LM1086.PDF
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LM1086 1.5A Low Dropout Positive Regulators
December 2000
LM1086
1.5A Low Dropout Positive Regulators
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 five fixed voltages: 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 ref-
erence, current limiting and thermal shutdown.
The LM1086 series is available in TO-220 and TO-263 pack-
ages. Refer to the LM1084 for the 5A version, and the
LM1085 for the 3A version.
Features
n
Available in 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
Connection Diagrams
TO-220
TO-263
DS100948-2
Top View
DS100948-4
Top View
Basic Functional Diagram, Adjustable Version
Application Circuit
DS100948-65
DS100948-52
1.2V to 15V Adjustable Regulator
© 2000 National Semiconductor Corporation
DS100948
www.national.com
Ordering Information
Package
Temperature Range
Part Number
Transport Media
NSC Drawing
3-lead TO-263
−40˚C to +125˚C
LM1086IS-ADJ
Rails
LM1086ISX-ADJ
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
TS3B
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
3-lead TO-220
−40˚C to +125˚C
LM1086IT-ADJ
Rails
LM1086IT-2.85
Rails
LM1086IT-3.3
Rails
LM1086IT-5.0
Rails
T03B
0˚C to +125˚C
LM1086CT-ADJ
Rails
LM1086CT-2.85
Rails
LM1086CT-3.3
Rails
LM1086CT-5.0
Rails
www.national.com
2
Simplified Schematic
DS100948-34
3
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
-65˚C to 150˚C
Lead Temperature
260˚C, to 10 sec
ESD Tolerance (Note 4)
2000V
Maximum Input-to-Output Voltage Differential
LM1086-ADJ
Operating Ratings
(Note 1)
29V
Junction Temperature Range (T
J
) (Note 3)
²
LM1086-2.5
27V
C
Grade
Control Section
LM1086-2.85
27V
0˚C to 125˚C
LM1086-3.3
27V
Output Section
0˚C to 150˚C
LM1086-3.45
27V
²
²
Grade
Control Section
LM1086-5.0
25V
−40˚C to 125˚C
Power Dissipation (Note 2)
Internally Limited
Output Section
−40˚C to 150˚C
Junction Temperature (T
J
)(Note 3)
150˚C
Electrical Characteristics
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in
Boldface
type apply over the entire junc-
tion temperature range for operation.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
V
REF
Reference Voltage
LM1086-ADJ
I
OUT
= 10mA, V
IN
−V
OUT
=3V
10mA
£
I
OUT
£
I
FULL LOAD
,
1.238
1.225
1.250
1.250
1.262
1.270
V
V
1.5V
£
V
IN
−V
OUT
£
15V (Note 7)
V
OUT
Output Voltage
(Note 7)
LM1086-2.5
I
OUT
= 0mA, V
IN
=5V
0
2.475
2.450
2.50
2.50
2.525
2.55
V
£
I
OUT
£
I
FULL LOAD
, 4.0V
£
V
IN
£
18V
LM1086-2.85
I
OUT
= 0mA, V
IN
=5V
0
£
I
OUT
£
I
FULL LOAD
, 4.35V
£
V
IN
£
18V
2.82
2.79
2.85
2.85
2.88
2.91
V
V
LM1086-3.3
I
OUT
= 0mA, V
IN
=5V
0
I
OUT
£
I
FULL LOAD
, 4.75V
£
V
IN
£
18V
3.267
3.235
3.300
3.300
3.333
3.365
V
V
LM1086-3.45
I
OUT
= 0mA, V
IN
=5V
0
I
OUT
£
I
FULL LOAD
, 4.95V
£
V
IN
£
18V
3.415
3.381
3.45
3.45
3.484
3.519
V
V
LM1086-5.0
I
OUT
= 0mA, V
IN
=8V
0
I
OUT
£
I
FULL LOAD
, 6.5V
£
V
IN
£
20V
4.950
4.900
5.000
5.000
5.050
5.100
V
V
D
V
OUT
Line Regulation
(Note 8)
LM1086-ADJ
I
OUT
=10mA, 1.5V
0.015
0.035
0.2
0.2
%
%
£
(V
IN
-V
OUT
)
£
15V
LM1086-2.5
I
OUT
= 0mA, 4.0V
£
V
IN
£
18V
0.3
0.6
6
6
mV
LM1086-2.85
I
OUT
= 0mA, 4.35V
£
V
IN
£
18V
0.3
0.6
6
6
mV
mV
LM1086-3.3
I
OUT
= 0mA, 4.5V
£
V
IN
£
18V
0.5
1.0
10
10
mV
mV
LM1086-3.45
I
OUT
= 0mA, 4.95V
£
V
IN
£
18V
0.5
1.0
10
10
mV
mV
LM1086-5.0
I
OUT
= 0mA, 6.5V
£
V
IN
£
20V
0.5
1.0
10
10
mV
mV
www.national.com
4
²
I
£
£
£
Electrical Characteristics
(Continued)
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in
Boldface
type apply over the entire junc-
tion temperature range for operation.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
D
V
OUT
Load Regulation
(Note 8)
LM1086-ADJ
(V
IN
-V
OUT
) = 3V, 10mA
£
I
OUT
0.1
0.2
0.3
0.4
%
%
£
I
FULL LOAD
LM1086-2.5/2.85
V
IN
= 5V, 0
£
I
OUT
£
I
FULL LOAD
3
6
12
20
mV
mV
LM1086-3.3/3.45
V
IN
= 5V, 0
£
I
OUT
£
I
FULL LOAD
3
7
15
25
mV
mV
LM1086-5.0
V
IN
= 8V, 0
£
I
OUT
£
I
FULL LOAD
5
10
20
35
mV
mV
Dropout Voltage
(Note 9)
LM1086-2.5/2.85/3.3/3.45/5/ADJ
D
V
REF
= 1%, I
OUT
= 1.5A
1.3
1.5
V
I
LIMIT
Current Limit
LM1086-ADJ
V
IN
−V
OUT
=5V
V
IN
−V
OUT
= 25V
1.50
0.05
2.7
0.15
A
A
LM1086-2.5, V
IN
=8V
1.5
2.7
A
LM1086-2.85, V
IN
=8V
1.5
2.7
A
LM1086-3.3, V
IN
=8V
1.5
2.7
A
LM1086-3.45, V
IN
=8V
1.5
2.7
A
LM1086-5.0, V
IN
= 10V
1.5
2.7
A
Minimum Load Current
(Note 10)
LM1086-ADJ
V
IN
−V
OUT
= 25V
5.0
10.0
mA
Quiescent Current
LM1086-2.5, V
IN
£
18V
5.0
10.0
mA
LM1086-2.85, V
IN
£
18V
5.0
10.0
mA
LM1086-3.3, V
IN
£
18V
5.0
10.0
mA
LM1086-3.45, V
IN
£
18V
5.0
10.0
mA
LM1086-5.0, V
IN
£
20V
5.0
10.0
mA
Thermal Regulation
T
A
= 25˚C, 30ms Pulse
0.008
0.04
%/W
Ripple Rejection
f
RIPPLE
= 120Hz, C
OUT
= 25µF Tantalum,
I
OUT
= 1.5A
LM1086-ADJ, C
ADJ
= 25µF, (V
IN
−V
O
)=3V
LM1086-2.5, V
IN
=6V
60
75
dB
60
72
dB
LM1086-2.85, V
IN
=6V
60
72
dB
LM1086-3.3, V
IN
= 6.3V
60
72
dB
LM1086-3.45, V
IN
= 6.3V
60
72
dB
LM1086-5.0 V
IN
=8V
60
68
dB
Adjust Pin Current
LM1086
55
120
µA
Adjust Pin Current
Change
10mA
£
I
OUT
£
I
FULL LOAD
,
1.5V
£
(V
IN
−V
OUT
)
£
15V
0.2
5
µA
Temperature Stability
0.5
%
Long Term Stability
T
A
= 125˚C, 1000Hrs
0.3
1.0
%
RMS Noise
(% of V
OUT
)
10Hz
£
f
£
10kHz
0.003
%
q
JC
Thermal Resistance
Junction-to-Case
3-Lead TO-263: Control Section/Output
Section
3-Lead TO-220: Control Section/Output
Section
1.5/4.0
1.5/4.0
˚C/W
˚C/W
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2:
Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application Notes.
Note 3:
The maximum power dissipation is a function of T
J(max)
,
q
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature
JA
. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.
Note 4:
For testing purposes, ESD was applied using human body model, 1.5k
q
W
in series with 100pF.
5
www.national.com
is P
D
=(T
J(max)
–T
A
)/
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