LTC4269-1 datasheet(6/44 Pages) LINER

Part #	LTC4269-1

Description	IEEE 802.3at PD with Synchronous No-Opto Flyback Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC4269-1

6

42691fb

TYPICAL PERFORMANCE CHARACTERISTICS

Input Current vs Input Voltage

25k Detection Range

Input Current vs Input Voltage

VPORTP VOLTAGE (V)

0

0.1

0.2

0.3

0.4

0.5

2

468

42691 G01

10

TA = 25°C

VPORTP VOLTAGE (V)

(RISING)

0

10

20

30

40

50

10

20

30

40

42691 G02

50

60

TA = 25°C

CLASS 4

CLASS 3

CLASS 2

CLASS 1

CLASS 0

VPORTP VOLTAGE (V)

12

9.5

10.5

14

16

42691 G03

10.0

18

20

22

11.0

85°C

–40°C

CLASS 1 OPERATION

Signature Resistance

vs Input Voltage

PWRGD, T2P Output Low Voltage

vs Current

Active High PWRGD

Output Low Voltage vs Current

Inrush Current vs Input Voltage

CURRENT (mA)

0

0.4

0.6

8

42691 G07

0.2

0

2

4

6

10

0.8

TA = 25°C

CURRENT (mA)

0

0.4

1.0

0.5

1

42691 G08

0.2

0.8

0.6

1.5

2

TA = 25°C

VPORTP – VNEG = 4V

VPORTP VOLTAGE (V)

40

85

115

45

50

42691 G09

55

60

90

100

105

110

95

90

100

105

110

95

Class Operation vs Time

On-Resistance vs Temperature

VPORTP VOLTAGE (V)

1

22

V1:

V2:

23

25

26

27

3

5

42691 G04

24

7

9

610

24

8

28

RESISTANCE =

DIODES: HD01

TA = 25°C

=

V

I

V2 – V1

I2 – I1

IEEE UPPER LIMIT

IEEE LOWER LIMIT

LTC4269-1 ONLY

LTC4269-1 + 2 DIODES

VPORTP

VOLTAGE

10V/DIV

CLASS

CURRENT

10mA/DIV

TIME (10μs/DIV)

42691 G05

TA = 25°C

JUNCTION TEMPERATURE (°C)

–50

0.2

0.4

0.6

0.8

1.0

–25

025

50

42691 G06

75

100

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