3

LT1615/LT1615-1

sn16151 16151fas

TYPICAL PERFOR A CE CHARACTERISTICS

Switch Saturation Voltage

Quiescent Current

Feedback Pin Voltage and

Bias Current

TEMPERATURE (

°C)

–50

–25

0

25

50

75

100

1615/-1 G01

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

TEMPERATURE (

°C)

–50

1615/-1 G02

1.25

1.24

1.23

1.22

1.21

1.20

50

40

30

20

10

0

CURRENT

VOLTAGE

–25

0

25

50

75

100

TEMPERATURE (

°C)

1615/-1 G03

25

23

21

19

17

15

–50

–25

0

25

50

75

100

NOT SWITCHING

PI FU CTIO S

SW (Pin 1): Switch Pin. This is the collector of the internal

NPN power switch. Minimize the metal trace area con-

nected to this pin to minimize EMI.

GND (Pin 2): Ground. Tie this pin directly to the local

ground plane.

FB (Pin 3): Feedback Pin. Set the output voltage by

selecting values for R1 and R2 (see Figure 1):

RR

12

123

1

=−









.

SHDN (Pin 4): Shutdown Pin. Tie this pin to 0.9V or higher

to enable the device. Tie below 0.25V to turn off the device.

capacitor as close to the device as possible.

TEMPERATURE (

°C)

1615/-1 G04

550

500

450

400

350

300

250

–50

–25

0

25

50

75

100

TEMPERATURE (

°C)

1615/-1 G05

400

350

300

250

200

150

100

50

0

–50

–25

0

25

50

75

100

LT1615-1

LT1615

SHUTDOWN PIN VOLTAGE (V)

1615/-1 G03

25

20

15

10

5

0

0

5

10

15

25

°C

100

°C

Switch Off Time

Shutdown Pin Current

Switch Current Limit