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 10F tantalum ca-
pacitor is required at the output to improve the transient
response and stability.
Features
n
Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
n
Space Saving SOT-223 Package
n
Current Limiting and Thermal Protection
n
Output Current
800mA
n
Line Regulation
0.2% (Max)
n
Load Regulation
0.4% (Max)
n
Temperature Range
-- LM1117
0C to 125C
-- LM1117I
-40C to 125C
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
April 2001
LM1
1
17/LM1
1
17I
800mA
Low-Dropout
Linear
Regulator
2001 National Semiconductor Corporation
DS100919
www.national.com
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-5.0
20V
Power Dissipation (Note 2)
Internally Limited
Junction Temperature (T
J
)
(Note 2)
150C
Storage Temperature Range
-65C to 150C
Lead Temperature
TO-220 (T) Package
260C, 10 sec
SOT-223 (IMP) Package
260C, 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-5.0
15V
LM1117-2.85
10V
Junction Temperature Range (T
J
)(Note 2)
LM1117
0C to 125C
LM1117I
-40C to 125C
LM1117 Electrical Characteristics
Typicals and limits appearing in normal type apply for T
J
= 25C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation, 0C to 125C.
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
= 25C
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
= 25C
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
= 25C
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
= 25C
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
= 5V T
J
= 25C
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
= 25C
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
1
6
mV
LM1117-2.5
I
OUT
= 0mA, 3.9V
V
IN
10V
1
6
mV
LM1117-2.85
I
OUT
= 0mA, 4.25V
V
IN
10V
1
6
mV
LM1117-3.3
I
OUT
= 0mA, 4.75V
V
IN
15V
1
6
mV
LM1117-5.0
I
OUT
= 0mA, 6.5V
V
IN
15V
1
10
mV
LM1
1
17/LM1
1
17I
www.national.com
4
LM1117 Electrical Characteristics
(Continued)
Typicals and limits appearing in normal type apply for T
J
= 25C. Limits appearing in Boldface type apply over the entire junc-
tion temperature range for operation, 0C to 125C.
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
1
10
mV
LM1117-2.5
V
IN
= 3.9V, 0
I
OUT
800mA
1
10
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
= 25C
800
1200
1500
mA
Minimum Load
Current (Note 8)
LM1117-ADJ
V
IN
= 15V
1.7
5
mA
Quiescent Current
LM1117-1.8
V
IN
15V
5
10
mA
LM1117-2.5
V
IN
15V
5
10
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
= 25C, 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
A
Adjust Pin Current
Change
10
I
OUT
800mA,
1.4V
V
IN
-V
OUT
10V
0.2
5
A
Temperature Stability
0.5
%
Long Term Stability
T
A
= 125C, 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
LM1
1
17/LM1
1
17I
www.national.com
5
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