3859AL 데이터 시트보기 (PDF) - Linear Technology

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3859AL

Triple Output, Buck/Buck/Boost Synchronous ontroller with 28µA Burst Mode IQ

Linear Technology 

Typical Performance Characteristics

LTC3859AL

Efficiency and Power Loss

vs Output Current (Buck)

100

10000

90

80

1000

70

60

100

50

40

30

20

10

0

0.0001 0.001 0.01

FCM EFFICIENCY 10

PULSE-SKIPPING

EFFICIENCY

BURST LOSS

BURST EFFICIENCY 1

FCM LOSS

PULSE-SKIPPING

LOSS

0.1

0.1

1

10

OUTPUT CURRENT (A)

FIGURE 12 CIRCUIT

VIN = 10V, VOUT = 5V

3859al G01

Load Step (Buck)

Burst Mode Operation

Efficiency

vs Output Current (Buck)

100

90

VIN = 10V

80

VIN = 20V

70

60

50

40

30

20

10 FIGURE 12 CIRCUIT

VOUT = 5V

0

0.0001 0.001 0.01 0.1

1

10

OUTPUT CURRENT (A)

3859al G02

Load Step (Buck)

Pulse-Skipping Mode

Efficiency vs Input Voltage (Buck)

100

FIGURE 12 CIRCUIT

99 VOUT = 5V

ILOAD = 4A

98

97

96

95

94

93

92

0

5 10 15 20 25 30 35 40

INPUT VOLTAGE (V)

3859al G03

Load Step (Buck)

Forced Continuous Mode

VOUT

100mV/DIV

AC-COUPLED

VOUT

100mV/DIV

AC-COUPLED

VOUT

100mV/DIV

AC-COUPLED

IL

2A//DIV

50µs/DIV

VIN = 12V

VOUT = 5V

FIGURE 12 CIRCUIT

3859al G04

IL

2A//DIV

50µs/DIV

VIN = 12V

VOUT = 5V

FIGURE 12 CIRCUIT

3859al G05

IL

2A//DIV

50µs/DIV

VIN = 12V

VOUT = 5V

FIGURE 12 CIRCUIT

3859al G06

Inductor Current at Light Load

(Buck)

Soft Start-Up (Buck)

FORCED

CONTINUOUS

MODE

Burst Mode

OPERATION

1A/DIV

PULSE-

SKIPPING

MODE

2µs/DIV

VIN = 10V

VOUT = 5V

ILOAD = 1mA

FIGURE 12 CIRCUIT

3859al G07

5ms/DIV

VIN = 12V

FIGURE 12 CIRCUIT

VOUT2

2V/DIV

VOUT1

2V/DIV

RUN1/

RUN2

5V/DIV

3859al G08

For more information www.linear.com/3859AL

Buck Regulated Feedback Voltage

vs Temperature

808

806

804

802

800

798

796

794

792

–75 –50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

3859al G09

3859alf

7

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