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LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators
June 2005
LMS1585A/LMS1587
5A and 3A Low Dropout Fast Response Regulators
General Description
The LMS1585A and LMS1587 are low dropout positive regu-
lators with output load current of 5A and 3A respectively.
Their low dropout voltage (1.2V) and fast transient response
make them an excellent solution for low voltage micropro-
cessor applications.
The LMS1585A/87 are available in adjustable versions,
which can set the output voltage with only two external
resistors. In addition, they are also available in 1.5V and
3.3V fixed voltage versions (Note 9).
The LMS1585A/87 circuits include a zener trimmed bandgap
reference, current limiting and thermal shutdown.
The LMS1585A/87 series are available in TO-220 and TO-
263 packages.
Features
n
n
n
n
n
n
n
n
Fast transient response
Available in Adjustable, 1.5V, and 3.3V versions
Current limiting and thermal protection
Commercial temp. range
0˚C to 125˚C
Industrial temp. range
−40˚C to 125˚C
Line regulation
0.005% (typical)
Load regulation
0.05% (typical)
Direct replacement for LT
™
1585A/87
Applications
n
n
n
n
Pentium
™
processor supplies
PowerPC
™
supplies
Other microprocessor supplies
Low voltage logic supplies
Typical Application
10119701
Connection Diagrams
TO-220
TO-263
10119736
Top View
10119735
Top View
LT is a registered trademark of Linear Technology Corporation
Pentium is a registered trademark of Intel Corporation
PowerPC is a registred trademark of IBM
© 2005 National Semiconductor Corporation
DS101197
www.national.com
LMS1585A/LMS1587
Ordering Information
Output
Current
3A
Package
TO-263
Temperature Range
0˚C to 125˚C
Part Number
LMS1587CS-ADJ
LMS1587CSX-ADJ
LMS1587CS-1.5
LMS1587CSX-1.5
LMS1587CS-3.3
LMS1587CSX-3.3
−40˚C to 125˚C
LMS1587IS-ADJ
LMS1587ISX-ADJ
LMS1587IS-1.5
LMS1587ISX-1.5
LMS1587IS-3.3
LMS1587ISX-3.3
TO-220
0˚C to 125˚C
LMS1587CT-ADJ
LMS1587CT-1.5
LMS1587CT-3.3
−40˚C to 125˚C
LMS1587IT-ADJ
LMS1587IT-1.5
LMS1587IT-3.3
5A
TO-263
0˚C to 125˚C
LMS1585ACS-ADJ
LMS1585ACSX-ADJ
LMS1585ACS-1.5
LMS1585ACSX-1.5
LMS1585ACS-3.3
LMS1585ACSX-3.3
−40˚C to 125˚C
LMS1585AIS-ADJ
LMS1585AISX-ADJ
LMS1585AIS-1.5
LMS1585AISX-1.5
LMS1585AIS-3.3
LMS1585AISX-3.3
TO-220
0˚C to 125˚C
LMS1585ACT-ADJ
LMS1585ACT-1.5
LMS1585ACT-3.3
−40˚C to 125˚C
LMS1585AIT-ADJ
LMS1585AIT-1.5
LMS1585AIT-3.3
Transport Media
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Rails
Rails
Rails
Rails
Rails
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Rails
Rails
Rails
Rails
Rails
T03B
TS3B
T03B
TS3B
NSC
Drawing
www.national.com
2
LMS1585A/LMS1587
Simplified Schematic
10119714
3
www.national.com
LMS1585A/LMS1587
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Input to Output Voltage
(V
IN
to GND)
13V
Power Dissipation (Note 2)
Junction Temperature (T
J
) (Note 2)
Storage Temperature Range
Lead Temperature
ESD Tolerance (Note 3)
Internally Limited
150˚C
-65˚C to 150˚C
260˚C, 10 sec
2000V
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, 0˚C to 125˚C for commercial grade and −40˚C to 125˚C for industrial grade.
Symbol
V
REF
Parameter
Reference Voltage
Conditions
LMS1585A-ADJ
V
IN
−V
OUT
= 3V, I
OUT
= 10mA
10mA
≤
I
OUT
≤
5A, 1.5V
≤
V
IN
−V
OUT
≤
5.75V
LMS1587-ADJ
10mA
≤
I
OUT
≤
3A, 1.5V
≤
V
IN
−V
OUT
≤
5.75V
V
OUT
Output Voltage
LMS1585A-1.5
I
OUT
= 0mA, V
IN
= 5V
0
≤
I
OUT
≤
5A, 3V
≤
V
IN
≤
7V
LMS1585A-3.3
I
OUT
= 0mA, V
IN
= 5V
0
≤
I
OUT
≤
5A, 4.75V
≤
V
IN
≤
7V
LMS1587-1.5
V
IN
= 5V, I
OUT
= 0mA, T
J
= 25˚C
0≤ I
OUT
≤
3A, 3V
≤
V
IN
≤
7V
LMS1587-3.3
0
≤
I
OUT
≤
3A, 4.75V
≤
V
IN
≤
7V
∆V
OUT
Line Regulation
(Note 6)
LMS1585A/87-ADJ
I
OUT
= 10mA, 2.75V
≤
V
IN
≤
7V
LMS1585A/87-3.3
I
OUT
= 0mA, 4.75V
≤
V
IN
≤
7V
LMS1585A/87-1.5
I
OUT
= 0mA, 3V
≤
V
IN
≤
7V
∆V
OUT
Load Regulation
(Note 6)
LMS1585A-ADJ
V
IN
−V
OUT
= 3V, 10mA
≤
I
OUT
≤
5A
LMS1585A-1.5/LMS1585A-3.3
V
IN
= 5V, 0
≤
I
OUT
≤
5A
LMS1587-ADJ
V
IN
−V
OUT
= 3V, 10mA
≤
I
OUT
≤
3A
LMS1587-1.5/LMS1587-3.3
V
IN
= 5V, 0
≤
I
OUT
≤
3A
V
IN
−V
OUT
Dropout Voltage
LMS1585A-ADJ/LMS1587-ADJ
∆V
REF
= 1%, I
OUT
= 3A
LMS1585A-3.3/LMS1587-3.3/
LMS1585A-1.5/LMS1587-1.5
∆V
OUT
= 1%, I
OUT
= 3A
LMS1585A-ADJ
∆V
REF
= 1%, I
OUT
= 5A
LMS1585A-1.5/LMS1585A-3.3
∆V
OUT
= 1%, I
OUT
= 5A
Min
(Note 5)
1.238
1.225
1.225
1.485
1.470
3.267
3.235
1.485
1.470
3.235
Typ
(Note 4)
1.25
1.250
1.250
1.500
Max
(Note 5)
1.262
1.275
1.275
1.515
1.530
3.333
3.365
1.515
1.530
3.365
0.2
0.2
0.2
0.3
0.5
0.3
0.5
0.3
0.5
0.3
0.5
1.3
Units
V
V
V
V
V
V
V
V
V
V
%
%
%
%
%
3.300
3.300
1.500
1.500
3.300
0.005
0.005
0.005
0.05
0.05
0.05
0.05
0.05
0.05
0.05
1.15
%
%
%
V
1.15
1.2
1.2
1.3
1.4
1.4
V
V
V
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