LTC3859A datasheet(6/40 Pages) LINER

Part #	LTC3859A

Description	60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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6 / 40 page

LTC3890-3

6

38903f

For more information www.linear.com/3890-3

Typical perForMance characTerisTics

Total Input Supply Current

vs Input Voltage

EXTVCC Switchover and INTVCC

Voltages vs Temperature

INTVCC Line Regulation

Maximum Current Sense Voltage

vs ITH Voltage

SENSE– Pin Input Bias Current

Maximum Current Sense

Threshold vs Duty Cycle

Current Limit

vs Feedback Voltage

Quiescent Current vs Temperature

INTVCC vs Load Current

DUTY CYCLE (%)

0

75

85

80

38903 G15

65

70

60

20

40 50

100

90

60

10

30

90

70

INPUT VOLTAGE (V)

0

200

300

20

30 35 40 45 50 55 60 65

15

10

5

25

38903 G10

150

100

50

250

NO LOAD

300µA LOAD

VOUT = 3.3V

FIGURE 13 CIRCUIT

VSENSE COMMON MODE VOLTAGE (V)

0

20

38903 G14

400

300

10

15

5

25

800

700

600

500

200

100

0

–100

TEMPERATURE (°C)

–75

75

50

25

0

38903 G17

60

50

–50 –25

75

45

30

40

35

80

70

65

55

100 125 150

VIN = 12V

LOAD CURRENT (mA)

0

5.25

40

38903 G18

4.50

20

60

4.00

5.50

5.00

4.75

4.25

80

100

EXTVCC = 5V

EXTVCC = 8.5V

EXTVCC = 0V

VIN = 12V

VITH (V)

0

40

60

80

0.6

1.0

38903 G13

20

0

0.2

0.4

0.8

1.2

1.4

–20

–40

Burst Mode

OPERATION

PULSE-SKIPPING MODE

5% DUTY CYCLE

FORCED CONTINUOUS MODE

INPUT VOLTAGE (V)

3.0

4.0

4.5

5.5

20

30 35 40 45 50 55 60 65

15

10

0 5

25

38903 G12

3.5

5.0

ILOAD = 10mA

TEMPERATURE (°C)

–75

4.0

4.2

4.6

4.8

5.0

6.0

5.4

–25

25 50 75 100

38903 G11

4.4

5.6

5.8

5.2

–50

0

125 150

INTVCC

EXTVCC RISING

EXTVCC FALLING

FEEDBACK VOLTAGE (MV)

0

40

60

800

38903 G16

20

0

200

400 500

80

30

50

10

70

600

100

300

700

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LTC3859A Datasheet(PDF) 6 Page - Linear Technology

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