LT3483IDC 데이터 시트보기 (PDF) - Linear Technology

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LT3483IDC

Inverting Micropower DC/DC Converters with Schottky

Linear Technology 

LT3483/LT3483A

PIN FUNCTIONS (DFN/TSOT-23)

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

output here. Set resistor value R1 = VOUT/10µA.

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.

VIN (Pin 5/Pin 6): Input Supply. Must be locally bypassed

with 1µF or greater.

NC (Pin 6/NA): No Internal 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.

BLOCK DIAGRAM

1.250V

REFERENCE

125k

R1

FB

VOUT

3

+

A3

–

OPTIONAL CHARGE PUMP CONFIGURATION.

L1B REPLACED WITH:

D2 R2

D

VOUT

L1A

L1B

VIN

•

CFLY

•

VOUT

COUT

6

VIN

300ns

DELAY

SQ

RQ

1

5

SW

D

Q1

D1

25mV

A1

0.1Ω

0.1Ω

20mV

(LT3483)

+

A2

–

GND

2

PIN NUMBERS CORRESPOND TO THE

6-PIN TSOT-23 PACKAGE

3483 BD

3483fc

5

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