SC220(2012) 데이터 시트보기 (PDF) - Semtech Corporation

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SC220
(Rev.:2012)

20MHz, 650mA, X-EMI™-Enabled Synchronous Step-Down Regulator

Semtech Corporation 

SC220

Pin Descriptions

Pin # Pin Name Pin Function

1

SW

Switching output node — connect to the output LC filter.

2

PVIN Power input supply voltage (2.7V to 5.5V).

3

VOUT Input for sensing the output of LC filter.

Input for regulation of output LC filter — Using R and R to set the output voltage, V = V x (1+ R /R ). (Please refer

4

FB

1

2

OUT FB

12

to the typical application circuit diagram on page 1).

Enable Input — when low, circuit draws <1μA. Apply a square wave clock at EN to synchronize the switching frequency

5

EN

with an external clock. It is recommended that the externally applied clock frequency should not be above 20MHz.

6

AVIN Input supply voltage.

7

AGND Analog ground.

8

PGND Power ground.

Block Diagram

EN 8

REF

1.0V

OSC

Therm al

S hutdow n

E xternal Freq .

S ynchronization

20 M H z

F re q u e n c y

C ontrol

AVIN

7

S oft-S tart

C LIM

1 .0 V

+

E rror

FB 1

Amp

-

+

C om p

-

C ontrol Logic

D river

ZCD

PVIN

3

4 SW

6

AGND

C om pensator

5

PGND

2 VOUT

5

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