LTC4269IDKD-2-TRPBF datasheet(8/34 Pages) LINER

Part #	LTC4269IDKD-2-TRPBF

Description	IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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8 / 34 page

LTC4269-2

42692fb

Typical perForMance characTerisTics

COMP Sink Current

vs Temperature

(Disabled) COMP Pin Current

vs Temperature

ISENSE Maximum Threshold

vs COMP

ISENSE Maximum Threshold

vs Temperature

ISENSE Pin Current (Out of Pin)

vs Duty Cycle

ISENSE Maximum Threshold

vs Duty Cycle (Programming

Slope Compensation)

OC (Overcurrent) Threshold

vs Temperature

Blank Duration vs Temperature

BLANK Duration vs RBLANK

TEMPERATURE (°C)

–50

5.0

12.5

0

50

75

42692 G19

10.0

7.5

–25

25

100 125

FB = 1.4V

COMP = 1.6V

TEMPERATURE (°C)

–50

0

50

40

30

0

50

75

42692 G20

10

20

–25

25

100 125

FB = VREF

COMP = 1.6V

COMP (V)

0

240

160

200

120

1.0

2.0

2.5

42692 G21

40

80

0.5

1.5

3.0

TA = 25°C

RISENSE = 0k

OC THRESHOLD

TEMPERATURE (°C)

–50

200

210

240

0

50

75

42692 G22

230

220

–25

25

100 125

COMP = 2.5V

RISENSE = 0k

DUTY CYCLE (%)

0

10

40

20

50 60

42692 G23

30

20

10

30 40

80

70

90 100

TA = 25°C

DUTY CYCLE (%)

0

175

185

195

225

20

50 60

42692 G24

215

205

10

30 40

80

70

90 100

RSLOPE = 1k

RSLOPE = 470

RSLOPE = 0

TA = 25°C

COMP = 2.5V

TEMPERATURE (°C)

–50

80

90

120

0

50

75

42692 G25

110

100

–25

25

100 125

PRECISION OVERCURRENT THRESHOLD

INDEPENDENT OF DUTY CYCLE

TEMPERATURE (°C)

–50

0

200

800

0

50

75

42692 G26

600

400

–25

25

100 125

RBLANK = 40k

RBLANK = 120k

RBLANK (k)

0

400

200

1000

40

80 100

42692 G27

800

600

20

60

140

120

160

TA = 25°C

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LTC4269IDKD-2-TRPBF Datasheet(PDF) 8 Page - Linear Technology

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