AP1118

1A Positive Low Dropout Fixed-Mode Regulator With EN Function

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Feb. 15, 2005

2/10

Connection Diagram

SOP-8L

Vout

GND

( Top View )

2

1

3

EN

Vin

4

5

Vout

7

Vout

Vout

6

8

Vout

5 PIN TO252/TO263

5

3

1

Vin

Vout

GND

Tab is Vout

( Top View )

2

4

EN

NC

5 PIN TO220

Tab is Vout

Vin

Vout

GND

5

3

1

2

4EN

NC

Pin Descriptions

NAME

FUNCTION

GND

Ground.

Vout

The output of the regulator. A minimum of 10uF capacitor must be connected from this pin

to ground to insure stability.

Vin

The input pin of regulator. Typically a large storage capacitor is connected from this pin to

ground to insure that the input voltage does not sag below the minimum dropout voltage

during the load transient response. This pin must always be 1.3V higher than Vout in order

for the device to regulate properly.

EN

The input pin of regulator. TTL/CMOS compatible input Logic high = disable output, Logic

Low or open = output enable. (internal pull-down resistor~100 K).

NC

No connection.