LTC3789 datasheet(8/30 Pages) LINER

Part #	LTC3789

Description	High Efficiency, Synchronous,4-Switch Buck-Boost Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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8 / 30 page

LTC3780

8

3780ff

For more information www.linear.com/LTC3780

Oscillator Frequency

vs Temperature

Undervoltage Reset

vs Temperature

Minimum Current Sense

Threshold vs Duty Factor (Buck)

Maximum Current Sense

Threshold vs Duty Factor (Boost)

Maximum Current Sense

Threshold vs Duty Factor (Buck)

Minimum Current Sense

Threshold vs Temperature

Peak Current Threshold

vs VITH (Boost)

Valley Current Threshold

vs VITH (Buck)

Current Foldback Limit

Typical perForMance characTerisTics

TEMPERATURE (°C)

–75 –50

0

50

150

200

250

50

450

3780 G19

100

0

–25

75 100

25

125

300

350

400

VPLLFLTR = 2.4V

VPLLFLTR = 1.2V

VPLLFLTR = 0V

TEMPERATURE (°C)

–75 –50 –25

3.0

3.4

4.2

4.0

0

50

75

3780 G20

3.2

3.8

3.6

25

100 125

DUTY FACTOR (%)

–80

–60

–40

–20

80

60

40

20

3780 G21

0

100

DUTY FACTOR (%)

0

140

160

80

3780 G22

120

100

20

40

60

100

180

DUTY FACTOR (%)

110

120

130

140

20

40

60

80

3780 G23

100

0

TEMPERATURE (°C)

–75 –50

50

100

200

25

75

3780 G24

0

–50

–25

0

50

100 125

–100

–150

150

BOOST

BUCK

VITH (V)

0

–100

–50

0

50

100

200

0.4

0.8

1.2

1.6

3780 G25

1.8

2.4

150

VITH (V)

0

–150

–100

–50

0

50

100

0.4

0.8

1.2

1.6

3780 G26

2.0

2.4

VOSENSE (V)

0

40

80

120

160

200

BUCK

BOOST

0.2

0.4

0.6

3780 G32

0.8

TA = 25°C, unless otherwise noted.

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