LTC3774 datasheet(5/38 Pages) LINER

Part #	LTC3774

Description	Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3774

5

3774fc

For more information www.linear.com/LTC3774

TYPICAL PERFORMANCE CHARACTERISTICS

Input Quiescent Current

vs Input Voltage

Shutdown Current

vs Input Voltage

INTVCC Line Regulation

Oscillator Frequency

vs Input Voltage

Maximum Current Sense Threshold

vs Common Mode Voltage

Maximum Current Sense

Threshold vs Feedback Voltage

(Current Foldback)

Current Sense Threshold

vs ITH Voltage

COMMON MODE VOLTAGE (V)

0

20

25

30

1.5

2

2.5

3

3774 G01

15

10

0.5

1

3.5

5

0

35

INTVCC

3/4 INTVCC

1/2 INTVCC

1/4 INTVCC

0

FEEDBACK VOLTAGE (V)

0

20

25

30

0.2

0.3

0.4

0.5

3774 G02

15

10

0.1

0.6

5

0

35

ILIM = 0

ILIM = 1/4 INTVCC

ILIM = 1/2 INTVCC

ILIM = 3/4 INTVCC

ILIM = INTVCC

V(ITH) (V)

0

20

25

30

0.75 1

1.5

1.25

1.75

3774 G03

15

10

5

0

0.25 0.5

2

–5

–10

35

ILIM = 0

ILIM = 1/4 INTVCC

ILIM = 1/2 INTVCC

ILIM = 3/4 INTVCC

ILIM = INTVCC

INPUT VOLTAGE (V)

0

15

20

30

25

35

3774 G04

10

8

6

4

5

10

40

2

0

12

INPUT VOLTAGE (V)

0

15

20

30

25

35

3774 G05

50

40

30

20

5

10

40

10

0

60

INPUT VOLTAGE (V)

0

15

20

30

25

35

3774 G06

5

4

3

2

5

10

40

1

0

6

INPUT VOLTAGE (V)

0

15

20

30

25

35

3774 G07

1000

800

600

400

5

10

40

200

0

1200

23.2k

47.5k

75k

Load Step (Continuous

Conduction Mode)

50µs/DIV

3774 G08

VOUT = 1.5V

50mV/DIV

AC-COUPLED

ILOAD

5A-DIV

15A TO 30A

VIN = 12V

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