LT1072CK datasheet(4/16 Pages) LINER

Part #	LT1072CK

Description	1.25A High Efficiency Switching Regulator

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Manufacturer	LINER [Linear Technology]

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4

LT1072

1072fc

Switch Current Limit vs Duty Cycle

Maximum Duty Cycle

Flyback Blanking Time

DUTY CYCLE (%)

0

4

3

2

1

0

80

LT1072 • TPC01

20

40

60

100

70

10

30

50

90

–55°C

125°C

25°C

JUNCTION TEMPERATURE (°C)

–75

90

91

93

94

95

–25

25

50

150

LT1072 • TPC02

92

–50

0

75 100 125

96

JUNCTION TEMPERATURE (°C)

–75

1.0

1.2

1.6

1.8

2.0

–25

25

50

150

LT1072 • TPC03

1.4

–50

0

75 100 125

2.2

Minimum Input Voltage

Switch Saturation Voltage

Isolated Mode Flyback Reference

Voltage

TEMPERATURE (°C)

–75

2.3

2.4

2.6

2.7

2.8

–25

25

50

150

LT1072 • TPC04

2.5

–50

0

75 100 125

2.9

SWITCH CURRENT = 1.25A

SWITCH CURRENT = 0A

SWITCH CURRENT (A)

0

0.8

1.2

2

LT1072 • TPC05

0.4

0

0.5

1

1.5

0.25

0.75

1.25

1.75

1.6

0.6

1.0

0.2

1.4

150°C

100°C

–55°C

25°C

TEMPERATURE (C°)

–75

19

20

21

125

LT1072 • TPC06

18

17

15

–25

25

75

–50

150

0

50

100

16

23

22

RFEEDBACK = 500Ω

RFEEDBACK = 1kΩ

RFEEDBACK = 10kΩ

Line Regulation

Reference Voltage and Switching

Frequency vs Temperature

Feedback Bias Current vs

Temperature

INPUT VOLTAGE (V)

0

–5

–3

–1

1

10

20

30

40

LT1072 • TPC07

50

3

5

–4

–2

0

2

4

60

TJ = 150°C

TJ = – 55°C

TJ =

25°

C

TEMPERATURE (°C)

–75

1.242

1.244

1.246

125

LT1072 • TPC08

1.240

1.238

1.234

–25

25

75

–50

150

0

50

100

1.236

1.250

1.248

38

39

40

37

36

34

35

42

41

REFERENCE VOLTAGE

SWITCHING FREQUENCY

TEMPERATURE (°C)

–75

400

500

600

125

LT1072 • TPC09

300

200

0

–25

25

75

–50

150

0

50

100

800

700

TYPICAL PERFOR A CE CHARACTERISTICS

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