LT1944 datasheet(4/28 Pages) LINER

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LT3580

3580fg

TYPICAL PERFORMANCE CHARACTERISTICS

Switch Current Limit at 1MHz

Switch Saturation Voltage

Switch Current Limit at Minimum

Duty Cycle

Switch Current Limit at Minimum

Duty Cycle

Positive Feedback Voltage

Switching Waveforms for

Figure 14 Circuit

Oscillator Frequency

Oscillator Frequency During

Soft-Start

Internal UVLO

TA = 25°C unless otherwise specified

DUTY CYCLE (%)

0.5

1.0

1.5

2.0

3580 G01

2.5

SWITCH CURRENT (A)

200

250

300

3580 G02

150

100

0.5

1.5

400

350

SS VOLTAGE (mV)

0.5

1.0

1.5

2.0

200

400

600

800

3580 G03

1000

1200

2.5

TEMPERATURE (°C)

–50

0.5

1.0

1.5

2.0

2.5

3.0

100

3580 G04

TEMPERATURE (°C)

–50

–25

1.19

1.21

1.24

3580 G05

1.20

1.23

1.22

100

125

VOUT

50mV/DIV

AC COUPLED

VSW

10V/DIV

0.5A/DIV

200ns/DIV

3580 G06

TEMPERATURE (°C)

–50

1.9

2.1

2.3

3580 G07

1.7

1.5

1.1

100

1.3

2.7

RT = 35.7k

2.5

RT = 75k

FB VOLTAGE (V)

1/4

1/2

TA = –35°C

TA = 25°C

TA = 100°C

1/3

0.2

0.4

INVERTING

CONFIGURATIONS

BOOSTING

CONFIGURATIONS

0.6

0.8

3580 G08

1.0

1.2

TEMPERATURE (°C)

–50

2.20

2.22

2.26

2.28

2.30

2.40

2.34

3580 G09

2.24

2.36

2.38

2.32

100

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