LMS8117AMP-1.8/NOPB [TI]
1A Low-Dropout Linear Regulator;型号: | LMS8117AMP-1.8/NOPB |
厂家: | TEXAS INSTRUMENTS |
描述: | 1A Low-Dropout Linear Regulator 光电二极管 输出元件 调节器 |
文件: | 总18页 (文件大小:758K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LMS8117A
LMS8117A 1A Low-Dropout Linear Regulator
Literature Number: SNOS487E
April 2005
LMS8117A
1A Low-Dropout Linear Regulator
General Description
Features
n Available in 1.8V, 3.3V, and Adjustable Versions
The LMS8117A is a series of low dropout voltage regulators
with a dropout of 1.2V at 1A of load current. It has the same
pin-out as National Semiconductor’s industry standard
LM317.
n Space Saving SOT-223 and TO-252 Packages
n Current Limiting and Thermal Protection
n Output Current
1A
The LMS8117A is available in an adjustable version, which
can set the output voltage from 1.25V to 13.8V with only two
external resistors. In addition, it is also available in two fixed
voltages, 1.8V and 3.3V.
n Temperature Range
n Line Regulation
n Load Regulation
0˚C to 125˚C
0.2% (Max)
0.4% (Max)
The LMS8117A offers current limiting and thermal shutdown.
Its circuit includes a zener trimmed bandgap reference to
assure output voltage accuracy to within 1%.
Applications
n Post Regulator for Switching DC/DC Converter
n High Efficiency Linear Regulators
n Battery Charger
The LMS8117A series is available in SOT-223 and TO-252
D-PAK packages. A minimum of 10µF tantalum capacitor is
required at the output to improve the transient response and
stability.
n Battery Powered Instrumentation
Typical Application
Fixed Output Regulator
10119628
© 2005 National Semiconductor Corporation
DS101196
www.national.com
Ordering Information
Temperature Range (TJ)
NSC
Drawing
Package
Packaging Marking
Transport Media
0˚C to +125˚C
LMS8117AMP-ADJ
LMS8117AMPX-ADJ
LMS8117AMP-1.8
LMS8117AMPX-1.8
LMS8117AMP-3.3
LMS8117AMPX-3.3
LMS8117ADT-ADJ
LMS8117ADTX-ADJ
LMS8117ADT-1.8
LMS8117ADTX-1.8
LMS8117ADT-3.3
LMS8117ADTX-3.3
3-lead SOT-223
LS0A
LS0A
1k Tape and Reel
2k Tape and Reel
1k Tape and Reel
2k Tape and Reel
1k Tape and Reel
2k Tape and Reel
Rails
MP04A
LS00
LS00
LS01
LS01
3-lead TO-252
LMS8117ADT-ADJ
LMS8117ADT-ADJ
LMS8117ADT-1.8
LMS8117ADT-1.8
LMS8117ADT-3.3
LMS8117ADT-3.3
TD03B
2.5k Tape and Reel
Rails
2.5k Tape and Reel
Rails
2.5k Tape and Reel
Connection Diagrams
SOT-223
TO-252
10119699
Top View
10119638
Top View
Block Diagram
10119601
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Soldering Information
Infrared (20 sec)
235˚C
2000V
ESD Tolerance (Note 3)
Maximum Input Voltage (VIN to GND)
LMS8117A-ADJ, LMS8117A-1.8,
Operating Ratings (Note 1)
Input Voltage (VIN to GND)
LMS8117A-ADJ, LMS8117A-1.8,
LMS8117A-3.3
LMS8117A-3.3
20V
Power Dissipation (Note 2)
Junction Temperature (TJ)
(Note 2)
Internally Limited
15V
150˚C
Junction Temperature Range
(TJ)(Note 2)
0˚C to 125˚C
Storage Temperature Range
-65˚C to 150˚C
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.
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Symbol
VREF
Parameter
Conditions
Units
Reference Voltage
LMS8117A-ADJ
IOUT = 10mA, VIN-VOUT = 2V, TJ = 25˚C
10mA ≤ IOUT ≤ 1A, 1.4V ≤ VIN-VOUT ≤ 10V
LMS8117A-1.8
1.238
1.250
1.250
1.262
V
V
1.225
1.270
VOUT
Output Voltage
IOUT = 10mA, VIN = 3.8V, TJ = 25˚C
0 ≤ IOUT ≤ 1A, 3.2V ≤ VIN ≤ 10V
LMS8117A-3.3
1.782
1.800
1.800
1.818
V
V
1.746
1.854
IOUT = 10mA, VIN = 5V TJ = 25˚C
0 ≤ IOUT ≤ 1A, 4.75V ≤ VIN ≤ 10V
3.267
3.300
3.300
3.333
V
V
3.235
3.365
∆VOUT
Line Regulation (Note LMS8117A-ADJ
6) IOUT = 10mA, 1.5V ≤ VIN-VOUT ≤ 13.75V
0.035
1
0.2
6
%
LMS8117A-1.8
mV
IOUT = 0mA, 3.2V ≤ VIN ≤ 10V
LMS8117A-3.3
IOUT = 0mA, 4.75V ≤ VIN ≤ 15V
1
0.2
1
6
mV
%
∆VOUT
Load Regulation (Note LMS8117A-ADJ
6) VIN-VOUT = 3V, 10mA ≤ IOUT ≤ 1A
0.4
10
LMS8117A-1.8
VIN = 3.2V, 0 ≤ IOUT ≤ 1A
LMS8117A-3.3
mV
VIN = 4.75V, 0 ≤ IOUT ≤ 1A
IOUT = 100mA
1
10
1.15
1.2
mV
V
V
IN-V OUT Dropout Voltage
1.1
1.15
1.2
1.4
(Note 7)
IOUT = 500mA
V
IOUT = 1A
1.25
1.9
V
ILIMIT
Current Limit
VIN-VOUT = 5V, TJ = 25˚C
LMS8117A-ADJ
VIN = 15V
1.0
A
Minimum Load
Current (Note 8)
Quiescent Current
1.7
5
5
mA
mA
LMS8117A-1.8
10
VIN ≤ 15V
LMS8117A-3.3
VIN ≤ 15V
5
10
mA
%/W
dB
Thermal Regulation
Ripple Regulation
TA = 25˚C, 30ms Pulse
fRIPPLE = 120Hz, VIN-VOUT = 3V
VRIPPLE = 1VPP
0.01
75
0.1
60
Adjust Pin Current
Adjust Pin Current
Change
60
120
5
µA
µA
10mA ≤ IOUT ≤ 1A,
1.4V ≤ VIN-VOUT ≤ 10V
0.2
3
www.national.com
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.
Min
(Note 5)
Typ
(Note 4)
0.5
Max
(Note 5)
Symbol
Parameter
Conditions
Units
Temperature Stability
Long Term Stability
RMS Output Noise
Thermal Resistance
Junction-to-Case
Thermal Resistance
Junction-to-Ambient
(No heat sink;
%
TA = 125˚C, 1000Hrs
0.3
%
(% of VOUT), 10Hz ≤ f ≤ 10kHz
3-Lead SOT-223
0.003
15.0
10
%
˚C/W
˚C/W
˚C/W
˚C/W
3-Lead TO-252
3-Lead SOT-223
136
3-Lead TO-252 (Note 9)
92
No air flow)
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 is
JA A
J(MAX)
P
= (T –T )/θ . All numbers apply for packages soldered directly into a PC board.
J(MAX) A JA
D
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 room temperature.
Note 7: The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. It is measured when the
output voltage has dropped 100mV from the nominal value obtained at V = V
+1.5V.
IN
OUT
Note 8: The minimum output current required to maintain regulation.
2
Note 9: Minimum pad size of 0.038in
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4
Typical Performance Characteristics
Dropout Voltage (VIN-V
)
Short-Circuit Current
OUT
10119623
10119622
Load Regulation
LMS8117A-ADJ Ripple Rejection vs. Current
10119606
10119624
LMS8117A-ADJ Ripple Rejection
Temperature Stability
10119607
10119625
5
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Typical Performance Characteristics (Continued)
Adjust Pin Current
LMS8117A-1.8 Load Transient Response
10119626
10119608
LMS8117A-3.3 Load Transient Response
LMS8117A-1.8 Line Transient Response
10119610
10119609
LMS8117A-3.3 Line Transient Response
10119611
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6
Application Note
1.0 EXTERNAL CAPACITORS/STABILITY
1.1 Input Bypass Capacitor
An input capacitor is recommended. A 10µF tantalum on the
input is a suitable input bypassing for almost all applications.
1.2 Adjust Terminal Bypass Capacitor
The adjust terminal can be bypassed to ground with a by-
pass capacitor (CADJ) to improve ripple rejection. This by-
pass capacitor prevents ripple from being amplified as the
output voltage is increased. At any ripple frequency, the
impedance of the CADJ should be less than R1 to prevent the
ripple from being amplified:
<
R1
1/(2π*fRIPPLE*CADJ
)
The R1 is the resistor between the output and the adjust pin.
Its value is normally in the range of 100-200Ω. For example,
>
with R1 = 124Ω and fRIPPLE = 120Hz, the CADJ should be
11µF.
10119617
FIGURE 1. Basic Adjustable Regulator
3.0 LOAD REGULATION
1.3 Output Capacitor
The output capacitor is critical in maintaining regulator sta-
bility, and must meet the required conditions for both mini-
mum amount of capacitance and ESR (Equivalent Series
Resistance). The minimum output capacitance required by
the LMS8117A is 10µF, if a tantalum capacitor is used. Any
increase of the output capacitance will merely improve the
loop stability and transient response. The ESR of the output
capacitor should be greater than 0.5Ω and less than 5Ω. In
the case of the adjustable regulator, when the CADJ is used,
a larger output capacitance (22µf tantalum) is required.
The LMS8117A regulates the voltage that appears between
its output and ground pins, or between its output and adjust
pins. In some cases, line resistances can introduce errors to
the voltage across the load. To obtain the best load regula-
tion, a few precautions are needed.
Figure 2, shows a typical application using a fixed output
regulator. The Rt1 and Rt2 are the line resistances. It is
obvious that the VLOAD is less than the VOUT by the sum of
the voltage drops along the line resistances. In this case, the
load regulation seen at the RLOAD would be degraded from
the data sheet specification. To improve this, the load should
be tied directly to the output terminal on the positive side and
directly tied to the ground terminal on the negative side.
2.0 OUTPUT VOLTAGE
The LMS8117A adjustable version develops a 1.25V refer-
ence voltage, VREF, between the output and the adjust ter-
minal. As shown in Figure 1 , this voltage is applied across
resistor R1 to generate a constant current I1. The current
IADJ from the adjust terminal could introduce error to the
output. But since it is very small (60µA) compared with the I1
and very constant with line and load changes, the error can
be ignored. The constant current I1 then flows through the
output set resistor R2 and sets the output voltage to the
desired level.
For fixed voltage devices, R1 and R2 are integrated inside
the devices.
For fixed voltage devices, R1 and R2 are integrated inside
the devices.
10119618
FIGURE 2. Typical Application using Fixed Output
Regulator
7
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Application Note (Continued)
When the adjustable regulator is used (Figure 3), the best
performance is obtained with the positive side of the resistor
R1 tied directly to the output terminal of the regulator rather
than near the load. This eliminates line drops from appearing
effectively in series with the reference and degrading regu-
lation. For example, a 5V regulator with 0.05Ω resistance
between the regulator and load will have a load regulation
due to line resistance of 0.05Ω x IL. If R1 (=125Ω) is con-
nected near the load, the effective line resistance will be
0.05Ω (1+R2/R1) or in this case, it is 4 times worse. In
addition, the ground side of the resistor R2 can be returned
near the ground of the load to provide remote ground sens-
ing and improve load regulation.
10119615
FIGURE 4. Regulator with Protection Diode
5.0 HEATSINK REQUIREMENTS
When an integrated circuit operates with an appreciable
current, its junction temperature is elevated. It is important to
quantify its thermal limits in order to achieve acceptable
performance and reliability. This limit is determined by sum-
ming the individual parts consisting of a series of tempera-
ture rises from the semiconductor junction to the operating
environment. A one-dimensional steady-state model of con-
duction heat transfer is demonstrated in Figure 5. The heat
generated at the device junction flows through the die to the
die attach pad, through the lead frame to the surrounding
case material, to the printed circuit board, and eventually to
the ambient environment. Below is a list of variables that
may affect the thermal resistance and in turn the need for a
heatsink.
10119619
FIGURE 3. Best Load Regulation using Adjustable
Output Regulator
4.0 PROTECTION DIODES
RθJC(Component
Variables)
RθCA (Application
Variables)
Under normal operation, the LMS8117A regulators do not
need any protection diode. With the adjustable device, the
internal resistance between the adjust and output terminals
limits the current. No diode is needed to divert the current
around the regulator even with capacitor on the adjust ter-
minal. The adjust pin can take a transient signal of 25V with
respect to the output voltage without damaging the device.
Leadframe Size & Material Mounting Pad Size,
Material, & Location
No. of Conduction Pins
Placement of Mounting
Pad
Die Size
PCB Size & Material
Traces Length & Width
Adjacent Heat Sources
When a output capacitor is connected to a regulator and the
input is shorted to ground, the output capacitor will discharge
into the output of the regulator. The discharge current de-
pends on the value of the capacitor, the output voltage of the
regulator, and rate of decrease of VIN. In the LMS8117A
regulators, the internal diode between the output and input
pins can withstand microsecond surge currents of 10A to
20A. With an extremely large output capacitor (≥1000 µF),
and with input instantaneously shorted to ground, the regu-
lator could be damaged.
Die Attach Material
Molding Compound Size
and Material
Volume of Air
Ambient Temperatue
Shape of Mounting Pad
In this case, an external diode is recommended between the
output and input pins to protect the regulator, as shown in
Figure 4.
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8
Application Note (Continued)
10119637
FIGURE 5. Cross-sectional view of Integrated Circuit Mounted on a printed circuit board. Note that the case
temperature is measured at the point where the leads contact with the mounting pad surface
The LMS8117A regulators have internal thermal shutdown to
protect the device from over-heating. Under all possible
operating conditions, the junction temperature of the
LMS8117A must be within the range of 0˚C to 125˚C. A
heatsink may be required depending on the maximum power
dissipation and maximum ambient temperature of the appli-
cation. To determine if a heatsink is needed, the power
dissipated by the regulator, PD , must be calculated:
TR(max)=TJ(max)-TA(max)
where TJ(max) is the maximum allowable junction tempera-
ture (125˚C), and TA(max) is the maximum ambient tem-
perature which will be encountered in the application.
Using the calculated values for TR(max) and PD, the maxi-
mum allowable value for the junction-to-ambient thermal
resistance (θJA) can be calculated:
θJA = TR(max)/PD
IIN = IL + IG
If the maximum allowable value for θJA is found to be
≥136˚C/W for SOT-223 package or ≥92˚C/W for TO-252
package, no heatsink is needed since the package alone will
dissipate enough heat to satisfy these requirements. If the
calculated value for θJA falls below these limits, a heatsink is
required.
PD = (VIN-VOUT)I + VIN G
I
L
Figure 6 shows the voltages and currents which are present
in the circuit.
As a design aid, Table 1 shows the value of the θJA of
SOT-223 and TO-252 for different heatsink area. The copper
patterns that we used to measure these θJAs are shown at
the end of the Application Notes Section. Figure 7 and Figure
8 reflects the same test results as what are in the Table 1.
Figure 9 and Figure 10 shows the maximum allowable power
dissipation vs. ambient temperature for the SOT-223 and
TO-252 device. Figure 11 and Figure 12 shows the maxi-
mum allowable power dissipation vs. copper area (in2) for
the SOT-223 and TO-252 devices. Please see AN–1028 for
power enhancement techniques to be used with SOT-223
and TO-252 packages.
10119616
FIGURE 6. Power Dissipation Diagram
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, TR(max):
9
www.national.com
Application Note (Continued)
TABLE 1. θJA Different Heatsink Area
Layout
Copper Area
Thermal Resistance
Top Side (in2)*
Bottom Side (in2)
(θJA,˚C/W) SOT-223
(θJA,˚C/W) TO-252
1
2
0.0123
0.066
0.3
0
0
136
123
84
103
87
60
54
52
47
84
70
63
57
57
89
72
61
55
53
3
0
4
0.53
0.76
1
0
75
5
0
69
6
0
66
7
0
0.2
0.4
0.6
0.8
1
115
98
8
0
9
0
89
10
11
12
13
14
15
16
0
82
0
79
0.066
0.175
0.284
0.392
0.5
0.066
0.175
0.284
0.392
0.5
125
93
83
75
70
*Tab of device attached to topside copper
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10
Application Note (Continued)
10119636
FIGURE 10. Maximum Allowable Power Dissipation vs.
Ambient Temperature for TO-252
10119613
FIGURE 7. θJA vs. 1oz Copper Area for SOT-223
10119614
10119634
FIGURE 11. Maximum Allowable Power Dissipation vs.
1oz Copper Area for SOT-223
FIGURE 8. θJA vs. 2oz Copper Area for TO-252
10119635
10119612
FIGURE 12. Maximum Allowable Power Dissipation vs.
2oz Copper Area for TO-252
FIGURE 9. Maximum Allowable Power Dissipation vs.
Ambient Temperature for SOT-223
11
www.national.com
Application Note (Continued)
10119620
FIGURE 13. Top View of the Thermal Test Pattern in Actual Scale
www.national.com
12
Application Note (Continued)
10119621
FIGURE 14. Bottom View of the Thermal Test Pattern in Actual Scale
13
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Typical Application Circuits
10119629
1.25V to 10V Adjustable Regulator with Improved Ripple Rejection
10119627
5V Logic Regulator with Electronic Shutdown*
www.national.com
14
Physical Dimensions inches (millimeters) unless otherwise noted
3-Lead SOT-223
NS Package Number MP04A
15
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-252
NS Package Number TD03B
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SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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