NSC LM317T 3-terminal adjustable regulator Datasheet

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 voltage. 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 terminal 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 standard 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 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 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. 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 negative 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
LM117/LM317A/LM317 Package Options
Typical Applications
1.2V–25V Adjustable Regulator
906301
Part
Number
Suffix
Package
Output
Current
LM117, LM317
LM317A, LM317
K
TO-3
1.5A
T
TO-220
1.5A
LM317
S
TO-263
1.5A
LM317A, LM317
EMP
SOT-223
1.0A
LM117, LM317A, LM317
H
TO-39
0.5A
LM117
E
LCC
0.5A
LM317A, LM317
MDT
TO-252
0.5A
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
© 2008 National Semiconductor Corporation
9063
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LM117/LM317A/LM317 3-Terminal Adjustable Regulator
October 20, 2008
LM117/LM317A/LM317
Connection Diagrams
TO-3 (K)
Metal Can Package
TO-39 (H)
Metal Can Package
906331
CASE IS OUTPUT
Bottom View
NS Package Number H03A
906330
CASE IS OUTPUT
Bottom View
Steel Package
NS Package Number K02A or K02C
TO-263 (S)
Surface-Mount Package
TO-220 (T)
Plastic Package
906335
Top View
906332
Front View
NS Package Number T03B
TO-263 (S)
Surface-Mount Package
Ceramic Leadless
Chip Carrier (E)
906336
Side View
NS Package Number TS3B
906334
Top View
NS Package Number E20A
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2
LM117/LM317A/LM317
4-Lead SOT-223 (EMP)
TO-252 (MDT)
906359
Front View
NS Package Number MP04A
906366
Front View
NS Package Number TD03B
Ordering Information
Package
TO-3
Metal Can
(K)
TO-220
3- Lead
TO-263
3- Lead
SOT-223
4- Lead
TO-39
Metal Can
(H)
LCC
TO-252
3- Lead
D-Pack
Temperature
Range
Output
Current
Order
Number
Package
Marking
Transport
Media
−55°C ≤ TJ ≤ +150°C
1.5A
LM117K STEEL
LM117K STEEL P+
50 Per Bag
0°C ≤ TJ ≤ +125°C
1.5A
LM317K STEEL
LM317K STEEL P+
50 Per Bag
−55°C ≤ TJ ≤ +150°C
1.5A
LM117K/883
LM117K/883
50 Per Bag
−40°C ≤ TJ ≤ +125°C
1.5A
LM317AT
LM317AT P+
45 Units/Rail
0°C ≤ TJ ≤ +125°C
1.5A
LM317T
LM317T P+
45 Units/Rail
0°C ≤ TJ ≤ +125°C
1.5A
0°C ≤ TJ ≤ +125°C
1.0A
LM317S
LM317S P+
LM317SX
LM317EMP
N01A
LM317EMPX
LM317AEMP
2k Units Tape and Reel
LM117H
LM117H P+
500 Per Box
−55°C ≤ TJ ≤ +150°C
0.5A
LM117H/883
LM117H/883
20 Per Tray
−40°C ≤ TJ ≤ +125°C
0.5A
LM317AH
LM317AH P+
500 Per Box
0°C ≤ TJ ≤ +125°C
0.5A
LM317H
LM317H P+
500 Per Box
−55°C ≤ TJ ≤ +150°C
0.5A
LM117E/883
LM117E/883
50 Units/Rail
0°C ≤ TJ ≤ +125°C
0.5A
−40°C ≤ TJ ≤ +125°C
0.5A
LM317MDT
LM317AMDT
LM317AMDT
LM317AMDTX
3
TS3B
MP04A
1k Units Tape and Reel
0.5A
LM317MDT
T03B
1k Units Tape and Reel
−55°C ≤ TJ ≤ +150°C
LM317MDTX
K02C
500 Units Tape and Reel
1.0A
LM317AEMPX
K02A
45 Units/Rail
−40°C ≤ TJ ≤ +125°C
N07A
NSC
Drawing
2k Units Tape and Reel
H03A
E20A
75 Units/Rail
2.5k Units Tape and Reel
75 Units/Rail
TD03B
2.5k Units Tape and Reel
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LM117/LM317A/LM317
Operating Temperature Range
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
−55°C ≤ TJ ≤ +150°C
LM117
−40°C ≤ TJ ≤ +125°C
LM317A
0°C ≤ TJ ≤ +125°C
LM317
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
Preconditioning
Thermal Limit Burn-In
All Devices 100%
LM117 Electrical Characteristics
(Note 3)
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.
Parameter
Reference Voltage
Conditions
3V ≤ (VIN − VOUT) ≤ 40V,
10 mA ≤ IOUT ≤ IMAX
LM117 (Note 2)
Min
Typ
Max
Units
1.20
1.25
1.30
V
Line Regulation
3V ≤ (VIN − VOUT) ≤ 40V (Note 4)
0.01
0.02
0.02
0.05
%/V
Load Regulation
10 mA ≤ IOUT ≤ IMAX (Note 4)
0.1
0.3
0.3
1
%
Thermal Regulation
20 ms Pulse
0.03
0.07
%/W
50
100
μA
0.2
5
μA
Adjustment Pin Current
Adjustment Pin Current Change
10 mA ≤ IOUT ≤ IMAX
3V ≤ (VIN − VOUT) ≤ 40V
Temperature Stability
TMIN ≤ TJ ≤ TMAX
Minimum Load Current
(VIN − VOUT) = 40V
%
1
3.5
5
mA
1.5
0.5
2.2
0.8
3.4
1.8
A
0.3
0.15
0.4
0.20
A
0.003
%
65
dB
80
dB
(VIN − VOUT) ≤ 15V
Current Limit
K Package
H, E Package
(VIN − VOUT) = 40V
K Package
H, E Package
RMS Output Noise, % of VOUT
Ripple Rejection Ratio
10 Hz ≤ f ≤ 10 kHz
VOUT = 10V, f = 120 Hz, CADJ = 0 μF
VOUT = 10V, f = 120 Hz, CADJ = 10 μF
66
Long-Term Stability
TJ = 125°C, 1000 hrs
0.3
Thermal Resistance, θJC
Junction-to-Case
K (TO-3) Package
H (TO-39) Package
E (LCC) Package
2
21
12
°C/W
Thermal Resistance, θJA
Junction-to-Ambient
(No Heat Sink)
K (TO-3) Package
H (TO-39) Package
E (LCC) Package
39
186
88
°C/W
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4
1
%
(Note 3)
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.
Parameter
Reference Voltage
LM317A
Conditions
3V ≤ (VIN − VOUT) ≤ 40V,
10 mA ≤ IOUT ≤ IMAX
LM317
Min
Typ
Max
Min
Typ
Max
Units
1.238
1.250
1.262
-
1.25
-
V
1.225
1.250
1.270
1.20
1.25
1.30
V
0.005
0.01
0.01
0.02
0.01
0.02
0.04
0.07
%/V
Line Regulation
3V ≤ (VIN − VOUT) ≤ 40V (Note 4)
Load Regulation
10 mA ≤ IOUT ≤ IMAX (Note 4)
0.1
0.3
0.5
1
0.1
0.3
0.5
1.5
%
Thermal Regulation
20 ms Pulse
0.04
0.07
0.04
0.07
%/W
50
100
50
100
μA
0.2
5
0.2
5
μA
Adjustment Pin Current
Adjustment Pin Current Change
10 mA ≤ IOUT ≤ IMAX
3V ≤ (VIN − VOUT) ≤ 40V
Temperature Stability
TMIN ≤ TJ ≤ TMAX
Minimum Load Current
(VIN − VOUT) = 40V
1
%
1
3.5
10
mA
1.5
1.5
0.5
2.2
2.2
0.8
3.4
3.4
1.8
A
0.15
0.112
0.075
0.40
0.30
0.20
A
0.003
0.003
%
65
65
dB
80
dB
3.5
10
1.5
0.5
2.2
0.8
3.4
1.8
0.112
0.075
0.30
0.20
(VIN − VOUT) ≤ 15V
Current Limit
K, T, S Packages
EMP Package
H, MDT Packages
(VIN − VOUT) = 40V
K, T, S Packages
EMP Package
H, MDT Packages
RMS Output Noise, % of VOUT
Ripple Rejection Ratio
10 Hz ≤ f ≤ 10 kHz
VOUT = 10V, f = 120 Hz, CADJ = 0 μF
VOUT = 10V, f = 120 Hz, CADJ = 10 μF
66
80
66
Long-Term Stability
TJ = 125°C, 1000 hrs
0.3
Thermal Resistance, θJC
Junction-to-Case
K (TO-3) Package
T (TO-220) Package
S (TO-263) Package
EMP (SOT-223) Package
H (TO-39) Package
MDT (TO-252) Package
23.5
21
12
2
4
4
23.5
21
12
°C/W
Thermal Resistance, θJA
Junction-to-Ambient
(No Heat Sink)
K (TO-3) Package
T (TO-220) Package
S (TO-263) Package (Note 6)
EMP (SOT-223) Package (Note 6)
H (TO-39) Package
MDT (TO-252) Package (Note 6)
140
186
103
39
50
50
140
186
103
°C/W
1
0.3
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
intended to be 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.
Note 2: Refer to RETS117H drawing for the LM117H, or the RETS117K for the LM117K military specifications.
Note 3: IMAX = 1.5A for the K (TO-3), T (TO-220), and S (TO-263) packages. IMAX = 1.0A for the EMP (SOT-223) package. IMAX = 0.5A for the H (TO-39), MDT
(TO-252), and E (LCC) packages. Device power dissipation (PD) is limited by ambient temperature (TA), device maximum junction temperature (TJ), and package
thermal resistance (θJA). The maximum allowable power dissipation at any temperature is : PD(MAX) = ((TJ(MAX) - TA)/θJA). All Min. and Max. limits are guaranteed
to National's Average Outgoing Quality Level (AOQL).
Note 4: Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects
are covered under the specifications for thermal regulation.
Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 6: When surface mount packages are used (TO-263, SOT-223, TO-252), the junction to ambient thermal resistance can be reduced by increasing the PC
board copper area that is thermally connected to the package. See the Applications Hints section for heatsink techniques.
5
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LM117/LM317A/LM317
LM317A and LM317 Electrical Characteristics
LM117/LM317A/LM317
Typical Performance Characteristics
Output Capacitor = 0 μF unless otherwise noted
Load Regulation
Current Limit
906337
906338
Adjustment Current
Dropout Voltage
906340
906339
VOUT vs VIN, VOUT = VREF
VOUT vs VIN, VOUT = 5V
906367
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906368
6
LM117/LM317A/LM317
Temperature Stability
Minimum Operating Current
906341
906342
Ripple Rejection
Ripple Rejection
906344
906343
Ripple Rejection
Output Impedance
906346
906345
7
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LM117/LM317A/LM317
Line Transient Response
Load Transient Response
906347
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906348
8
In operation, the LM117 develops a nominal 1.25V reference
voltage, VREF, between the output and adjustment terminal.
The reference voltage is impressed across program resistor
R1 and, since the voltage is constant, a constant current I1
then flows through the output set resistor R2, giving an output
voltage of
LOAD REGULATION
The LM117 is capable of providing extremely good load regulation but a few precautions are needed to obtain maximum
performance. The current set resistor connected between the
adjustment terminal and the output terminal (usually 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 0.05Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05Ω × IL. If the set resistor is
connected near the load the effective line resistance will be
0.05Ω (1 + R2/R1) or in this case, 11.5 times worse.
Figure 2 shows the effect of resistance between the regulator
and 240Ω set resistor.
(1)
906305
FIGURE 1.
Since the 100μA current from the adjustment terminal represents an error term, the LM117 was designed to minimize
IADJ 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.
906306
FIGURE 2. Regulator with Line Resistance in Output Lead
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.
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 10 μF bypass capacitor 80dB ripple rejection is obtainable at any output level. Increases over 10 μF do
not appreciably improve the ripple rejection at frequencies
above 120Hz. If the bypass capacitor is used, it is sometimes
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 tantalum.
Solid tantalum capacitors have low impedance even at high
frequencies. Depending upon capacitor construction, it takes
about 25 μF 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 0.5 MHz. For this reason,
0.01 μF disc may seem to work better than a 0.1 μF 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 between 500 pF and 5000 pF. A 1 μF solid tantalum (or 25 μF
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 10 μF 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 VIN. 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 25 μF or less, there is no
need to use diodes.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs when
either the input, or the output, is shorted. Internal to the LM117
is a 50Ω resistor which limits the peak discharge current. No
protection is needed for output voltages of 25V or less and 10
μF capacitance. Figure 3 shows an LM117 with protection
9
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LM117/LM317A/LM317
aluminum electrolytic) on the output swamps this effect and
insures stability. Any increase of the load capacitance larger
than 10 μF will merely improve the loop stability and output
impedance.
Application Hints
LM117/LM317A/LM317
diodes included for use with outputs greater than 25V and
high values of output capacitance.
906360
FIGURE 4. Power Dissipation Diagram
If the calculated maximum allowable thermal resistance is
higher than the actual package rating, then no additional work
is needed. If the calculated maximum allowable thermal resistance is lower than the actual package rating either the
power dissipation (PD) needs to be reduced, the maximum
ambient temperature TA(MAX) needs to be reduced, the thermal resistance (θJA) must be lowered by adding a heatsink,
or some combination of these.
If a heatsink is needed, the value can be calculated from the
formula:
906307
(2)
D1 protects against C1
D2 protects against C2
FIGURE 3. Regulator with Protection Diodes
HEATSINK REQUIREMENTS
The LM317 regulators have internal thermal shutdown to protect the device from over-heating. Under all operating conditions, the junction temperature of the LM317 should not
exceed the rated maximum junction temperature (TJ) of 150°
C for the LM117, or 125°C for the LM317A and LM317. A
heatsink may be required depending on the maximum device
power dissipation and the maximum ambient temperature of
the application. To determine if a heatsink is needed, the
power dissipated by the regulator, PD, must be calculated:
PD = ((VIN − VOUT) × IL) + (VIN × IG)
θHA ≤ (θJA - (θCH + θJC))
where (θCH is the thermal resistance of the contact area between the device case and the heatsink surface, and θJC is
thermal resistance from the junction of the die to surface of
the package case.
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.
The θ(H−A) rating 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.
(3)
Figure 4 shows the voltage and currents which are present in
the circuit.
The next parameter which must be calculated is the maximum
allowable temperature rise, TR(MAX):
TR(MAX) = TJ(MAX) − TA(MAX)
HEATSINKING SURFACE MOUNT PACKAGES
The TO-263 (S), SOT-223 (EMP) and TO-252 (MDT) packages use a copper plane on the PCB and the PCB itself as a
heatsink. To optimize the heat sinking ability of the plane and
PCB, solder the tab of the package to the plane.
(4)
HEATSINKING THE SOT-223 PACKAGE
Figure 5 and Figure 6 show the information for the SOT-223
package. Figure 6 assumes a θ(J−A) of 74°C/W for 1 ounce
copper and 51°C/W for 2 ounce copper and a maximum junction temperature of 125°C. Please see AN-1028 for thermal
enhancement techniques to be used with SOT-223 and
TO-252 packages.
where TJ(MAX) is the maximum allowable junction temperature
(150°C for the LM117, or 125°C for the LM317A/LM317), and
TA(MAX) is the maximum ambient temperature which will be
encountered in the application.
Using the calculated values for TR(MAX) and PD, the maximum
allowable value for the junction-to-ambient thermal resistance
(θJA) can be calculated:
θJA = (TR(MAX) / PD)
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(6)
(5)
10
LM117/LM317A/LM317
906357
906355
FIGURE 7. θ(J−A) vs Copper (1 ounce) Area for the TO-263
Package
FIGURE 5. θ(J−A) vs Copper (2 ounce) Area for the
SOT-223 Package
As a design aid, Figure 8 shows the maximum allowable power dissipation compared to ambient temperature for the
TO-263 device (assuming θ(J−A) is 35°C/W and the maximum
junction temperature is 125°C).
906358
FIGURE 6. Maximum Power Dissipation vs TAMB for the
SOT-223 Package
HEATSINKING THE TO-263 PACKAGE
Figure 7 shows for the TO-263 the measured values of θ(J
−A) for different copper area sizes using a typical PCB with 1
ounce copper and no solder mask over the copper area used
for heatsinking.
As shown in Figure 7, increasing the copper area beyond 1
square inch produces very little improvement. It should also
be observed that the minimum value of θ(J−A) for the TO-263
package mounted to a PCB is 32°C/W.
906356
FIGURE 8. Maximum Power Dissipation vs TAMB for the
TO-263 Package
HEATSINKING THE TO-252 PACKAGE
If the maximum allowable value for θJA is found to be ≥103°
C/W (Typical Rated Value) for TO-252 package, no heatsink
is needed since the package alone will dissipate enough heat
to satisfy these requirements. If the calculated value for θJA
falls below these limits, a heatsink is required.
As a design aid, Table 1 shows the value of the θJA of TO-252
for different heatsink area. The copper patterns that we used
to measure these θJAs are shown at the end of the Application
Notes Section. Figure 9 reflects the same test results as what
are in Table 1.
Figure 10 shows the maximum allowable power dissipation
vs. ambient temperature for the TO-252 device. Figure 11
shows the maximum allowable power dissipation vs. copper
area (in2) for the TO-252 device. Please see AN-1028 for
thermal enhancement techniques to be used with SOT-223
and TO-252 packages.
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LM117/LM317A/LM317
TABLE 1. θJA Different Heatsink Area
Layout
Copper Area
Top Side
(in2)*
Thermal Resistance
Bottom Side
(in2)
(θJA°C/W) TO-252
1
0.0123
0
103
2
0.066
0
87
3
0.3
0
60
4
0.53
0
54
5
0.76
0
52
6
1.0
0
47
7
0.066
0.2
84
8
0.066
0.4
70
9
0.066
0.6
63
10
0.066
0.8
57
11
0.066
1.0
57
12
0.066
0.066
89
13
0.175
0.175
72
14
0.284
0.284
61
15
0.392
0.392
55
16
0.5
0.5
53
Note: * Tab of device attached to topside of copper.
906361
FIGURE 9. θJA vs 2oz Copper Area for TO-252
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12
LM117/LM317A/LM317
906363
FIGURE 10. Maximum Allowable Power Dissipation vs. Ambient Temperature for TO-252
906362
FIGURE 11. Maximum Allowable Power Dissipation vs. 2oz Copper Area for TO-252
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LM117/LM317A/LM317
906364
FIGURE 12. Top View of the Thermal Test Pattern in Actual Scale
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14
LM117/LM317A/LM317
906365
FIGURE 13. Bottom View of the Thermal Test Pattern in Actual Scale
Schematic Diagram
906308
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LM117/LM317A/LM317
†Solid tantalum
*Discharges C1 if output is shorted to ground
Typical Applications
High Stability 10V Regulator
5V Logic Regulator with Electronic Shutdown*
*Min. output ≊ 1.2V
906303
Slow Turn-On 15V Regulator
906311
906309
Adjustable Regulator with Improved Ripple Rejection
906310
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16
LM117/LM317A/LM317
High Current Adjustable Regulator
906312
‡Optional—improves ripple rejection
†Solid tantalum
*Minimum load current = 30 mA
0 to 30V Regulator
Power Follower
906313
906314
Full output current not available at high input-output voltages
17
www.national.com
LM117/LM317A/LM317
5A Constant Voltage/Constant Current Regulator
906315
†Solid tantalum
*Lights in constant current mode
*Minimum load current ≊ 4 mA
1A Current Regulator
High Gain Amplifier
906316
1.2V–20V Regulator with Minimum Program Current
906318
906317
www.national.com
18
LM117/LM317A/LM317
Low Cost 3A Switching Regulator
906319
†Solid tantalum
*Core—Arnold A-254168-2 60 turns
4A Switching Regulator with Overload Protection
906320
†Solid tantalum
*Core—Arnold A-254168-2 60 turns
Precision Current Limiter
906321
19
www.national.com
LM117/LM317A/LM317
Tracking Preregulator
906322
Current Limited Voltage Regulator
906323
(Compared to LM117's higher current limit)
—At 50 mA output only ¾ volt of drop occurs in R3 and R4
Adjusting Multiple On-Card Regulators with Single Control*
906324
*All outputs within ±100 mV
†Minimum load—10 mA
www.national.com
20
LM117/LM317A/LM317
AC Voltage Regulator
906325
12V Battery Charger
906326
Use of RS allows low charging rates with fully charged battery.
50mA Constant Current Battery Charger
906327
21
www.national.com
LM117/LM317A/LM317
Adjustable 4A Regulator
906328
Current Limited 6V Charger
Digitally Selected Outputs
906329
*Sets peak current (0.6A for 1Ω)
**The 1000μF is recommended to filter out input transients
www.national.com
906302
*Sets maximum VOUT
22
LM117/LM317A/LM317
Physical Dimensions inches (millimeters) unless otherwise noted
TO-3 Metal Can Package (K)
NS Package Number K02A
TO-3 Metal Can Package (K)
Mil-Aero Product
NS Package Number K02C
23
www.national.com
LM117/LM317A/LM317
TO-39 Metal Can Package (H)
NS Package Number H03A
3-Lead TO-220 (T)
NS Package Number T03B
www.national.com
24
LM117/LM317A/LM317
3-Lead TO-263 (S)
NS Package Number TS3B
Ceramic Leadless Chip Carrier (E)
NS Package Number E20A
25
www.national.com
LM117/LM317A/LM317
4-Lead SOT-223 (EMP)
NS Package Number MP04A
3-Lead D-Pack (MDT)
NS Package Number TD03B
www.national.com
26
LM117/LM317A/LM317
Notes
27
www.national.com
LM117/LM317A/LM317 3-Terminal Adjustable Regulator
Notes
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