LMS1585ACSX-ADJ [NSC]
5A and 3A Low Dropout Fast Response Regulators; 5A和3A低压降快速响应稳压器
| 型号： | LMS1585ACSX-ADJ |
| 厂家： | 
National Semiconductor |
| 描述： | 5A and 3A Low Dropout Fast Response Regulators |
| 文件： | 总8页 (文件大小：514K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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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Ordering Information
Output
Current
3A
Package
Temperature Range
Part Number
Transport Media
NSC
Drawing
TO-263
0˚C to 125˚C
LMS1587CS-ADJ
LMS1587CSX-ADJ
LMS1587CS-1.5
LMS1587CSX-1.5
LMS1587CS-3.3
LMS1587CSX-3.3
LMS1587IS-ADJ
LMS1587ISX-ADJ
LMS1587IS-1.5
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
TS3B
T03B
TS3B
T03B
−40˚C to 125˚C
Tape and Reel
Rails
LMS1587ISX-1.5
LMS1587IS-3.3
Tape and Reel
Rails
LMS1587ISX-3.3
LMS1587CT-ADJ
LMS1587CT-1.5
LMS1587CT-3.3
LMS1587IT-ADJ
LMS1587IT-1.5
Tape and Reel
Rails
TO-220
TO-263
0˚C to 125˚C
−40˚C to 125˚C
0˚C to 125˚C
Rails
Rails
Rails
Rails
LMS1587IT-3.3
Rails
5A
LMS1585ACS-ADJ
LMS1585ACSX-ADJ
LMS1585ACS-1.5
LMS1585ACSX-1.5
LMS1585ACS-3.3
LMS1585ACSX-3.3
LMS1585AIS-ADJ
LMS1585AISX-ADJ
LMS1585AIS-1.5
LMS1585AISX-1.5
LMS1585AIS-3.3
LMS1585AISX-3.3
LMS1585ACT-ADJ
LMS1585ACT-1.5
LMS1585ACT-3.3
LMS1585AIT-ADJ
LMS1585AIT-1.5
LMS1585AIT-3.3
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
−40˚C to 125˚C
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
TO-220
0˚C to 125˚C
Rails
Rails
−40˚C to 125˚C
Rails
Rails
Rails
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2
Simplified Schematic
10119714
3
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Absolute Maximum Ratings (Note 1)
Power Dissipation (Note 2)
Junction Temperature (TJ) (Note 2)
Storage Temperature Range
Lead Temperature
Internally Limited
150˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
-65˚C to 150˚C
260˚C, 10 sec
2000V
Maximum Input to Output Voltage
ESD Tolerance (Note 3)
(VIN to GND)
13V
Electrical Characteristics
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.
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Symbol
Parameter
Conditions
Units
VREF
Reference Voltage
LMS1585A-ADJ
VIN−VOUT = 3V, IOUT = 10mA
10mA ≤ IOUT ≤ 5A, 1.5V ≤ VIN−VOUT ≤ 5.75V
LMS1587-ADJ
1.238
1.25
1.262
V
V
1.225
1.250
1.275
10mA ≤ IOUT ≤ 3A, 1.5V ≤ VIN−VOUT ≤ 5.75V
LMS1585A-1.5
1.225
1.250
1.500
1.275
V
VOUT
Output Voltage
IOUT = 0mA, VIN = 5V
1.485
1.515
V
V
0 ≤ IOUT ≤ 5A, 3V ≤ VIN ≤ 7V
LMS1585A-3.3
1.470
1.530
IOUT = 0mA, VIN = 5V
3.267
3.300
3.300
3.333
V
V
0 ≤ IOUT ≤ 5A, 4.75V ≤ VIN ≤ 7V
LMS1587-1.5
3.235
3.365
VIN = 5V, IOUT = 0mA, TJ = 25˚C
0≤ IOUT ≤ 3A, 3V ≤ VIN ≤ 7V
LMS1587-3.3
1.485
1.500
1.500
1.515
V
V
1.470
1.530
0 ≤ IOUT ≤ 3A, 4.75V ≤ VIN ≤ 7V
LMS1585A/87-ADJ
3.235
3.300
0.005
0.005
0.005
3.365
0.2
V
%
%
∆VOUT
Line Regulation
(Note 6)
IOUT = 10mA, 2.75V ≤ VIN ≤ 7V
LMS1585A/87-3.3
IOUT = 0mA, 4.75V ≤ VIN ≤ 7V
LMS1585A/87-1.5
0.2
IOUT = 0mA, 3V ≤ VIN ≤ 7V
LMS1585A-ADJ
0.2
0.3
0.5
0.3
0.5
0.3
0.5
0.3
0.5
%
%
∆VOUT
Load Regulation
(Note 6)
VIN−VOUT = 3V, 10mA ≤ IOUT ≤ 5A
LMS1585A-1.5/LMS1585A-3.3
VIN = 5V, 0 ≤ IOUT ≤ 5A
LMS1587-ADJ
0.05
0.05
0.05
0.05
0.05
0.05
0.05
%
VIN−VOUT = 3V, 10mA ≤ IOUT ≤ 3A
LMS1587-1.5/LMS1587-3.3
VIN = 5V, 0 ≤ IOUT ≤ 3A
LMS1585A-ADJ/LMS1587-ADJ
∆VREF = 1%, IOUT = 3A
LMS1585A-3.3/LMS1587-3.3/
LMS1585A-1.5/LMS1587-1.5
∆VOUT = 1%, IOUT = 3A
LMS1585A-ADJ
%
%
%
V
IN−VOUT Dropout Voltage
1.15
1.3
V
1.15
1.2
1.3
1.4
1.4
V
V
V
∆VREF = 1%, IOUT = 5A
LMS1585A-1.5/LMS1585A-3.3
∆VOUT = 1%, IOUT = 5A
1.2
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4
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.
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Symbol
Parameter
Current Limit
Conditions
Units
ILIMIT
LMS1585A-ADJ/LMS1585A-3.3/LMS1585A-1.5
VIN−VOUT = 5.5V
5.0
3.1
6.6
4.3
2.0
A
A
LMS1587-ADJ/LMS1587-3.3/LMS1587-1.5
VIN−VOUT = 5.5V
Minimum Load
LMS1585A/87-ADJ
Current (Note 7)
Quiescent Current
1.5V ≤ VIN−VOUT ≤ 5.75V
LMS1585A-3.3/LMS1587-3.3/
LMS1585A-1.5/LMS1587-1.5
VIN = 5V
10.0
13.0
mA
7.0
mA
Thermal Regulation
Ripple Rejection
TA = 25˚C, 30ms Pulse
0.003
%/W
LMS1585A-ADJ
fRIPPLE = 120Hz, VIN−VOUT = 3V,
IOUT = 5A, COUT = 25µF Tantalum
LMS1585A-1.5
72
72
72
72
72
dB
dB
dB
dB
dB
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 5A, VIN = 4.5V
60
LMS1585A-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
60
LMS1587-3.3
fRIPPLE = 120Hz, COUT = 25µF Tantalum,
IOUT = 3A, VIN = 6.3V
72
55
dB
µA
Adjust Pin Current
Adjust Pin Current
120
10mA ≤ IOUT ≤ IFULLLOAD
,
1.5V ≤ VIN−VOUT ≤ 5.75V (Note 8)
0.2
0.5
µA
%
%
%
Temperature Stability
Long Term Stability
RMS Output Noise
TA = 125˚C, 1000Hrs
0.03
0.003
10Hz ≤ f ≤ 10kHz
(% of VOUT
)
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 T
, θ , and T . The maximum allowable power dissipation at any ambient temperature
JA A
J(max)
is P = (T
–T )/θ . All numbers apply for packages soldered directly into a PC board.
D
J(max)
A JA
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: I
is 5A for LMS1585A and 3A for LMS1587.
FULLLOAD
Note 9: Consult factory for other fixed voltage options.
5
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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
Physical Dimensions inches (millimeters)
unless otherwise noted
3-Pin TO-263
NS Package Number TS3B
3-Pin TO-220
NS Package Number T03B
7
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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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