AP1184

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1184 Rev. 4

2 of 12

MARCH 2008

www.diodes.com

Pin Assignments

TO263-L

Tab is Vout

FRONT VIEW

3

2

1

Vout

Vsense

Adj(GND)

Vctrl

Vin

4

5

TO220-5L

Tab is Vout

FRONT VIEW

Vout

Vsense

Adj(GND)

Vctrl

Vin

5

2

1

4

3

Pin Numbers with standard type are for TO220-5L, TO263-5L packages.

Name

I/O

Description

Adj

(GND)

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

only for fixed mode)

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.

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.

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 be higher than the Vout pin in order to regulate the

device. A minimum of 100uF capacitor must be connected from this pin to ground to

insure stability.

NC

No connection

Vout

O

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

pin to ground to insure stability.

Pin Descriptions