LTC3862-2 datasheet(5/38 Pages) LINER

Part #	LTC3862-2

Description	60V PolyPhase Synchronous Boost Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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5 / 38 page

LTC3784

5

3784fb

For more information www.linear.com/LTC3784

Typical perForMance characTerisTics

Load Step

Burst Mode Operation

Load Step

Forced Continuous Mode

Load Step

Pulse-Skipping Mode

Efficiency and Power Loss

vs Output Current

Efficiency and Power Loss

vs Output Current

Efficiency vs Load Current

Inductor Currents at Light Load

Soft Start-Up

Regulated Feedback Voltage

vs Temperature

OUTPUT CURRENT (A)

40

50

60

70

80

10

3784 G01

30

20

10

0

90

100

10

100

1000

1

0.1

10000

0.01

0.1

1

BURST EFFICIENCY

PULSE-SKIPPING

EFFICIENCY

FORCED CONTINUOUS

MODE EFFICIENCY

BURST LOSS

PULSE-SKIPPING

LOSS

FORCED CONTINUOUS

MODE LOSS

VIN = 12V

VOUT = 24V

FIGURE 10 CIRCUIT

OUTPUT CURRENT (A)

40

50

60

70

80

3784 G02

30

20

10

0

90

100

10

100

1000

1

0.1

10000

0.01

0.1

1

10

BURST EFFICIENCY

BURST LOSS

VIN = 12V

VOUT = 24V

Burst Mode OPERATION

FIGURE 10 CIRCUIT

0.0001 0.001

0.00001

INPUT VOLTAGE (V)

0

90

92

94

96

5

10

15

20

98

100

91

93

95

97

99

25

3784 G03

VOUT = 12V

VIN = 12V

ILOAD = 2A

FIGURE 10 CIRCUIT

VOUT = 24V

VOUT

500mV/DIV

INDUCTOR

CURRENT

5A/DIV

LOAD STEP

5A/DIV

VIN = 12V

VOUT = 24V

LOAD STEP FROM 100mA TO 5A

FIGURE 10 CIRCUIT

200µs/DIV

3784 G04

VOUT

500mV/DIV

INDUCTOR

CURRENT

5A/DIV

LOAD STEP

5A/DIV

VIN = 12V

VOUT = 24V

LOAD STEP FROM 100mA TO 5A

FIGURE 10 CIRCUIT

200µs/DIV

3784 G05

VOUT

500mV/DIV

INDUCTOR

CURRENT

5A/DIV

LOAD STEP

5A/DIV

VIN = 12V

VOUT = 24V

LOAD STEP FROM 100mA TO 5A

FIGURE 10 CIRCUIT

200µs/DIV

3784 G06

PULSE-

SKIPPING

MODE

Burst Mode

OPERATION

5A/DIV

FORCED

CONTINUOUS

MODE

VIN = 12V

VOUT = 24V

ILOAD = 200µA

FIGURE 10 CIRCUIT

5µs/DIV

3784 G07

0V

VOUT

5V/DIV

VIN = 12V

VOUT = 24V

FIGURE 10 CIRCUIT

2ms/DIV

3784 G08

TEMPERATURE (°C)

–60

1.209

15

3784 G09

1.200

1.194

–35 –10

40

1.191

1.188

1.212

1.206

1.203

1.197

65 90

140

115

TA = 25°C unless otherwise noted.

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LTC3862-2 Datasheet(PDF) 5 Page - Linear Technology

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