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LTC4257CS8 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC4257CS8
Description  IEEE 802.3af PD Power over Ethernet Interface Controller
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4257CS8 Datasheet(HTML) 4 Page - Linear Technology

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background image
LTC4257
4
4257fb
Input Current vs Input Voltage
INPUT VOLTAGE (V)
0
1
2
3
–45
–55
4257 G04
–60
–40
–50
EXCLUDES ANY LOAD CURRENT
TA = 25°C
Normalized UVLO Threshold
vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
VOUT Leakage Current
Input Current vs Input Voltage
INPUT VOLTAGE (V)
0
0
10
20
30
40
50
–10
–20
–30
–40
4257 G01
–50
–60
CLASS 4
CLASS 3
CLASS 2
CLASS 1
CLASS 0
TA = 25°C
INPUT VOLTAGE (V)
0
0
0.1
0.2
0.3
0.4
0.5
–2
–4
–6
–8
4357 G02
–10
TA = 25°C
INPUT VOLTAGE (V)
–12
9.0
9.5
10.5
11.0
11.5
–14
–16
4257 G03
10.0
–18
–20
–22
12.0
85
°C
–40
°C
CLASS 1 OPERATION
Input Current vs Input Voltage
25k Detection Range
Input Current vs Input Voltage
INPUT VOLTAGE (V)
–1
22
V1:
V2:
23
25
26
27
–3
–5
4257 G05
24
–7
–9
–6
–10
–2
–4
–8
28
RESISTANCE =
DIODES: S1B
TA = 25°C
=
∆V
∆I
V2 – V1
I2 – I1
IEEE UPPER LIMIT
IEEE LOWER LIMIT
LTC4257 + 2 DIODES
LTC4257 ONLY
Signature Resistance
vs Input Voltage
TEMPERATURE (
°C)
–40
–2
–1
0
1
2
–20
0
20
40
4257 G06
60
80
APPLICABLE TO TURN-ON
AND TURN-0FF THRESHOLDS
Power Good Output Low Voltage
vs Current
CURRENT (mA)
0
2
3
8
4257 G07
1
0
2
4
6
10
4
TA = 25°C
VOUT PIN VOLTAGE (V)
0
0
30
60
120
90
20
40
42571 G09
60
VIN = 0V
TA = 25°C
Current Limit vs Input Voltage
INPUT VOLTAGE (V)
–40
345
355
–60
4257 G09
335
325
–45
–50
–55
375
365
VOUT = VIN + 5V
85
°C
25
°C
–40
°C



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