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L1085DG

3A Adjustable Low Dropout Linear Regulator (LDO)

Niko Semiconductor 

NIKO-SEM

3A Adjustable Low Dropout

Linear Regulator (LDO)

L1085XG

TO-252,263,220

Lead-Free

GENERAL DESCRIPTION

The L1085G is a positive and low dropout

three-terminal voltage regulator with 3A out-

put current capability. This device is design-

ed for use in low voltage applications that

offers lower dropout voltage and faster tran-

sient response.

This device is fully protected against over

current faults, over temperature operation,

reversed input polarity, reversed lead insert-

ion, transient voltage spike …etc.

On-Chips trimming the reference voltage to

1% and features the low dropout of maxi-

mum 1.45 volts.

The L1085G Series regulators are available

in the popular industry standard TO-220

TO-263 and TO-252 packages.

FEATURES

z Very easy to use, it requires only two

external resistors to set the output voltage

z Low dropout voltage:

1.3V typical at up to 3A

z Low ground current

z Fast transient response

z Current & thermal limiting

z Line regulation: 0.5% typical

z Load regulation: 0.5% typical

z TO-220, TO-263 and TO-252 packages

APPLICATIONS

z High current microprocessor supplies

z Low voltage logic supply

z Powering VGA & sound card

z Portable instrumentation

z Constant current regulator

z Post regulator for switching power supply

TYPICAL APPLICATION

Vin

Cin

+

10uF

L1085

IN

OUT

ADJ

Vref

Iadj

Vout

R1

Cout

+

10uF

R2

Vo = Vref (1+R2/R1) + Iadj x R2

1. Cin needed if device is far from from filter capacitors.

2. Cout required for stability.

- Basic Adjustable Regulator Circuit -

1

JUL-15-2004

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