LT3971IDDPBF datasheet(6/24 Pages) LINER

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LT3971

3971f

TYPICAL PERFORMANCE CHARACTERISTICS

EN Threshold

Boost Diode Forward Voltage

Power Good Threshold

Switching Waveforms;

Burst Mode Operation

Switching Waveforms; Full

Frequency Continuous Operation

Minimum Input Voltage

TA = 25°C, unless otherwise noted.

Transient Load Response,

Load Current Stepped from 25mA

(Burst Mode Operation) to 525mA

Transient Load Response,

Load Current Stepped from

0.5A to 1A

TEMPERATURE (°C)

3971 G21

1.05

0.97

0.96

1.03

1.02

1.01

1.00

0.99

0.98

1.04

0.95

–55

155

125

–25

RISING THRESHOLD

FALLING THRESHOLD

BOOST DIODE CURRENT (mA)

3971 G22

1.6

0.4

0.2

1.2

1.0

0.8

0.6

1.4

1500

500

750

1250

1000

250

TEMPERATURE (°C)

3971 G23

–55

155

125

–25

10μs/DIV

3971 G24

VOUT

100mV/DIV

500mA/DIV

FRONT PAGE APPLICATION

VIN = 12V, VOUT = 3.3V

COUT = 47μF

10μs/DIV

3971 G25

VOUT

100mV/

DIV

500mA/

DIV

FRONT PAGE APPLICATION

VIN = 12V, VOUT = 3.3V

COUT = 47μF

5μs/DIV

3971 G26

VSW

5V/DIV

VOUT

20mV/DIV

500mA/DIV

FRONT PAGE APPLICATION

VIN = 12V, VOUT = 3.3V

ILOAD = 10mA

COUT = 22μF

1μs/DIV

3971 G27

VSW

5V/DIV

VOUT

20mV/DIV

500mA/DIV

FRONT PAGE APPLICATION

VIN = 12V, VOUT = 3.3V

ILOAD = 1A

COUT = 22μF

Minimum Input Voltage

LOAD CURRENT (mA)

5.0

4.8

4.0

3.4

3.6

4.2

4.4

4.6

3.8

3.2

3.0

800

400

3971 G19

1200

600

200

1000

TO START

TO RUN

FRONT PAGE APPLICATION

VOUT = 3.3V

LOAD CURRENT (mA)

6.4

6.2

5.4

5.6

6.0

5.8

5.2

5.0

800

400

3971 G20

1200

600

200

1000

TO START

TO RUN

FRONT PAGE APPLICATION

VOUT = 5V

LT3971IDDPBF Datasheet(PDF) 6 Page - Linear Technology

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