G5E1284

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ISSUED DATE :2005/05/24

REVISED DATE :2006/03/29B

G

4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator

Description

The G5E1284 is 4A regulator with extremely low dropout voltage. This product is specifically designed to

provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies

where high efficiency of the switch can be achieved without the cost and complexity associated with switching

regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply.

Features

&Built-in thermal shutdown

&Output current limiting

&Adjustable or fixed output voltage 1.5V,1.8V,2.5V,3.3V,5.0V

&Fast transient response

&Good noise rejection

Package Dimensions

Millimeter

Millimeter

REF.

Min.

Max.

REF.

Min.

Max.

A

4.40

4.80

L5

6.20

6.60

b

0.76

1.00

c1

1.25

1.45

c

0.36

0.50

L

13.25

14.25

D

8.60

9.00

e

1.70 REF.

E

9.80

10.4

L1

2.60

2.89

L4

14.7

15.3

Ø

3.71

3.96

Typical Application

Block Diagram

Pin Descriptions

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

The 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 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 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 by higher than the Vout pin in order the device to regulate. A minimum of 100uF capacitor

must be connected from this pin to ground to insure stability.

Vout

O

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

insure stability.

G5E1284-25