National Semiconductor LM1086 Technical data

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LM1086

1.5A Low Dropout Positive Regulators

LM1086 1.5A Low Dropout Positive Regulators

June 2005

General Description

The LM1086 is a series of low dropout positive voltage
regulators with a maximum dropout of 1.5V at 1.5A of load
current. It has the same pin-out as National Semiconductor’s
industry standard LM317.

The LM1086 is available in an adjustable version, which can
set the output voltage with only two external resistors. It is
also available in six fixed voltages: 1.8V, 2.5V, 2.85V, 3.3V,

3.45V and 5.0V. The fixed versions integrate the adjust
resistors.

The LM1086 circuit includes a zener trimmed bandgap ref­erence, current limiting and thermal shutdown.

The LM1086 series is available in TO-220, TO-263, and LLP
packages. Refer to the LM1084 for the 5A version, and the
LM1085 for the 3A version.

Connection Diagrams

TO-220 TO-263 LLP

10094802

Top View

Features

n Available in 1.8V, 2.5V, 2.85V, 3.3V, 3.45V, 5V and

Adjustable Versions

n Current Limiting and Thermal Protection
n Output Current 1.5A
n Line Regulation 0.015% (typical)
n Load Regulation 0.1% (typical)

Applications

n SCSI-2 Active Terminator
n High Efficiency Linear Regulators
n Battery Charger
n Post Regulation for Switching Supplies
n Constant Current Regulator
n Microprocessor Supply

Basic Functional Diagram, Adjustable Version

10094865

Top View

10094804

10094866

Pins 6, 7, and 8 must be tied together.

Top View

Application Circuit

10094852

1.2V to 15V Adjustable Regulator

© 2005 National Semiconductor Corporation DS100948 www.national.com

Ordering Information

LM1086

3-lead TO-263 −40˚C to +125˚C LM1086IS-ADJ Rails

3-lead TO-220 −40˚C to +125˚C LM1086IT-ADJ Rails

8-Lead LLP −40˚C to +125˚C LM1086ILD-ADJ Rails

Package Temperature Range Part Number Transport Media NSC Drawing

LM1086ISX-ADJ Tape and Reel

LM1086IS-1.8 Rails

LM1086ISX-1.8 Tape and Reel

LM1086IS-2.85 Rails

LM1086ISX-2.85 Tape and Reel

LM1086IS-3.3 Rails

LM1086ISX-3.3 Tape and Reel

LM1086IS-3.45 Rails

LM1086ISX-3.45 Tape and Reel

LM1086IS-5.0 Rails

LM1086ISX-5.0 Tape and Reel

0˚C to +125˚C LM1086CS-ADJ Rails

LM1086CSX-ADJ Tape and Reel

LM1086CS-2.5 Rails

LM1086CSX-2.5 Tape and Reel

LM1086CS-2.85 Rails

LM1086CSX-2.85 Tape and Reel

LM1086CS-3.3 Rails

LM1086CSX-3.3 Tape and Reel

LM1086CS-5.0 Rails

LM1086CSX-5.0 Tape and Reel

LM1086IT-1.8 Rails

LM1086IT-2.85 Rails

LM1086IT-3.3 Rails

LM1086IT-5.0 Rails

0˚C to +125˚C LM1086CT-ADJ Rails

LM1086CT-2.85 Rails

LM1086CT-3.3 Rails

LM1086CT-5.0 Rails

LM1086ILDX-ADJ Tape and Reel

LM1086ILD-1.8 Rails

LM1086ILDX-1.8 Tape and Reel

LM1086ILD-2.5 Rails

LM1086ILDX-2.5 Tape and Reel

LM1086ILD-2.85 Rails

LM1086ILDX-2.85 Tape and Reel

LM1086ILD-3.3 Rails

LM1086ILDX-3.3 Tape and Reel

LM1086ILD-5.0 Rails

LM1086ILDX-5.0 Tape and Reel

TS3B

T03B

LDC008AA

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Simplified Schematic

LM1086

10094834

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

LM1086

please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Maximum Input-to-Output Voltage Differential

Storage Temperature Range -65˚C to 150˚C

Lead Temperature 260˚C, to 10 sec

ESD Tolerance (Note 4) 2000V

Operating Ratings (Note 1)

LM1086-ADJ 29V

LM1086-1.8 27V

LM1086-2.5 27V

LM1086-2.85 27V

LM1086-3.3 27V

LM1086-3.45 27V

LM1086-5.0 25V

Power Dissipation (Note 2) Internally Limited

Junction Temperature (T

)(Note 3) 150˚C

J

Junction Temperature Range (T

"C" Grade

Control Section 0˚C to 125˚C

Output Section 0˚C to 150˚C

"I" Grade

Control Section −40˚C to 125˚C

Output Section −40˚C to 150˚C

) (Note 3)

J

Electrical Characteristics

Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation.

Symbol Parameter Conditions

V

REF

V

OUT

Reference Voltage LM1086-ADJ

= 10mA, VIN−V

I

OUT

Output Voltage
(Note 7)

10mA ≤I

1.5V ≤ V

LM1086-1.8
I
0 ≤ I

OUT

IN−VOUT

= 0mA, VIN=5V

OUT

≤ I

OUT

≤ I

FULL LOAD

≤ 15V (Note 7)

FULL LOAD

=3V

OUT

,

, 3.3V ≤ VIN≤ 18V

LM1086-2.5

= 0mA, VIN=5V

I

OUT

0 ≤ I

OUT

≤ I

FULL LOAD

, 4.0V ≤ VIN≤ 18V

LM1086-2.85

= 0mA, VIN=5V

I

OUT

0 ≤ I

OUT

≤ I

FULL LOAD

, 4.35V ≤ VIN≤ 18V

LM1086-3.3
I

= 0mA, VIN=5V

OUT

0 ≤ I

OUT

≤ I

FULL LOAD

, 4.75V ≤ VIN≤ 18V

LM1086-3.45
I

= 0mA, VIN=5V

OUT

0 ≤ I

OUT

≤ I

FULL LOAD

, 4.95V ≤ VIN≤ 18V

LM1086-5.0

= 0mA, VIN=8V

I

OUT

∆V

OUT

Line Regulation
(Note 8)

OUT

≤ I

FULL LOAD

0 ≤ I

LM1086-ADJ

=10mA, 1.5V≤ (VIN-V

I

OUT

, 6.5V ≤ VIN≤ 20V

LM1086-1.8

= 0mA, 3.3V ≤ VIN≤ 18V

I

OUT

LM1086-2.5

= 0mA, 4.0V ≤ VIN≤ 18V

I

OUT

OUT

Min

(Note 6)

1.238

1.225

1.782

1.764

2.475

2.450

2.82

2.79

3.267

3.235

3.415

3.381

4.950

4.900

) ≤ 15V

Typ

(Note 5)

1.250

1.250

1.8

1.8

2.50

2.50

2.85

2.85

3.300

3.300

3.45

3.45

5.000

5.000

0.015

0.035

0.3

0.6

0.3

0.6

Max

(Note 6)

1.262

1.270

1.818

1.836

2.525

2.55

2.88

2.91

3.333

3.365

3.484

3.519

5.050

5.100

0.2

0.2

Units

V
V

V

V

V
V

V
V

V
V

V
V

%
%

6
6 mV

6
6 mV

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Electrical Characteristics (Continued)

Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation.

Symbol Parameter Conditions

LM1086-2.85

= 0mA, 4.35V ≤ VIN≤ 18V

I

OUT

LM1086-3.3

= 0mA, 4.5V ≤ VIN≤ 18V

I

OUT

LM1086-3.45
I

= 0mA, 4.95V ≤ VIN≤ 18V

OUT

LM1086-5.0

= 0mA, 6.5V ≤ VIN≤ 20V

I

OUT

∆V

OUT

Load Regulation
(Note 8)

LM1086-ADJ
(V

IN-VOUT

) = 3V, 10mA ≤ I

LM1086-1.8 ,2.5, 2.85

= 5V, 0 ≤ I

V

IN

OUT

≤ I

FULL LOAD

LM1086-3.3, 3.45

= 5V, 0 ≤ I

V

IN

OUT

≤ I

FULL LOAD

LM1086-5.0

I

LIMIT

= 8V, 0 ≤ I

V

IN

Dropout Voltage
(Note 9)

LM1086-ADJ, 1.8, 2.5,2.85, 3.3, 3.45, 5

, ∆V

∆V

REF

OUT

Current Limit LM1086-ADJ

V

IN−VOUT

V

IN−VOUT

=5V
= 25V

≤ I

OUT

= 1%, I

FULL LOAD

OUT

LM1086-1.8,2.5, 2.85, 3.3, 3.45, V

LM1086-5.0, V

Minimum Load Current
(Note 10)

LM1086-ADJ
VIN−V

OUT

Quiescent Current LM1086-1.8, 2.5, 2.85, V

LM1086-3.3, V

LM1086-3.45, V

LM1086-5.0, V

Thermal Regulation T

Ripple Rejection f

= 25˚C, 30ms Pulse 0.008 0.04 %/W

A

= 120Hz, C

RIPPLE

= 1.5A

I

OUT

LM1086-1.8, 2.5, 2.85, V

LM1086-3.3, V

LM1086-3.45, V

LM1086-5.0 V

= 10V 1.5 2.7 A

IN

= 25V 5.0 10.0 mA

IN

≤ 18V 5.0 10.0 mA

IN

≤ 18V 5.0 10.0 mA

IN

≤ 20V 5.0 10.0 mA

IN

= 25µF Tantalum,

OUT

= 25µF, (VIN−VO)=3V

ADJ

IN

= 6.3V 60 72 dB

IN

= 6.3V 60 72 dB

IN

=8V 60 68 dB

IN

Adjust Pin Current LM1086 55 120 µA

Adjust Pin Current
Change

10mA ≤ I

1.5V ≤ (V

≤ I

OUT

IN−VOUT

FULL LOAD

) ≤ 15V 0.2 5 µA

Temperature Stability 0.5 %

Long Term Stability T

RMS Noise
(% of V

θ

Thermal Resistance

JC

OUT

)

Junction-to-Case

= 125˚C, 1000Hrs 0.3 1.0 %

A

10Hz ≤ f≤ 10kHz 0.003 %

3-Lead TO-263: Control Section/Output
Section
3-Lead TO-220: Control Section/Output
Section

Min

(Note 6)

≤ I

OUT

FULL LOAD

= 1.5A

1.50

0.05

=8V 1.5 2.7 A

IN

≤ 18V 5.0 10.0 mA

60 75 dBLM1086-ADJ, C

=6V 60 72 dB

,

Typ

(Note 5)

0.3

0.6

0.5

1.0

0.5

1.0

0.5

1.0

0.1

0.2

3

6

3

7

5

10

Max

(Note 6)

6

6

10

10

10

10

10

10

0.3

0.4

12

20

15

25

20

35

1.3 1.5 V

2.7

0.15

1.5/4.0

1.5/4.0

LM1086

Units

mV
mV

mV
mV

mV
mV

mV
mV

%
%

mV
mV

mV
mV

mV
mV

A
A

˚C/W
˚C/W

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