3

LT3463/LT3463A

3463f

TYPICAL PERFOR A CE CHARACTERISTICS

PI FU CTIO S

cathode of an internal Schottky diode whose anode is

connected to the SW1 pin.

SW1 (Pin 2): Switch Pin for Switcher 1. This is the

collector of the internal NPN switch. Minimize the metal

trace area connected to this pin to minimize EMI.

capacitor as close to the device as possible.

SW2 (Pin 4): Switch Pin for Switcher 2. This is the

collector of the internal NPN switch. Minimize the metal

trace area connected to this pin to minimize EMI.

D2 (Pin 5): Diode for Switcher 2. This is the anode of an

internal Schottky diode whose cathode connected to the

GND pin.

FB2 (Pin 6): Feedback Pin for Switcher 2. Set the output

voltage by selecting values for R3 and R4.

used along with FB2 to set the negative output voltage for

Switcher 2.

SHDN2 (Pin 8): Shutdown Pin for Switcher 2. Pull this pin

above 1.5V to enable Switcher 2. Pull below 0.3V to turn

it off. Do not leave this pin floating.

Switch Off Time

Switch Current Limit

Quiescent Current

900

800

700

600

500

400

300

200

100

0

3463 G01

TEMPERATURE (

°C)

–50

100

050

–25

25

75

125

FOR BOTH SWITCHERS

1.27

1.26

1.25

1.24

1.23

1.22

3463 G02

TEMPERATURE (

°C)

–50

100

050

–25

25

75

125

10

8

6

4

2

0

3463 G03

TEMPERATURE (

°C)

–50

25

75

–25

0

50

100

125

TEMPERATURE (

°C)

–50

100

3463 G04

050

400

350

300

250

200

150

100

50

0

–25

25

75

125

TEMPERATURE (

°C)

–50

100

3463 G05

050

450

400

350

300

250

200

150

100

50

0

–25

25

75

125

LT3463 SW1, SW2

LT3463A SW1

LT3463A SW2

TEMPERATURE (

°C)

–50

60

50

40

30

20

10

0

25

75

3463 G06

–25

0

50

100

125

NOT SWITCHING