LM117 LM317A LM317
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LM117/LM317A/LM317 3-Terminal Adjustable Regulator
March 2010
LM117/LM317A/LM317 3-Terminal Adjustable Regulator
LM117 series adjustable 3-terminal positive voltage regulators capable supplying excess 1.5A over 1.2V output range. They exceptionally easy require only external resistors output voltage. Further, both line load regulation better than standard fixed regulators. Also, LM117 packaged standard transistor packages which easily mounted handled. addition higher performance than fixed regulators, LM117 series offers full overload protection available only IC's. Included chip current limit, thermal overload protection safe area protection. overload protection circuitry remains fully functional even adjustment terminal disconnected. Normally, capacitors needed unless device situated more than inches from input filter capacitors which case input bypass needed. optional output capacitor added improve transient response. adjustment terminal bypassed achieve very high ripple rejection ratios which difficult achieve with standard 3-terminal regulators. Besides replacing fixed regulators, LM117 useful wide variety other applications. Since regulator "floating" sees only input-to-output differential voltage, supplies several hundred volts regulated long maximum input output differential exceeded, i.e., avoid short-circuiting output. Also, makes especially simple adjustable switching regulator, programmable output regulator, connecting fixed resistor between adjustment output, LM117 used precision current regulator. Supplies with electronic shutdown achieved clamping adjustment terminal ground which programs output 1.2V where most loads draw little current. applications requiring greater output current, LM150 series (3A) LM138 series (5A) data sheets. negative complement, LM137 series data sheet.
Features
Guaranteed 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 1.2V Current limit constant with temperature Product Enhancement tested ripple rejection Output 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 Package TO-3 TO-220 TO-263 SOT-223 TO-39 TO-252 Output Current 1.5A 1.5A 1.5A 1.0A 0.5A 0.5A 0.5A
906301
SOT-223 TO-252 (D-Pak) Packages
Full output current available high input-output voltages *Needed device more than inches from filter capacitors. Optional-improves transient response. Output capacitors range 1000F aluminum tantalum electrolytic commonly used provide improved output impedance rejection transients.
906354
Scale
2010 National Semiconductor Corporation
9063
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LM117/LM317A/LM317
Connection Diagrams
TO-3 Metal Package TO-39 Metal Package
906331
CASE OUTPUT
906330
CASE OUTPUT
Bottom View Package Number H03A
Bottom View Steel Package Package Number K02A K02C TO-263 Surface-Mount Package TO-220 Plastic Package
906335
View
906332
Front View Package Number T03B TO-263 Surface-Mount Package Ceramic Leadless Chip Carrier
906336
Side View Package Number TS3B
906334
View Package Number E20A
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LM117/LM317A/LM317
4-Lead SOT-223 (EMP)
TO-252 (MDT)
906359
Front View Package Number MP04A
906366
Front View Package Number TD03B
Ordering Information
Package TO-3 Metal TO-220 Lead TO-263 Lead SOT-223 Lead Temperature Range -55°C +150°C +125°C -55°C +150°C -40°C +125°C +125°C +125°C +125°C -40°C +125°C -55°C +150°C TO-39 Metal TO-252 Lead D-Pack -55°C +150°C -40°C +125°C +125°C -55°C +150°C +125°C -40°C +125°C Output Current 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.0A 1.0A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A Order Number LM117K STEEL LM317K STEEL LM117K/883 LM317AT LM317T LM317S LM317SX LM317EMP LM317EMPX LM317AEMP LM317AEMPX LM117H LM117H/883 LM317AH LM317H LM117E/883 LM317MDT LM317MDTX LM317AMDT LM317AMDTX Package Marking LM117K STEEL LM317K STEEL LM117K/883 LM317AT LM317T LM317S N01A N07A LM117H LM117H/883 LM317AH LM317H LM117E/883 LM317MDT LM317AMDT Transport Media Units/Rail Units/Rail Units/Rail Units Tape Reel Units Tape Reel Units Tape Reel Units Tape Reel Units Tape Reel Tray Units/Rail Units/Rail 2.5k Units Tape Reel Units/Rail 2.5k Units Tape Reel TD03B E20A H03A MP04A Drawing K02A K02C T03B TS3B
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LM117/LM317A/LM317
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Power Dissipation Internally Limited Input-Output Voltage Differential +40V, -0.3V Storage Temperature -65°C +150°C Lead Temperature Metal Package (Soldering, seconds) 300°C Plastic Package (Soldering, seconds) 260°C Tolerance (Note
Operating Temperature Range
LM117 LM317A LM317 Preconditioning Thermal Limit Burn-In Devices 100% -55°C +150°C -40°C +125°C +125°C
LM117 Electrical Characteristics (Note Specifications with standard type face 25°C, those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VOUT IOUT
Parameter Reference Voltage Line Regulation Load Regulation Thermal Regulation Adjustment Current Adjustment Current Change Temperature Stability Minimum Load Current IOUT IMAX TMIN TMAX (VIN VOUT) (VIN VOUT) Current Limit Package Package (VIN VOUT) Package Package Output Noise, VOUT Ripple Rejection Ratio Long-Term Stability Thermal Resistance, Junction-to-Case Thermal Resistance, Junction-to-Ambient Heat Sink) VOUT 10V, CADJ VOUT 10V, CADJ 125°C, 1000 (TO-3) Package (TO-39) Package (LCC) Package (TO-3) Package (TO-39) Package (LCC) Package 0.15 0.20 0.003 °C/W (VIN VOUT) Conditions (VIN VOUT) 40V, IOUT IMAX (VIN VOUT) (Note IOUT IMAX (Note Pulse LM117 (Note 1.20 1.25 0.01 0.02 0.03 1.30 0.02 0.05 0.07 Units
°C/W
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LM117/LM317A/LM317
LM317A LM317 Electrical Characteristics (Note Specifications with standard type face 25°C, those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VOUT IOUT
Parameter Conditions LM317A 1.238 Reference Voltage (VIN VOUT) 40V, IOUT IMAX Line Regulation Load Regulation Thermal Regulation Adjustment Current Adjustment Current Change Temperature Stability Minimum Load Current IOUT IMAX TMIN TMAX (VIN VOUT) (VIN VOUT) Packages Package Packages (VIN VOUT) Packages Package Packages Output Noise, VOUT Ripple Rejection Ratio Long-Term Stability VOUT 10V, CADJ VOUT 10V, CADJ 125°C, 1000 (TO-3) Package (TO-220) Package (TO-263) Package (SOT-223) Package (TO-39) Package (TO-252) Package (TO-3) Package (TO-220) Package (TO-263) Package (Note (SOT-223) Package (Note (TO-39) Package (TO-252) Package (Note 0.112 0.075 0.30 0.20 0.003 23.5 0.15 0.112 0.075 0.40 0.30 0.20 0.003 23.5 (VIN VOUT) (VIN VOUT) (Note IOUT IMAX (Note Pulse 1.225 1.250 1.250 0.005 0.01 0.04 1.262 1.270 0.01 0.02 0.07 1.20 LM317 1.25 1.25 0.01 0.02 0.04 1.30 0.04 0.07 0.07 Units
Current Limit
Thermal Resistance, Junction-to-Case
°C/W
Thermal Resistance, Junction-to-Ambient Heat Sink)
°C/W
Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, guarantee specific performance limits. guaranteed specifications test conditions, Electrical Characteristics. guaranteed specifications apply only test conditions listed. Note Refer RETS117H drawing LM117H, RETS117K LM117K military specifications. Note IMAX 1.5A (TO-3), (TO-220), (TO-263) packages. IMAX 1.0A (SOT-223) package. IMAX 0.5A (TO-39), (TO-252), (LCC) packages. Device power dissipation (PD) limited ambient temperature (TA), device maximum junction temperature (TJ), package thermal resistance (JA). maximum allowable power dissipation temperature PD(MAX) ((TJ(MAX) TA)/JA). Min. Max. limits guaranteed National's Average Outgoing Quality Level (AOQL). Note Regulation measured constant junction temperature, using pulse testing with duty cycle. Changes output voltage heating effects covered under specifications thermal regulation. Note Human body model, discharged through resistor. Note When surface mount packages used (TO-263, SOT-223, TO-252), junction ambient thermal resistance reduced increasing board copper area that thermally connected package. Applications Hints section heatsink techniques.
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LM117/LM317A/LM317
Typical Performance Characteristics
Load Regulation
Output Capacitor unless otherwise noted Current Limit
906337
906338
Adjustment Current
Dropout Voltage
906339
906340
VOUT VIN, VOUT VREF
VOUT VIN, VOUT
906367
906368
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LM117/LM317A/LM317
Temperature Stability
Minimum Operating Current
906341
906342
Ripple Rejection
Ripple Rejection
906343
906344
Ripple Rejection
Output Impedance
906345
906346
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LM117/LM317A/LM317
Line Transient Response
Load Transient Response
906347
906348
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LM117/LM317A/LM317
Application Hints
operation, LM117 develops nominal 1.25V reference voltage, VREF, between output adjustment terminal. reference voltage impressed across program resistor and, since voltage constant, constant current then flows through output resistor giving output voltage
aluminum electrolytic) output swamps this effect insures stability. increase load capacitance larger than will merely improve loop stability output impedance. LOAD REGULATION LM117 capable providing extremely good load regulation precautions needed obtain maximum performance. current resistor connected between adjustment terminal output terminal (usually 240) should tied directly output (case) regulator rather than near load. This eliminates line drops from appearing effectively series with reference degrading regulation. example, regulator with 0.05 resistance between regulator load will have load regulation line resistance 0.05 resistor connected near load effective line resistance will 0.05 R2/R1) this case, 11.5 times worse. Figure shows effect resistance between regulator resistor.
906305
FIGURE Since 100A current from adjustment terminal represents error term, LM117 designed minimize IADJ make very constant with line load changes. this, quiescent operating current returned output establishing minimum load current requirement. there insufficient load output, output will rise. EXTERNAL CAPACITORS input bypass capacitor recommended. 0.1F disc solid tantalum input suitable input bypassing almost applications. device more sensitive absence input bypassing when adjustment output capacitors used above values will eliminate possibility problems. adjustment terminal bypassed ground LM117 improve ripple rejection. This bypass capacitor prevents ripple from being amplified output voltage increased. With bypass capacitor 80dB ripple rejection obtainable output level. Increases over appreciably improve ripple rejection frequencies above 120Hz. bypass capacitor used, sometimes necessary include protection diodes prevent capacitor from discharging through internal current paths damaging device. general, best type capacitors solid tantalum. Solid tantalum capacitors have impedance even high frequencies. Depending upon capacitor construction, takes about aluminum electrolytic equal solid tantalum high frequencies. Ceramic capacitors also good high frequencies; some types have large decrease capacitance frequencies around MHz. this reason, 0.01 disc seem work better than disc bypass. Although LM117 stable with output capacitors, like feedback circuit, certain values external capacitance cause excessive ringing. This occurs with values between 5000 solid tantalum
906306
FIGURE Regulator with Line Resistance Output Lead With TO-3 package, easy minimize resistance from case resistor, using separate leads case. However, with TO-39 package, care should taken minimize wire length output lead. ground returned near ground load provide remote ground sensing improve load regulation. PROTECTION DIODES When external capacitors used with regulator sometimes necessary protection diodes prevent capacitors from discharging through current points into regulator. Most capacitors have enough internal series resistance deliver spikes when shorted. Although surge short, there enough energy damage parts When output capacitor connected regulator input shorted, output capacitor will discharge into output regulator. discharge current depends value capacitor, output voltage regulator, rate decrease VIN. LM117, this discharge path through large junction that able sustain surge with problem. This true other types positive regulators. output capacitors less, there need diodes. bypass capacitor adjustment terminal discharge through current junction. Discharge occurs when either input, output, shorted. Internal LM117 resistor which limits peak discharge current. protection needed output voltages less capacitance. Figure shows LM117 with protection
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LM117/LM317A/LM317
diodes included with outputs greater than high values output capacitance.
906360
FIGURE Power Dissipation Diagram calculated maximum allowable thermal resistance higher than actual package rating, then additional work needed. calculated maximum allowable thermal resistance lower than actual package rating either power dissipation (PD) needs reduced, maximum ambient temperature TA(MAX) needs reduced, thermal resistance (JA) must lowered adding heatsink, some combination these. heatsink needed, value calculated from formula: JC))
906307
protects against protects against
FIGURE Regulator with Protection Diodes HEATSINK REQUIREMENTS LM317 regulators have internal thermal shutdown protect device from over-heating. Under operating conditions, junction temperature LM317 should exceed rated maximum junction temperature (TJ) 150° LM117, 125°C LM317A LM317. heatsink required depending maximum device power dissipation maximum ambient temperature application. determine heatsink needed, power dissipated regulator, must calculated: ((VIN VOUT) (VIN
Figure shows voltage currents which present circuit. next parameter which must calculated maximum allowable temperature rise, TR(MAX): TR(MAX) TJ(MAX) TA(MAX)
where thermal resistance contact area between device case heatsink surface, thermal resistance from junction surface package case. When value (H-A) found using equation shown, heatsink must selected that value that less than, equal this number. (H-A) rating specified numerically heatsink manufacturer catalog, shown curve that plots temperature rise power dissipation heatsink. HEATSINKING SURFACE MOUNT PACKAGES TO-263 (S), SOT-223 (EMP) TO-252 (MDT) packages copper plane itself heatsink. optimize heat sinking ability plane PCB, solder package plane. HEATSINKING SOT-223 PACKAGE Figure Figure show information SOT-223 package. Figure assumes (J-A) 74°C/W ounce copper 51°C/W ounce copper maximum junction temperature 125°C. Please AN-1028 thermal enhancement techniques used with SOT-223 TO-252 packages.
where TJ(MAX) maximum allowable junction temperature (150°C LM117, 125°C LM317A/LM317), TA(MAX) maximum ambient temperature which will encountered application. Using calculated values TR(MAX) maximum allowable value junction-to-ambient thermal resistance (JA) calculated: (TR(MAX)
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LM117/LM317A/LM317
906357
906355
FIGURE (J-A) Copper ounce) Area SOT-223 Package
FIGURE (J-A) Copper ounce) Area TO-263 Package design aid, Figure shows maximum allowable power dissipation compared ambient temperature TO-263 device (assuming (J-A) 35°C/W maximum junction temperature 125°C).
906358
FIGURE Maximum Power Dissipation TAMB SOT-223 Package HEATSINKING TO-263 PACKAGE Figure shows TO-263 measured values different copper area sizes using typical with ounce copper solder mask over copper area used heatsinking. shown Figure increasing copper area beyond square inch produces very little improvement. should also observed that minimum value (J-A) TO-263 package mounted 32°C/W.
906356
FIGURE Maximum Power Dissipation TAMB TO-263 Package HEATSINKING TO-252 PACKAGE maximum allowable value found 103° (Typical Rated Value) TO-252 package, heatsink needed since package alone will dissipate enough heat satisfy these requirements. calculated value falls below these limits, heatsink required. design aid, Table shows value TO-252 different heatsink area. copper patterns that used measure these shown Application Notes Section. Figure reflects same test results what Table Figure shows maximum allowable power dissipation ambient temperature TO-252 device. Figure shows maximum allowable power dissipation copper area (in2) TO-252 device. Please AN-1028 thermal enhancement techniques used with SOT-223 TO-252 packages.
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LM117/LM317A/LM317
TABLE Different Heatsink Area Layout Side (in2)* 0.0123 0.066 0.53 0.76 0.066 0.066 0.066 0.066 0.066 0.066 0.175 0.284 0.392 Copper Area Bottom Side 0.066 0.175 0.284 0.392 (in2) Thermal Resistance (JA°C/W) TO-252
Note: device attached topside copper.
906361
FIGURE Copper Area TO-252
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LM117/LM317A/LM317
906363
FIGURE Maximum Allowable Power Dissipation Ambient Temperature TO-252
906362
FIGURE Maximum Allowable Power Dissipation Copper Area TO-252
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LM117/LM317A/LM317
906364
FIGURE View Thermal Test Pattern Actual Scale
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LM117/LM317A/LM317
906365
FIGURE Bottom View Thermal Test Pattern Actual Scale
Schematic Diagram
906308
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LM117/LM317A/LM317
Typical Applications
Logic Regulator with Electronic Shutdown*
Solid tantalum *Discharges output shorted ground
High Stability Regulator
*Min. output 1.2V
906303
Slow Turn-On Regulator
906311
906309
Adjustable Regulator with Improved Ripple Rejection
906310
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LM117/LM317A/LM317
High Current Adjustable Regulator
906312
Optional-improves ripple rejection Solid tantalum *Minimum load current
Regulator
Power Follower
906313
Full output current available high input-output voltages
906314
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LM117/LM317A/LM317
Constant Voltage/Constant Current Regulator
906315
Solid tantalum *Lights constant current mode
Current Regulator
*Minimum load current
High Gain Amplifier
906316
1.2V-20V Regulator with Minimum Program Current
906318
906317
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LM117/LM317A/LM317
Cost Switching Regulator
906319
Solid tantalum *Core-Arnold A-254168-2 turns
Switching Regulator with Overload Protection
906320
Solid tantalum *Core-Arnold A-254168-2 turns
Precision Current Limiter
906321
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LM117/LM317A/LM317
Tracking Preregulator
906322
Current Limited Voltage Regulator
906323
(Compared LM117's higher current limit) output only volt drop occurs
Adjusting Multiple On-Card Regulators with Single Control*
906324
*All outputs within ±100 Minimum load-10
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LM117/LM317A/LM317
Voltage Regulator
906325
Battery Charger
906326
allows charging rates with fully charged battery.
50mA Constant Current Battery Charger
906327
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LM117/LM317A/LM317
Adjustable Regulator
906328
Current Limited Charger
Digitally Selected Outputs
906329
*Sets peak current (0.6A **The 1000F recommended filter input transients
906302
*Sets maximum VOUT
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LM117/LM317A/LM317
Physical Dimensions inches (millimeters) unless otherwise noted
TO-3 Metal Package Package Number K02A
TO-3 Metal Package Mil-Aero Product Package Number K02C
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LM117/LM317A/LM317
TO-39 Metal Package Package Number H03A
3-Lead TO-220 Package Number T03B
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LM117/LM317A/LM317
3-Lead TO-263 Package Number TS3B
Ceramic Leadless Chip Carrier Package Number E20A
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LM117/LM317A/LM317
4-Lead SOT-223 (EMP) Package Number MP04A
3-Lead D-Pack (MDT) Package Number TD03B
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LM117/LM317A/LM317
Notes
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LM117/LM317A/LM317 3-Terminal Adjustable Regulator
Notes
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