LT3973IMSE-3.3 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LT3973IMSE-3.3

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.

Maximum Load Current

1.6

1.4

TYPICAL

1.2

MINIMUM

1.0

0.8

0.6

0.4

0.2 FRONT PAGE APPLICATION

VOUT = 3.3V

0

5 10 15 20 25 30 35 40 45

INPUT VOLTAGE (V)

3973 G10

Maximum Load Current

1.5

TYPICAL

1.2

MINIMUM

0.9

0.6

0.3

FRONT PAGE APPLICATION

VOUT = 5V

0

5 10 15 20 25 30 35

INPUT VOLTAGE (V)

40 45

3973 G11

Maximum Load Current

1.4

LIMITED BY CURRENT LIMIT

1.2

H-GRADE

1.0

0.8

LIMITED BY MAXIMUM

JUNCTION TEMPERATURE;

0.6

θJA = 45°C/W

0.4

FRONT PAGE APPLICATION

0.2 VIN = 12V

VOUT = 5V

0

–50 –25 0 25 50 75

100 125 150

TEMPERATURE (°C)

3973 G12

Load Regulation

0.25

0.20

0.15

0.10

0.05

0

–0.05

–0.10

–0.15 FRONT PAGE APPLICATION

REFERENCED FROM VOUT AT 100mA LOAD

–0.20

0 100 200 300 400 500 600 700

LOAD CURRENT (mA)

3973 G13

Switch Current Limit

2.0

1.8

SWITCH PEAK

1.6

CURRENT LIMIT

1.4

1.2

CATCH DIODE VALLEY CURRENT LIMIT

1.0

0.8

0

20

40

60

80

100

DUTY CYCLE (%)

3973 G14

Switching Frequency

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

–50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

3973 G16

Minimum Switch On-Time

150

LOAD CURRENT = 375mA

125

100

75

50

25

0

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3973 G17

6

For more information www.linear.com/LT3973

Switch Current Limit

2.0

1.8

SWITCH PEAK CURRENT LIMIT

1.6

1.4

1.2 CATCH DIODE VALLEY CURRENT LIMIT

1.0

0.8

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3973 G15

Switch VCESAT (ISW = 500mA)

vs Temperature

350

300

250

200

–50 –25 0 25 50 75 100 125 150

TEMPERATURE (°C)

3973 G18

3973fb

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