LM117JAN
LM117JAN 3-Terminal Adjustable Regulator
Literature Number: SNVS365
LM117JAN
3-Terminal Adjustable Regulator
General Description
The LM117 adjustable 3-terminal positive voltage regulator
is capable of supplying either 0.5A or 1.5A over a 1.2V to
37V output range. It is exceptionally easy to use and re-
quires only two external resistors to set the output voltage.
Further, both line and load regulation are better than stan-
dard fixed regulators.
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 ter-
minal is disconnected.
Normally, no capacitors are needed unless the device is
situated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output
capacitor 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
“floating” and sees only the input-to-output differential volt-
age, supplies of several hundred volts can be regulated as
long as the maximum input to output differential is not ex-
ceeded, i.e., avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching
regulator, 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. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put to 1.2V where most loads draw little current.
For the negative complement, see LM137 series data sheet.
Features
nGuaranteed 0.5A or 1.5A output current
nAdjustable output down to 1.2V
nCurrent limit constant with temperature
n80 dB ripple rejection
nOutput is short-circuit protected
Ordering Information
NS Part Number JAN Part Number NS Package Number Package Description
JL117BXA JM38510/11703BXA H03A 3LD T0–39 Metal Can
JL117SXA JM38510/11703SXA H03A 3LD T0–39 Metal Can
JL117BYA JM38510/11704BYA K02C 2LD T0–3 Metal Can
JL117SYA JM38510/11704SYA K02C 2LD T0–3 Metal Can
Connection Diagrams
(TO-3)
Metal Can Package
(TO-39)
Metal Can Package
20149030
CASE IS OUTPUT
Bottom View
Steel Package
NS Package Number K02C
20149031
CASE IS OUTPUT
Bottom View
NS Package Number H03A
March 2006
LM117JAN 3-Terminal Adjustable Regulator
© 2006 National Semiconductor Corporation DS201490 www.national.com
Connection Diagrams (Continued)
LM117 Series Packages
Part Design
Number Package Load
Suffix Current
K TO-3 1.5A
H T0–39 0.5A
Schematic Diagram
20149008
LM117JAN
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Absolute Maximum Ratings (Note 1)
Power Dissipation (Note 2) Internally Limited
Input-Output Voltage Differential +40V, −0.3V
Storage Temperature −65˚C ≤T
A
≤+150˚C
Maximum Junction Temperature (T
Jmax
) +150˚C
Lead Temperature Metal Package 300˚C
Thermal Resistance
θ
JA
T0–3 Still Air 39˚C/W
T0–3 500LF/Min Air flow 14˚C/W
T0–39 Still Air 186˚C/W
T0–39 500LF/Min Air flow 64˚C/W
θ
JC
T0–3 1.9˚C/W
T0–39 Metal Can 21˚C/W
ESD Tolerance (Note 3) 3KV
Recommended Operating Conditions
Operating Temperature Range −55˚C ≤T
A
≤+125˚C
Input Voltage Range 4.25V to 41.25V
Quality Conformance Inspection
MIL-STD-883, Method 5005 - Group A
Subgroup Description Temp ˚C
1 Static tests at 25
2 Static tests at 125
3 Static tests at -55
4 Dynamic tests at 25
5 Dynamic tests at 125
6 Dynamic tests at -55
7 Functional tests at 25
8A Functional tests at 125
8B Functional tests at -55
9 Switching tests at 25
10 Switching tests at 125
11 Switching tests at -55
12 Settling time at 25
13 Settling time at 125
14 Settling time at -55
LM117JAN
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LM117H JAN Electrical Characteristics
DC Parameters
Symbol Parameter Conditions Notes Min Max Unit Sub-
group
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 4.25V, I
L
= -500mA 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -50mA 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-9.0 9.0 mV 1
-23 23 mV 2, 3
V
RLoad
Load Regulation V
I
= 6.25V,
-500mA ≤I
L
≤-5mA
-12 12 mV 1, 2, 3
V
I
= 41.25V,
-50mA ≤I
L
≤-5mA
-12 12 mV 1, 2, 3
θ
R
Thermal Regulation V
I
= 14.6V, I
L
= -500mA -12 12 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
V
I
= 41.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
∆I
Adj
/ Line Adjust Pin Current Change 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-5.0 5.0 µA 1, 2, 3
∆I
Adj
/ Load Adjust Pin Current Change V
I
= 6.25V,
-500mA ≤I
L
≤-5mA
-5.0 5.0 µA 1, 2, 3
I
OS
Output Short Circuit Current V
I
= 4.25V -1.8 -0.5 A 1, 2, 3
V
I
= 40V -0.5 -0.05 A 1, 2, 3
V
O
Recov Output Voltage Recovery V
I
= 4.25V, R
L
= 2.5Ω,
C
L
= 20µF
1.2 1.3 V 1, 2, 3
V
I
= 40V, R
L
= 250Ω1.2 1.3 V 1, 2, 3
I
Q
Minimum Load Current V
I
= 4.25V,
Forced V
O
= 1.4V
-3.0 -0.5 mA 1, 2, 3
V
I
= 14.25V,
Forced V
O
= 1.4V
-3.0 -0.5 mA 1, 2, 3
V
I
= 41.25V,
Forced V
O
= 1.4V
-5.0 -1.0 mA 1, 2, 3
V
Start
Voltage Start-Up V
I
= 4.25V, R
L
= 2.5Ω,
C
L
=20µF, I
L
= -500mA
1.2 1.3 V 1, 2, 3
V
O
Output Voltage V
I
= 6.25V, I
L
= -5mA (Note 4) 1.2 1.3 V 2
AC Parameters
Symbol Parameter Conditions Notes Min Max Unit Sub-
group
V
NO
Output Noise Voltage V
I
= 6.25V, I
L
= -50mA 120 µV
RMS
7
∆V
O
/∆V
I
Line Transient Response V
I
= 6.25V, ∆V
I
= 3V,
I
L
= -10mA
6 mV/V 7
∆V
O
/∆I
L
Load Transient Response V
I
= 6.25V, ∆I
L
= -200mA,
I
L
= -50mA
0.6 mV/mA 7
∆V
I
/∆V
O
Ripple Rejection V
I
= 6.25V, I
L
= -125mA
e
I
=1V
RMS
at ƒ = 2400Hz,
65 dB 4
LM117JAN
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LM117H JAN Electrical Characteristics (Continued)
DC Drift Parameters
Deltas performed on JAN S devices at Group B, Subgroup 5, only.
Symbol Parameter Conditions Notes Min Max Unit Sub-
group
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 4.25V, I
L
= -500mA -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -50mA -0.01 0.01 V 1
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-4.0 4.0 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -10 10 µA 1
V
I
= 41.25V, I
L
= -5mA -10 10 µA 1
LM117JAN
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LM117K JAN Electrical Characteristics
DC Parameters
Symbol Parameter Conditions Notes Min Max Unit Sub-
group
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 4.25V, I
L
= -1.5A 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -5mA 1.2 1.3 V 1, 2, 3
V
I
= 41.25V, I
L
= -200mA 1.2 1.3 V 1, 2, 3
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-9.0 9.0 mV 1
-23 23 mV 2, 3
V
RLoad
Load Regulation V
I
= 6.25V,
-1.5A ≤I
L
≤-5mA
-3.5 3.5 mV 1
-12 12 mV 2, 3
V
I
= 41.25V,
-200mA ≤I
L
≤-5mA
-3.5 3.5 mV 1
-12 12 mV 2, 3
θ
R
Thermal Regulation V
I
= 14.6V, I
L
= -1.5A -12 12 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
V
I
= 41.25V, I
L
= -5mA -100 -15 µA 1, 2, 3
∆I
Adj
/ Line Adjust Pin Current Change 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-5.0 5.0 µA 1, 2, 3
∆I
Adj
/ Load Adjust Pin Current Change V
I
= 6.25V,
-1.5A ≤I
L
≤-5mA
-5.0 5.0 µA 1, 2, 3
I
OS
Output Short Circuit Current V
I
= 4.25V -3.5 -1.5 A 1, 2, 3
V
I
= 40V -1.0 -0.18 A 1, 2, 3
V
O
Recov Output Voltage Recovery V
I
= 4.25V, R
L
= 0.833Ω,
C
L
= 20µF
1.2 1.3 V 1, 2, 3
V
I
= 40V, R
L
= 250Ω1.2 1.3 V 1, 2, 3
I
Q
Minimum Load Current V
I
= 4.25V,
Forced V
O
= 1.4V
-3.0 -0.2 mA 1, 2, 3
V
I
= 14.25V,
Forced V
O
= 1.4V
-3.0 -0.2 mA 1, 2, 3
V
I
= 41.25V,
Forced V
O
= 1.4V
-5.0 -0.2 mA 1, 2, 3
V
Start
Voltage Start-Up V
I
= 4.25V, R
L
= 0.833Ω,
C
L
=20µF, I
L
= -1.5A
1.2 1.3 V 1, 2, 3
V
O
Output Voltage V
I
= 6.25V, I
L
= -5mA (Note 4) 1.2 1.3 V 2
AC Parameters
Symbol Parameter Conditions Notes Min Max Unit Sub-
group
V
NO
Output Noise Voltage V
I
= 6.25V, I
L
= -100mA 120 µV
RMS
7
∆V
O
/∆V
I
Line Transient Response V
I
= 6.25V, ∆V
I
= 3V,
I
L
= -10mA
(Note 5) 18 mV 7
∆V
O
/∆I
L
Load Transient Response V
I
= 6.25V, ∆I
L
= -400mA,
I
L
= -100mA
(Note 6) 120 mV 7
∆V
I
/∆V
O
Ripple Rejection V
I
= 6.25V, I
L
= -500mA
e
I
=1V
RMS
at ƒ = 2400Hz,
65 dB 4
LM117JAN
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LM117K JAN Electrical Characteristics (Continued)
DC Drift Parameters
Deltas performed on JAN S devices at Group B, Subgroup 5, only.
Symbol Parameter Conditions Notes Min Max Unit Sub-
group
V
O
Output Voltage V
I
= 4.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 4.25V, I
L
= -1.5A -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -5mA -0.01 0.01 V 1
V
I
= 41.25V, I
L
= -200mA -0.01 0.01 V 1
V
RLine
Line Regulation 4.25V ≤V
I
≤41.25V,
I
L
= -5mA
-4.0 4.0 mV 1
I
Adj
Adjust Pin Current V
I
= 4.25V, I
L
= -5mA -10 10 µA 1
V
I
= 41.25V, I
L
= -5mA -10 10 µA 1
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package junction
to ambient thermal resistance), and TA(ambient temperature). The maximum allowable power dissipation at any temperature is PDmax =(T
Jmax -T
A)/θJA or the
number given in the Absolute Maximum Ratings, whichever is lower. "Although power dissipation is internally limited, these specifications are applicable for power
dissipations of 2W for the TO39 package and 20W for the TO3 package."
Note 3: Human body model, 100 pF discharged through a 1.5 kΩresistor.
Note 4: Tested @TA= 125˚C, correlated to TA= 150˚C
Note 5: SS limit of 6mV/V is equivalent to 18mV
Note 6: SS limit of 0.3mV/V is equivalent to 120mV
LM117JAN
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Typical Performance Characteristics Output Capacitor = 0µF unless otherwise noted
Load Regulation Current Limit
20149037 20149038
Adjustment Current Dropout Voltage
20149039 20149040
Temperature Stability Minimum Operating Current
20149041 20149042
LM117JAN
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Typical Performance Characteristics Output Capacitor = 0µF unless otherwise noted (Continued)
Ripple Rejection Ripple Rejection
20149043 20149044
Ripple Rejection Output Impedance
20149045 20149046
Line Transient Response Load Transient Response
20149047 20149048
LM117JAN
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Application Hints
In operation, the LM117 develops a nominal 1.25V reference
voltage, V
REF
, between the output and adjustment terminal.
The reference voltage is impressed across program resistor
R1 and, since the voltage is constant, a constant current I
1
then flows through the output set resistor R2, giving an
output voltage of
Since the 100µA current from the adjustment terminal repre-
sents an error term, the LM117 was designed to minimize
I
ADJ
and make it very constant with line and load changes.
To do this, all quiescent operating current is returned to the
output establishing a minimum load current requirement. If
there is insufficient load on the output, the output will rise.
EXTERNAL CAPACITORS
An input bypass capacitor is recommended. A 0.1µF disc or
1µF solid tantalum on the input is suitable input bypassing
for almost all applications. The device is more sensitive to
the absence of input bypassing when adjustment or output
capacitors are used but the above values will eliminate the
possibility of problems.
The adjustment terminal can be bypassed to ground on the
LM117 to improve ripple rejection. This bypass capacitor
prevents ripple from being amplified as the output voltage is
increased. With a 10µF bypass capacitor 80dB ripple rejec-
tion is obtainable at any output level. Increases over 10µF do
not appreciably improve the ripple rejection at frequencies
above 120Hz. If the bypass capacitor is used, it is some-
times necessary to include protection diodes to prevent the
capacitor from discharging through internal low current paths
and damaging the device.
In general, the best type of capacitors to use is solid tanta-
lum. Solid tantalum capacitors have low impedance even at
high frequencies. Depending upon capacitor construction, it
takes about 25µF in aluminum electrolytic to equal 1µF solid
tantalum at high frequencies. Ceramic capacitors are also
good at high frequencies; but some types have a large
decrease in capacitance at frequencies around 0.5MHz. For
this reason, 0.01µF disc may seem to work better than a
0.1µF disc as a bypass.
Although the LM117 is stable with no output capacitors, like
any feedback circuit, certain values of external capacitance
can cause excessive ringing. This occurs with values be-
tween 500 pF and 5000 pF. A 1µF solid tantalum (or 25µF
aluminum electrolytic) on the output swamps this effect and
insures stability. Any increase of the load capacitance larger
than 10µF will merely improve the loop stability and output
impedance.
LOAD REGULATION
The LM117 is capable of providing extremely good load
regulation but a few precautions are needed to obtain maxi-
mum performance. The current set resistor connected be-
tween the adjustment terminal and the output terminal (usu-
ally 240Ω) should be tied directly to the output (case) of the
regulator rather than near the load. This eliminates line
drops from appearing effectively in series with the reference
and degrading regulation. For example, a 15V regulator with
0.05Ωresistance between the regulator and load will have a
load regulation due to line resistance of 0.05ΩxI
L
. If the set
resistor is connected near the load the effective line resis-
tance will be 0.05Ω(1 + R2/R1) or in this case, 11.5 times
worse.
Figure 2 shows the effect of resistance between the regula-
tor and 240Ωset resistor.
With the TO-3 package, it is easy to minimize the resistance
from the case to the set resistor, by using two separate leads
to the case. However, with the TO-39 package, care should
be taken to minimize the wire length of the output lead. The
ground of R2 can be returned near the ground of the load to
provide remote ground sensing and improve load regulation.
PROTECTION DIODES
When external capacitors are used with any IC regulator it is
sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator. Most 10µF capacitors have low enough
internal series resistance to deliver 20A spikes when
shorted. Although the surge is short, there is enough energy
to damage parts of the IC.
When an output capacitor is connected to a regulator and
the input is shorted, the output capacitor will discharge into
the output of the regulator. The discharge current depends
on the value of the capacitor, the output voltage of the
regulator, and the rate of decrease of V
IN
. In the LM117, this
discharge path is through a large junction that is able to
sustain 15A surge with no problem. This is not true of other
types of positive regulators. For output capacitors of 25µF or
less, there is no need to use diodes.
The bypass capacitor on the adjustment terminal can dis-
charge through a low current junction. Discharge occurs
20149005
FIGURE 1.
20149006
FIGURE 2. Regulator with Line Resistance in Output
Lead
LM117JAN
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Application Hints (Continued)
when either the input or output is shorted. Internal to the
LM117 is a 50Ωresistor which limits the peak discharge
current. No protection is needed for output voltages of 25V
or less and 10µF capacitance. Figure 3 shows an LM117
with protection diodes included for use with outputs greater
than 25V and high values of output capacitance.
When a value for θ
(H−A)
is found using the equation shown,
a heatsink must be selected that has a value that is less than
or equal to this number.
θ
(H−A)
is specified numerically by the heatsink manufacturer
in the catalog, or shown in a curve that plots temperature rise
vs power dissipation for the heatsink.
Typical Applications
5V Logic Regulator with Electronic Shutdown* Slow Turn-On 15V Regulator
20149003
*Min. output )1.2V
20149009
Adjustable Regulator with Improved Ripple Rejection
20149010
†Solid tantalum
*Discharges C1 if output is shorted to ground
20149007
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
LM117JAN
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Typical Applications (Continued)
High Stability 10V Regulator
20149011
High Current Adjustable Regulator
20149012
‡Optional — improves ripple rejection
†Solid tantalum
*Minimum load current = 30 mA
LM117JAN
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Typical Applications (Continued)
0 to 30V Regulator
20149013
Full output current not available at high input-output voltages
Power Follower
20149014
5A Constant Voltage/Constant Current Regulator
20149015
†Solid tantalum
*Lights in constant current mode
LM117JAN
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Typical Applications (Continued)
1A Current Regulator 1.2V–20V Regulator with Minimum Program Current
20149016 20149017
*Minimum load current )4mA
High Gain Amplifier
20149018
Low Cost 3A Switching Regulator
20149019
†Solid tantalum
*Core — Arnold A-254168-2 60 turns
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Typical Applications (Continued)
4A Switching Regulator with Overload Protection
20149020
†Solid tantalum
*Core — Arnold A-254168-2 60 turns
Precision Current Limiter
20149021
Tracking Preregulator
20149022
LM117JAN
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Typical Applications (Continued)
Current Limited Voltage Regulator
20149023
(Compared to LM117’s higher current limit)
— At 50 mA output only
3
⁄
4
volt of drop occurs in R3and R4
Adjusting Multiple On-Card Regulators with Single Control*
20149024
*All outputs within ±100 mV
†Minimum load — 10 mA
LM117JAN
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Typical Applications (Continued)
AC Voltage Regulator
20149025
12V Battery Charger
20149026
Use of RSallows low charging rates with fully charged battery.
50mA Constant Current Battery Charger
20149027
LM117JAN
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Typical Applications (Continued)
Adjustable 4A Regulator
20149028
1.2V–25V Adjustable Regulator
20149001
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.
Current Limited 6V Charger
20149029
*Sets peak current (0.6A for 1Ω)
**The 1000µF is recommended to filter out input transients
Digitally Selected Outputs
20149002
*Sets maximum VOUT
LM117JAN
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Revision History
Date
Released Revision Section Originator Changes
03/14/06 A New Release to corporate format L. Lytle
2 MDS data sheets were consolidated into
one corporate data sheet format.
MJLM117–K Rev 0C1 and MJLM117–H
Rev 1A1 will be archived.
LM117JAN
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Physical Dimensions inches (millimeters) unless otherwise noted
TO-3 Metal Can Package (K)
NS Package Number K02C
(TO-39) Metal Can Package
NS Package Number H03A
LM117JAN
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Notes
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.
For the most current product information visit us at www.national.com.
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LM117JAN 3-Terminal Adjustable Regulator
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