LTC4269IDKD-2-TR datasheet(9/34 Pages) LINER

Part #	LTC4269IDKD-2-TR

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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9 / 34 page

LTC4269-2

42692fb

Typical perForMance characTerisTics

tDELAY: SOUT Rise to OUT Rise

vs Temperature

tDELAY: SOUT Rise to OUT Rise

vs RDELAY

OUT Rise/Fall Time vs OUT Load

Capacitance

OUT: Max Duty Cycle vs fOSC

OUT: Max Duty Cycle CLAMP

vs SD_VSEC

OUT: Max Duty Cycle CLAMP

vs SS_MAXDC

SS_MAXDC Setting vs fOSC

(for OUT DC = 72%)

SS_MAXDC Reset and Active

Thresholds vs Temperature

TEMPERATURE (°C)

–50

0

50

200

0

50

75

42692 G28

150

100

–25

25

100 125

RDELAY = 40k

RDELAY = 120k

RDELAY (k)

0

80

240

80

160

200

42692 G29

160

40

120

240

TA = 25°C

OUT LOAD CAPACITANCE (pF)

0

50

25

125

2000

3000

100

75

1000

4000

5000

tr

tf

42692 G30

TA = 25°C

fOSC (kHz)

100

70

80

100

200

300

90

400

500

42692 G31

TA = 25°C

SS_MAXDC = 2.5V

SD_VSEC = 1.4V

SD_VSEC (V)

1.32

0

70

80

90

1.65

1.98

60

50

40

30

20

10

2.31

2.64

42692 G32

TA = 25°C

SS_MAXDC = 1.84V

fOSC = 200kHz

RDELAY = 10k

SS_MAXDC (V)

1.60

20

70

80

90

1.84

2.08

60

50

40

30

42692 G33

TA = 25°C

fOSC = 200kHz

RDELAY = 10k

SD_VSEC = 1.32V

SD_VSEC = 1.98V

SD_VSEC = 2.64V

fOSC (kHz)

100

1.60

2.08

2.20

2.32

500

400

300

200

1.96

1.84

1.72

42692 G34

TA = 25°C

SD_VSEC = 1.32V

RDELAY = 10k

0

0.8

1.0

1.2

0.6

0.4

0.2

42692 G35

TEMPERATURE (°C)

–50

0

50

75

–25

25

100 125

ACTIVE THRESHOLD

RESET THRESHOLD

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