3

LT1930/LT1930A

TYPICAL PERFOR A CE CHARACTERISTICS

Quiescent Current

FB Pin Voltage

SHDN Pin Current

Current Limit

Switch Saturation Voltage

Oscillator Frequency

SW (Pin 1): Switch Pin. Connect inductor/diode here.

Minimize trace area at this pin to reduce EMI.

GND (Pin 2): Ground. Tie directly to local ground plane.

FB (Pin 3): Feedback Pin. Reference voltage is 1.255V.

Connect resistive divider tap here. Minimize trace area at

PI FU CTIO S

SHDN (Pin 4): Shutdown Pin. Tie to 2.4V or more to enable

device. Ground to shut down.

TEMPERATURE (

°C)

–50

–25

50

75

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

3.0

1930/A G01

0

25

100

NOT SWITCHING

LT1930A

LT1930

TEMPERATURE (

°C)

–50

1.22

1.23

1.24

1.25

1.26

1.28

–25

025

50

1930/A G02

75

100

1.27

SHDN PIN VOLTAGE (V)

0

20

30

40

3

5

1930/A G03

10

0

–10

12

4

50

60

70

80

90

6

LT1930A

LT1930

DUTY CYCLE (%)

10

0.8

1.2

1930/A G04

0.4

0

30

20

50

40

70

60

90

80

1.6

0.6

1.0

0.2

1.4

SWITCH CURRENT (A)

0

0

0.05

0.15

0.20

0.25

0.8

0.45

1930/A G05

0.10

0.4

1.2

0.6

0.2

1.0

0.30

0.35

0.40

TEMPERATURE (

°C)

–50

–25

0

2.5

2.3

2.1

1.9

1.7

1.5

1.3

1.1

0.9

0.7

0.5

25

50

75

100

1930/A G06

LT1930

LT1930A