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LM117/LM317A/LM317 3-Terminal Adjustable Regulator
February 25, 2011
LM117/LM317A/LM317
3-Terminal Adjustable Regulator
General Description
The LM117 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 1.5A over a
1.2V to 37V output range. They are exceptionally easy to use
and require only two external resistors to set the output volt-
age. Further, both line and load regulation are better than
standard fixed regulators. Also, the LM117 is packaged in
standard transistor packages which are easily mounted and
handled.
In addition to higher performance than fixed regulators, the
LM117 series offers full overload protection available only in
IC's. Included on the chip are current limit, thermal overload
protection and safe area protection. All overload protection
circuitry remains fully functional even if the adjustment termi-
nal is disconnected.
Normally, no capacitors are needed unless the device is sit-
uated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output ca-
pacitor can be added to improve transient response. The
adjustment terminal can be bypassed to achieve very high
ripple rejection ratios which are difficult to achieve with stan-
dard 3-terminal regulators.
Besides replacing fixed regulators, the LM117 is useful in a
wide variety of other applications. Since the regulator is “float-
ing” and sees only the input-to-output differential voltage,
supplies of several hundred volts can be regulated as long as
the maximum input to output differential is not exceeded, i.e.,
avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching reg-
ulator, a programmable output regulator, or by connecting a
fixed resistor between the adjustment pin and output, the
LM117 can be used as a precision current regulator. Supplies
with electronic shutdown can be achieved by clamping the
adjustment terminal to ground which programs the output to
1.2V where most loads draw little current.
For applications requiring greater output current, see LM150
series (3A) and LM138 series (5A) data sheets. For the neg-
ative complement, see LM137 series data sheet.
Features
■
■
■
■
■
■
■
■
■
Guaranteed 1% output voltage tolerance (LM317A)
Guaranteed max. 0.01%/V line regulation (LM317A)
Guaranteed max. 0.3% load regulation (LM117)
Guaranteed 1.5A output current
Adjustable output down to 1.2V
Current limit constant with temperature
P
+
Product Enhancement tested
80 dB ripple rejection
Output is short-circuit protected
Typical Applications
1.2V–25V Adjustable Regulator
LM117/LM317A/LM317 Package Options
Part
Number
LM117, LM317
LM317A, LM317
LM317
LM317A, LM317
LM117, LM317A, LM317
LM117
LM317A, LM317
Suffix
K
T
S
EMP
H
E
MDT
Package
TO-3
TO-220
TO-263
SOT-223
TO-39
LCC
TO-252
Output
Current
1.5A
1.5A
1.5A
1.0A
0.5A
0.5A
0.5A
906301
SOT-223 vs. TO-252 (D-Pak)
Packages
Full output current not available at high input-output voltages
*Needed if device is more than 6 inches from filter capacitors.
†Optional—improves transient response. Output capacitors in the range
of 1μF to 1000μF of aluminum or tantalum electrolytic are commonly used
to provide improved output impedance and rejection of transients.
906354
Scale 1:1
© 2011 National Semiconductor Corporation
9063
www.national.com
LM117/LM317A/LM317
Absolute Maximum Ratings
(Note
1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Internally Limited
Input-Output Voltage Differential
+40V, −0.3V
Storage Temperature
−65°C to +150°C
Lead Temperature
Metal Package (Soldering, 10 seconds)
300°C
Plastic Package (Soldering, 4 seconds)
260°C
ESD Tolerance (Note
5)
3 kV
Operating Temperature Range
LM117
LM317A
LM317
Preconditioning
Thermal Limit Burn-In
All Devices 100%
−55°C
≤
T
J
≤
+150°C
−40°C
≤
T
J
≤
+125°C
0°C
≤
T
J
≤
+125°C
(Note
3)
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating Temperature
Range.
Unless otherwise specified, V
IN
− V
OUT
= 5V, and I
OUT
= 10 mA.
Parameter
Reference Voltage
Line Regulation
Load Regulation
Thermal Regulation
Adjustment Pin Current
Adjustment Pin Current Change
Temperature Stability
Minimum Load Current
10 mA
≤
I
OUT
≤
I
MAX
(Note
3)
3V
≤
(V
IN
− V
OUT
)
≤
40V
T
MIN
≤
T
J
≤
T
MAX
(V
IN
− V
OUT
) = 40V
(V
IN
− V
OUT
)
≤
15V
Current Limit
K Package
H, E Package
(V
IN
− V
OUT
) = 40V
K Package
H, E Package
RMS Output Noise, % of V
OUT
Ripple Rejection Ratio
Long-Term Stability
Thermal Resistance,
θ
JC
Junction-to-Case
Thermal Resistance,
θ
JA
Junction-to-Ambient
(No Heat Sink)
10 Hz
≤
f
≤
10 kHz
V
OUT
= 10V, f = 120 Hz, C
ADJ
= 0 μF
V
OUT
= 10V, f = 120 Hz, C
ADJ
= 10 μF
T
J
= 125°C, 1000 hrs
K (TO-3) Package
H (TO-39) Package
E (LCC) Package
K (TO-3) Package
H (TO-39) Package
E (LCC) Package
66
0.3
0.15
0.4
0.20
0.003
65
80
0.3
2
21
12
39
186
88
1
A
%
dB
dB
%
°C/W
1.5
0.5
2.2
0.8
3.4
1.8
A
Conditions
3V
≤
(V
IN
− V
OUT
)
≤
40V,
LM117
(Note
2)
Min
1.20
Typ
1.25
0.01
0.02
0.1
0.3
0.03
50
0.2
1
3.5
5
Max
1.30
0.02
0.05
0.3
1
0.07
100
5
Units
V
%/V
%
%/W
μA
μA
%
mA
LM117 Electrical Characteristics
10 mA
≤
I
OUT
≤
I
MAX
(Note
3)
3V
≤
(V
IN
− V
OUT
)
≤
40V (Note
4)
10 mA
≤
I
OUT
≤
I
MAX
(Note
3, Note 4)
20 ms Pulse
°C/W
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Embedded System
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