LT8611 데이터 시트보기 (PDF) - Linear Technology

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LT8611

42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5µA Quiescent Current

Linear Technology 

Typical Performance Characteristics

LT8611

RT Programmed Switching

Frequency

250

225

200

175

150

125

100

75

50

25

0

0.2 0.6

1

1.4 1.8 2.2

SWITCHING FREQUENCY (MHz)

8611 G28

VIN UVLO

3.6

3.4

3.2

3.0

2.8

2.6

2.4

2.2

2.0

–55 –25

5 35 65 95

TEMPERATURE (°C)

125 155

8611 G29

Bias Pin Current

5.00

VBIAS = 5V

4.75 VOUT = 5V

ILOAD = 1A

4.50 fSW = 700kHz

4.25

4.00

3.75

3.50

3.25

3.00

5

10 15 20 25 30 35 40 45

INPUT VOLTAGE (V)

8611 G30

Bias Pin Current

12

VBIAS = 5V

10

VOUT = 5V

VIN = 12V

ILOAD = 1A

8

6

Switching Waveforms

IL

1A/DIV

VSW

5V/DIV

4

500ns/DIV

12VIN TO 5VOUT AT 1A

2

0

0

0.5

1

1.5

2

2.5

SWITCHING FREQUENCY (MHz)

8611 G31

Switching Waveforms

IL

200mA/DIV

8611 G32

VSW

5V/DIV

500µs/DIV

12VIN TO 5VOUT AT 10mA

VSYNC = 0V

8611 G33

Switching Waveforms

IL

1A/DIV

VSW

10V/DIV

500ns/DIV

36VIN TO 5VOUT AT 1A

Transient Response

ILOAD

1A/DIV

VOUT

100mV/DIV

8611 G34

50µs/DIV

0.5A TO 1.5A TRANSIENT

12VIN, 5VOUT

COUT = 47µF

Transient Response

ILOAD

1A/DIV

VOUT

200mV/DIV

8611 G35

50µs/DIV

0.5A TO 2.5A TRANSIENT

12VIN, 5VOUT

COUT = 47µF

8611 G36

8611f

7

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