LT3973 데이터 시트보기 (PDF) - Linear Technology

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LT3973

42V, 750mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes

Linear Technology 

LT3973/LT3973-3.3/LT3973-5

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

Switch VCESAT

600

500

400

300

200

100

0

0 200 400 600 800 1000 1200

SWITCH CURRENT (mA)

3973 G19

Minimum Input Voltage,

VOUT = 5V

6.5

FRONT PAGE APPLICATION

VOUT = 5V

6.0

5.5

TO START/TO RUN

5.0

4.5

4.0

0

100 200 300 400 500 600 700

LOAD CURRENT (mA)

3973 G22

BOOST Pin Current

25

20

15

10

5

0

0 200 400 600 800 1000 1200

SWITCH CURRENT (mA)

3973 G20

Start-Up and Dropout

Performance

9

FRONT PAGE APPLICATION

8

7

VIN

6

5

VOUT

4

3

2

1

0

TIME

3973 G23

Minimum Input Voltage,

VOUT = 3.3V

5.0

FRONT PAGE APPLICATION

VOUT = 3.3V

4.5

4.0

TO START/TO RUN

3.5

3.0

2.5

0

100 200 300 400 500 600 700

LOAD CURRENT (mA)

3973 G21

Minimum Input Voltage to Switch

4.0

3.5

3.0

2.5

2.0

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3973 G24

VFB Regulation Voltage

1.4

1.2

1.0

0.8

0.6

2.0

2.5 3.0 3.5 4.0 4.5 5.0

INPUT VOLTAGE (V)

3973 G25

Boost Diode Forward Voltage

1.2

1.0

0.8

0.6

0.4

0.2

0

0

150°C

125°C

25°C

–50°C

50

100

150

200

BOOST DIODE CURRENT (mA)

3973 G26

For more information www.linear.com/LT3973

Catch Diode Forward Voltage

1.0

0.8

0.6

0.4

0.2

0

0

150°C

125°C

25°C

–50°C

200 400 600 800 1000 1200

CATCH DIODE CURRENT (mA)

3973 G27

3973fb

7

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