LTC4257-1_15 datasheet(4/20 Pages) LINER

Part #	LTC4257-1

Description	Power over Ethernet Interface Controller with Dual Current Limit

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC4257-1

4

42571fb

Signature Resistance

vs Input Voltage

Normalized UVLO Threshold

vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

VOUT Leakage Current

Current Limit vs Input Voltage

Input Current vs Input Voltage

25k Detection Range

Input Current vs Input Voltage

INPUT VOLTAGE (V)

0

0.1

0.2

0.3

0.4

0.5

–2

–4

–6

–8

4357 G01

–10

TA = 25°C

INPUT VOLTAGE (V)

0

10

20

30

40

50

–10

–20

–30

–40

42571 G02

–50

–60

CLASS 4

CLASS 3

CLASS 2

CLASS 1

CLASS 0

TA = 25°C

INPUT VOLTAGE (V)

–12

9.0

9.5

10.5

11.0

11.5

–14

–16

42571 G03

10.0

–18

–20

–22

12.0

85

°C

–40

°C

CLASS 1 OPERATION

Input Current vs Input Voltage

INPUT VOLTAGE (V)

0

1

2

3

–45

–55

42571 G04

–60

–40

–50

EXCLUDES ANY LOAD CURRENT

TA = 25°C

INPUT VOLTAGE (V)

–1

22

V1:

V2:

23

25

26

27

–3

–5

42571 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

LTC4257-1 + 2 DIODES

LTC4257-1 ONLY

TEMPERATURE (

°C)

–40

–2

–1

0

1

2

–20

0

20

40

42571 G06

60

80

APPLICABLE TO TURN-ON

AND TURN-0FF THRESHOLDS

Power Good Output Low Voltage

vs Current

CURRENT (mA)

0

2

3

8

42571 G07

1

0

2

4

6

10

4

TA = 25°C

VOUT PIN VOLTAGE (V)

0

30

60

120

90

20

40

42571 G08

60

VIN = 0V

TA = 25°C

INPUT VOLTAGE (V)

–40

200

–60

42571 G09

100

–45

–50

–55

400

300

85

°C

85

°C

–40

°C

–40

°C

HIGH CURRENT MODE

LOW CURRENT MODE

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LTC4257-1 Datasheet(PDF) 4 Page - Linear Technology

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