LT3663

5

3663fc

For more information For more information www.linear.com/LT3663

Typical perForMance characTerisTics

BOOST Pin Current

SWITCH CURRENT (A)

35

30

25

20

3653 G07

0

5

15

10

0

0.2

0.4

0.5

0.8

1.0

1.2

DIODE CURRENT (mA)

1.4

1.2

1

0.8

3653 G09

0

0.2

0.6

0.4

0

50

100

150

200

250

300

SWITCH CURRENT (A)

400

350

3663 G01

0

50

100

150

200

250

300

0

0.2

0.4

0.6

0.8

1

1.2

125°C

–45°C

25°C

Switch Voltage Drop

pin FuncTions

BOOST: The BOOST pin is used to provide a drive voltage,

higher than the input voltage, to the internal power switch.

The BOOST pin is also internally connected to the cathode

of the BOOST diode.

GND (Exposed Pad Pin 9) : Ground. The exposed pad

must be soldered to the PCB and electrically connected

to ground. Use a large ground plane and thermal vias to

optimize thermal performance.

FB (LT3663): The LT3663 regulates the FB pin to 0.8V.

Connect the feedback resistor divider tap to this pin.

to ground to program the regulator output current limit.

the anode to the internal BOOST diode.

RUN: The Run pin is used to put the LT3663 into shutdown

mode. Tie to ground to shut down the LT3663. Tie to 2.5V

or more for normal operation. If the shutdown feature is

SW: The SW pin is the output of the internal power switch.

Connect this pin to the inductor, catch diode and boost

capacitor.

regulator and internal power switch. Capacitively bypass

the pin to ground.

of the internal output current limit sense resistor.

the positive terminal of the output capacitor.