LT3991-5_15 datasheet(4/24 Pages) LINER

Part #	LT3991-5

Description	55V, 1.2A Step-Down Regulator with 2.8A Quiescent Current

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3991/LT3991-3.3/LT3991-5

4

3991fa

Typical perForMance characTerisTics

Efficiency, VOUT = 3.3V

No Load Supply Current

LT3991 Feedback Voltage

LT3991-3.3 Output Voltage

LT3991-5 Output Voltage

Efficiency, VOUT = 5V

Efficiency, VOUT = 3.3V

Efficiency, VOUT = 5V

TA = 25°C, unless otherwise noted.

LOAD CURRENT (A)

3991 G01

100

40

50

60

70

80

90

30

0

1.2

1

0.8

0.6

0.4

0.2

VIN = 12V

VIN = 24V

VIN = 36V

VIN = 48V

VOUT = 5V

R1 = 1M

R2 = 309k

LOAD CURRENT (A)

3991 G02

90

30

40

50

60

70

80

20

0

1.2

1

0.8

0.6

0.4

0.2

VIN = 12V

VIN = 24V

VIN = 36V

VIN = 48V

LOAD CURRENT (mA)

3991 G03

100

30

20

10

40

50

60

70

80

90

0

0.01

1000

100

10

1

0.1

VIN = 36V

VIN = 48V

VOUT = 5V

R1 = 1M

R2 = 309k

VIN = 24V

VIN = 12V

LOAD CURRENT (mA)

3991 G04

90

30

20

10

40

50

60

70

80

0

0.01

1000

100

10

1

0.1

VIN = 12V

VIN = 24V

VIN = 36V

VIN = 48V

TEMPERATURE (°C)

3991 G05

100

10

1

–55 –25

155

125

95

65

35

5

DIODES, INC.

DFLS2100

INPUT VOLTAGE (V)

5

2.0

2.5

45

3991 G06

1.5

1.0

15

25 30

55

3.0

35

10

20

50

40

LT3991-5

LT3991-3.3

OUTPUT IN REGULATION

TEMPERATURE (°C)

3991 G07

1.205

1.180

1.185

1.190

1.195

1.200

1.175

–55

155

65

95

125

35

5

–25

TEMPERATURE (°C)

–50

3.315

3.330

3.345

35

95

3991 G28

3.300

3.285

–25

5

65

125

155

3.270

3.255

TEMPERATURE (°C)

–50

5.02

5.04

5.06

35

95

3991 G29

5.00

4.98

–25

5

65

125

155

4.96

4.94

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