LT3689EUD-5-TRPBF datasheet(5/32 Pages) LINER

Part #	LT3689EUD-5-TRPBF

Description	700mA Step-Down Regulator with Power-On Reset and Watchdog Timer

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3689/LT3689-5

5

3689fa

TYPICAL PERFORMANCE CHARACTERISTICS

No-Load Supply Current vs VIN

No-Load Supply Current

Maximum Load Current, 5VOUT

Maximum Output Current, 3.3VOUT

Switch Current Limit

vs Duty Cycle

Switch Current Limit

vs Temperature

Switch Voltage Drop

Maximum VIN for Full Frequency

INPUT VOLTAGE (V)

0

80

100

120

35

60

40

10

20

5

15

25

30

40

20

0

140

3689 G04

TA = 25°C

TEMPERATURE (°C)

–50

0

200

400

600

–25

0

25

50

100

75

125

800

100

300

500

700

150

3689 G05

CATCH DIODE: DIODES INC. B140HB

VIN = 12V

VOUT = 3.3V

INCREASED SUPPLY

CURRENT DUE TO

CATCH DIODE LEAKAGE

AT HIGH TEMPERATURE

0

0.4

0.8

1.2

0.2

0.6

1.0

1.4

VIN (V)

6

12

18

30

24

36

3689 G06

MINIMUM

TYPICAL

TA = 25°C

L = 12μH

f = 1MHz

0

0.4

0.2

0.6

0.3

0.1

0.5

0.7

LOAD CURRENT (A)

0

10

20

30

40

5

15

25

35

3689 G07

VO = 5V

L = 6.8μH

f = 2MHz

SYNC = 5V

TA = 25°C

TA = 85°C

0

0.4

0.2

0.6

0.3

0.1

0.5

0.7

LOAD CURRENT (A)

0

10

20

30

5

15

25

35

3689 G08

VO = 3.3V

L = 4.7μH

f = 2MHz

SYNC = 3.3V

TA = 25°C

TA = 85°C

VIN (V)

4

0

0.4

0.8

1.2

8

12

16

20

28

24

32

0.2

0.6

1.0

36

3689 G09

TA = 25°C

L = 12μH

f = 700kHz

MINIMUM

TYPICAL

DUTY CYCLE (%)

0

0.4

0.8

1.2

1.6

2.0

20

40

60

80

100

3689 G10

TA = 25°C

SYNC = LOW

MINIMUM

TYPICAL

TEMPERATURE (°C)

0

0.5

1.0

1.5

2.0

3689 G11

SYNC = HIGH

SYNC = LOW

–50 –25

0

25

50

100

75

125 150

SWITCH CURRENT (mA)

0

400

500

300

200

400

800

200

600

1000

100

0

600

3689 G12

TA = 125°C

TA = 25°C

TA = –50°C

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LT3689EUD-5-TRPBF Datasheet(PDF) 5 Page - Linear Technology

LT3689EUD-5-TRPBF Datasheet(HTML) 5 Page - Linear Technology

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