AP1084

5A Low Dropout Positive Adjustable or Fixed-Mode Regulator

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Aug.27, 2004

2/8

Block Diagram

3

Thermal

Shutdown

1

2 Vout

Adj

1.25V

+

+

CURRENT

LIMIT

Vin

+

－

+

Connection Diagram

TO263

3

2

1

Vin

Vout

Adj (GND)

Tab is Vout

FRONT VIEW

TO252

3

2

1

Vin

Vout

Adj (GND)

Tab is Vout

FRONT VIEW

TO220

Tab is Vout

3

Vin

2

1

Vout

Adj (GND)

FRONT VIEW

Pin Descriptions

NAME

I/O

PIN #

FUNCTION

Adj (GND)

1

Adjustable (Ground only for fixed mode)

Vout

O

2

The output of the regulator. A minimum of 10uF capacitor must be

connected from this pin to ground to insure stability.

Vin

I

3

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 1.4V higher than Vout in order for the device to regulate

properly.