LT3483

5

3483fb

PIN FUNCTIONS

FB (Pin 1/Pin 3): Feedback. Place resistor to negative

GND (Pins 2, 3/Pin 2): Ground. For DFN package, tie both

pin 2 and pin 3 together to ground.

SW (Pin 4/Pin 1): Switch. Connect to external inductor

L1 and positive terminal of transfer capacitor.

with 1μF or greater.

NC (Pin 6/NA): No Connection.

D (Pin 7/Pin 5): Anode Terminal of Integrated Schottky

Diode. Connect to negative terminal of transfer capaci-

tor and external inductor L2 (flyback configuration) or

to cathode of external Schottky diode (inverting charge

pump configuration).

SHDN (Pin 8/Pin 4): Shutdown. Connect to GND to turn

device off. Connect to supply to turn device on.

Exposed Pad (Pin 9/NA): GND. The exposed pad should

be soldered to the PCB ground to achieve the rated thermal

performance.

(DFN/TSOT-23)

BLOCK DIAGRAM

–

+

–

+

6

3

1

2

5

A3

300ns

DELAY

1.250V

REFERENCE

S

Q1

20mV

SW

D

L1B

L1A

0.1Ω

0.1Ω

GND

3483 BD

–

+

25mV

D1

Q

RQ

A1

A2

125k

R1

R2

D

D2

FB

OPTIONAL CHARGE PUMP CONFIGURATION.

L1B REPLACED WITH:

PIN NUMBERS CORRESPOND TO THE

6-PIN TSOT-23 PACKAGE

••