3412EFE 데이터 시트보기 (PDF) - Linear Technology

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3412EFE

2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator

Linear Technology 

LTC3412

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Input Voltage

98

LOAD = 100mA

96

LOAD = 1A

94

92

90

LOAD = 2.5A

88 VOUT = 2.5V

1MHz

Burst Mode OPERATION

86

2.55 3.05 3.55 4.05 4.55

INPUT VOLTAGE (V)

5.05

3412 G04

Burst Mode Operation

Efficiency vs Frequency

97

96

95

1μH

0.47μH

94

2.2μH

93

VIN = 3.3V

92 VOUT = 2.5V

LOAD = 1A

Burst Mode OPERATION

91

300 800 1300 1800 2300 2800 3300 3800

FREQUENCY (kHz)

3412 G05

Load Step Transient Forced

Continuous

Load Regulation

0.02

0.00

–0.02

VIN = 3.3V

VOUT = 2.5V

–0.04

–0.06

–0.08

–0.10

–0.12

–0.14

–0.16

–0.18

0

0.5

1

1.5

2

2.5

LOAD CURRENT (A)

3412 G06

Load Step Transient Burst Mode

Operation

4μs/DIV

VIN = 3.3V, VOUT = 2.5V

LOAD = 50mA

3412 G07

Start-Up, Burst Mode Operation

1ms/DIV

VIN = 3.3V, VOUT = 2.5V

LOAD = 1Ω

3412 G10

20μs/DIV

VIN = 3.3V, VOUT = 2.5V

LOAD STEP = NO LOAD TO 2.5A

3412 G08

Reference Voltage

vs Temperature

0.7960

VIN = 3.3V

0.7955

0.7950

0.7945

0.7940

0.7935

0.7930

0.7925

0.7920

–45 –25 –5 15 35 55 75 95 115 120

TEMPERATURE (°C)

3412 G11

4

20μs/DIV

VIN = 3.3V, VOUT = 2.5V

LOAD STEP = 50mA TO 2.5A

3412 G09

Switch On-Resistance

vs Input Voltage

120

100

PFET ON-RESISTANCE

80

60

NFET ON-RESISTANCE

40

20

0

2.5

3

3.5

4

4.5

5

INPUT VOLTAGE (V)

3412 G12

3412fb

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