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 ex-
ternal resistors. In addition, it is also available in three fixed
voltages, 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 re-
sponse and stability.
Features
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Available in 2.85V, 3.3V, 5V, and Adjustable Versions
Space Saving SOT-223 Package
Current Limiting and Thermal Protection
Output Current
800mA
Temperature Range
0˚C to 125˚C
Line Regulation
0.2% (Max)
Load Regulation
0.4% (Max)
Applications
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2.85V Model for SCSI-2 Active Termination
Post Regulator for Switching DC/DC Converter
High Efficiency Linear Regulators
Battery Charger
Battery Powered Instrumentation
Typical Application
Active Terminator for SCSI-2 Bus
Fixed Output Regulator
1
LM1117 800mA Low-dropout Linear Regulator
Ordering Information
Package
3-lead SOT-223
Temperature Range
0˚C to +125˚C
LM1117-ADJ-223
LM1117-2.85-223
LM1117-3.3-223
LM1117-5.0-223
3-lead TO-220
LM1117-ADJ-220
LM1117-2.85-220
LM1117-3.3-220
LM1117-5.0-220
3-lead TO-252
LM1117-ADJ-252
LM1117-2.85-252
LM1117-3.3-252
LM1117-5.0-252
Packing
Tape and Reel
Tape
and Reel
Tape and Reel
Tape and Reel
Rails
Rails
Rails
Rails
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
5 lead available
suffix add 252-5L
5 lead available
suffix add 220-5L
Block Diagram
2
LM1117 800mA Low-dropout Linear Regulator
Connection Diagrams
SOT-223
DS100919-4
Top View
TO-220
DS100919-2
Top View
TO-252
DS100919-38
Top View
3
LM1117 800mA Low-dropout Linear Regulator
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, LM1117-3.3,
LM1117-5.0
Power Dissipation (Note 2)
Junction Temperature (T
J
)
(Note 2)
Storage Temperature Range
Lead Temperature
20V
Internally Limited
150˚C
-65˚C to 150˚C
TO-220 Package
SOT-223 Package
ESD Tolerance (Note 3)
260˚C, 10 sec
260˚C, 4 sec
2000V
Operating Ratings
(Note 1)
Input Voltage (V
IN
to GND)
LM1117-ADJ, LM1117-3.3,
LM1117-5.0
LM1117-2.85
Junction Temperature Range (T
J
)
(Note 2)
15V
10V
0˚C to 125˚C
Electrical Characteristics
Typicals and limits appearing in normal type apply for T
tion temperature range for operation, 0˚C to 125˚C.
Symbol
V
REF
Parameter
Reference Voltage
J
= 25˚C. Limits appearing in
Boldface
type apply over the entire junc-
Min
(Note 5)
1.238
1.225
Typ
(Note 4)
1.250
1.250
Max
(Note 5)
1.262
1.270
Units
V
V
Conditions
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
LM1117-2.85
I
OUT
=10mA, V
IN
=4.85V, T
J
=25˚C
O≤I
OUT
≤800mA,
4.25V≤ V
IN
≤10V
O≤I
OUT
≤500mA,
V
IN
=4.10V
LM1117-3.3
I
OUT
=10mA, V
IN
=5V T
J
=25˚C
O≤I
OUT
≤800mA,
4.75V≤ V
IN
≤10V
LM1117-5.0
I
OUT
=10mA, V
IN
=7V, T
J
=25˚C
O≤I
OUT
≤
800mA, 6.5V≤ V
IN
≤12V
V
OUT
Output Voltage
2.820
2.790
2.790
3.267
3.235
4.950
4.900
2.850
2.850
2.850
3.300
3.300
5.000
5.000
0.035
1
1
1
0.2
1
1
1
1.10
1.15
1.20
2.880
2.910
2.910
3.333
3.365
5.050
5.100
0.2
6
6
10
0.4
10
10
15
1.20
1.25
1.30
1500
5
V
V
V
V
V
V
V
%
mV
mV
mV
%
mV
mV
mV
V
V
V
mA
mA
∆V
OUT
Line Regulation
(Note 6)
LM1117-ADJ
I
OUT
=10mA, 1.5V≤ V
IN
-V
OUT
≤13.75V
LM1117-2.85
I
OUT
=0mA, 4.25V≤ V
IN
≤10V
LM1117-3.3
I
OUT
=0mA, 4.75V≤ V
IN
≤15V
LM1117-5.0
I
OUT
=0mA, 6.5V≤ V
IN
≤15V
∆V
OUT
Load Regulation
(Note 6)
LM1117-ADJ
V
IN
-V
OUT
=3V, 10≤I
OUT
≤800mA
LM1117-2.85
V
IN
=4.25V, 0≤I
OUT
≤800mA
LM1117-3.3
V
IN
=4.75V, 0≤I
OUT
≤800mA
LM1117-5.0
V
IN
=6.5V, 0≤I
OUT
≤800mA
V
IN
-V
OUT
Dropout Voltage
(Note 7)
Current Limit
Minimum Load
Current (Note 8)
I
OUT
=100mA
I
OUT
=500mA
I
OUT
=800mA
V
IN
-V
OUT
=5V, T
J
=25˚C
LM1117-ADJ
V
IN
=15V
800
I
LIMIT
1200
1.7
4
LM1117 800mA Low-dropout Linear Regulator
Electrical Characteristics
Symbol
Parameter
Quiescent Current
(Continued)
J
Typicals and limits appearing in normal type apply for T
tion temperature range for operation, 0˚C to 125˚C.
= 25˚C. Limits appearing in
Boldface
type apply over the entire junc-
Min
(Note 5)
Typ
(Note 4)
5
5
5
0.01
60
75
60
120
5
Max
(Note 5)
10
10
10
0.1
Units
mA
mA
mA
%/W
dB
µA
µA
%
%
%
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
Conditions
LM1117-2.85
V
IN
≤10V
LM1117-3.3
V
IN
≤15V
LM1117-5.0
V
IN
≤15V
Thermal Regulation
Ripple Regulation
Adjust Pin Current
Adjust Pin Current
Change
Temperature Stability
Long Term Stability
RMS Output Noise
Thermal Resistance
Junction-to-Case
Thermal Resistance
Junction-to-Ambient
(No heat sink;
No air flow)
T
A
=25˚C, 30ms Pulse
f
RIPPLE
=120Hz, V
IN
-V
OUT
=3V
V
RIPPLE
=1V
PP
10≤ I
OUT
≤
800mA,
1.4V≤ V
IN
-V
OUT
≤
10V
T
A
=125˚C, 1000Hrs
(% of V
OUT
), 10Hz≤f≤10kHz
3-Lead SOT-223
3,5 -Lead TO-220
3,5 -Lead TO-252
3-Lead SOT-223
3,5 -Lead TO-220
3,5 -Lead TO-252(Note 9)
0.2
0.5
0.3
0.003
15.0
3.0
10
136
79
92
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended 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
J(max)
,
θ
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature is P
D
= (T
J-
(max)
–T
A
)/θ
JA
. 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 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
IN
=V
OUT
+1.5V.
Note 8:
The minimum output current required to maintain regulation.
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