5 Page - Linear Technology

Part No. LTC4267
Description  Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC4267 Datasheet(HTML) 5 Page - Linear Technology

 
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LTC4267
5
4267f
TYPICAL PERFOR
CE CHARACTERISTICS
A
Input Current vs Input Voltage
25k Detection Range
Input Current vs Input Voltage
Input Current vs Input Voltage
Input Current vs Input Voltage
Signature Resistance vs
Input Voltage
Normalized UVLO Threshold vs
Temperature
Power Good Output Low Voltage
vs Current
POUT Leakage Current
Current Limit vs Input Voltage
VPORTN VOLTAGE (V)
0
0
0.1
0.2
0.3
0.4
0.5
–2
–4
–6
–8
4267 G01
–10
TA = 25°C
VPORTN VOLTAGE (V)
–12
9.0
9.5
10.5
11.0
11.5
–14
–16
4267 G03
10.0
–18
–20
–22
12.0
85°C
–40°C
CLASS 1 OPERATION
VPORTN VOLTAGE (V)
0
0
10
20
30
40
50
–10
–20
–30
–40
4267 G02
–50
–60
CLASS 4
CLASS 3
CLASS 2
CLASS 1
CLASS 0
TA = 25°C
VPORTN VOLTAGE (V)
0
1
2
3
–45
–55
4267 G04
–60
–40
–50
EXCLUDES ANY LOAD CURRENT
TA = 25°C
VPORTN VOLTAGE (V)
–1
22
V1:
V2:
23
25
26
27
–3
–5
4267 G05
24
–7
–9
–6
–10
–2
–4
–8
28
RESISTANCE =
DIODES: S1B
TA = 25C
=
∆V
∆I
V2 – V1
I2 – I1
IEEE UPPER LIMIT
IEEE LOWER LIMIT
LTC4267 + 2 DIODES
LTC4267 ONLY
CURRENT (mA)
0
2
3
8
4267 G07
1
0
2
4
6
10
4
TA = 25°C
POUT PIN VOLTAGE (V)
0
0
30
60
120
90
20
40
4267 G08
60
VIN = 0V
TA = 25°C
VPORTN VOLTAGE (V)
–40
200
–60
4267 G09
100
–45
–50
–55
400
300
85°C
85°C
– 40°C
– 40°C
HIGH CURRENT MODE
LOW CURRENT MODE
TEMPERATURE (C)
–40
–2
–1
0
1
2
–20
0
20
40
4267 G06
60
80
APPLICABLE TO TURN-ON
AND TURN-0FF THRESHOLDS


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