LM1117MP-2.85 [ROCHESTER]
2.85V FIXED POSITIVE LDO REGULATOR, 1.3V DROPOUT, PDSO4, SOT-223, 4 PIN;型号: | LM1117MP-2.85 |
厂家: | Rochester Electronics |
描述: | 2.85V FIXED POSITIVE LDO REGULATOR, 1.3V DROPOUT, PDSO4, SOT-223, 4 PIN 光电二极管 |
文件: | 总26页 (文件大小:1230K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
December 2001
LM1117/LM1117I
800mA Low-Dropout Linear Regulator
General Description
Features
n Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
The LM1117 is a series of low dropout voltage regulators
with a dropout of 1.2V at 800mA of load current. It has the
same pin-out as National Semiconductor’s industry standard
LM317.
n Space Saving SOT-223 Package
n Current Limiting and Thermal Protection
The LM1117 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 five fixed
voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V.
n Output Current
n Line Regulation
n Load Regulation
n Temperature Range
— LM1117
800mA
0.2% (Max)
0.4% (Max)
The LM1117 offers current limiting and thermal shutdown. Its
circuit includes a zener trimmed bandgap reference to as-
0˚C to 125˚C
−40˚C to 125˚C
— LM1117I
±
sure output voltage accuracy to within 1%.
The LM1117 series is available in SOT-223, TO-220, and
TO-252 D-PAK packages. A minimum of 10µF tantalum ca-
pacitor is required at the output to improve the transient
response and stability.
Applications
n 2.85V Model for SCSI-2 Active Termination
n Post Regulator for Switching DC/DC Converter
n High Efficiency Linear Regulators
n Battery Charger
n Battery Powered Instrumentation
Typical Application
Active Terminator for SCSI-2 Bus
DS100919-5
Fixed Output Regulator
DS100919-28
© 2001 National Semiconductor Corporation
DS100919
www.national.com
Ordering Information
Package
Temperature
Range
Part Number
Packaging Marking
Transport Media
NSC
Drawing
MA04A
3-lead
SOT-223
0˚C to +125˚C
LM1117MPX-ADJ
LM1117MPX-1.8
LM1117MPX-2.5
LM1117MPX-2.85
LM1117MPX-3.3
LM1117MPX-5.0
LM1117IMPX-ADJ
LM1117IMPX-3.3
LM1117IMPX-5.0
LM1117T-ADJ
N03A
N12A
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Rails
N13A
N04A
N05A
N06A
−40˚C to +125˚C
0˚C to +125˚C
N03B
N05B
N06B
3-lead TO-220
3-lead TO-252
LM1117T-ADJ
LM1117T-2.85
LM1117T-3.3
LM1117T-5.0
LM1117DT-ADJ
LM1117DT-1.8
LM1117DT-2.5
LM1117DT-2.85
LM1117DT-3.3
LM1117DT-5.0
LM1117IDT-ADJ
LM1117IDT-3.3
LM1117IDT-5.0
T03B
LM1117T-2.85
Rails
LM1117T-3.3
Rails
LM1117T-5.0
Rails
0˚C to +125˚C
LM1117DTX-ADJ
LM1117DTX-1.8
LM1117DTX-2.5
LM1117DTX-2.85
LM1117DTX-3.3
LM1117DTX-5.0
LM1117IDTX-ADJ
LM1117IDTX-3.3
LM1117IDTX-5.0
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
TD03B
−40˚C to +125˚C
Block Diagram
DS100919-1
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2
Connection Diagrams
SOT-223
DS100919-4
Top View
TO-220
DS100919-2
Top View
TO-252
DS100919-38
Top View
3
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
SOT-223 (IMP) Package
ESD Tolerance (Note 3)
260˚C, 4 sec
2000V
Operating Ratings (Note 1)
Maximum Input Voltage (VIN to GND)
Input Voltage (VIN to GND)
LM1117-ADJ, LM1117-1.8,
LM1117-2.5, LM1117-3.3,
LM1117-5.0, LM1117I-ADJ,
LM1117-ADJ, LM1117-1.8,
LM1117-2.5, LM1117-3.3,
LM1117-5.0, LM1117I-ADJ,
LM1117I-3.3, LM1117I-5.0
LM1117I-3.3, LM1117I-5.0
20V
15V
10V
Power Dissipation (Note 2)
Internally Limited
LM1117-2.85
Junction Temperature (TJ)
(Note 2)
Junction Temperature Range (TJ)(Note 2)
150˚C
LM1117
LM1117I
0˚C to 125˚C
Storage Temperature Range
Lead Temperature
-65˚C to 150˚C
−40˚C to 125˚C
TO-220 (T) Package
260˚C, 10 sec
LM1117 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
Parameter
Conditions
Units
VREF
Reference Voltage
LM1117-ADJ
IOUT = 10mA, VIN-VOUT = 2V, TJ = 25˚C
10mA ≤ IOUT ≤ 800mA, 1.4V ≤ VIN-VOUT
≤ 10V
1.238
1.225
1.250
1.250
1.262
1.270
V
V
VOUT
Output Voltage
LM1117-1.8
IOUT = 10mA, VIN = 3.8V, TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 3.2V ≤ VIN ≤ 10V
1.782
1.746
1.800
1.800
1.818
1.854
V
V
LM1117-2.5
IOUT = 10mA, VIN = 4.5V, TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 3.9V ≤ VIN ≤ 10V
2.475
2.450
2.500
2.500
2.525
2.550
V
V
LM1117-2.85
IOUT = 10mA, VIN = 4.85V, TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 4.25V ≤ VIN ≤ 10V
0 ≤ IOUT ≤ 500mA, VIN = 4.10V
2.820
2.790
2.790
2.850
2.850
2.850
2.880
2.910
2.910
V
V
V
LM1117-3.3
IOUT = 10mA, VIN = 5V TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 4.75V≤ VIN ≤ 10V
3.267
3.235
3.300
3.300
3.333
3.365
V
V
LM1117-5.0
IOUT = 10mA, VIN = 7V, TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 6.5V ≤ VIN ≤ 12V
4.950
4.900
5.000
5.000
5.050
5.100
V
V
∆VOUT
Line Regulation
(Note 6)
LM1117-ADJ
IOUT = 10mA, 1.5V ≤ VIN-VOUT
≤
0.035
0.2
6
%
13.75V
LM1117-1.8
IOUT = 0mA, 3.2V ≤ VIN ≤ 10V
1
1
mV
mV
LM1117-2.5
IOUT = 0mA, 3.9V ≤ VIN ≤ 10V
6
LM1117-2.85
IOUT = 0mA, 4.25V ≤ VIN ≤ 10V
1
1
1
6
6
mV
mV
mV
LM1117-3.3
IOUT = 0mA, 4.75V ≤ VIN ≤ 15V
LM1117-5.0
IOUT = 0mA, 6.5V ≤ VIN ≤ 15V
10
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4
LM1117 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)
Max
(Note 5)
Symbol
Parameter
Conditions
Units
∆VOUT
Load Regulation
(Note 6)
LM1117-ADJ
VIN-VOUT = 3V, 10 ≤ IOUT ≤ 800mA
0.2
1
0.4
10
%
LM1117-1.8
mV
VIN = 3.2V, 0 ≤ IOUT ≤ 800mA
LM1117-2.5
1
10
mV
VIN = 3.9V, 0 ≤ IOUT ≤ 800mA
LM1117-2.85
VIN = 4.25V, 0 ≤ IOUT ≤ 800mA
1
1
10
10
mV
mV
LM1117-3.3
VIN = 4.75V, 0 ≤ IOUT ≤ 800mA
LM1117-5.0
VIN = 6.5V, 0 ≤ IOUT ≤ 800mA
1
15
mV
V
VIN-V OUT Dropout Voltage
IOUT = 100mA
1.10
1.15
1.20
1200
1.20
1.25
1.30
1500
(Note 7)
IOUT = 500mA
V
IOUT = 800mA
V
ILIMIT
Current Limit
VIN-VOUT = 5V, TJ = 25˚C
800
mA
Minimum Load
Current (Note 8)
LM1117-ADJ
VIN = 15V
1.7
5
5
mA
mA
Quiescent Current
LM1117-1.8
10
VIN ≤ 15V
LM1117-2.5
5
10
mA
VIN ≤ 15V
LM1117-2.85
VIN ≤ 10V
5
5
10
10
mA
mA
LM1117-3.3
VIN ≤ 15V
LM1117-5.0
VIN ≤ 15V
5
10
mA
%/W
dB
Thermal Regulation
Ripple Regulation
TA = 25˚C, 30ms Pulse
0.01
75
0.1
fRIPPLE =1 20Hz, VIN-VOUT = 3V
VRIPPLE = 1VPP
60
Adjust Pin Current
60
120
5
µA
Adjust Pin Current
Change
10 ≤ IOUT≤ 800mA,
1.4V ≤ VIN-VOUT ≤ 10V
0.2
0.5
µA
%
%
%
Temperature Stability
Long Term Stability
RMS Output Noise
TA = 125˚C, 1000Hrs
0.3
(% of VOUT), 10Hz ≤ f ≤10kHz
0.003
Thermal Resistance
Junction-to-Case
3-Lead SOT-223
3-Lead TO-220
3-Lead TO-252
15.0
3.0
10
˚C/W
˚C/W
˚C/W
Thermal Resistance
Junction-to-Ambient
(No heat sink;
3-Lead SOT-223
3-Lead TO-220
3-Lead TO-252 (Note 9)
136
79
92
˚C/W
˚C/W
˚C/W
No air flow)
5
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LM1117I 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, −40˚C to 125˚C.
Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)
Symbol
Parameter
Conditions
Units
VREF
Reference Voltage
LM1117I-ADJ
IOUT = 10mA, VIN-VOUT = 2V, TJ = 25˚C
10mA ≤ IOUT ≤ 800mA, 1.4V ≤ VIN-VOUT
≤ 10V
1.238
1.200
1.250
1.250
1.262
1.290
V
V
VOUT
Output Voltage
LM1117I-3.3
IOUT = 10mA, VIN = 5V, TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 4.75V ≤ VIN ≤ 10V
3.267
3.168
3.300
3.300
3.333
3.432
V
V
LM1117I-5.0
IOUT = 10mA, VIN = 7V, TJ = 25˚C
0 ≤ IOUT ≤ 800mA, 6.5V ≤ VIN ≤ 12V
4.950
4.800
5.000
5.000
5.050
5.200
V
V
∆VOUT
Line Regulation
(Note 6)
LM1117I-ADJ
IOUT = 10mA, 1.5V ≤ VIN-VOUT
≤
0.035
0.3
%
13.75V
LM1117I-3.3
IOUT = 0mA, 4.75V ≤ VIN ≤ 15V
1
1
10
15
0.5
15
mV
mV
%
LM1117I-5.0
IOUT = 0mA, 6.5V ≤ VIN ≤ 15V
∆VOUT
Load Regulation
(Note 6)
LM1117I-ADJ
VIN-VOUT = 3V, 10 ≤ IOUT ≤ 800mA
0.2
1
LM1117I-3.3
VIN = 4.75V, 0 ≤ IOUT ≤ 800mA
mV
LM1117I-5.0
VIN = 6.5V, 0 ≤ IOUT ≤ 800mA
1
20
mV
V
VIN-V OUT Dropout Voltage
IOUT = 100mA
1.10
1.15
1.20
1200
1.30
1.35
1.40
1500
(Note 7)
IOUT = 500mA
V
IOUT = 800mA
V
ILIMIT
Current Limit
VIN-VOUT = 5V, TJ = 25˚C
800
mA
Minimum Load
Current (Note 8)
LM1117I-ADJ
VIN = 15V
1.7
5
5
mA
mA
Quiescent Current
LM1117I-3.3
VIN ≤ 15V
15
LM1117I-5.0
VIN ≤ 15V
5
15
mA
%/W
dB
Thermal Regulation
Ripple Regulation
TA = 25˚C, 30ms Pulse
0.01
75
0.1
fRIPPLE =1 20Hz, VIN-VOUT = 3V
VRIPPLE = 1VPP
60
Adjust Pin Current
60
120
10
µA
Adjust Pin Current
Change
10 ≤ IOUT≤ 800mA,
1.4V ≤ VIN-VOUT ≤ 10V
0.2
0.5
µA
%
%
%
Temperature Stability
Long Term Stability
RMS Output Noise
TA = 125˚C, 1000Hrs
0.3
(% of VOUT), 10Hz ≤ f ≤10kHz
0.003
Thermal Resistance
Junction-to-Case
3-Lead SOT-223
-Lead TO-252
15.0
10
˚C/W
˚C/W
Thermal Resistance
Junction-to-Ambient
(No heat sink;
3-Lead SOT-223
3-Lead TO-252 (Note 9)
136
92
˚C/W
˚C/W
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
D
= (T
–T )/θ . All numbers apply for packages soldered directly into a PC board.
J(max) A JA
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6
LM1117I Electrical Characteristics (Continued)
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
IN
+1.5V.
OUT
Note 8: The minimum output current required to maintain regulation.
2
Note 9: Minimum pad size of 0.038in
Typical Performance Characteristics
Dropout Voltage (VIN-V
)
Short-Circuit Current
OUT
DS100919-22
DS100919-23
Load Regulation
LM1117-ADJ Ripple Rejection
DS100919-43
DS100919-6
7
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Typical Performance Characteristics (Continued)
LM1117-ADJ Ripple Rejection vs. Current
Temperature Stability
DS100919-25
DS100919-7
Adjust Pin Current
LM1117-2.85 Load Transient Response
DS100919-26
DS100919-8
LM1117-5.0 Load Transient Response
LM1117-2.85 Line Transient Response
DS100919-9
DS100919-10
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8
Typical Performance Characteristics (Continued)
LM1117-5.0 Line Transient Response
DS100919-11
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.
DS100919-17
Its value is normally in the range of 100-200Ω. For example,
FIGURE 1. Basic Adjustable Regulator
>
with R1 = 124Ω and fRIPPLE = 120Hz, the CADJ should be
11µF.
3.0 Load Regulation
1.3 Output Capacitor
The LM1117 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.
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 LM1117 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 less than 0.5Ω. In the case of the
adjustable regulator, when the CADJ is used, a larger output
capacitance (22µf tantalum) is required.
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 LM1117 adjustable version develops a 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. 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 ig-
nored. 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.
DS100919-18
FIGURE 2. Typical Application using Fixed Output
Regulator
9
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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.
DS100919-15
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.
DS100919-19
FIGURE 3. Best Load Regulation using Adjustable
Output Regulator
4.0 Protection Diodes
θJC(Component Vari-
ables)
RθCA (Application Vari-
ables)
Under normal operation, the LM1117 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 terminal. The
R
Leadframe Size &
Material
Mounting Pad Size,
Material, & Location
±
adjust pin can take a transient signal of 25V with respect to
No. of Conduction Pins
Placement of Mounting
Pad
the output voltage without damaging the device.
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 LM1117 regu-
lators, 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 regulator
could be damaged.
Die Size
PCB Size & Material
Traces Length & Width
Adjacent Heat Sources
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.
DS100919-37
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
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10
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, TR(max):
APPLICATION NOTE (Continued)
The LM1117 regulators have internal thermal shutdown to
protect the device from over-heating. Under all possible
operating conditions, the junction temperature of the LM1117
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 application. To deter-
mine 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 ≥79˚C/W for TO-220
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. Figures Figure 11 and Figure 12 shows the
maximum allowable power dissipation vs. copper area (in2)
for the SOT-223 and TO-252 devices. Please see AN1028
for power enhancement techniques to be used with SOT-223
and TO-252 packages.
DS100919-16
FIGURE 6. Power Dissipation Diagram
TABLE 1. θJA Different Heatsink Area
Copper Area
Layout
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
11
www.national.com
APPLICATION NOTE (Continued)
DS100919-36
FIGURE 10. Maximum Allowable Power Dissipation vs.
Ambient Temperature for TO-252
DS100919-13
FIGURE 7. θJA vs. 1oz Copper Area for SOT-223
DS100919-14
DS100919-34
FIGURE 11. Maximum Allowable Power Dissipation vs.
1oz Copper Area for SOT-223
FIGURE 8. θJA vs. 2oz Copper Area for TO-252
DS100919-12
DS100919-35
FIGURE 9. Maximum Allowable Power Dissipation vs.
Ambient Temperature for SOT-223
FIGURE 12. Maximum Allowable Power Dissipation vs.
2oz Copper Area for TO-252
www.national.com
12
APPLICATION NOTE (Continued)
DS100919-41
FIGURE 13. Top View of the Thermal Test Pattern in Actual Scale
13
www.national.com
APPLICATION NOTE (Continued)
DS100919-42
FIGURE 14. Bottom View of the Thermal Test Pattern in Actual Scale
www.national.com
14
Typical Application Circuits
DS100919-31
DS100919-30
Regulator with Reference
Adjusting Output of Fixed Regulators
DS100919-27
5V Logic Regulator with Electronic Shutdown*
DS100919-29
1.25V to 10V Adjustable Regulator with Improved
Ripple Rejection
DS100919-32
Battery Backed-Up Regulated Supply
15
www.national.com
Typical Application Circuits (Continued)
DS100919-33
Low Dropout Negative Supply
www.national.com
16
Physical Dimensions inches (millimeters) unless otherwise noted
3-Lead SOT-223
NS Package Number MA04A
17
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-220
NS Package Number T03B
www.national.com
18
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-252
NS Package Number TD03B
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Products > Analog - Regulators > Linear Regulators - Low Dropout Voltage > Positive Voltage - Adjustable
> LM1117
LM1117 Product Folder
800mA Low-Dropout Linear Regulator
LMS8117A - 1A OUTPUT CURRENT
See Also:
Generic P/N 1117
General
Package
& Models
Samples
& Pricing
Design
Tools
Features
Datasheet
Description
Parametric Table
Multiple Output Capability
On/Off Pin
Parametric Table
No
Dropout Voltage, typ (Volt)
Quiescent Current, typ (mA)
1.20
5
No
Error Flag
No
Secondary Ouput Voltage (Volt)
Secondary Output Current (Amp)
Output Voltage, min (Volt)
Output Voltage, max (Volt)
Watchdog
-
Input Voltage, min (Volt)
Input Voltage, max (Volt)
Output Current, max
2.65
15
-
1.25
13.80
No
800 mA
Datasheet
Title
Size in Kbytes Date
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LM1117 LM1117I 800mA Low-
Dropout Linear Regulator
409 Kbytes
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1000
SOT-
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LM1117MP-1.8
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LM1117MP-2.85
LM1117MP-3.3
LM1117MP-5.0
LM1117MP-ADJ
4
4
4
4
N/A
N/A
N/A
N/A
N/A
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LM1117MPX-2.5
LM1117MPX-2.85
LM1117MPX-3.3
LM1117MPX-5.0
LM1117MPX-ADJ
LM1117IMP-3.3
LM1117IMP-5.0
LM1117IMP-ADJ
LM1117IMPX-3.3
LM1117IMPX-5.0
LM1117IMPX-ADJ
4
4
4
4
4
4
4
4
4
4
4
4
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N/A
N/A
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1K+ $0.3600
1K+ $0.3600
1K+ $0.3600
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223
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LM1117T-ADJ
LM1117DT-1.8
LM1117DT-2.5
3
3
3
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252
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252
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LM1117DT-2.85
LM1117DT-3.3
LM1117DT-5.0
LM1117DT-ADJ
3
3
3
3
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75
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252
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252
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LM1117IDT-3.3
LM1117IDT-5.0
LM1117IDT-ADJ
3
3
3
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LM1117DTX-2.5
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LM1117DTX-3.3
3
3
3
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N/A
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2500
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252
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2500
LM1117
DT-3.3
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252
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MSL
MSL
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LM1117DTX-5.0
LM1117DTX-ADJ
LM1117IDTX-3.3
LM1117IDTX-5.0
LM1117IDTX-ADJ
3
3
3
3
3
N/A
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N/A
N/A
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of
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LM1117
DT-5.0
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LM1117S
2.85
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263
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MSL
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LM1117S-2.85
LM1117S-3.3
LM1117S-5.0
3
3
3
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LM1117S
3.3
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MSL
MSL
LM1117SX-2.85
LM1117SX-5.0
LM1117SX-ADJ
LM1117-1.8 MDC
LM1117-2.5 MDC
3
3
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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of
500
LM1117S
2.85
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TO
263
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of
500
LM1117S
5.0
reel [logo]¢U¢Z¢2¢T
TO
263
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3
of
500
LM1117S
ADJ
tray
of
N/A
Full
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Samples
Samples
Samples
Samples
Samples
Die
Die
Die
Die
Die
-
-
-
-
-
tray
of
N/A
Full
production
tray
of
N/A
LM1117-2.85
MDC
Full
production
tray
of
N/A
Full
production
LM1117-3.3 MDC
LM1117-5.0 MDC
tray
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production
N/A
tray
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N/A
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production
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Die
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LM1117-1.8 MWC
N/A
N/A
N/A
N/A
-
-
wafer
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Full
production
Wafer
N/A
wafer
jar
of
Full
production
Wafer
Wafer
Wafer
Wafer
Wafer
LM1117-2.5 MWC
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
-
-
-
-
-
N/A
wafer
jar
of
LM1117-2.85
MWC
Full
production
N/A
wafer
jar
of
Full
production
LM1117-3.3 MWC
LM1117-5.0 MWC
N/A
wafer
jar
of
Full
production
N/A
wafer
jar
of
LM1117-ADJ
MWC
Full
production
N/A
General Description
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It
has the same pin-out as National Semiconductor's industry standard LM317.
The LM1117 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 five fixed voltages, 1.8V, 2.5V, 2.85V, 3.3V,
and 5V.
The LM1117 offers current limiting and thermal shutdown. Its circuit includes a zener trimmed bandgap
reference to assure output voltage accuracy to within ±1%.
The LM1117 series is available in SOT-223, TO-220, and TO-252 D-PAK packages. A minimum of 10µF
tantalum capacitor is required at the output to improve the transient response and stability.
Features
Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions
Space Saving SOT-223 Package
Current Limiting and Thermal Protection
Output Current
800mA
0.2% (Max)
0.4% (Max)
Line Regulation
Load Regulation
●
Temperature Range
LM1117
0°C to 125°C
LM1117I -40°C to 125°C
Applications
●
●
●
●
●
2.85V Model for SCSI-2 Active Termination
Post Regulator for Switching DC/DC Converter
High Efficiency Linear Regulators
Battery Charger
Battery Powered Instrumentation
Design Tools
Title
Size in Kbytes Date
14-Sep-1999
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LM1117 Qualification Package 1211 Kbytes
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[Information as of 5-Aug-2002]
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