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LM117/LM317A/LM317 3-Terminal Adjustable Regulator
May 2003
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
n n n n n n n n n 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 Series Packages Part Number Suffix K H T E S EMP MDT
00906301
Design Package TO-3 TO-39 TO-220 LCC TO-263 SOT-223 TO-252 Load Current 1.5A 0.5A 1.5A 0.5A 1.5A 1A 0.5A
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 1F to 1000F of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients.
SOT-223 vs. D-Pak (TO-252) Packages
00906354
Scale 1:1
(c) 2003 National Semiconductor Corporation
DS009063
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LM117/LM317A/LM317
Connection Diagrams
(TO-3) Metal Can Package (TO-39) Metal Can Package
00906331
CASE IS OUTPUT
00906330
CASE IS OUTPUT
Bottom View NS Package Number H03A
Bottom View Steel Package NS Package Number K02A or K02C (TO-263) Surface-Mount Package (TO-220) Plastic Package
00906335
Top View
00906332
Front View NS Package Number T03B Ceramic Leadless Chip Carrier
00906336
Side View NS Package Number TS3B
00906334
Top View NS Package Number E20A
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LM117/LM317A/LM317
Connection Diagrams
(Continued) TO-252 (D-Pak)
4-Lead SOT-223
00906359
Front View NS Package Number MP04A
00906366
Front View NS Package Number TD03B
Ordering Information
Package Metal Can (TO-3) Metal Can (TO-39) Temperature Range -55C TJ +150C 0C TJ +125C -55C TJ +150C -55C TJ +150C -55C TJ +150C -40C TJ +125C 0C TJ +125C TO-220 3- Lead TO-263 3- Lead LCC SOT-223 4- Lead -40C TJ +125C 0C TJ +125C 0C TJ +125C -55C TJ +150C 0C TJ +125C -40C TJ +125C D- Pack 3- Lead 0C TJ +125C -40C TJ +125C Part Number LM117K STEEL LM317K STEEL LM117K/883 LM117H LM117H/883 LM317AH LM317H LM317AT LM317T LM317S LM317SX LM117E/883 LM317EMP LM317EMPX LM317AEMP LM317AEMPX LM317MDT LM317MDTX LM317AMDT LM317AMDTX LM317AMDT LM317MDT N07A LM117E/883 N01A Package Marking LM117K STEEL P+ LM317K STEEL P+ LM117K/883 LM117H P+ LM117H/883 LM317AH P+ LM317H P+ LM317AT P+ LM317T P+ LM317S P+ Transport Media 50 Per Bag 50 Per Bag 50 Per Bag 500 Per Box 20 Per Tray 500 Per Box 500 Per Box 45 Units/Rail 45 Units/Rail 45 Units/Rail 500 Units Tape and Reel 50 Units/Rail 1k Units Tape and Reel 2k Units Tape and Reel 1k Units Tape and Reel 2k Units Tape and Reel 75 Units/Rail 2.5k Units Tape and Reel 75 Units/Rail 2.5k Units Tape and Reel TD03B E20A MP04A TS3B T03B K02C H03A NSC Drawing K02A
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LM117/LM317A/LM317
Absolute Maximum Ratings
(Note 1)
ESD Tolerance (Note 5)
3 kV
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Input-Output Voltage Differential Storage Temperature Lead Temperature Metal Package (Soldering, 10 seconds) Plastic Package (Soldering, 4 seconds) 300C 260C Internally Limited +40V, -0.3V -65C to +150C
Operating Temperature Range
LM117 LM317A LM317 Preconditioning Thermal Limit Burn-In All Devices 100% -55C TJ +150C -40C TJ +125C 0C TJ +125C
Electrical Characteristics (Note 3) Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN - VOUT = 5V, and IOUT = 10 mA.
Parameter Reference Voltage 3V (VIN - VOUT) 40V, 10 mA IOUT IMAX, P PMAX Line Regulation Load Regulation Thermal Regulation Adjustment Pin Current Adjustment Pin Current Change Temperature Stability Minimum Load Current Current Limit 10 mA IOUT IMAX 3V (VIN - VOUT) 40V TMIN TJ TMAX (VIN - VOUT) = 40V (VIN - VOUT) 15V K Package H Package (VIN - VOUT) = 40V K Package H Package RMS Output Noise, % of VOUT Ripple Rejection Ratio 10 Hz f 10 kHz VOUT = 10V, f = 120 Hz, CADJ = 0 F VOUT = 10V, f = 120 Hz, CADJ = 10 F Long-Term Stability Thermal Resistance, Junction-to-Case Thermal Resistance, Junctionto-Ambient (No Heat Sink) TJ = 125C, 1000 hrs K Package H Package E Package K Package H Package E Package 35 140 0.3 2.3 12 1 3 15 % C/W C/W C/W C/W C/W C/W 66 80 dB 0.3 0.15 0.4 0.2 0.003 65 A A % dB 1.5 0.5 2.2 0.8 3.4 1.8 A A 1 3.5 5 % mA 3V (VIN - VOUT) 40V (Note 4) 10 mA IOUT IMAX (Note 4) 20 ms Pulse 0.01 0.02 0.1 0.3 0.03 50 0.2 0.02 0.05 0.3 1 0.07 100 5 %/V %/V % % %/W A A 1.20 1.25 1.30 Conditions Min LM117 (Note 2) Typ Max V V Units
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LM117/LM317A/LM317
Electrical Characteristics (Note 3)
Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN - VOUT = 5V, and IOUT = 10 mA. Parameter Reference Voltage 3V (VIN - VOUT) 40V, 10 mA IOUT IMAX, P PMAX Line Regulation Load Regulation Thermal Regulation Adjustment Pin Current Adjustment Pin Current Change Temperature Stability Minimum Load Current Current Limit 10 mA IOUT IMAX 3V (VIN - VOUT) 40V TMIN TJ TMAX (VIN - VOUT) = 40V (VIN - VOUT) 15V K, T, S Packages H Package MP Package (VIN - VOUT) = 40V K, T, S Packages H Package MP Package RMS Output Noise, % of VOUT Ripple Rejection Ratio 10 Hz f 10 kHz VOUT = 10V, f = 120 Hz, CADJ = 0 F VOUT = 10V, f = 120 Hz, CADJ = 10 F Long-Term Stability Thermal Resistance, Junction-to-Case TJ = 125C, 1000 hrs K Package MDT Package H Package T Package MP Package Thermal Resistance, Junction-to-Ambient (No Heat Sink) K Package MDT Package(Note 6) H Package T Package S Package (Note 6) 12 4 23.5 35 140 50 50 15 5 0.3 1 0.3 2.3 5 12 4 23.5 35 92 140 50 50 1 3 15 % C/W C/W C/W C/W C/W C/W C/W C/W C/W C/W 66 80 66 80 dB 0.15 0.075 0.55 0.4 0.2 0.4 0.003 65 0.15 0.075 0.15 0.4 0.2 0.4 0.003 65 A A A % dB 1.5 0.5 1.5 2.2 0.8 2.2 3.4 1.8 3.4 1.5 0.5 1.5 2.2 0.8 2.2 3.4 1.8 3.4 A A A 1 3.5 10 1 3.5 10 % mA 3V (VIN - VOUT) 40V (Note 4) 10 mA IOUT IMAX (Note 4) 20 ms Pulse 0.005 0.01 0.1 0.3 0.04 50 0.2 0.01 0.02 0.5 1 0.07 100 5 0.01 0.02 0.1 0.3 0.04 50 0.2 0.04 0.07 0.5 1.5 0.07 100 5 %/V %/V % % %/W A A Conditions Min 1.238 1.225 LM317A Typ 1.250 1.250 Max 1.262 1.270 1.20 1.25 1.30 Min LM317 Typ Max V V Units
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: Although power dissipation is internally limited, these specifications are applicable for maximum power dissipations of 2W for the TO-39 and SOT-223 and 20W for the TO-3, TO-220, and TO-263. IMAX is 1.5A for the TO-3, TO-220, and TO-263 packages, 0.5A for the TO-39 package and 1A for the SOT-223 Package. All limits (i.e., the numbers in the Min. and Max. columns) are guaranteed to National's AOQL (Average Outgoing Quality Level). 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 k resistor. Note 6: If the TO-263 or TO-252 packages are used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using 0.5 square inches of copper area. JA is 50C/W; with 1 square inch of copper area, JA is 37C/W; and with 1.6 or more square inches of copper area, JA is 32C/W. If the SOT-223 package is used, the thermal resistance can be reduced by increasing the PC board copper area (see applications hints for heatsinking).
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LM117/LM317A/LM317
Typical Performance Characteristics
Load Regulation
Output Capacitor = 0F unless otherwise noted Current Limit
00906337
00906338
Adjustment Current
Dropout Voltage
00906339
00906340
Temperature Stability
Minimum Operating Current
00906341
00906342
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LM117/LM317A/LM317
Typical Performance Characteristics Output Capacitor = 0F unless otherwise noted
Ripple Rejection Ripple Rejection
(Continued)
00906343
00906344
Ripple Rejection
Output Impedance
00906345
00906346
Line Transient Response
Load Transient Response
00906347
00906348
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LM117/LM317A/LM317
Application Hints
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
can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1F solid tantalum (or 25F aluminum electrolytic) on the output swamps this effect and insures stability. Any increase of the load capacitance larger than 10F 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 maximum performance. The current set resistor connected between the adjustment terminal and the output terminal (usually 240) 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 0.05 resistance between the regulator and load will have a load regulation due to line resistance of 0.05 x IL. If the set resistor is connected near the load the effective line resistance will be 0.05 (1 + R2/R1) or in this case, 11.5 times worse. Figure 2 shows the effect of resistance between the regulator and 240 set resistor.
00906305
FIGURE 1. Since the 100A 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. EXTERNAL CAPACITORS An input bypass capacitor is recommended. A 0.1F disc or 1F 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 10F bypass capacitor 80dB ripple rejection is obtainable at any output level. Increases over 10F 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 25F in aluminum electrolytic to equal 1F 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, 0.01F disc may seem to work better than a 0.1F disc as a bypass. Although the LM117 is stable with no output capacitors, like any feedback circuit, certain values of external capacitance
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00906306
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. 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 10F 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 25F 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
LM117/LM317A/LM317
Application Hints
(Continued)
when either the input or output is shorted. Internal to the LM117 is a 50 resistor which limits the peak discharge current. No protection is needed for output voltages of 25V or less and 10F capacitance. Figure 3 shows an LM117 with protection diodes included for use with outputs greater than 25V and high values of output capacitance.
00906355
FIGURE 4. (J-A) vs Copper (1 ounce) Area for the TO-263 Package
00906307
As shown in the figure, increasing the copper area beyond 1 square inch produces very little improvement. It should also be observed that the minimum value of (J-A) for the TO-263 package mounted to a PCB is 32C/W. As a design aid, Figure 5 shows the maximum allowable power dissipation compared to ambient temperature for the TO-263 device (assuming (J-A) is 35C/W and the maximum junction temperature is 125C).
D1 protects against C1 D2 protects against C2
FIGURE 3. Regulator with Protection Diodes When a value for (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. (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. HEATSINKING TO-263, SOT-223 AND TO-252 PACKAGE PARTS The TO-263 ("S"), SOT-223 ("MP") and TO-252 ("DT") 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. Figure 4 shows for the TO-263 the measured values of (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.
00906356
FIGURE 5. Maximum Power Dissipation vs TAMB for the TO-263 Package Figure 6 and Figure 7 show the information for the SOT-223 package. Figure 7 assumes a (J-A) of 74C/W for 1 ounce copper and 51C/W for 2 ounce copper and a maximum junction temperature of 125C.
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LM117/LM317A/LM317
Application Hints
(Continued)
mine if a heatsink is needed, the power dissipated by the regulator, PD, must be calculated: IIN = IL + IG PD = (VIN - VOUT) IL + VINIG Figure 8 shows the voltage and currents which are present in the circuit.
00906360 00906357
FIGURE 6. (J-A) vs Copper (2 ounce) Area for the SOT-223 Package
FIGURE 8. Power Dissipation Diagram The next parameter which must be calculated is the maximum allowable temperature rise, TR(max): TR(max) = TJ(max) - TA(max) where TJ(max) is the maximum allowable junction temperature (125C), 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 (JA) can be calculated: JA = TR(max)/PD If the maximum allowable value for JA is found to be 92C/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 JA falls below these limits, a heatsink is required. As a design aid, Table 1 shows the value of the JA of TO-252 for different heatsink area. The copper patterns that we used to measure these JAs are shown at the end of the Application Notes Section. Figure 9 reflects the same test results as what are in the 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 AN1028 for power enhancement techniques to be used with SOT-223 and TO-252 packages.
00906358
FIGURE 7. Maximum Power Dissipation vs TAMB for the SOT-223 Package The LM317 regulators have internal thermal shutdown to protect the device from over-heating. Under all possible operating conditions, the junction temperature of the LM317 must be within the range of 0C to 125C. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. To deter-
TABLE 1. JA Different Heatsink Area Layout Top Side (in2)* 1 2 3 4 5 6 7 8 9
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Copper Area Bottom Side (in2) 0 0 0 0 0 0 0.2 0.4 0.6
10
Thermal Resistance (JAC/W) TO-252 103 87 60 54 52 47 84 70 63
0.0123 0.066 0.3 0.53 0.76 1 0 0 0
LM117/LM317A/LM317
Application Hints
Layout 10 11 12 13 14 15 16
(Continued) TABLE 1. JA Different Heatsink Area (Continued) Copper Area 0 0 0.066 0.175 0.284 0.392 0.5 0.8 1 0.066 0.175 0.284 0.392 0.5 Thermal Resistance 57 57 89 72 61 55 53
Note: * Tab of device attached to topside of copper.
00906361
FIGURE 9. JA vs 2oz Copper Area for TO-252
00906363
FIGURE 10. Maximum Allowable Power Dissipation vs. Ambient Temperature for TO-252
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LM117/LM317A/LM317
Application Hints
(Continued)
00906362
FIGURE 11. Maximum Allowable Power Dissipation vs. 2oz Copper Area for TO-252
00906364
FIGURE 12. Top View of the Thermal Test Pattern in Actual Scale
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LM117/LM317A/LM317
Application Hints
(Continued)
00906365
FIGURE 13. Bottom View of the Thermal Test Pattern in Actual Scale
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LM117/LM317A/LM317
Schematic Diagram
00906308
Typical Applications
5V Logic Regulator with Electronic Shutdown*
Adjustable Regulator with Improved Ripple Rejection
00906310
Solid tantalum
00906303
*Discharges C1 if output is shorted to ground
*Min. output ) 1.2V
High Stability 10V Regulator Slow Turn-On 15V Regulator
00906309
00906311
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LM117/LM317A/LM317
Typical Applications
(Continued) High Current Adjustable Regulator
00906312
Optional -- improves ripple rejection
Solid tantalum
*Minimum load current = 30 mA
0 to 30V Regulator
Power Follower
00906313
Full output current not available at high input-output voltages
00906314
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LM117/LM317A/LM317
Typical Applications
(Continued) 5A Constant Voltage/Constant Current Regulator
00906315
Solid tantalum
*Lights in constant current mode
1A Current Regulator
High Gain Amplifier
00906316
1.2V-20V Regulator with Minimum Program Current
00906318
00906317
*Minimum load current ) 4 mA
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LM117/LM317A/LM317
Typical Applications
(Continued) Low Cost 3A Switching Regulator
00906319
Solid tantalum
*Core -- Arnold A-254168-2 60 turns
4A Switching Regulator with Overload Protection
00906320
Solid tantalum
*Core -- Arnold A-254168-2 60 turns
Precision Current Limiter
00906321
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LM117/LM317A/LM317
Typical Applications
(Continued) Tracking Preregulator
00906322
Current Limited Voltage Regulator
00906323
(Compared to LM117's higher current limit) -- At 50 mA output only 34 volt of drop occurs in R3 and R4
Adjusting Multiple On-Card Regulators with Single Control*
00906324
*All outputs within 100 mV
Minimum load -- 10 mA
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LM117/LM317A/LM317
Typical Applications
(Continued) AC Voltage Regulator
00906325
12V Battery Charger
00906326
Use of RS allows low charging rates with fully charged battery.
50mA Constant Current Battery Charger
00906327
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LM117/LM317A/LM317
Typical Applications
(Continued) Adjustable 4A Regulator
00906328
Current Limited 6V Charger
Digitally Selected Outputs
00906329
*Sets peak current (0.6A for 1)
**The 1000F is recommended to filter out input transients *Sets maximum VOUT
00906302
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LM117/LM317A/LM317
Physical Dimensions
unless otherwise noted
inches (millimeters)
TO-3 Metal Can Package (K) NS Package Number K02A
TO-3 Metal Can Package (K) Mil-Aero Product NS Package Number K02C
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LM117/LM317A/LM317
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
(TO-39) Metal Can Package NS Package Number H03A
3-Lead TO-220 NS Package Number T03B
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LM117/LM317A/LM317
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
3-Lead TO-263 NS Package Number TS3B
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LM117/LM317A/LM317
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Ceramic Leadless Chip Carrier NS Package Number E20A
4-Lead SOT-223 NS Package Number MP04A
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LM117/LM317A/LM317 3-Terminal Adjustable Regulator
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
3-Lead D-Pack NS Package Number TD03B
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