UC3552

CMOS IC

UNISONIC TECHNOLOGIES CO., LTD

2 of 7

www.unisonic.com.tw

QW-R502-134.C

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M ARK I N G

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PI N CON FI GU RAT I ON

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PI N DESCRI PT I ON

PIN NO. PIN NAME

I/O

DESCRIPTION

1

EO

I

Compensation pin for Error Amplifier

2

IN

I

Feedback pin with a typical reference voltage of 1.24V

3

SHDN

I

Shutdown control pin. The device will turn off when SHDN is low

4

GND

Ground

5

SW

O

Switch pin

6

Power supply pin

7

FREQ

I

Frequency select pin. Switch oscillator frequency to 640kHz when FREQ is low, and

1.3MHz when FREQ is high

8

SS

I

Soft-Start control pin. No soft-start when the pin is left open