NIKO L1084S, L1084, L1084T, L1084S3, L1084D Datasheet

NIKO-SEM

5A Adjustable Low Dropout

Linear Regulator (LDO)

GENERAL DESCRIPTION

FEATURES

L1084

TO-252, 263, 220

The L1084 is a positive and low dropout
three-terminal voltage regulator with 5A out­put current capability. This device is design­ed for use in low voltage applications that
offers lower dropout voltage and faster tran­sient response.

This device is fully protected against over
current faults, over temperature operation,
reversed input polarity, reversed lead insert­ion, transient voltage spike …etc.

On-Chips trimming the reference voltage to
1% and features the low dropout of maxi­mum 1.45 volts.

The L1084 Series regulators are available
in the popular industry standard TO-220,
TO-263 and TO-252 packages.

TYPICAL APPLICATION

z Very easy to use, it requires only two
external resistors to set the output voltage
z Low dropout voltage:

1.2V typical at up to 5A

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

Vin

Cin

10uF

L1084

IN

+

ADJ

Iadj

OUT

Vref

R1

R2

+

Vout

Cout

10uF

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

MAY-31-2001

NIKO-SEM

5A Adjustable Low Dropout

Linear Regulator (LDO)

ABSOLUTE MAXIMUM RATINGS

z Maximum Supply Voltage 7V

z Power Dissipation

z Thermal Resistance

Junction to Case, θJC
z Thermal Resistance
Junction to Ambient, θ
TO-220
TO-263
TO-252

JA

Internally

Limited

2.5 °C/W

50 °C/W
60 °C/W
70 °C/W

z Operating Junction
Temperature Range
z Storage Temperature
Range

z Lead Temperature
(Soldering, 10 Seconds)

L1084

TO-252, 263, 220

0 to 125 °C

-40 to 150 °C

260 °C

ELECTRICAL CHARACTERISTICS (Unless otherwise specified, T

= 25 °C.)

A

Parameter Symbol Test Conditions Typical Limits

Reference Voltage V

Dropout Voltage VD
Line Regulation REG
Load Regulation REG

Minimum Load
Current

Adjust Pin Current I
Current Limit ICL VIN - V

RMS Output Noise VN

Ripple Rejection
Ratio

VIN = 5V, I

REF

ΔV
(V

(LINE)

(V

(LOAD)

IO

ADJ

1.5V ≤ (V

0.003%

RA

f = 120Hz, C
V

= 1%, I

REF

+ 1.5V) ≤ V

OUT

IN -VOUT

OUT

= 5V, I

IN

= 10mA 1.25V

OUT

= 5A

OUT

≤ 7V, I

IN

) = 3V, 10mA ≤ I

IN -VOUT

) ≤ 5.75V

= 10mA

OUT

≤ 5A

OUT

1.2V 1.45V

0.5% 2%

0.5% 2.5%

10mA

55µA 100µA

= 2V 7.5A 5.0A (Min)

OUT

= 22µF for ADJ pin,

ADJ

= 5A

of V

72dB 60dB (Min)

OUT

DEVICE SELECTION GUIDE

Device

L1084D L1084S L1084S3 L1084T

1.23V

1.27V

Min

Max

Package

Marking

TO-252 TO-263 (2-Lead) TO-263 (3-Lead) TO-220

L1084D L1084S L1084S3 L1084T

2

MAY-31-2001

NIKO-SEM

5A Adjustable Low Dropout

Linear Regulator (LDO)

TO-252, 263, 220

L1084

Typical Performance Characteristics

Vout=3.3V,Vin=5V,Iout=105mA/5A

Cin=10μF,Cout=10μF

3

MAY-31-2001