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 LLP, TO-263, 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
n
Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
n
Space Saving SOT-223 and LLP Packages
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
0˚C to 125˚C
— LM1117I
−40˚C to 125˚C
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
10091905
Fixed Output Regulator
10091928
October 2002
LM1
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800mA
Low-Dropout
Linear
Regulator
© 2002 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
MP04A
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-1.8
LM1117T-1.8
Rails
LM1117T-2.5
LM1117T-2.5
Rails
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
8-lead LLP
0˚C to +125˚C
LM1117LDX-ADJ
1117ADJ
Tape and Reel
LDC08A
LM1117LDX-1.8
1117-18
Tape and Reel
LM1117LDX-2.5
1117-25
Tape and Reel
LM1117LDX-2.85
1117-28
Tape and Reel
LM1117LDX-3.3
1117-33
Tape and Reel
LM1117LDX-5.0
1117-50
Tape and Reel
−40˚C to 125˚C
LM1117ILDX-ADJ
1117IAD
Tape and Reel
LM1117ILDX-3.3
1117I33
Tape and Reel
LM1117ILDX-5.0
1117I50
Tape and Reel
TO-263
0˚C to +125˚C
LM1117SX-ADJ
LM1117SADJ
Tape and Reel
TS3B
LM1117SX-2.85
LM1117S2.85
Tape and Reel
LM1117SX-3.3
LM1117S3.3
Tape and Reel
LM1117SX-5.0
LM1117S5.0
Tape and Reel
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Block Diagram
10091901
Connection Diagrams
SOT-223
10091904
Top View
TO-220
10091902
Top View
TO-252
10091938
Top View
TO-263
10091944
Top View
10091945
Side View
LLP
10091946
When using the LLP package
Pins 2, 3 & 4 must be connected together and
Pins 5, 6 & 7 must be connected together
Top View
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Absolute Maximum Ratings
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)
20V
Internally Limited
Junction Temperature (T
J
)
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
2000V
Operating Ratings
Input Voltage (V
IN
to GND)
15V
Junction Temperature Range (T
J
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
Typ
Max
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
= 5V T
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
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
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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
Typ
Max
Units
∆V
OUT
Load Regulation
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
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
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
= 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
5
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
15.0
˚C/W
3-Lead TO-220
3.0
˚C/W
3-Lead TO-252
10
˚C/W
Thermal Resistance
Junction-to-Ambient
(No air flow)
3-Lead SOT-223 (No heat sink)
136
˚C/W
3-Lead TO-220 (No heat sink)
79
˚C/W
92
˚C/W
3-Lead TO-263
55
˚C/W
40
˚C/W
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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
Typ
Max
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
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
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
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
LM1117I-ADJ
V
IN
= 15V
1.7
5
mA
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
15.0
˚C/W
3-Lead TO-252
10
˚C/W
Thermal Resistance
Junction-to-Ambient
No air flow)
3-Lead SOT-223 (No heat sink)
136
˚C/W
92
˚C/W
40
˚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.
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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, 1.5k
Ω 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.
Note 9: Minimum pad size of 0.038in
2
Note 10: Thermal Performance for the LLP was obtained using JESD51-7 board with six vias and an ambient temperature of 22˚C. For information about improved
thermal performance and power dissipation for the LLP, refer to Application Note AN-1187.
Typical Performance Characteristics
Dropout Voltage (V
IN
-V
OUT
)
Short-Circuit Current
10091922
10091923
Load Regulation
LM1117-ADJ Ripple Rejection
10091943
10091906
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Typical Performance Characteristics
(Continued)
LM1117-ADJ Ripple Rejection vs. Current
Temperature Stability
10091907
10091925
Adjust Pin Current
LM1117-2.85 Load Transient Response
10091926
10091908
LM1117-5.0 Load Transient Response
LM1117-2.85 Line Transient Response
10091909
10091910
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Typical Performance Characteristics
(Continued)
LM1117-5.0 Line Transient Response
10091911
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/(2
π*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 100-200
Ω. For example,
with R1 = 124
Ω and f
RIPPLE
= 120Hz, the C
ADJ
should be
>
11µF.
1.3 Output Capacitor
The output capacitor is critical in maintaining regulator sta-