LTC3859EFE-TRPBF datasheet(7/40 Pages) LINER

Part #	LTC3859EFE-TRPBF

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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7 / 40 page

LTC3859

7

3859f

TYPICAL PERFORMANCE CHARACTERISTICS

Load Step (Boost)

Burst Mode Operation

Load Step (Boost)

Pulse-Skipping Mode

Load Step (Boost)

Forced Continuous Mode

Inductor Current at Light Load

(Boost)

Soft Start-Up (Boost)

Boost Regulated Feedback

Voltage vs Temperature

Efﬁciency and Power Loss

vs Output Current (Boost)

Efﬁciency

vs Output Current (Boost)

Efﬁciency vs Input Voltage (Boost)

OUTPUT CURRENT (A)

0.0001

100

90

70

50

30

10

80

60

40

20

0

10000

100

1

1000

10

0.1

110

0.01

3859 G10

0.1

0.001

FIGURE 12 CIRCUIT

VIN = 5V, VOUT = 10V, VBIAS = VIN

CCM EFFICIENCY

PULSE-SKIPPING

EFFICIENCY

BURST LOSS

BURST

EFFICIENCY

CCM LOSS

PULSE-SKIPPING

LOSS

OUTPUT CURRENT (A)

0.0001

100

90

70

50

30

10

80

60

40

20

0

110

0.01

3859 G11

0.1

0.001

VIN = 5V

FIGURE 12 CIRCUIT

VBIAS = VIN

VOUT = 10V

VIN = 8V

INPUT VOLTAGE (V)

2

100

99

97

95

91

92

93

98

96

94

90

6789

10

4

3

3859 G12

5

FIGURE 12 CIRCUIT

VBIAS = VIN

VOUT = 10V

ILOAD = 2A

200μs/DIV

VOUT

100mV/

DIV

AC-

COUPLED

IL

5A/DIV

3859 G13

VOUT = 10V

VIN = 5V

FIGURE 12 CIRCUIT

200μs/DIV

VOUT

100mV/DIV

AC-COUPLED

IL

5A/DIV

3859 G14

VOUT = 10V

VIN = 5V

FIGURE 12 CIRCUIT

200μs/DIV

VOUT

100mV/DIV

AC-COUPLED

IL

5A/DIV

3859 G15

VOUT = 10V

VIN = 5V

FIGURE 12 CIRCUIT

2μs/DIV

FORCED

CONTINUOUS

MODE

Burst Mode

OPERATION

5A/DIV

PULSE-

SKIPPING

MODE

3859 G16

VOUT = 10V

VIN = 7V

ILOAD = 1mA

FIGURE 12 CIRCUIT

2ms/DIV

VOUT3

2V/DIV

GND

3859 G17

VIN = 5V

FIGURE 12 CIRCUIT

TEMPERATURE (°C)

–45

1.212

1.209

1.203

1.191

1.194

1.197

1.206

1.200

1.188

30

55

80

105

130

–20

3859 G18

5

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LTC3859EFE-TRPBF Datasheet(PDF) 7 Page - Linear Technology

LTC3859EFE-TRPBF Datasheet(HTML) 7 Page - Linear Technology

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