NSC LMS1587IT-3.3 5a and 3a low dropout fast response regulator Datasheet

LMS1585A/LMS1587
5A and 3A Low Dropout Fast Response Regulators
General Description
Features
The LMS1585A and LMS1587 are low dropout positive regulators 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 1.5V and
3.3V fixed voltage versions (Note 9).
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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.
Applications
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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
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
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LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators
June 2005
LMS1585A/LMS1587
Ordering Information
Output
Current
Package
3A
TO-263
Temperature Range
0˚C to 125˚C
−40˚C to 125˚C
TO-220
0˚C to 125˚C
−40˚C to 125˚C
5A
TO-263
0˚C to 125˚C
−40˚C to 125˚C
TO-220
0˚C to 125˚C
−40˚C to 125˚C
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Part Number
Transport Media
LMS1587CS-ADJ
Rails
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
LMS1587IS-ADJ
Rails
LMS1587ISX-ADJ
Tape and Reel
LMS1587IS-1.5
Rails
LMS1587ISX-1.5
Tape and Reel
LMS1587IS-3.3
Rails
LMS1587ISX-3.3
Tape and Reel
LMS1587CT-ADJ
Rails
LMS1587CT-1.5
Rails
LMS1587CT-3.3
Rails
LMS1587IT-ADJ
Rails
LMS1587IT-1.5
Rails
LMS1587IT-3.3
Rails
LMS1585ACS-ADJ
Rails
LMS1585ACSX-ADJ
Tape and Reel
LMS1585ACS-1.5
Rails
LMS1585ACSX-1.5
Tape and Reel
LMS1585ACS-3.3
Rails
LMS1585ACSX-3.3
Tape and Reel
LMS1585AIS-ADJ
Rails
LMS1585AISX-ADJ
Tape and Reel
LMS1585AIS-1.5
Rails
LMS1585AISX-1.5
Tape and Reel
LMS1585AIS-3.3
Rails
LMS1585AISX-3.3
Tape and Reel
LMS1585ACT-ADJ
Rails
LMS1585ACT-1.5
Rails
LMS1585ACT-3.3
Rails
LMS1585AIT-ADJ
Rails
LMS1585AIT-1.5
Rails
LMS1585AIT-3.3
Rails
2
NSC
Drawing
TS3B
T03B
TS3B
T03B
LMS1585A/LMS1587
Simplified Schematic
10119714
3
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LMS1585A/LMS1587
Absolute Maximum Ratings (Note 1)
Power Dissipation (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Maximum Input to Output Voltage
(VIN to GND)
Internally Limited
Junction Temperature (TJ) (Note 2)
150˚C
-65˚C to 150˚C
Lead Temperature
260˚C, 10 sec
ESD Tolerance (Note 3)
2000V
13V
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
VREF
VOUT
∆VOUT
∆VOUT
Parameter
Reference Voltage
Output Voltage
Line Regulation
(Note 6)
Load Regulation
(Note 6)
VIN−VOUT Dropout Voltage
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Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Units
LMS1585A-ADJ
VIN−VOUT = 3V, IOUT = 10mA
10mA ≤ IOUT ≤ 5A, 1.5V ≤ VIN−VOUT ≤ 5.75V
1.238
1.225
1.25
1.250
1.262
1.275
V
V
LMS1587-ADJ
10mA ≤ IOUT ≤ 3A, 1.5V ≤ VIN−VOUT ≤ 5.75V
1.225
1.250
1.275
V
LMS1585A-1.5
IOUT = 0mA, VIN = 5V
0 ≤ IOUT ≤ 5A, 3V ≤ VIN ≤ 7V
1.485
1.470
1.500
1.515
1.530
V
V
LMS1585A-3.3
IOUT = 0mA, VIN = 5V
0 ≤ IOUT ≤ 5A, 4.75V ≤ VIN ≤ 7V
3.267
3.235
3.300
3.300
3.333
3.365
V
V
LMS1587-1.5
VIN = 5V, IOUT = 0mA, TJ = 25˚C
0≤ IOUT ≤ 3A, 3V ≤ VIN ≤ 7V
1.485
1.470
1.500
1.500
1.515
1.530
V
V
LMS1587-3.3
0 ≤ IOUT ≤ 3A, 4.75V ≤ VIN ≤ 7V
3.235
3.300
3.365
V
LMS1585A/87-ADJ
IOUT = 10mA, 2.75V ≤ VIN ≤ 7V
0.005
0.2
%
LMS1585A/87-3.3
IOUT = 0mA, 4.75V ≤ VIN ≤ 7V
0.005
0.2
%
LMS1585A/87-1.5
IOUT = 0mA, 3V ≤ VIN ≤ 7V
0.005
0.2
%
LMS1585A-ADJ
VIN−VOUT = 3V, 10mA ≤ IOUT ≤ 5A
0.3
0.5
%
0.05
LMS1585A-1.5/LMS1585A-3.3
VIN = 5V, 0 ≤ IOUT ≤ 5A
0.05
0.05
0.3
0.5
%
LMS1587-ADJ
VIN−VOUT = 3V, 10mA ≤ IOUT ≤ 3A
0.05
0.05
0.3
0.5
%
LMS1587-1.5/LMS1587-3.3
VIN = 5V, 0 ≤ IOUT ≤ 3A
0.05
0.05
0.3
0.5
%
%
LMS1585A-ADJ/LMS1587-ADJ
∆VREF = 1%, IOUT = 3A
1.15
1.3
V
LMS1585A-3.3/LMS1587-3.3/
LMS1585A-1.5/LMS1587-1.5
∆VOUT = 1%, IOUT = 3A
1.15
1.3
V
LMS1585A-ADJ
∆VREF = 1%, IOUT = 5A
1.2
1.4
V
LMS1585A-1.5/LMS1585A-3.3
∆VOUT = 1%, IOUT = 5A
1.2
1.4
V
Conditions
4
(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
ILIMIT
Min
(Note 5)
Typ
(Note 4)
LMS1585A-ADJ/LMS1585A-3.3/LMS1585A-1.5
VIN−VOUT = 5.5V
5.0
6.6
A
LMS1587-ADJ/LMS1587-3.3/LMS1587-1.5
VIN−VOUT = 5.5V
3.1
4.3
A
Parameter
Current Limit
Conditions
Max
(Note 5)
Units
Minimum Load
Current (Note 7)
LMS1585A/87-ADJ
1.5V ≤ VIN−VOUT ≤ 5.75V
2.0
10.0
mA
Quiescent Current
LMS1585A-3.3/LMS1587-3.3/
LMS1585A-1.5/LMS1587-1.5
VIN = 5V
7.0
13.0
mA
Thermal Regulation
TA = 25˚C, 30ms Pulse
Ripple Rejection
LMS1585A-ADJ
fRIPPLE = 120Hz, VIN−VOUT = 3V,
IOUT = 5A, COUT = 25µF Tantalum
LMS1585A-1.5
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 5A, VIN = 4.5V
72
dB
72
dB
72
dB
LMS1587-ADJ
fRIPPLE = 120Hz, VIN−VOUT = 3V, IOUT = 3A
COUT = 25µF Tantalum
72
dB
72
dB
72
dB
LMS1587-3.3
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 3A, VIN = 6.3V
Adjust Pin Current
Adjust Pin Current
%/W
LMS1585A-3.3
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 5A, VIN = 6.3V
LMS1587-1.5
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 3A, VIN = 4.5V
60
0.003
60
55
10mA ≤ IOUT ≤ IFULLLOAD,
1.5V ≤ VIN−VOUT ≤ 5.75V (Note 8)
Temperature Stability
120
µA
0.2
µA
0.5
%
Long Term Stability
TA = 125˚C, 1000Hrs
0.03
%
RMS Output Noise
(% of VOUT)
10Hz ≤ f ≤ 10kHz
0.003
%
Thermal Resistance
Junction-to-Case
3-Lead TO-263: Control/Output Section
3-Lead TO-220: Control/Output Section
0.65/2.7
0.65/2.7
˚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: 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
dissipation 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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LMS1585A/LMS1587
Electrical Characteristics
LMS1585A/LMS1587
Application Note
OUTPUT VOLTAGE
The adjustable version develops at 1.25V reference voltage,
(VREF), between the output and the adjust terminal. As
shown in Figure 1, this voltage is applied across resistor R1
to generate a constant current I1. This constant current then
flows through R2. The resulting voltage drop across R2 adds
to the reference voltage to sets the desired output voltage.
The current IADJ from the adjustment terminal introduces an
output error. But since it is small (120µA max), it becomes
negligible when R1 is in the 100Ω range.
For fixed voltage devices, R1 and R2 are integrated inside
the devices.
10119772
FIGURE 1. Basic Adjustable Regulator
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6
LMS1585A/LMS1587
Physical Dimensions
inches (millimeters)
unless otherwise noted
3-Pin TO-263
NS Package Number TS3B
3-Pin TO-220
NS Package Number T03B
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LMS1585A/LMS1587 5A Low Dropout Fast Response Regulators
Notes
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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