LTC3859IFE-PBF datasheet(9/40 Pages) LINER

Part #	LTC3859IFE-PBF

Description	Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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9 / 40 page

LTC3859

9

3859f

TYPICAL PERFORMANCE CHARACTERISTICS

Buck Foldback Current Limit

Oscillator Frequency

vs Temperature

Undervoltage Lockout Threshold

vs Temperature

Shutdown (RUN) Threshold

vs Temperature

Charge Pump Charging Current

vs Operating Frequency

Charge Pump Charging Current

vs Switch Voltage

Shutdown Current vs Temperature

Shutdown Current

vs Input Voltage

Quiescent Current vs Temperature

TEMPERATURE (°C)

–45

22

20

16

14

10

18

12

8

30

55

80

105

130

–20

3859 G28

5

INPUT VOLTAGE (V)

5

25

20

15

5

10

0

20

25

30

35

40

10

3859 G29

15

TEMPERATURE (°C)

–45

100

90

80

50

60

70

40

30

55

80

105

130

ONE CHANNEL ON

–20

3859 G30

ALL CHANNELS ON

5

FEEDBACK VOLTAGE (mV)

0

70

60

50

20

10

30

40

65

55

45

15

5

25

35

0

300 400 500 600 700 800

100

3859 G31

200

TEMPERATURE (°C)

–45

600

550

500

350

400

450

300

30

55

80

105

130

–20

3859 G32

FREQ = INTVCC

FREQ = GND

5

TEMPERATURE (°C)

–45

4.4

4.3

4.2

3.6

3.8

4.0

3.4

3.5

3.7

3.9

4.1

30

55

80

105

130

–20

3859 G33

RISING

FALLING

5

TEMPERATURE (°C)

–45

1.40

1.35

1.30

1.20

1.00

1.15

1.10

1.05

1.25

30

55

80

105

130

–20

3859 G34

RUN1 RISING

RUN2,3 RISING

RUN1 FALLING

RUN2,3 FALLING

5

OPERATING FREQUENCY (kHz)

100

80

90

60

70

20

30

0

10

40

50

400

500

600

700

800

200

3859 G35

–45°C

25°C

130°C

300

VBOOST3 = 16V

VSW3 = 12V

SWITCH VOLTAGE (V)

5

100

80

90

60

70

20

30

0

10

40

50

20

25

30

35

40

10

3859 G36

FREQ = 0V

FREQ = INTVCC

15

VBOOST3 – VSW3 = 4V

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LTC3859IFE-PBF Datasheet(PDF) 9 Page - Linear Technology

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