AP1186

1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1186 Rev. 1

2 of 9

MARCH 2007

www.diodes.com

Block Diagram

THERMAL

SHUTDOWN

Vout

Adj

1.25V

+

CURRENT

LIMIT

Vin

+

-

+

+

Vsense

Vctrl

Package Connect Diagram

5 PIN TO263

5 PIN TO220

Tab is Vout

FRONT VIEW

Tab is Vout

FRONT VIEW

Vout

Vsense

Adj(GND)

Vctrl

Vin

5

2

1

4

3

3

2

1

Vout

Vsense

Adj(GND)

Vctrl

Vin

4

5

Pin Descriptions

Name

I/O

Description

Vsense

I

This pin is the positive side of the reference that allows remote load sensing to achieve excellent load

regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability.

Adj

(GND)

A resistor divider from this pin to the Vout pin and ground sets the output voltage.

(GND only for fixed mode)

Vout

O

The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground

to insure stability.

Vctrl

I

This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor.

This pin must always by higher than the Vout pin in order for the device to regulate. A minimum of

100uF capacitor must be connected from this pin to ground to insure stability.

Vin

I

The input of the 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 higher than Vout in order for the device to regulate.