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PDF LMS1585A Data sheet ( Hoja de datos )
| Número de pieza | LMS1585A | |
| Descripción | 5A and 3A Low Dropout Fast Response Regulators | |
| Fabricantes | National Semiconductor | |
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April 2000
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 resis-
tors. In addition, they are also available in a 3.3V fixed volt-
age 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 TO-
263 packages.
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™ supplies
n Other 2.5V to 3.6V microprocessor supplies
n Low voltage logic supplies
Typical Application
Connection Diagrams
TO-220
Top View
DS101197-36
DS101197-1
TO-263
DS101197-35
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
© 2000 National Semiconductor Corporation DS101197
www.national.com
1 page  
Electrical Characteristics (Continued)
Typicals and limits appearing in normal type apply for TJ = 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
Parameter
Conditions
Min
(Note
5)
Typ
(Note
4)
Max
(Note
5)
Units
Minimum Load
Current (Note 7)
Quiescent Current
Thermal Regulation
Ripple Rejection
Adjust Pin Current
LMS1585A/87-ADJ
1.5V ≤ VIN−VOUT ≤ 5.75V
LMS1585A-3.3/LMS1587-3.3/LMS1587-1.5
VIN = 5V
TA = 25˚C, 30ms Pulse
LMS1585A-ADJ
fRIPPLE = 120Hz, VIN−VOUT = 3V, IOUT = 5A
COUT = 25µF Tantalum
LMS1585-3.3
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 5A, VIN = 6.3V
LMS1587-ADJ
fRIPPLE = 120Hz, VIN−VOUT = 3V, IOUT = 3A
COUT = 25µF Tantalum
LMS1587-1.5
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 3A, VIN = 4.5V
LMS1587-3.3
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 3A, VIN = 6.3V
2.0 10.0 mA
7.0 13.0 mA
0.003
%/W
72 dB
72 dB
72 dB
60 72
dB
72 dB
55 120 µA
Adjust Pin Current
Temperature Stability
10mA ≤ IOUT ≤ IFULLLOAD,
1.5V ≤ VIN−VOUT ≤ 5.75V (Note 8)
0.2 µA
0.5 %
Long Term Stability
RMS Output Noise
(% of VOUT)
Thermal Resistance
Junction-to-Case
TA = 125˚C, 1000Hrs
10Hz ≤ f ≤ 10kHz
3-Lead TO-263: Control/Output Section
3-Lead TO-220: Control/Output Section
0.03
0.003
%
%
0.65/2.7 ˚C/W
0.65/2.7 ˚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 in-
tended 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 TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature
is PD = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board.
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: IFULLLOAD is 5A for LMS1585A and 3A for LMS1587.
Note 9: Consult factory for other fixed voltage options.
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