LT3581 datasheet(5/36 Pages) LINER

Part #	LT3581

Description	3.3A Boost/Inverting DC/DC Converter with Fault Protection

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3581

3581f

Typical perForMance characTerisTics

Switch Fault Current Limit vs

Temperature

Positive Feedback Voltage

vs Temperature

CLKOUT Duty Cycle

vs Temperature

Oscillator Frequency

Frequency Foldback

Gate Current vs Gate Voltage

Switch Fault Current Limit vs

Duty Cycle

Switch Saturation Voltage with

SW1 and SW2 Tied Together

Current Sharing Between SW1 and

SW2 When Tied Together

TA = 25°C, unless otherwise noted.

DUTY CYCLE (%)

20

0

1

2

3

4

30

50

70

80

3581 G01

5

6

40

60

SW1 + SW2 CURRENT (A)

0

200

250

300

5

4

3581 G02

150

100

0

3

2

1

50

450

400

350

SW1 + SW2 CURRENT (A)

0

50

60

70

5

4

3581 G03

40

30

0

3

2

1

10

20

100

90

80

TEMPERATURE (°C)

–50 –25

0

1

2

3

4

0

50

125 150

3581 G04

5

6

25

75 100

–50 –25

0

50

125 150

25

75 100

TEMPERATURE (°C)

1.2100

1.2125

1.2200

3581 G05

1.2175

1.2150

TEMPERATURE (°C)

–75 –50 –25

10

20

30

40

50

0

50

125 150

3581 G06

60

80

70

25

75 100

–50 –25

0

50

125 150

25

75 100

TEMPERATURE (°C)

0

3200

3581 G07

2800

2400

2000

1600

1200

800

400

RT = 34k

RT = 432k

FB VOLTAGE (V)

0

1/4

1/5

1/6

1/2

1/3

1

0.2

0.4

0.6

0.8

3581 G08

1.0

1.2

BOOSTING

CONFIGURATIONS

INVERTING

CONFIGURATIONS

0

60

80

20

40

GATE VOLTAGE (V)

0

1000

3581 G09

900

800

700

600

500

400

200

100

300

125°C

–40°C

25°C

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LT3581 Datasheet(PDF) 5 Page - Linear Technology

LT3581 Datasheet(HTML) 5 Page - Linear Technology

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