June 2005
LMS1585A/LMS1587
5A and 3A Low Dropout Fast Response Regulators
General Description
Features
n Fast transient response
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.
n Available in Adjustable, 1.5V, and 3.3V versions
n Current limiting and thermal protection
n Commercial temp. range
n Industrial temp. range
n Line regulation
0˚C to 125˚C
−40˚C to 125˚C
0.005% (typical)
0.05% (typical)
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).
n Load regulation
n Direct replacement for LT 1585A/87
™
The LMS1585A/87 circuits include a zener trimmed bandgap
reference, current limiting and thermal shutdown.
Applications
™
n Pentium processor supplies
The LMS1585A/87 series are available in TO-220 and TO-
263 packages.
™
n PowerPC supplies
n Other microprocessor supplies
n 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
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