Datasheet LMS1587IT-ADJ, LMS1587IT-3.3, LMS1587ISX-3.3, LMS1587IS-ADJ, LMS1587IS-3.3 Datasheet (NSC)

LMS1585A/LMS1587
5A and 3A Low Dropout Fast Response Regulators

LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators

April 2000

General Description

The LMS1585AandLMS1587arelowdropoutpositiveregu­lators 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 micropro­cessor 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 a 3.3V fixed volt­age version (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 TO­263 packages.

Typical Application

Features

n Fast transient response
n Available in Adjustable, 1.5V, and 3.3V versions
n Current limiting and thermal protection
n Commercial temp. range 0˚C to 125˚C
n Industrial temp. range −40˚C to 125˚C
n Line regulation 0.005% (typical)
n Load regulation 0.05% (typical)
n Direct replacement for LT

™

1585A/87

Applications

n Pentium™processor supplies
n PowerPC
n Other 2.5V to 3.6V microprocessor supplies
n Low voltage logic supplies

™

supplies

Connection Diagrams

TO-220

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

DS101197-1

TO-263

DS101197-36

DS101197-35

Top View

© 2000 National Semiconductor Corporation DS101197 www.national.com

Ordering Information

Output
Current

3A TO-263 0˚C to 125˚C LMS1587CS-ADJ Rails

LMS1585A/LMS1587

5A TO-263 0˚C to 125˚C LMS1585ACS-ADJ Rails

Package Temperature Range Part Number Transport Media NSC

LMS1587CSX-ADJ Tape and Reel

LMS1587CS-1.5 Rails

LMS1587CSX-1.5 Tape and Reel

LMS1587CS-3.3 Rails

LMS1587CSX-3.3 Tape and Reel

−40˚C to 125˚C LMS1587IS-ADJ Rails
LMS1587ISX-ADJ Tape and Reel

LMS1587IS-3.3 Rails

LMS1587ISX-3.3 Tape and Reel

TO-220 0˚C to 125˚C LMS1587CT-ADJ Rails

LMS1587CT-3.3 Rails

−40˚C to 125˚C LMS1587IT-ADJ Rails

LMS1587IT-3.3 Rails

LMS1585ACSX-ADJ Tape and Reel

LMS1585ACS-3.3 Rails

LMS1585ACSX-3.3 Tape and Reel

−40˚C to 125˚C LMS1585AIS-ADJ Rails

LMS1585AISX-ADJ Tape and Reel

LMS1585AIS-3.3 Rails

LMS1585AISX-3.3 Tape and Reel

TO-220 0˚C to 125˚C LMS1585ACT-ADJ Rails

LMS1585ACT-3.3 Rails

−40˚C to 125˚C LMS1585AIT-ADJ Rails

LMS1585AIT-3.3 Rails

Drawing

TS3B

T03B

TS3B

T03B

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Simplified Schematic

LMS1585A/LMS1587

DS101197-14

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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

to GND) 13V

IN

Power Dissipation (Note 2) Internally Limited
Junction Temperature (T

)(Note 2) 150˚C

J

Storage Temperature Range -65˚C to 150˚C
Lead Temperature 260˚C, 10 sec
ESD Tolerance (Note 3) 2000V

LMS1585A/LMS1587

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, 0˚C to 125˚C for commercial grade and −40˚C to 125˚C for industrial grade.

Symbol Parameter Conditions

V

REF

Reference Voltage LMS1585A-ADJ

V

IN−VOUT

10mA ≤ I

= 3V, I

≤ 5A, 1.5V ≤ VIN−V

OUT

OUT

= 10mA

LMS1587-ADJ
10mA ≤ I

V

OUT

Output Voltage LMS1585A-3.3

= 0mA, VIN=5V

I

OUT

0≤I

OUT

≤ 3A, 1.5V ≤ VIN−V

OUT

≤ 5A, 4.75V ≤ VIN≤ 7V

LMS1587-1.5
V

IN

0≤ I

= 5V, I

OUT

= 0mA, TJ= 25˚C

OUT

≤ 3A, 3V ≤ VIN≤ 7V

LMS1587-3.3

∆V

OUT

Line Regulation
(Note 6)

0 ≤ I
LMS1585A/87-ADJ

I

OUT

≤ 3A, 4.75V ≤ VIN≤ 7V 3.235 3.300 3.365 V

OUT

= 10mA, 2.75V ≤ VIN≤ 7V 0.005 0.2 %

LMS1585A/87-3.3
I

= 0mA, 4.75V ≤ VIN≤ 7V 0.005 0.2 %

OUT

LMS1587-1.5
I

= 0mA, 3V ≤ VIN≤ 7V 0.005 0.2 %

OUT

∆V

OUT

Load Regulation
(Note 6)

LMS1585A-ADJ
V

IN−VOUT

= 3V, 10mA ≤ I

LMS1585A-3.3
V

= 5V, 0 ≤ I

IN

OUT

≤ 5A

LMS1587-ADJ
V

IN−VOUT

= 3V, 10mA ≤ I

LMS1587-1.5
V

= 5V, 0 ≤ I

IN

OUT

≤ 3A

LMS1587-3.3
V

V

IN−VOUT

= 5V, 0 ≤ I

IN

Dropout Voltage LMS1585A-ADJ/LMS1587-ADJ

= 1%, I

∆V

REF

≤ 3A

OUT

= 3A 1.15 1.3 V

OUT

LMS1585A-3.3/LMS1587-3.3/LMS1587-1.5
∆V

OUT

= 1%, I

= 3A 1.15 1.3 V

OUT

LMS1585A-ADJ
∆V

REF

= 1%, I

= 5A 1.2 1.4 V

OUT

LMS1585A-3.3
∆V

I

LIMIT

= 1%, I

OUT

Current Limit LMS1585A-ADJ/LMS1585A-3.3

V

IN−VOUT

= 5.5V 5.0 6.6 A

= 5A 1.2 1.4 V

OUT

LMS1587-ADJ/LMS1587-3.3
V

IN−VOUT

= 5.5V 3.1 4.3 A

LMS1587-1.5
V

IN−VOUT

= 5.5V 3.100 3.750 A

OUT

OUT

Min

(Note

5)

1.238

≤ 5.75V

OUT

≤ 5.75V 1.225 1.250 1.275 V

OUT

1.225

3.267

3.235

1.485

1.470

≤ 5A

≤ 3A

Typ

(Note

4)

1.25

1.250

3.300

3.300

1.500

1.500

0.05

0.05

0.05

0.05

0.05

0.05

0.05

0.05

0.05

0.05

Max

(Note5)Units

1.262

1.275

3.333

3.365

1.515

1.530

V
V

V
V

V
V

0.3

0.5 %

0.3

0.5 %

0.3

0.5 %

0.3

0.5

%
%

0.3

0.5 %

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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, 0˚C to 125˚C for commercial grade and −40˚C to 125˚C for industrial grade.

Symbol Parameter Conditions

(Note

5)

Min

Minimum Load
Current (Note 7)

LMS1585A/87-ADJ

1.5V ≤ V

IN−VOUT

≤ 5.75V 2.0 10.0 mA

Quiescent Current LMS1585A-3.3/LMS1587-3.3/LMS1587-1.5

V

= 5V 7.0 13.0 mA

IN

Thermal Regulation T

= 25˚C, 30ms Pulse 0.003 %/W

A

Ripple Rejection LMS1585A-ADJ

f

= 120Hz, VIN−V

RIPPLE

= 25µF Tantalum 72 dB

C

OUT

OUT

= 3V, I

OUT

=5A

LMS1585-3.3
f

= 120Hz, C

RIPPLE

= 5A, VIN= 6.3V 72 dB

I

OUT

= 25µF Tantalum,

OUT

LMS1587-ADJ
f

= 120Hz, VIN−V

RIPPLE

= 25µF Tantalum 72 dB

C

OUT

OUT

= 3V, I

OUT

=3A

LMS1587-1.5
f

= 120Hz, C

RIPPLE

= 3A, VIN= 4.5V 60 72 dB

I

OUT

= 25µF Tantalum,

OUT

LMS1587-3.3
f

= 120Hz, C

RIPPLE

= 3A, VIN= 6.3V 72 dB

I

OUT

= 25µF Tantalum,

OUT

Adjust Pin Current 55 120 µA
Adjust Pin Current 10mA ≤ I

1.5V ≤ V

≤ I

OUT

IN−VOUT

FULLLOAD

,

≤ 5.75V (Note 8) 0.2 µA

Temperature Stability 0.5 %
Long Term Stability T
RMS Output Noise

(% of V

OUT

)

Thermal Resistance
Junction-to-Case

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: The maximum power dissipation is a function of T

=(T

is P

D

J(max)–TA

Note 3: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.
Note 4: Typical Values represent the most likely parametric norm.
Note 5: All limits are guaranteed by testing or statistical analysis.
Note 6: Load and line regulation are measured at constant junction temperature, and are guaranteed up to the maximum power dissipation of 30W. Power dissipa-

tion is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.

Note 7: The minimum output current required to maintain regulation.
Note 8: I

FULLLOAD

Note 9: Consult factory for other fixed voltage options.

)/θJA. All numbers apply for packages soldered directly into a PC board.

is 5A for LMS1585A and 3A for LMS1587.

= 125˚C, 1000Hrs 0.03 %

A

10Hz ≤ f ≤ 10kHz 0.003 %

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

, θJA, and TA. The maximum allowable power dissipation at any ambient temperature

J(max)

Typ

(Note

4)

Max

(Note5)Units

0.65/2.7

0.65/2.7

˚C/W
˚C/W

LMS1585A/LMS1587

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Physical Dimensions inches (millimeters) unless otherwise noted

LMS1585A/LMS1587

3-Lead TO-263 Package

NSC Package Number TS3B

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators

3-Lead TO-220 Package

NSC Package Number T03B

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