LM1117/LM1117I
800mA Low-Dropout Linear Regulator
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 as-
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.
Features
nAvailable in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
nSpace Saving SOT-223 Package
nCurrent Limiting and Thermal Protection
nOutput Current 800mA
nLine Regulation 0.2% (Max)
nLoad Regulation 0.4% (Max)
nTemperature Range
— LM1117 0˚C to 125˚C
— LM1117I −40˚C to 125˚C
Applications
n2.85V Model for SCSI-2 Active Termination
nPost Regulator for Switching DC/DC Converter
nHigh Efficiency Linear Regulators
nBattery Charger
nBattery Powered Instrumentation
Typical Application
Active Terminator for SCSI-2 Bus
DS100919-5
Fixed Output Regulator
DS100919-28
December 2001
LM1117/LM1117I 800mA Low-Dropout Linear Regulator
© 2001 National Semiconductor Corporation DS100919 www.national.com
Ordering Information
Package Temperature
Range Part Number Packaging Marking Transport Media NSC
Drawing
3-lead
SOT-223 0˚C to +125˚C LM1117MPX-ADJ N03A Tape and Reel MA04A
LM1117MPX-1.8 N12A Tape and Reel
LM1117MPX-2.5 N13A Tape and Reel
LM1117MPX-2.85 N04A Tape and Reel
LM1117MPX-3.3 N05A Tape and Reel
LM1117MPX-5.0 N06A Tape and Reel
−40˚C to +125˚C LM1117IMPX-ADJ N03B Tape and Reel
LM1117IMPX-3.3 N05B Tape and Reel
LM1117IMPX-5.0 N06B Tape and Reel
3-lead TO-220 0˚C to +125˚C LM1117T-ADJ LM1117T-ADJ Rails T03B
LM1117T-2.85 LM1117T-2.85 Rails
LM1117T-3.3 LM1117T-3.3 Rails
LM1117T-5.0 LM1117T-5.0 Rails
3-lead TO-252 0˚C to +125˚C LM1117DTX-ADJ LM1117DT-ADJ Tape and Reel TD03B
LM1117DTX-1.8 LM1117DT-1.8 Tape and Reel
LM1117DTX-2.5 LM1117DT-2.5 Tape and Reel
LM1117DTX-2.85 LM1117DT-2.85 Tape and Reel
LM1117DTX-3.3 LM1117DT-3.3 Tape and Reel
LM1117DTX-5.0 LM1117DT-5.0 Tape and Reel
−40˚C to +125˚C LM1117IDTX-ADJ LM1117IDT-ADJ Tape and Reel
LM1117IDTX-3.3 LM1117IDT-3.3 Tape and Reel
LM1117IDTX-5.0 LM1117IDT-5.0 Tape and Reel
Block Diagram
DS100919-1
LM1117/LM1117I
www.national.com 2
Connection Diagrams
SOT-223
DS100919-4
Top View
TO-220
DS100919-2
Top View
TO-252
DS100919-38
Top View
LM1117/LM1117I
www.national.com3
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Input Voltage (V
IN
to GND)
LM1117-ADJ, LM1117-1.8,
LM1117-2.5, LM1117-3.3,
LM1117-5.0, LM1117I-ADJ,
LM1117I-3.3, LM1117I-5.0 20V
Power Dissipation (Note 2) Internally Limited
Junction Temperature (T
J
)
(Note 2) 150˚C
Storage Temperature Range -65˚C to 150˚C
Lead Temperature
TO-220 (T) Package 260˚C, 10 sec
SOT-223 (IMP) Package 260˚C, 4 sec
ESD Tolerance (Note 3) 2000V
Operating Ratings (Note 1)
Input Voltage (V
IN
to GND)
LM1117-ADJ, LM1117-1.8,
LM1117-2.5, LM1117-3.3,
LM1117-5.0, LM1117I-ADJ,
LM1117I-3.3, LM1117I-5.0 15V
LM1117-2.85 10V
Junction Temperature Range (T
J
)(Note 2)
LM1117 0˚C to 125˚C
LM1117I −40˚C to 125˚C
LM1117 Electrical Characteristics
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation, 0˚C to 125˚C.
Symbol Parameter Conditions Min
(Note 5) Typ
(Note 4) Max
(Note 5) Units
V
REF
Reference Voltage LM1117-ADJ
I
OUT
= 10mA, V
IN
-V
OUT
= 2V, T
J
= 25˚C
10mA ≤I
OUT
≤800mA, 1.4V ≤V
IN
-V
OUT
≤10V
1.238
1.225 1.250
1.250 1.262
1.270 V
V
V
OUT
Output Voltage LM1117-1.8
I
OUT
= 10mA, V
IN
= 3.8V, T
J
= 25˚C
0≤I
OUT
≤800mA, 3.2V ≤V
IN
≤10V 1.782
1.746 1.800
1.800 1.818
1.854 V
V
LM1117-2.5
I
OUT
= 10mA, V
IN
= 4.5V, T
J
= 25˚C
0≤I
OUT
≤800mA, 3.9V ≤V
IN
≤10V 2.475
2.450 2.500
2.500 2.525
2.550 V
V
LM1117-2.85
I
OUT
= 10mA, V
IN
= 4.85V, T
J
= 25˚C
0≤I
OUT
≤800mA, 4.25V ≤V
IN
≤10V
0≤I
OUT
≤500mA, V
IN
= 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
I
OUT
= 10mA, V
IN
=5VT
J
= 25˚C
0≤I
OUT
≤800mA, 4.75V≤V
IN
≤10V 3.267
3.235 3.300
3.300 3.333
3.365 V
V
LM1117-5.0
I
OUT
= 10mA, V
IN
= 7V, T
J
= 25˚C
0≤I
OUT
≤800mA, 6.5V ≤V
IN
≤12V 4.950
4.900 5.000
5.000 5.050
5.100 V
V
∆V
OUT
Line Regulation
(Note 6) LM1117-ADJ
I
OUT
= 10mA, 1.5V ≤V
IN
-V
OUT
≤
13.75V 0.035 0.2 %
LM1117-1.8
I
OUT
= 0mA, 3.2V ≤V
IN
≤10V 16mV
LM1117-2.5
I
OUT
= 0mA, 3.9V ≤V
IN
≤10V 16mV
LM1117-2.85
I
OUT
= 0mA, 4.25V ≤V
IN
≤10V 1 6mV
LM1117-3.3
I
OUT
= 0mA, 4.75V ≤V
IN
≤15V 1 6mV
LM1117-5.0
I
OUT
= 0mA, 6.5V ≤V
IN
≤15V 1 10 mV
LM1117/LM1117I
www.national.com 4
LM1117 Electrical Characteristics (Continued)
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation, 0˚C to 125˚C.
Symbol Parameter Conditions Min
(Note 5) Typ
(Note 4) Max
(Note 5) Units
∆V
OUT
Load Regulation
(Note 6) LM1117-ADJ
V
IN
-V
OUT
= 3V, 10 ≤I
OUT
≤800mA 0.2 0.4 %
LM1117-1.8
V
IN
= 3.2V, 0 ≤I
OUT
≤800mA 110 mV
LM1117-2.5
V
IN
= 3.9V, 0 ≤I
OUT
≤800mA 110 mV
LM1117-2.85
V
IN
= 4.25V, 0 ≤I
OUT
≤800mA 1 10 mV
LM1117-3.3
V
IN
= 4.75V, 0 ≤I
OUT
≤800mA 1 10 mV
LM1117-5.0
V
IN
= 6.5V, 0 ≤I
OUT
≤800mA 1 15 mV
V
IN
-V
OUT
Dropout Voltage
(Note 7) I
OUT
= 100mA 1.10 1.20 V
I
OUT
= 500mA 1.15 1.25 V
I
OUT
= 800mA 1.20 1.30 V
I
LIMIT
Current Limit V
IN
-V
OUT
= 5V, T
J
= 25˚C 800 1200 1500 mA
Minimum Load
Current (Note 8) LM1117-ADJ
V
IN
= 15V 1.7 5mA
Quiescent Current LM1117-1.8
V
IN
≤15V 510 mA
LM1117-2.5
V
IN
≤15V 510 mA
LM1117-2.85
V
IN
≤10V 5 10 mA
LM1117-3.3
V
IN
≤15V 5 10 mA
LM1117-5.0
V
IN
≤15V 5 10 mA
Thermal Regulation T
A
= 25˚C, 30ms Pulse 0.01 0.1 %/W
Ripple Regulation f
RIPPLE
=1 20Hz, V
IN
-V
OUT
=3V
V
RIPPLE
=1V
PP
60 75 dB
Adjust Pin Current 60 120 µA
Adjust Pin Current
Change 10 ≤I
OUT
≤800mA,
1.4V ≤V
IN
-V
OUT
≤10V 0.2 5µA
Temperature Stability 0.5 %
Long Term Stability T
A
= 125˚C, 1000Hrs 0.3 %
RMS Output Noise (% of V
OUT
), 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;
No air flow)
3-Lead SOT-223
3-Lead TO-220
3-Lead TO-252 (Note 9)
136
79
92
˚C/W
˚C/W
˚C/W
LM1117/LM1117I
www.national.com5
LM1117I Electrical Characteristics
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation, −40˚C to 125˚C.
Symbol Parameter Conditions Min
(Note 5) Typ
(Note 4) Max
(Note 5) Units
V
REF
Reference Voltage LM1117I-ADJ
I
OUT
= 10mA, V
IN
-V
OUT
= 2V, T
J
= 25˚C
10mA ≤I
OUT
≤800mA, 1.4V ≤V
IN
-V
OUT
≤10V
1.238
1.200 1.250
1.250 1.262
1.290 V
V
V
OUT
Output Voltage LM1117I-3.3
I
OUT
= 10mA, V
IN
= 5V, T
J
= 25˚C
0≤I
OUT
≤800mA, 4.75V ≤V
IN
≤10V 3.267
3.168 3.300
3.300 3.333
3.432 V
V
LM1117I-5.0
I
OUT
= 10mA, V
IN
= 7V, T
J
= 25˚C
0≤I
OUT
≤800mA, 6.5V ≤V
IN
≤12V 4.950
4.800 5.000
5.000 5.050
5.200 V
V
∆V
OUT
Line Regulation
(Note 6) LM1117I-ADJ
I
OUT
= 10mA, 1.5V ≤V
IN
-V
OUT
≤
13.75V 0.035 0.3 %
LM1117I-3.3
I
OUT
= 0mA, 4.75V ≤V
IN
≤15V 1 10 mV
LM1117I-5.0
I
OUT
= 0mA, 6.5V ≤V
IN
≤15V 1 15 mV
∆V
OUT
Load Regulation
(Note 6) LM1117I-ADJ
V
IN
-V
OUT
= 3V, 10 ≤I
OUT
≤800mA 0.2 0.5 %
LM1117I-3.3
V
IN
= 4.75V, 0 ≤I
OUT
≤800mA 1 15 mV
LM1117I-5.0
V
IN
= 6.5V, 0 ≤I
OUT
≤800mA 1 20 mV
V
IN
-V
OUT
Dropout Voltage
(Note 7) I
OUT
= 100mA 1.10 1.30 V
I
OUT
= 500mA 1.15 1.35 V
I
OUT
= 800mA 1.20 1.40 V
I
LIMIT
Current Limit V
IN
-V
OUT
= 5V, T
J
= 25˚C 800 1200 1500 mA
Minimum Load
Current (Note 8) LM1117I-ADJ
V
IN
= 15V 1.7 5mA
Quiescent Current LM1117I-3.3
V
IN
≤15V 5 15 mA
LM1117I-5.0
V
IN
≤15V 5 15 mA
Thermal Regulation T
A
= 25˚C, 30ms Pulse 0.01 0.1 %/W
Ripple Regulation f
RIPPLE
=1 20Hz, V
IN
-V
OUT
=3V
V
RIPPLE
=1V
PP
60 75 dB
Adjust Pin Current 60 120 µA
Adjust Pin Current
Change 10 ≤I
OUT
≤800mA,
1.4V ≤V
IN
-V
OUT
≤10V 0.2 10 µA
Temperature Stability 0.5 %
Long Term Stability T
A
= 125˚C, 1000Hrs 0.3 %
RMS Output Noise (% of V
OUT
), 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;
No air flow)
3-Lead SOT-223
3-Lead TO-252 (Note 9) 136
92 ˚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=(T
J(max)–TA)/θJA. All numbers apply for packages soldered directly into a PC board.
LM1117/LM1117I
www.national.com 6
LM1117I Electrical Characteristics (Continued)
Note 3: For testing purposes, ESD was applied using human body model, 1.5kΩin 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 VIN =V
OUT +1.5V.
Note 8: The minimum output current required to maintain regulation.
Note 9: Minimum pad size of 0.038in2
Typical Performance Characteristics
Dropout Voltage (V
IN
-V
OUT
)
DS100919-22
Short-Circuit Current
DS100919-23
Load Regulation
DS100919-43
LM1117-ADJ Ripple Rejection
DS100919-6
LM1117/LM1117I
www.national.com7
Typical Performance Characteristics (Continued)
LM1117-ADJ Ripple Rejection vs. Current
DS100919-7
Temperature Stability
DS100919-25
Adjust Pin Current
DS100919-26
LM1117-2.85 Load Transient Response
DS100919-8
LM1117-5.0 Load Transient Response
DS100919-9
LM1117-2.85 Line Transient Response
DS100919-10
LM1117/LM1117I
www.national.com 8
Typical Performance Characteristics (Continued)
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 (C
ADJ
) 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 C
ADJ
should be less than R1 to prevent the
ripple from being amplified:
1/(2π*f
RIPPLE
*C
ADJ
)<R1
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 = 124Ωand f
RIPPLE
= 120Hz, the C
ADJ
should be >
11µF.
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 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 C
ADJ
is used, a larger output
capacitance (22µf tantalum) is required.
2.0 Output Voltage
The LM1117 adjustable version develops a 1.25V reference
voltage, V
REF
, 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 I
ADJ
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.
3.0 Load Regulation
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.
Figure 2
, shows a typical application using a fixed output
regulator. The Rt1 and Rt2 are the line resistances. It is
obvious that the V
LOAD
is less than the V
OUT
by the sum of
the voltage drops along the line resistances. In this case, the
load regulation seen at the R
LOAD
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.
LM1117-5.0 Line Transient Response
DS100919-11
DS100919-17
FIGURE 1. Basic Adjustable Regulator
DS100919-18
FIGURE 2. Typical Application using Fixed Output
Regulator
LM1117/LM1117I
www.national.com9
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 0.05Ωresistance
between the regulator and load will have a load regulation
due to line resistance of 0.05ΩxI
L
. 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.
4.0 Protection Diodes
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
adjust pin can take a transient signal of ±25V with respect to
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 V
IN
. 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.
In this case, an external diode is recommended between the
output and input pins to protect the regulator, as shown in
Figure 4
.
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.
R
θJC
(Component Vari-
ables) R
θCA
(Application Vari-
ables)
Leadframe Size &
Material Mounting Pad Size,
Material, & Location
No. of Conduction Pins Placement of Mounting
Pad
Die Size PCB Size & Material
Die Attach Material Traces Length & Width
Molding Compound Size
and Material Adjacent Heat Sources
Volume of Air
Ambient Temperatue
Shape of Mounting Pad
DS100919-19
FIGURE 3. Best Load Regulation using Adjustable
Output Regulator
DS100919-15
FIGURE 4. Regulator with Protection Diode
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
LM1117/LM1117I
www.national.com 10
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. Aheatsink 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, P
D
, must be calculated:
I
IN
=I
L
+I
G
P
D
=(V
IN
-V
OUT
)I
L
+V
IN
I
G
Figure 6
shows the voltages and currents which are present
in the circuit.
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, T
R
(max):
T
R
(max) = T
J
(max)-T
A
(max)
where T
J
(max) is the maximum allowable junction tempera-
ture (125˚C), and T
A
(max) is the maximum ambient tem-
perature which will be encountered in the application.
Using the calculated values for T
R
(max) and P
D
, the maxi-
mum allowable value for the junction-to-ambient thermal
resistance (θ
JA
) can be calculated:
θ
JA
=T
R
(max)/P
D
If the maximum allowable value for θ
JA
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 θ
JA
falls below these limits, a heatsink is required.
As a design aid,
Table 1
shows the value of the θ
JA
of
SOT-223 and TO-252 for different heatsink area. The copper
patterns that we used to measure these θ
JA
s are shown at
the end of theApplication 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 (in
2
)
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.
TABLE 1. θ
JA
Different Heatsink Area
Layout Copper Area Thermal Resistance
Top Side (in
2
)* Bottom Side (in
2
)(θ
JA
,˚C/W) SOT-223 (θ
JA
,˚C/W) TO-252
1 0.0123 0 136 103
2 0.066 0 123 87
3 0.3 0 84 60
4 0.53 0 75 54
5 0.76 0 69 52
61 0 66 47
7 0 0.2 115 84
8 0 0.4 98 70
9 0 0.6 89 63
10 0 0.8 82 57
11 0 1 79 57
12 0.066 0.066 125 89
13 0.175 0.175 93 72
14 0.284 0.284 83 61
15 0.392 0.392 75 55
16 0.5 0.5 70 53
*Tab of device attached to topside copper
DS100919-16
FIGURE 6. Power Dissipation Diagram
LM1117/LM1117I
www.national.com11
APPLICATION NOTE (Continued)
DS100919-13
FIGURE 7. θ
JA
vs. 1oz Copper Area for SOT-223
DS100919-34
FIGURE 8. θ
JA
vs. 2oz Copper Area for TO-252
DS100919-12
FIGURE 9. Maximum Allowable Power Dissipation vs.
Ambient Temperature for SOT-223
DS100919-36
FIGURE 10. Maximum Allowable Power Dissipation vs.
Ambient Temperature for TO-252
DS100919-14
FIGURE 11. Maximum Allowable Power Dissipation vs.
1oz Copper Area for SOT-223
DS100919-35
FIGURE 12. Maximum Allowable Power Dissipation vs.
2oz Copper Area for TO-252
LM1117/LM1117I
www.national.com 12
APPLICATION NOTE (Continued)
DS100919-41
FIGURE 13. Top View of the Thermal Test Pattern in Actual Scale
LM1117/LM1117I
www.national.com13
APPLICATION NOTE (Continued)
DS100919-42
FIGURE 14. Bottom View of the Thermal Test Pattern in Actual Scale
LM1117/LM1117I
www.national.com 14
Typical Application Circuits
DS100919-30
Adjusting Output of Fixed Regulators
DS100919-31
Regulator with Reference
DS100919-29
1.25V to 10V Adjustable Regulator with Improved
Ripple Rejection
DS100919-27
5V Logic Regulator with Electronic Shutdown*
DS100919-32
Battery Backed-Up Regulated Supply
LM1117/LM1117I
www.national.com15
Typical Application Circuits (Continued)
DS100919-33
Low Dropout Negative Supply
LM1117/LM1117I
www.national.com 16
Physical Dimensions inches (millimeters) unless otherwise noted
3-Lead SOT-223
NS Package Number MA04A
LM1117/LM1117I
www.national.com17
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-220
NS Package Number T03B
LM1117/LM1117I
www.national.com 18
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Email: support@nsc.com
National Semiconductor
Europe Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: ap.support@nsc.com
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
3-Lead TO-252
NS Package Number TD03B
LM1117/LM1117I 800mA Low-Dropout Linear Regulator
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.
National P/N LM1117 - 800mA Low-Dropout Linear Regulator
See A/D Converters
Products
Products > Analog - Regulators > Linear Regulators - Low Dropout Voltage > Positive Voltage - Adjustable
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LM1117 Product Folder
800mA Low-Dropout Linear Regulator
See Also: LMS8117A - 1A OUTPUT CURRENT
Generic P/N 1117
General
Description Features Datasheet Package
& Models Samples
& Pricing Design
Tools
Parametric Table Parametric Table
Multiple Output Capability No
On/Off Pin No
Error Flag No
Input Voltage, min (Volt) 2.65
Input Voltage, max (Volt) 15
Output Current, max 800 mA
Dropout Voltage, typ (Volt) 1.20
Quiescent Current, typ (mA) 5
Secondary Ouput Voltage (Volt) -
Secondary Output Current (Amp) -
Output Voltage, min (Volt) 1.25
Output Voltage, max (Volt) 13.80
Watchdog No
Datasheet
Title Size in Kbytes Date View Online Download Receive via Email
LM1117 LM1117I 800mA Low-
Dropout Linear Regulator 409 Kbytes 11-Dec-01 View Online Download Receive via Email
If you have trouble printing or viewing PDF file(s), see Printing Problems.
Package Availability, Models, Samples & Pricing
Part Number Package Status Models Samples &
Electronic
Orders
Budgetary
Pricing Std
Pack
Size
Package
Marking
Type Pins MSL SPICE IBIS Qty $US each
LM1117MP-1.8 SOT-
223 4MSL Full
production N/A N/A
Samples
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1K+ $0.2200 reel
of
1000
¢2¢T
N12A
LM1117MP-2.5 SOT-
223 4MSL Full
production N/A N/A
Samples
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of
1000
¢2¢T
N13A
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National P/N LM1117 - 800mA Low-Dropout Linear Regulator
LM1117MP-2.85 SOT-
223 4MSL Full
production N/A N/A
Samples
Buy Now
1K+ $0.2200 reel
of
1000
¢2¢T
N04A
LM1117MP-3.3 SOT-
223 4MSL Full
production N/A N/A
Samples
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of
1000
¢2¢T
N05A
LM1117MP-5.0 SOT-
223 4MSL Full
production N/A N/A
Samples
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1000
¢2¢T
N06A
LM1117MP-ADJ SOT-
223 4MSL Full
production N/A N/A
Samples
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1K+ $0.2200 reel
of
1000
¢2¢T
N03A
LM1117MPX-1.8 SOT-
223 4MSL Full
production N/A N/A 1K+ $0.2200 reel
of
2000
¢2¢T
N12A
LM1117MPX-2.5 SOT-
223 4MSL Full
production N/A N/A
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of
2000
¢2¢T
N13A
LM1117MPX-2.85 SOT-
223 4MSL Full
production N/A N/A 1K+ $0.2200 reel
of
2000
¢2¢T
N04A
LM1117MPX-3.3 SOT-
223 4MSL Full
production N/A N/A
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of
2000
¢2¢T
N05A
LM1117MPX-5.0 SOT-
223 4MSL Full
production N/A N/A
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of
2000
¢2¢T
N06A
LM1117MPX-ADJ SOT-
223 4MSL Full
production N/A N/A
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of
2000
¢2¢T
N03A
LM1117IMP-3.3 SOT-
223 4MSL Full
production N/A N/A
Samples
1K+ $0.3600 reel
of
1000
¢2¢T
N05B
LM1117IMP-5.0 SOT-
223 4MSL Full
production N/A N/A
Samples
1K+ $0.3600 reel
of
1000
¢2¢T
N06B
LM1117IMP-ADJ SOT-
223 4MSL Full
production N/A N/A
Samples
1K+ $0.3600 reel
of
1000
¢2¢T
N03B
LM1117IMPX-3.3 SOT-
223 4MSL Full
production N/A N/A 1K+ $0.3600 reel
of
2000
¢2¢T
N05B
LM1117IMPX-5.0 SOT-
223 4MSL Full
production N/A N/A 1K+ $0.3600 reel
of
2000
¢2¢T
N06B
LM1117IMPX-ADJ SOT-
223 4MSL Full
production N/A N/A 1K+ $0.3600 reel
of
2000
¢2¢T
N03B
LM1117T-2.85 TO
220 3MSL Full
production N/A N/A
24 Hour
Samples
Buy Now
1K+ $0.3700 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117T
2.85
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National P/N LM1117 - 800mA Low-Dropout Linear Regulator
LM1117T-3.3 TO
220 3MSL Full
production N/A N/A
24 Hour
Samples
Buy Now
1K+ $0.3700 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117T
3.3
LM1117T-5.0 TO
220 3MSL Full
production N/A N/A
24 Hour
Samples
Buy Now
1K+ $0.3700 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117T
5.0
LM1117T-ADJ TO
220 3MSL Full
production N/A N/A
24 Hour
Samples
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1K+ $0.3700 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117T
ADJ
LM1117DT-1.8 TO
252 3MSL Full
production N/A N/A
Samples
1K+ $0.3700 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
DT-1.8
LM1117DT-2.5 TO
252 3MSL Full
production N/A N/A
24 Hour
Samples
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1K+ $0.3700 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
DT-2.5
LM1117DT-2.85 TO
252 3MSL Full
production N/A N/A
24 Hour
Samples
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1K+ $0.3700 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
DT-2.85
LM1117DT-3.3 TO
252 3MSL Full
production N/A N/A
24 Hour
Samples
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1K+ $0.3700 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
DT-3.3
LM1117DT-5.0 TO
252 3MSL Full
production N/A N/A
24 Hour
Samples
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1K+ $0.3700 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
DT-5.0
LM1117DT-ADJ TO
252 3MSL Full
production N/A N/A
24 Hour
Samples
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1K+ $0.3700 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
DT-ADJ
LM1117IDT-3.3 TO
252 3MSL Full
production N/A N/A
Samples
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1K+ $0.3820 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
IDT-3.3
LM1117IDT-5.0 TO
252 3MSL Full
production N/A N/A
Samples
1K+ $0.3820 rail
of
75
[logo]¢U¢Z¢2¢T
LM1117
IDT-5.0
LM1117IDT-ADJ TO
252 3MSL Full
production N/A N/A
Samples
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75
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LM1117
IDT-ADJ
LM1117DTX-2.5 TO
252 3MSL Full
production N/A N/A
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1K+ $0.3700 reel
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2500
[logo]¢U¢Z¢2¢T
LM1117
DT-2.5
LM1117DTX-2.85 TO
252 3MSL Full
production N/A N/A 1K+ $0.3700 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
DT-2.85
LM1117DTX-3.3 TO
252 3MSL Full
production N/A N/A 1K+ $0.3700 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
DT-3.3
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National P/N LM1117 - 800mA Low-Dropout Linear Regulator
LM1117DTX-5.0 TO
252 3MSL Full
production N/A N/A
Buy Now
1K+ $0.3700 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
DT-5.0
LM1117DTX-ADJ TO
252 3MSL Full
production N/A N/A
Buy Now
1K+ $0.3700 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
DT-ADJ
LM1117IDTX-3.3 TO
252 3MSL Full
production N/A N/A 1K+ $0.3820 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
IDT-3.3
LM1117IDTX-5.0 TO
252 3MSL Full
production N/A N/A 1K+ $0.3820 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
IDT-5.0
LM1117IDTX-ADJ TO
252 3MSL Full
production N/A N/A
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1K+ $0.3820 reel
of
2500
[logo]¢U¢Z¢2¢T
LM1117
IDT-ADJ
LM1117S-2.85 TO
263 3MSL Full
production N/A N/A
Samples
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1K+ $0.4100 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117S
2.85
LM1117S-3.3 TO
263 3MSL Full
production N/A N/A
Samples
1K+ $0.4100 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117S
3.3
LM1117S-5.0 TO
263 3MSL Full
production N/A N/A
Samples
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1K+ $0.4100 rail
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45
[logo]¢U¢Z¢2¢T
LM1117S
5.0
LM1117S-ADJ TO
263 3MSL Full
production N/A N/A
Samples
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1K+ $0.4100 rail
of
45
[logo]¢U¢Z¢2¢T
LM1117S
ADJ
LM1117SX-2.85 TO
263 3MSL Full
production N/A N/A 1K+ $0.4100 reel
of
500
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LM1117S
2.85
LM1117SX-5.0 TO
263 3MSL Full
production N/A N/A 1K+ $0.4100 reel
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500
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LM1117S
5.0
LM1117SX-ADJ TO
263 3MSL Full
production N/A N/A 1K+ $0.4100 reel
of
500
[logo]¢U¢Z¢2¢T
LM1117S
ADJ
LM1117-1.8 MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM1117-2.5 MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM1117-2.85
MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM1117-3.3 MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM1117-5.0 MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
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National P/N LM1117 - 800mA Low-Dropout Linear Regulator
LM1117-ADJ MDC Die Full
production N/A N/A
Samples
tray
of
N/A -
LM1117-1.8 MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
LM1117-2.5 MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
LM1117-2.85
MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
LM1117-3.3 MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
LM1117-5.0 MWC Wafer Full
production N/A N/A
wafer
jar
of
N/A
-
LM1117-ADJ
MWC Wafer Full
production N/A N/A
wafer
jar
of
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
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National P/N LM1117 - 800mA Low-Dropout Linear Regulator
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
Line Regulation 0.2% (Max)
Load Regulation 0.4% (Max)
● 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 View Online Download Receive via Email
LM1117 Qualification Package 1211 Kbytes 14-Sep-1999 View Online Download Receive via Email
If you have trouble printing or viewing PDF file(s), see Printing Problems.
[Information as of 5-Aug-2002]
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