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LM117 and LM317-N 3-Terminal Adjustable Regulator (Rev. P)

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  • ( )OUT ADJR

    V = 1.25 V I RR

    2

    21

    1

    + +

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    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015

    LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator1 Features 3 Description

    The LM117 and LM317-N series of adjustable 3-pin1 Typ. 0.1% Load Regulation

    positive voltage regulators are capable of supplying in Typ. 0.01%/V Line Regulation excess of 1.5 A over a 1.25-V to 37-V output range 1.5-A Output Current and a wide temperature range. They are

    exceptionally easy to use and require only two Adjustable Output Down to 1.25 Vexternal resistors to set the output voltage. Further, Current Limit Constant With Temperature both line and load regulation are better than standard

    80-dB Ripple Rejection fixed regulators. Short-Circuit Protected Output The LM117 and LM317-N offer full overload 55C to 150C Operating Temperature Range protection such as current limit, thermal overload

    (LM117) protection and safe area protection. All overloadprotection circuitry remains fully functional even if theadjustment terminal is disconnected.2 Applications

    Automotive LED Lighting Typically, no capacitors are needed unless the deviceis situated more than 6 inches from the input filter Battery Chargerscapacitors, in which case an input bypass is needed. Post Regulation for Switching Supplies An optional output capacitor can be added to improve

    Constant Current Regulators transient response. The adjustment terminal can bebypassed to achieve very high ripple rejection ratios Microprocessor Suppliesthat are difficult to achieve with standard 3-terminalregulators.Typical ApplicationBecause the regulator is floating and detects only theinput-to-output differential voltage, supplies of severalhundred volts can be regulated as long as themaximum input-to-output differential is not exceeded.That is, avoid short-circuiting the output.

    By connecting a fixed resistor between theadjustment pin and output, the LM117 and LM317-Ncan be also used as a precision current regulator.Supplies with electronic shutdown can be achievedby clamping the adjustment terminal to ground, whichprograms the output to 1.25 V where most loads drawlittle current.

    For applications requiring greater output current, seedata sheets for LM150 series (3 A), SNVS772, andLM138 series (5 A), SNVS771. For the negativecomplement, see LM137 (SNVS778) series data*Needed if device is more than 6 inches from filtersheet.capacitors.

    Optionalimproves transient response Device Information(1)PART NUMBER PACKAGE BODY SIZE (NOM)

    TO-3 (2) 38.94 mm x 25.40 mmLM117

    TO (3) 8.255 mm 8.255 mmTO-3 (2) 38.94 mm x 25.40 mmTO-220 (3) 14.986 mm 10.16 mmTO-263 (3) 10.18 mm 8.41 mm

    LM317-NSOT-223 (4) 6.50 mm 3.50 mmTO (3) 8.255 mm 8.255 mmTO-252 (3) 6.58 mm 6.10 mm

    (1) For all available packages, see the orderable addendum atthe end of the data sheet.

    1

    An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,intellectual property matters and other important disclaimers. PRODUCTION DATA.

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.com/lit/pdf/SNVS772http://www.ti.com/lit/pdf/SNVS771http://www.ti.com/lit/pdf/SNVS778

  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Table of Contents8.3 Feature Description................................................. 131 Features .................................................................. 18.4 Device Functional Modes........................................ 132 Applications ........................................................... 1

    9 Application and Implementation ........................ 153 Description ............................................................. 19.1 Application Information............................................ 154 Revision History..................................................... 29.2 Typical Applications ................................................ 155 Device Comparison Table ..................................... 3

    10 Power Supply Recommendations ..................... 276 Pin Configuration and Functions ......................... 311 Layout................................................................... 277 Specifications......................................................... 5

    11.1 Layout Guidelines ................................................. 277.1 Absolute Maximum Ratings ...................................... 511.2 Layout Example .................................................... 277.2 ESD Ratings.............................................................. 511.3 Thermal Considerations ........................................ 287.3 Recommended Operating Conditions....................... 5

    12 Device and Documentation Support ................. 357.4 Thermal Information, LM117..................................... 512.1 Documentation Support ........................................ 357.5 Thermal Information, LM317-N ................................. 612.2 Related Links ........................................................ 357.6 LM117 Electrical Characteristics............................... 612.3 Community Resources.......................................... 357.7 LM317-N Electrical Characteristics........................... 712.4 Trademarks ........................................................... 357.8 Typical Characteristics .............................................. 812.5 Electrostatic Discharge Caution............................ 358 Detailed Description ............................................ 1112.6 Glossary ................................................................ 358.1 Overview ................................................................. 11

    13 Mechanical, Packaging, and Orderable8.2 Functional Block Diagram ....................................... 12Information ........................................................... 35

    4 Revision HistoryNOTE: Page numbers for previous revisions may differ from page numbers in the current version.

    Changes from Revision O (January 2014) to Revision P Page

    Added, updated, or renamed the following sections: Description; Pin Configuration and Functions; Specifications;ESD Ratings table; Application and Implementation; Power Supply Recommendations; Layout; Mechanical,Packaging, and Ordering Information .................................................................................................................................... 1

    Removed information regarding LM317A, formerly part of this data sheet. LM317A can now be found in the TIcatalog under literature number SNVSAC2 ........................................................................................................................... 1

    Changes from Revision N (August 2013) to Revision O Page

    Deleted MDT Package (over Full Operating Temperature Range) ....................................................................................... 7 Changed Current Limit MIN from 0.112 to 0.15 and TYP from 0.3 to 0.4 for (VIN VOUT) = 40 V in the LM317A

    and LM317-N Electrical Characteristics Section .................................................................................................................... 7 Deleted MDT Package ........................................................................................................................................................... 7

    2 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    5 Device Comparison Table

    Table 1. LM317 Family OptionsPART NUMBER TEMPERATURE DESCRIPTION PRODUCT FOLDER

    LM317-N 0C to 125C 40-V, 1.5-A Catalog device Click hereLM317A 40C to 125C 40-V, 1.5-A Industrial device Click here

    LM317HV 0C to 125C 60-V, 1.5-A Catalog device Click hereLM317L-N 40C to 125C 40-V, 0.1-A, Industrial device Click here

    LM117 55C to 150C 40-V, 1.5-A Extended-temperature device Click hereLM117HV 55C to 150C 60-V, 1.5-A Extended-temperature device Click here

    LM117HVQML 55C to 125C 60-V, 1.5-A Military-grade device per spec MIL-PRF-38535 Click hereLM117HVQML-SP 55C to 125C 60-V, 1.5-A Space-grade device Click here

    LM117JAN 55C to 125C 40-V, 1.5-A Military-grade device per spec MIL-PRF-38510 Click hereLM117QML 55C to 125C 40-V, 1.5-A Military-grade device per spec MIL-PRF-38535 Click here

    LM117QML-SP 55C to 125C 40-V, 1.5-A Space-grade device Click here

    6 Pin Configuration and Functions

    NDS Metal Can PackageNDT Metal Can Package2-Pin TO-3

    3-Pin TOBottom ViewBottom View

    Case is OutputCase is Output

    Pin Functions, Metal Can PackagesPIN

    I/O DESCRIPTIONNAME TO-3 TOADJ 1 2 Adjust pinVOUT CASE 3, CASE O Output voltage pin for the regulatorVIN 2 1 I Input voltage pin for the regulator

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 3

    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    KTT Surface-Mount Package DCY Surface-Mount Package3-Pin DDPAK/TO-263 4-Pin SOT-223

    Top View Top View

    NDP Surface-Mount PackageNDE Plastic Package 3-Pin TO-252

    3-Pin TO-220 Front ViewFront View

    Pin FunctionsPIN

    I/O DESCRIPTIONNAME TO-263 TO-220 SOT-223 TO-252ADJ 1 1 1 1 Adjust pinVOUT 2, TAB 2, TAB 2, 4 2, TAB O Output voltage pin for the regulatorVIN 3 3 3 3 I Input voltage pin for the regulator

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    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    7 Specifications

    7.1 Absolute Maximum Ratingsover operating free-air temperature range (unless otherwise noted) (1) (2)

    MIN MAX UNITPower dissipation Internally LimitedInput-output voltage differential 0.3 40 V

    Metal package (soldering, 10 seconds) 300 CLead temperature

    Plastic package (soldering, 4 seconds) 260 CStorage temperature, Tstg 65 150 C

    (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratingsonly, which do not imply functional operation of the device at these or any other conditions beyond those indicated under RecommendedOperating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

    (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability andspecifications.

    7.2 ESD RatingsVALUE UNIT

    ElectrostaticV(ESD) Human-body model (HBM) (1) 3000 Vdischarge

    (1) Manufacturing with less than 500-V HBM is possible with the necessary precautions. Pins listed as 3000 V may actually have higherperformance.

    7.3 Recommended Operating Conditionsover operating free-air temperature range (unless otherwise noted)

    MIN MAX UNITOperating temperature (LM117) 55 150 COperating temperature (LM317-N) 0 125 C

    7.4 Thermal Information, LM117LM117

    NDS NDTTHERMAL METRIC (1) UNIT(TO-3) (TO)2 PINS 3 PINS

    RJA Junction-to-ambient thermal resistance (2) 39 186 C/WRJC(top) Junction-to-case (top) thermal resistance 2 21 C/W

    (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics applicationreport, SPRA953.

    (2) No heatsink.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 5

    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    7.5 Thermal Information, LM317-NLM317-N

    KTT NDE DCY NDT NDPTHERMAL METRIC (1) (2) UNIT(TO-263) (TO-220) (SOT-223) (TO) (TO-252)3 PINS 3 PINS 4 PINS 3 PINS 3 PINS

    RJA Junction-to-ambient thermal resistance 41.0 23.3 59.6 186 (3) 54 C/WRJC(top) Junction-to-case (top) thermal resistance 43.6 16.2 39.3 21 51.3 C/WRJB Junction-to-board thermal resistance 23.6 4.9 8.4 28.6 C/WJT Junction-to-top characterization parameter 10.4 2.7 1.8 3.9 C/WJB Junction-to-board characterization parameter 22.6 4.9 8.3 28.1 C/WRJC(bot) Junction-to-case (bottom) thermal resistance 0.9 1.1 0.9 C/W

    (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics applicationreport, SPRA953.

    (2) When surface mount packages are used (SOT-223, TO-252), the junction to ambient thermal resistance can be reduced by increasingthe PCB copper area that is thermally connected to the package. See Heatsink Requirements for heatsink techniques.

    (3) No heatsink

    7.6 LM117 Electrical CharacteristicsSome specifications apply over full Operating Temperature Range as noted. Unless otherwise specified, TJ = 25C, VIN VOUT = 5 V, and IOUT = 10 mA. (1) (2)

    PARAMETER TEST CONDITIONS MIN TYP MAX UNIT3 V (VIN VOUT) 40 V,Reference voltage 1.2 1.25 1.3 V10 mA IOUT IMAX(1) (over full operating temperature range)

    TJ = 25C 0.01 0.02Line regulation 3 V (VIN VOUT) 40 V (3) %/Vover full operating 0.02 0.05temperature range

    TJ = 25C 0.1% 0.3%Load regulation 10 mA IOUT IMAX(1) (3) over full operating 0.3% 1%temperature rangeThermal regulation 20-ms pulse 0.03 0.07 %/WAdjustment pin current over full operating temperature range 50 100 A

    10 mA IOUT IMAX(1)Adjustment pin current change 0.2 5 A3 V (VIN VOUT) 40 V (over full operating temperature range)Temperature stability TMIN TJ TMAX (over full operating temperature range) 1%Minimum load current (VIN VOUT) = 40 V (over full operating temperature range) 3.5 5 mA

    TO-3 Package (over full 1.5 2.2 3.4operating temperature range)(VIN VOUT) 15 V ATO-39 Package (over full 0.5 0.8 1.8Current limit operating temperature range)

    TO-3 package 0.3 0.4(VIN VOUT) = 40 V ATO-39 package 0.15 0.2

    RMS output noise, % of VOUT 10 Hz f 10 kHz 0.003%VOUT = 10 V, f = 120 Hz, CADJ = 0 F (over full operating 65 dBtemperature range)

    Ripple rejection ratioVOUT = 10 V, f = 120 Hz, CADJ = 10 F (over full operating 66 80 dBtemperature range)

    Long-term stability TJ = 125C, 1000 hrs 0.3% 1%

    (1) IMAX = 1.5 A for the NDS (TO-3), NDE (TO-220), and KTT (TO-263) packages. IMAX = 1.0 A for the DCY (SOT-223) package.IMAX = 0.5 A for the NDT (TO) and NDP (TO-252) packages. Device power dissipation (PD) is limited by ambient temperature (TA),device maximum junction temperature (TJ), and package thermal resistance (JA). The maximum allowable power dissipation at anytemperature is : PD(MAX) = ((TJ(MAX) TA) / JA). All Min. and Max. limits are ensured to TI's Average Outgoing Quality Level (AOQL).

    (2) Specifications and availability for military and space grades of LM117/883 can be found in the LM117QML data sheet (SNVS356).Specifications and availability for military and space grades of LM117 can be found in the LM117JAN data sheet (SNVS365).

    (3) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due toheating effects are covered under the specifications for thermal regulation.

    6 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.ti.com/lit/pdf/spra953http://www.ti.com/lit/pdf/SNVS356http://www.ti.com/lit/pdf/SNVS365http://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    7.7 LM317-N Electrical Characteristics (1)Some specifications apply over full Operating Temperature Range as noted. Unless otherwise specified, TJ = 25C, VIN VOUT = 5 V, and IOUT = 10 mA.

    PARAMETER TEST CONDITIONS MIN TYP MAX UNITTJ = 25C 1.25 V3 V (VIN VOUT) 40 V,Reference voltage10 mA IOUT IMAX(1) (over Full Operating Temperature 1.2 1.25 1.3 VRange)

    TJ = 25C 0.01 0.04Line regulation 3V (VIN VOUT) 40 V (2) %/V(over full operating 0.02 0.07temperature range)

    TJ = 25C 0.1% 0.5%Load regulation 10 mA IOUT IMAX(1) (2) (over full operating 0.3% 1.5%temperature range)Thermal regulation 20-ms pulse 0.04 0.07 %/WAdjustment pin current (over full operating temperature range) 50 100 A

    10 mA IOUT IMAX(1) (over full operatingAdjustment pin current change 0.2 5 A3V (VIN VOUT) 40V temperature range)(over full operatingTemperature stability TMIN TJ TMAX 1%temperature range)(over full operatingMinimum load current (VIN VOUT) = 40 V 3.5 10 mAtemperature range)TO-3, TO-263 Packages(over full operating 1.5 2.2 3.4temperature range)SOT-223, TO-220Packages (over full(VIN VOUT) 15 V 1.5 2.2 3.4 Aoperating temperaturerange)

    Current limitTO, TO-252 Package (overfull operating temperature 0.5 0.8 1.8range)TO-3, TO-263 packages 0.15 0.4

    (VIN VOUT) = 40 V SOT-223, TO-220 packages 0.15 0.4 ATO, TO-252 package 0.075 0.2

    RMS output noise, % of VOUT 10 Hz f 10 kHz 0.003%VOUT = 10 V, f = 120 Hz, CADJ = 0 F (over full operating 65 dBtemperature range)

    Ripple rejection ratioVOUT = 10V, f = 120 Hz, CADJ = 10 F (over full operating 66 80 dBtemperature range)

    Long-term stability TJ = 125C, 1000 hrs 0.3% 1%

    (1) IMAX = 1.5 A for the NDS (TO-3), NDE (TO-220), and KTT (TO-263) packages. IMAX = 1.0 A for the DCY (SOT-223) package.IMAX = 0.5 A for the NDT (TO) and NDP (TO-252) packages. Device power dissipation (PD) is limited by ambient temperature (TA),device maximum junction temperature (TJ), and package thermal resistance (JA). The maximum allowable power dissipation at anytemperature is : PD(MAX) = ((TJ(MAX) TA) / JA). All Min. and Max. limits are ensured to TI's Average Outgoing Quality Level (AOQL).

    (2) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due toheating effects are covered under the specifications for thermal regulation.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 7

    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    7.8 Typical CharacteristicsOutput Capacitor = 0 F, unless otherwise noted.

    Figure 1. Load Regulation Figure 2. Current Limit

    Figure 4. Dropout VoltageFigure 3. Adjustment Current

    Figure 5. VOUT vs VIN, VOUT = VREF Figure 6. VOUT vs VIN, VOUT = 5 V

    8 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Typical Characteristics (continued)Output Capacitor = 0 F, unless otherwise noted.

    Figure 7. Temperature Stability Figure 8. Minimum Operating Current

    Figure 9. Ripple Rejection Figure 10. Ripple Rejection

    Figure 12. Output ImpedanceFigure 11. Ripple Rejection

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    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Characteristics (continued)Output Capacitor = 0 F, unless otherwise noted.

    Figure 13. Line Transient Response Figure 14. Load Transient Response

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  • LM317-N

    ( )OUT ADJR

    V = 1.25 V I RR

    2

    21

    1

    + +

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    8 Detailed Description

    8.1 OverviewIn operation, the LM317-N develops a nominal 1.25-V reference voltage, VREF, between the output andadjustment terminal. The reference voltage is impressed across program resistor R1 and, because the voltage isconstant, a constant current I1 then flows through the output set resistor R2, giving an output voltage calculatedby Equation 1:

    (1)

    Figure 15. Setting the VOUT Voltage

    Because the 100-A current from the adjustment terminal represents an error term, the LM317-N was designedto minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating currentis returned to the output establishing a minimum load current requirement. If there is insufficient load on theoutput, the output will rise.

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    Product Folder Links: LM117 LM317-N

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    8.2 Functional Block Diagram

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  • LM317-N

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    8.3 Feature Description

    8.3.1 Load RegulationThe LM317-N is capable of providing extremely good load regulation but a few precautions are needed to obtainmaximum performance. The current set resistor, R1, must be connected near the output terminal of the regulatorrather than near the load. If R1 is placed too far from the output terminal, then the increased trace resistance, RS,will cause an error voltage drop in the adjustment loop and degrade load regulation performance. Therefore, R1must be placed as close as possible to the output terminal to minimize RS and maximize load regulationperformance.

    Figure 16 shows the effect of the trace resistance, RS, when R1 is placed far from the output terminal of theregulator. It is clear that RS will cause an error voltage drop especially during higher current loads, so it isimportant to minimize the RS trace resistance by keeping R1 close to the regulator output terminal.

    Figure 16. 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 twoseparate leads to the case. However, with the TO package, care must be taken to minimize the wire length of theoutput lead. The ground of R2 can be returned near the ground of the load to provide remote ground sensingand improve load regulation.

    8.4 Device Functional Modes

    8.4.1 External CapacitorsAn input bypass capacitor is recommended. A 0.1-F disc or 1-F solid tantalum on the input is suitable inputbypassing for almost all applications. The device is more sensitive to the absence of input bypassing whenadjustment 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 LM317-N to improve ripple rejection. This bypasscapacitor prevents ripple from being amplified as the output voltage is increased. With a 10-F bypass capacitor,80-dB ripple rejection is obtainable at any output level. Increases over 10 F do not appreciably improve theripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary toinclude protection diodes to prevent the capacitor from discharging through internal low current paths anddamaging the device.

    In general, the best type of capacitors to use is solid tantalum. Solid tantalum capacitors have low impedanceeven at high frequencies. Depending upon capacitor construction, it takes about 25 F in aluminum electrolytic toequal 1-F solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies. However,some types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, 0.01-F discmay seem to work better than a 0.1-F disc as a bypass.

    Although the LM317-N is stable with no output capacitors, like any feedback circuit, certain values of externalcapacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1-F solidtantalum (or 25-F aluminum electrolytic) on the output swamps this effect and insures stability. Any increase ofthe load capacitance larger than 10 F will merely improve the loop stability and output impedance.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 13

    Product Folder Links: LM117 LM317-N

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  • ( )OUT ADJR

    V = 1.25 V I RR

    2

    21

    1

    + +

    LM317-N

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Device Functional Modes (continued)8.4.2 Protection DiodesWhen external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes toprevent the capacitors from discharging through low current points into the regulator. Most 10-F capacitors havelow enough internal series resistance to deliver 20-A spikes when shorted. Although the surge is short, there isenough 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 dischargeinto the output of the regulator. The discharge current depends on the value of the capacitor, the output voltageof the regulator, and the rate of decrease of VIN. In the LM317-N, this discharge path is through a large junctionthat is able to sustain 15-A surge with no problem. This is not true of other types of positive regulators. Foroutput capacitors of 25 F or less, there is no need to use diodes.

    The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurswhen either the input, or the output, is shorted. Internal to the LM317-N is a 50- resistor which limits the peakdischarge current. No protection is needed for output voltages of 25 V or less and 10-F capacitance. Figure 17shows an LM317-N with protection diodes included for use with outputs greater than 25 V and high values ofoutput capacitance.

    D1 protects against C1D2 protects against C2

    Figure 17. Regulator With Protection Diodes

    14 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

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  • LM317-N

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    9 Application and Implementation

    NOTEInformation in the following applications sections is not part of the TI componentspecification, and TI does not warrant its accuracy or completeness. TIs customers areresponsible for determining suitability of components for their purposes. Customers mustvalidate and test their design implementation to confirm system functionality.

    9.1 Application InformationThe LM117 and LM317-N are versatile, high performance, linear regulators with high accuracy and a widetemperature range. An output capacitor can be added to further improve transient response, and the ADJ pin canbe bypassed to achieve very high ripple-rejection ratios. Its functionality can be utilized in many differentapplications that require high performance regulation, such as battery chargers, constant current regulators, andmicroprocessor supplies.

    9.2 Typical Applications

    9.2.1 1.25-V to 25-V Adjustable RegulatorThe LM117 can be used as a simple, low-dropout regulator to enable a variety of output voltages needed fordemanding applications. By using an adjustable R2 resistor, a variety of output voltages can be made possibleas shown in Figure 18.

    NOTE: Full output current not available at high input-output voltages*Needed if device is more than 6 inches from filter capacitors.Optionalimproves transient response. Output capacitors in the range of 1 F to 1000 F of aluminum or tantalumelectrolytic are commonly used to provide improved output impedance and rejection of transients.

    Figure 18. 1.25-V to 25-V Adjustable Regulator

    9.2.1.1 Design RequirementsThe device component count is very minimal, employing two resistors as part of a voltage divider circuit and anoutput capacitor for load regulation. An input capacitor is needed if the device is more than 6 inches from filtercapacitors. An optional bypass capacitor across R2 can also be used to improve PSRR.

    9.2.1.2 Detailed Design ProcedureThe output voltage is set based on the selection of the two resistors, R1 and R2, as shown in Figure 18. Fordetails on capacitor selection, refer to External Capacitors.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 15

    Product Folder Links: LM117 LM317-N

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  • LM317-N

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Applications (continued)9.2.1.3 Application CurveAs shown in Figure 19, VOUT will rise with VIN minus some dropout voltage. This dropout voltage during startupwill vary with ROUT.

    Figure 19. VOUT vs VIN, VOUT = 5V

    9.2.2 5-V Logic Regulator With Electronic ShutdownFigure 20 shows a variation of the 5-V output regulator application uses the L117 along with an NPN transistor toprovide shutdown control. The NPN will either block or sink the current from the ADJ pin by responding to theTTL pin logic. When TTL is pulled high, the NPN is on and pulls the ADJ pin to GND, and the LM117 outputsabout1.25 V. When TTL is pulled low, the NPN is off and the regulator outputs according to the programmedadjustable voltage.

    NOTE: Min. output 1.2 V

    Figure 20. 5-V Logic Regulator With Electronic Shutdown

    16 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

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  • LM117

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Typical Applications (continued)9.2.3 Slow Turnon 15-V RegulatorAn application of LM117 includes a PNP transistor with a capacitor to implement slow turnon functionality (seeFigure 21). As VIN rises, the PNP sinks current from the ADJ rail. The output voltage at start up is the addition ofthe 1.25-V reference plus the drop across the base to emitter. While this is happening, the capacitor begins tocharge and eventually opens the PNP. At this point, the device functions normally, regulating the output at 15 V.A diode is placed between C1 and VOUT to provide a path for the capacitor to discharge. Such controlled turnonis useful for limiting the in-rush current.

    Figure 21. Slow Turnon 15-V Regulator

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 17

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  • R3267

    1%

    R21.5 k

    1%

    R12 k5%

    C10.1 F

    LM329

    VIN15 V

    VOUT10 V

    VIN VOUT

    LM117

    ADJ

    LM317-N

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Applications (continued)9.2.4 Adjustable Regulator With Improved Ripple RejectionTo improve ripple rejection, a capacitor is used to bypass the ADJ pin to GND (see Figure 22). This is used tosmooth output ripple by cleaning the feedback path and stopping unnecessary noise from being fed back into thedevice, propagating the noise.

    NOTE: Solid tantalum*Discharges C1 if output is shorted to ground

    Figure 22. Adjustable Regulator With Improved Ripple Rejection

    9.2.5 High Stability 10-V RegulatorUsing a high stability shunt voltage reference in the feedback path, such as the LM329, provides dampingnecessary for a stable, low noise output (see Figure 23).

    Figure 23. High Stability 10-V Regulator

    18 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

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  • three LM195 devices in parallel

    LM117

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Typical Applications (continued)9.2.6 High-Current Adjustable RegulatorUsing the LM195 power transistor in parallel with the LM117 can increase the maximum possible output loadcurrent (see Figure 24). Sense resistor R1 provides the 0.6 V across base to emitter to turn on the PNP. This onswitch allows current to flow, and the voltage drop across R3 drives three LM195 power transistors designed tocarry an excess of 1 A each.

    NOTEThe selection of R1 determines a minimum load current for the PNP to turn on. The higherthe resistor value, the lower the load current must be before the transistors turn on.

    NOTE: Optionalimproves ripple rejectionSolid tantalum*Minimum load current = 30 mA

    Figure 24. High-Current Adjustable Regulator

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 19

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  • LM117

    LM117

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Applications (continued)9.2.7 Emitter-Follower Current AmplifierThe LM117 is used as a constant current source in the emitter follower circuit (see Figure 25). The LM195 powertransistor is being used as a current gain amplifier, boosting the INPUT current. The LM117 provides a stablecurrent bias than just using a resistor.

    Figure 25. Emitter-Follower Current Amplifier

    9.2.8 1-A Current RegulatorA simple, fixed current regulator can be made by placing a resistor between the VOUT and ADJ pins of the LM117(see Figure 26). By regulating a constant 1.25 V between these two terminals, a constant current is delivered tothe load.

    Figure 26. 1-A Current Regulator

    20 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

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  • LM117

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Typical Applications (continued)9.2.9 Common-Emitter AmplifierSometimes it is necessary to use a power transistor for high current gain. In this case, the LM117 providesconstant current at the collector of the LM195 in this common emitter application (see Figure 27). The 1.25-Vreference between VOUT and ADJ is maintained across the 2.4- resistor, providing about 500-mA constant biascurrent into the collector of the LM195.

    Figure 27. Common-Emitter Amplifier

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 21

    Product Folder Links: LM117 LM317-N

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  • LM317-N

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Applications (continued)9.2.10 Low-Cost 3-A Switching RegulatorThe LM317-N can be used in a switching buck regulator application in cost sensitive applications that requirehigh efficiency. The switch node above D1 oscillates between ground and VIN, as the voltage across senseresistor R1 drives the power transistor on and off. Figure 28 exhibits self-oscillating behavior by negativefeedback through R6 and C3 to the ADJ pin of the LM317-N.

    NOTE: Solid tantalum*CoreArnold A-254168-2 60 turns

    Figure 28. Low-Cost 3-A Switching Regulator

    22 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

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  • LM117

    mVShort circuit current is approximately , or 210 mA

    R

    600

    3-

    LM317-N

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Typical Applications (continued)9.2.11 Current-Limited Voltage RegulatorA maximum limit on output current can be set using the circuit shown in Figure 29. The load current travelsthrough R3 and R4. As the load current increases, the voltage drop across R3 increases until the NPN transistoris driven, during which the ADJ pin is pulled down to ground and the output voltage is pulled down to thereference voltage of 1.25 V.

    (Compared to LM117's higher current limit)At 50 mA output only volt of drop occurs in R3 and R4

    Figure 29. Current-Limited Voltage Regulator

    9.2.12 Adjusting Multiple On-Card Regulators With Single ControlFigure 30 shows how multiple LM117 regulators can be controlled by setting one resistor. Because each devicemaintains the reference voltage of about 1.25 V between its VOUT and ADJ pins, we can connect each ADJ rail toa single resistor, setting the same output voltage across all devices. This allows for independent outputs, eachresponding to its corresponding input only. Designers must also consider that by the nature of the circuit,changes to R1 and R2 will affect all regulators.

    NOTE: *All outputs within 100 mVMinimum load10 mA

    Figure 30. Adjusting Multiple On-Card Regulators With Single Control

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 23

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  • LM317-N

    LM317-N

    LM317-N

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Applications (continued)9.2.13 AC Voltage RegulatorIn Figure 31, the top regulator is +6 V above the bottom regulator. It is clear that when the input rises above +6 Vplus the dropout voltage, only the top LM317-N regulates +6 V at the output. When the input falls below 6 Vminus the dropout voltage, only the bottom LM317-N regulates 6 V at the output. For regions where the outputis not clipped, there is no regulation taking place, so the output follows the input.

    Figure 31. AC Voltage Regulator

    9.2.14 12-V Battery ChargerThe LM317-N can be used in a battery charger application shown in Figure 32, where the device maintains eitherconstant voltage or constant current mode depending on the current charge of the battery. To do this, the partsenses the voltage drop across the battery and delivers the maximum charging current necessary to charge thebattery. When the battery charge is low, there exists a voltage drop across the sense resistor RS, providingconstant current to the battery at that instant. As the battery approaches full charge, the potential drop across RSapproaches zero, reducing the current and maintaining the fixed voltage of the battery.

    Use of RS allows low charging rates with fully charged battery.

    Figure 32. 12-V Battery Charger

    24 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

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  • LM317-N

    LM317-N

    LM317-N

    LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Typical Applications (continued)9.2.15 Adjustable 4-A RegulatorUsing three LM317-N devices in parallel increases load current capability (Figure 33). Output voltage is set bythe variable resistor tied to the non-inverting terminal of the operational amplifier, and reference current to thetransistor is developed across the 100 resistor. When output voltage rises, the operational amplifier corrects bydrawing current from the base, closing the transistor. This effectively pulls ADJ down and lowers the outputvoltage through negative feedback.

    Figure 33. Adjustable 4-A Regulator

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 25

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  • LM317-N

    LM317-N

    LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Typical Applications (continued)9.2.16 Current-Limited 6-V ChargerThe current in a battery charger application is limited by switching between constant current and constant voltagestates (see Figure 34). When the battery pulls low current, the drop across the 1 resistor is not substantial andthe NPN remains off. A constant voltage is seen across the battery, as regulated by the resistor divider. Whencurrent through the battery rises past peak current, the 1 provides enough voltage to turn the transistor on,pulling ADJ close to ground. This results in limiting the maximum current to the battery.

    *Sets peak current (0.6A for 1)**The 1000-F is recommended to filter out input transients

    Figure 34. Current-Limited 6-V Charger

    9.2.17 Digitally Selected OutputsFigure 35 demonstrates a digitally selectable output voltage. In its default state, all transistors are off and theoutput voltage is set based on R1 and R2. By driving certain transistors, the associated resistor is connected inparallel to R2, modifying the output voltage of the regulator.

    *Sets maximum VOUT

    Figure 35. Digitally Selected Outputs

    (2)

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  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    10 Power Supply RecommendationsThe input supply to the LM117 and LM317-N must be kept at a voltage level such that its maximum input tooutput differential voltage is not exceeded. The minimum dropout voltage must also be met with extra headroomwhen possible to keep the LM117 and LM317-N in regulation. An input capacitor is recommended, especiallywhen the input pin is located more than 6 inches away from the power supply source. For more informationregarding capacitor selection, refer to External Capacitors.

    11 Layout

    11.1 Layout GuidelinesSome layout guidelines must be followed to ensure proper regulation of the output voltage with minimum noise.Traces carrying the load current must be wide to reduce the amount of parasitic trace inductance and thefeedback loop from VOUT to ADJ must be kept as short as possible. To improve PSRR, a bypass capacitor canbe placed at the ADJ pin and must be located as close as possible to the IC. In cases when VIN shorts to ground,an external diode must be placed from VOUT to VIN to divert the surge current from the output capacitor andprotect the IC. Similarly, in cases when a large bypass capacitor is placed at the ADJ pin and VOUT shorts toground, an external diode must be placed from ADJ to VOUT to provide a path for the bypass capacitor todischarge. These diodes must be placed close to the corresponding IC pins to increase their effectiveness.

    11.2 Layout Example

    Figure 36. Layout Example (SOT-223)

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 27

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Layout Example (continued)

    Figure 37. Layout Example (TO-220)

    11.3 Thermal Considerations

    11.3.1 Heatsink RequirementsThe LM317-N regulators have internal thermal shutdown to protect the device from over-heating. Under alloperating conditions, the junction temperature of the LM317-N must not exceed the rated maximum junctiontemperature (TJ) of 150C for the LM117, or 125C for the LM317-N. A heatsink may be required depending onthe maximum device power dissipation and the maximum ambient temperature of the application. To determine ifa heatsink is needed, the power dissipated by the regulator, PD, must be calculate with Equation 3:

    PD = ((VIN VOUT) IL) + (VIN IG) (3)

    Figure 38 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) in Equation 4:TR(MAX) = TJ(MAX) TA(MAX) (4)

    where TJ(MAX) is the maximum allowable junction temperature (150C for the LM117, or 125C for the LM317-N),and TA(MAX) is the maximum ambient temperature that will be encountered in the application.

    Using the calculated values for TR(MAX) and PD, the maximum allowable value for the junction-to-ambient thermalresistance (JA) can be calculated with Equation 5:

    JA = (TR(MAX) / PD) (5)

    28 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

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  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Thermal Considerations (continued)

    Figure 38. Power Dissipation Diagram

    If the calculated maximum allowable thermal resistance is higher than the actual package rating, then noadditional work is needed. If the calculated maximum allowable thermal resistance is lower than the actualpackage rating either the power dissipation (PD) needs to be reduced, the maximum ambient temperature TA(MAX)needs to be reduced, the thermal resistance (JA) must be lowered by adding a heatsink, or some combination ofthese.

    If a heatsink is needed, the value can be calculated from Equation 6:HA (JA (CH + JC))

    where CH is the thermal resistance of the contact area between the device case and the heatsink surface JC is thermal resistance from the junction of the die to surface of the package case (6)

    When a value for HA is found using the equation shown, a heatsink must be selected that has a value that isless than, or equal to, this number.

    The HA rating is specified numerically by the heatsink manufacturer in the catalog, or shown in a curve that plotstemperature rise vs power dissipation for the heatsink.

    11.3.2 Heatsinking Surface Mount PackagesThe TO-263 (KTT), SOT-223 (DCY) and TO-252 (NDP) packages use a copper plane on the PCB and the PCBitself as a heatsink. To optimize the heat sinking ability of the plane and PCB, solder the tab of the package tothe plane.

    11.3.2.1 Heatsinking the SOT-223 (DCY) PackageFigure 39 and Figure 40 show the information for the SOT-223 package. Figure 40 assumes a JA of 74C/W for1-oz. copper and 59.6C/W for 2-oz. copper and a maximum junction temperature of 125C. See AN-1028(SNVA036) for thermal enhancement techniques to be used with SOT-223 and TO-252 packages.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 29

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  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Thermal Considerations (continued)

    Figure 40. Maximum Power Dissipation vs TAMB for theFigure 39. JA vs Copper (2-oz.) Area for the SOT-223SOT-223 PackagePackage

    11.3.2.2 Heatsinking the TO-263 (KTT) PackageFigure 41 shows for the TO-263 the measured values of JA for different copper area sizes using a typical PCBwith 1-oz. copper and no solder mask over the copper area used for heatsinking.

    As shown in Figure 41, increasing the copper area beyond 1 square inch produces very little improvement. Itmust also be observed that the minimum value of JA for the TO-263 package mounted to a PCB is 32C/W.

    Figure 41. JA vs Copper (1-oz.) Area for the TO-263 Package

    As a design aid, Figure 42 shows the maximum allowable power dissipation compared to ambient temperaturefor the TO-263 device (assuming JA is 35C/W and the maximum junction temperature is 125C).

    30 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Thermal Considerations (continued)

    Figure 42. Maximum Power Dissipation vs TAMB for the TO-263 Package

    11.3.2.3 Heatsinking the TO-252 (NDP) PackageIf the maximum allowable value for JA is found to be 54C/W (typical rated value) for the TO-252 package, noheatsink is needed because the package alone will dissipate enough heat to satisfy these requirements. If thecalculated value for JA falls below these limits, a heatsink is required.

    As a design aid, Table 2 shows the value of the JA of NDP the package for different heatsink area. The copperpatterns that we used to measure these JAs are shown in Figure 47. Figure 43 reflects the same test results aswhat are in Table 2.

    Figure 44 shows the maximum allowable power dissipation versus ambient temperature for the TO-252 device.Figure 45 shows the maximum allowable power dissipation versus copper area (in2) for the TO-252 device. SeeAN-1028 (SNVA036) for thermal enhancement techniques to be used with SOT-223 and TO-252 packages.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 31

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.ti.com/lit/pdf/SNVA036http://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Thermal Considerations (continued)Table 2. JA Different Heatsink Area

    LAYOUT COPPER AREA THERMAL RESISTANCETop Side (in2) (1) Bottom Side (in2) (JAC/W) TO-252

    1 0.0123 0 1032 0.066 0 873 0.3 0 604 0.53 0 545 0.76 0 526 1.0 0 477 0.066 0.2 848 0.066 0.4 709 0.066 0.6 63

    10 0.066 0.8 5711 0.066 1.0 5712 0.066 0.066 8913 0.175 0.175 7214 0.284 0.284 6115 0.392 0.392 5516 0.5 0.5 53

    (1) Tab of device attached to topside of copper.

    Figure 43. JA vs 2-oz. Copper Area for TO-252 Figure 44. Maximum Allowable Power Dissipation vsAmbient Temperature for TO-252

    32 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    Figure 45. Maximum Allowable Power Dissipation vs 2-oz. Copper Area for TO-252

    Figure 46. Top View of the Thermal Test Pattern in Actual Scale

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 33

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • LM117, LM317-NSNVS774P MAY 2004REVISED OCTOBER 2015 www.ti.com

    Figure 47. Bottom View of the Thermal Test Pattern in Actual Scale

    34 Submit Documentation Feedback Copyright 20042015, Texas Instruments Incorporated

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • LM117, LM317-Nwww.ti.com SNVS774P MAY 2004REVISED OCTOBER 2015

    12 Device and Documentation Support

    12.1 Documentation Support

    12.1.1 Related Documentation For applications requiring greater output current, see LM150 series (3A) (SNVS772) and LM138 series (5A)

    (SNVS771) data sheets. For the negative complement, see LM137 (SNVS778) series data sheet. For specifications and availability for military and space grades of LM117/883, see the LM117QML data sheet

    (SNVS356). Specifications and availability for military and space grades of LM117JAN can be found in the LM117 data

    sheet (SNVS365). For thermal enhancement techniques to be used with SOT-223 and TO-252 packages, see AN-1028,

    Maximum Power Enhancement Techniques for Power Packages (SNVA036).

    12.2 Related LinksThe table below lists quick access links. Categories include technical documents, support and communityresources, tools and software, and quick access to sample or buy.

    Table 3. Related LinksTECHNICAL TOOLS & SUPPORT &PARTS PRODUCT FOLDER SAMPLE & BUY DOCUMENTS SOFTWARE COMMUNITY

    LM117 Click here Click here Click here Click here Click hereLM317-N Click here Click here Click here Click here Click here

    12.3 Community ResourcesThe following links connect to TI community resources. Linked contents are provided "AS IS" by the respectivecontributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms ofUse.

    TI E2E Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaborationamong engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and helpsolve problems with fellow engineers.

    Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools andcontact information for technical support.

    12.4 TrademarksE2E is a trademark of Texas Instruments.All other trademarks are the property of their respective owners.

    12.5 Electrostatic Discharge CautionThese devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foamduring storage or handling to prevent electrostatic damage to the MOS gates.

    12.6 GlossarySLYZ022 TI Glossary.

    This glossary lists and explains terms, acronyms, and definitions.

    13 Mechanical, Packaging, and Orderable InformationThe following pages include mechanical, packaging, and orderable information. This information is the mostcurrent data available for the designated devices. This data is subject to change without notice and revision ofthis document. For browser-based versions of this data sheet, refer to the left-hand navigation.

    Copyright 20042015, Texas Instruments Incorporated Submit Documentation Feedback 35

    Product Folder Links: LM117 LM317-N

    http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-nhttp://www.ti.comhttp://www.ti.com/lit/pdf/SNVS772http://www.ti.com/lit/pdf/SNVS771http://www.ti.com/lit/pdf/SNVS778http://www.ti.com/lit/pdf/SNVS356http://www.ti.com/lit/pdf/SNVS365http://www.ti.com/lit/pdf/SNVA036http://www.ti.com/product/LM117?dcmp=dsproject&hqs=pfhttp://www.ti.com/product/LM117?dcmp=dsproject&hqs=sandbuysamplebuyhttp://www.ti.com/product/LM117?dcmp=dsproject&hqs=tddoctype2http://www.ti.com/product/LM117?dcmp=dsproject&hqs=swdesKithttp://www.ti.com/product/LM117?dcmp=dsproject&hqs=supportcommunityhttp://www.ti.com/product/LM317-N?dcmp=dsproject&hqs=pfhttp://www.ti.com/product/LM317-N?dcmp=dsproject&hqs=sandbuysamplebuyhttp://www.ti.com/product/LM317-N?dcmp=dsproject&hqs=tddoctype2http://www.ti.com/product/LM317-N?dcmp=dsproject&hqs=swdesKithttp://www.ti.com/product/LM317-N?dcmp=dsproject&hqs=supportcommunityhttp://www.ti.com/corp/docs/legal/termsofuse.shtmlhttp://www.ti.com/corp/docs/legal/termsofuse.shtmlhttp://e2e.ti.comhttp://support.ti.com/http://www.ti.com/lit/pdf/SLYZ022http://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SNVS774P&partnum=LM117http://www.ti.com/product/lm117?qgpn=lm117http://www.ti.com/product/lm317-n?qgpn=lm317-n

  • PACKAGE OPTION ADDENDUM

    www.ti.com 30-Sep-2015

    Addendum-Page 1

    PACKAGING INFORMATION

    Orderable Device Status(1)

    Package Type PackageDrawing

    Pins PackageQty

    Eco Plan(2)

    Lead/Ball Finish(6)

    MSL Peak Temp(3)

    Op Temp (C) Device Marking(4/5)

    Samples

    LM117H ACTIVE TO NDT 3 500 Green (RoHS& no Sb/Br)

    Call TI Level-1-NA-UNLIM -55 to 150 ( LM117HP+ ~ LM117HP+)

    LM117H/NOPB ACTIVE TO NDT 3 500 Green (RoHS& no Sb/Br)

    Call TI Level-1-NA-UNLIM -55 to 150 ( LM117HP+ ~ LM117HP+)

    LM117K STEEL ACTIVE TO-3 NDS 2 50 TBD Call TI Call TI -55 to 150 LM117KSTEELP+

    LM117K STEEL/NOPB ACTIVE TO-3 NDS 2 50 Green (RoHS& no Sb/Br)

    Call TI Level-1-NA-UNLIM -55 to 150 LM117KSTEELP+

    LM317EMP NRND SOT-223 DCY 4 1000 TBD Call TI Call TI 0 to 125 N01A

    LM317EMP/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS& no Sb/Br)

    CU SN Level-1-260C-UNLIM 0 to 125 N01A

    LM317EMPX/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS& no Sb/Br)

    CU SN Level-1-260C-UNLIM 0 to 125 N01A

    LM317H ACTIVE TO NDT 3 500 Green (RoHS& no Sb/Br)

    Call TI Level-1-NA-UNLIM 0 to 125 ( LM317HP+ ~ LM317HP+)

    LM317H/NOPB ACTIVE TO NDT 3 500 Green (RoHS& no Sb/Br)

    Call TI Level-1-NA-UNLIM 0 to 125 ( LM317HP+ ~ LM317HP+)

    LM317K STEEL ACTIVE TO-3 NDS 2 50 TBD Call TI Call TI 0 to 125 LM317KSTEELP+

    LM317K STEEL/NOPB ACTIVE TO-3 NDS 2 50 Green (RoHS& no Sb/Br)

    Call TI Level-1-NA-UNLIM 0 to 125 LM317KSTEELP+

    LM317MDT/NOPB ACTIVE TO-252 NDP 3 75 Green (RoHS& no Sb/Br)

    CU SN Level-2-260C-1 YEAR 0 to 125 LM317MDT

    LM317MDTX/NOPB ACTIVE TO-252 NDP 3 2500 Green (RoHS& no Sb/Br)

    CU SN Level-2-260C-1 YEAR 0 to 125 LM317MDT

    LM317S/NOPB ACTIVE DDPAK/TO-263

    KTT 3 45 Pb-Free (RoHSExempt)

    CU SN Level-3-245C-168 HR 0 to 125 LM317SP+

    LM317SX/NOPB ACTIVE DDPAK/TO-263

    KTT 3 500 Pb-Free (RoHSExempt)

    CU SN Level-3-245C-168 HR 0 to 125 LM317SP+

    LM317T NRND TO-220 NDE 3 45 TBD Call TI Call TI LM317T P+

    LM317T/LF01 ACTIVE TO-220 NDG 3 45 Pb-Free (RoHSExempt)

    CU SN Level-4-260C-72 HR LM317T P+

    LM317T/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS& no Sb/Br)

    CU SN Level-1-NA-UNLIM 0 to 125 LM317T P+

    http://www.ti.com/product/LM117?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM117?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM117?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM117?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuyhttp://www.ti.com/product/LM317-N?CMP=conv-poasamples#samplebuy

  • PACKAGE OPTION ADDENDUM

    www.ti.com 30-Sep-2015

    Addendum-Page 2

    (1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.

    (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availabilityinformation and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement thatlead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used betweenthe die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weightin homogeneous material)

    (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

    (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

    (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that device.

    (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finishvalue exceeds the maximum column width.

    Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on informationprovided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken andcontinues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

    In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

    http://www.ti.com/productcontent

  • TAPE AND REEL INFORMATION

    *All dimensions are nominal

    Device PackageType

    PackageDrawing

    Pins SPQ ReelDiameter

    (mm)

    ReelWidth

    W1 (mm)

    A0(mm)

    B0(mm)

    K0(mm)

    P1(mm)

    W(mm)

    Pin1Quadrant

    LM317EMP SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3

    LM317EMP/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3

    LM317EMPX/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3

    LM317MDTX/NOPB TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2

    LM317SX/NOPB DDPAK/TO-263

    KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

    PACKAGE MATERIALS INFORMATION

    www.ti.com 30-Sep-2015

    Pack Materials-Page 1

  • *All dimensions are nominal

    Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

    LM317EMP SOT-223 DCY 4 1000 367.0 367.0 35.0

    LM317EMP/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0

    LM317EMPX/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0

    LM317MDTX/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0

    LM317SX/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

    PACKAGE MATERIALS INFORMATION

    www.ti.com 30-Sep-2015

    Pack Materials-Page 2

  • MECHANICAL DATA

    NDT0003A

    www.ti.com

    H03A (Rev D)

  • MECHANICAL DATA

    NDS0002A

    www.ti.com

  • MECHANICAL DATA

    NDE0003B

    www.ti.com

  • MECHANICAL DATA

    NDG0003F

    www.ti.com

    T03F (Rev B)

  • MECHANICAL DATA

    NDP0003B

    www.ti.com

    TD03B (Rev F)

  • MECHANICAL DATA

    MPDS094A APRIL 2001 REVISED JUNE 2002

    POST OFFICE BOX 655303 DALLAS, TEXAS 75265

    DCY (R-PDSO-G4) PLASTIC SMALL-OUTLINE

    4202506/B 06/2002

    6,30 (0.248)6,70 (0.264)

    2,90 (0.114)3,10 (0.122)

    6,70 (0.264)7,30 (0.287) 3,70 (0.146)

    3,30 (0.130)

    0,02 (0.0008)0,10 (0.0040)

    1,50 (0.059)1,70 (0.067)

    0,23 (0.009)0,35 (0.014)

    1 2 3

    4

    0,66 (0.026)0,84 (0.033)

    1,80 (0.071) MAX

    Seating Plane

    010

    Gauge Plane

    0,75 (0.030) MIN

    0,25 (0.010)

    0,08 (0.003)

    0,10 (0.004) M

    2,30 (0.091)

    4,60 (0.181) M0,10 (0.004)

    NOTES: A. All linear dimensions are in millimeters (inches).B. This drawing is subject to change without notice.C. Body dimensions do not include mold flash or protrusion.D. Falls within JEDEC TO-261 Variation AA.

  • MECHANICAL DATA

    KTT0003B

    www.ti.com

    BOTTOM SIDE OF PACKAGETS3B (Rev F)

  • IMPORTANT NOTICE

    Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and otherchanges to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latestissue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current andcomplete. All semiconductor products (also referred to herein as components) are sold subject to TIs terms and conditions of salesupplied at the time of order acknowledgment.TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TIs termsand conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessaryto support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarilyperformed.TI assumes no liability for applications assistance or the design of Buyers products. Buyers are responsible for their products andapplications using TI components. To minimize the risks associated with Buyers products and applications, Buyers should provideadequate design and operating safeguards.TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, orother intellectual property right relating to any combination, machine, or process in which TI components or services are used. Informationpublished by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty orendorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of thethird party, or a license from TI under the patents or other intellectual property of TI.Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alterationand is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altereddocumentation. Information of third parties may be subject to additional restrictions.Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or servicevoids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.TI is not responsible or liable for any such statements.Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirementsconcerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or supportthat may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards whichanticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might causeharm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the useof any TI components in safety-critical applications.In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TIs goal is tohelp enable customers to design and create their own end-product solutions that meet applicable functional safety standards andrequirements. Nonetheless, such components are subject to these terms.No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the partieshave executed a special agreement specifically governing such use.Only those TI components which TI has specifically designated as military grade or enhanced plastic are designed and intended for use inmilitary/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI componentswhich have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal andregulatory requirements in connection with such use.TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use ofnon-designated products, TI will not be responsible for any failure to meet ISO/TS16949.

    Products ApplicationsAudio www.ti.com/audio Automotive and Transportation www.ti.com/automotiveAmplifiers amplifier.ti.com Communications and Telecom www.ti.com/communicationsData Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computersDLP Products www.dlp.com Consumer Electronics www.ti.com/consumer-appsDSP dsp.ti.com Energy and Lighting www.ti.com/energyClocks and Timers www.ti.com/clocks Industrial www.ti.com/industrialInterface interface.ti.com Medical www.ti.com/medicalLogic logic.ti.com Security www.ti.com/securityPower Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defenseMicrocontrollers microcontroller.ti.com Video and Imaging www.ti.com/videoRFID www.ti-rfid.comOMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.comWireless Connectivity www.ti.com/wirelessconnectivity

    Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright 2015, Texas Instruments Incorporated

    http://www.ti.com/audiohttp://www.ti.com/automotivehttp://amplifier.ti.comhttp://www.ti.com/communicationshttp://dataconverter.ti.comhttp://www.ti.com/computershttp://www.dlp.comhttp://www.ti.com/consumer-appshttp://dsp.ti.comhttp://www.ti.com/energyhttp://www.ti.com/clockshttp://www.ti.com/industrialhttp://interface.ti.comhttp://www.ti.com/medicalhttp://logic.ti.comhttp://www.ti.com/securityhttp://power.ti.comhttp://www.ti.com/space-avionics-defensehttp://microcontroller.ti.comhttp://www.ti.com/videohttp://www.ti-rfid.comhttp://www.ti.com/omaphttp://e2e.ti.comhttp://www.ti.com/wirelessconnectivity

    1Features2Applications3DescriptionTable of Contents4Revision History5Device Comparison Table6Pin Configuration and Functions7Specifications7.1Absolute Maximum Ratings7.2ESD Ratings7.3Recommended Operating Conditions7.4Thermal Information, LM1177.5Thermal Information, LM317-N7.6LM117 Electrical Characteristics7.7LM317-N Electrical Characteristics7.8Typical Characteristics

    8Detailed Description8.1Overview8.2Functional Block Diagram8.3Feature Description8.3.1Load Regulation

    8.4Device Functional Modes8.4.1External Capacitors8.4.2Protection Diodes

    9Application and Implementation9.1Application Information9.2Typical Applications9.2.11.25-V to 25-V Adjustable Regulator9.2.1.1Design Requirements9.2.1.2Detailed Design Procedure9.2.1.3Application Curve

    9.2.25-V Logic Regulator With Electronic Shutdown9.2.3Slow Turnon 15-V Regulator9.2.4Adjustable Regulator With Improved Ripple Rejection9.2.5High Stability 10-V Regulator9.2.6High-Current Adjustable Regulator9.2.7Emitter-Follower Current Amplifier9.2.81-A Current Regulator9.2.9Common-Emitter Amplifier9.2.10Low-Cost 3-A Switching Regulator9.2.11Current-Limited Voltage Regulator9.2.12Adjusting Multiple On-Card Regulators With Single Control9.2.13AC Voltage Regulator9.2.1412-V Battery Charger9.2.15Adjustable 4-A Regulator9.2.16Current-Limited 6-V Charger9.2.17Digitally Selected Outputs

    10Power Supply Recommendations11Layout11.1Layout Guidelines11.2Layout Example11.3Thermal Considerations11.3.1Heatsink Requirements11.3.2Heatsinking Surface Mount Packages11.3.2.1Heatsinking the SOT-223 (DCY) Package11.3.2.2Heatsinking the TO-263 (KTT) Package11.3.2.3Heatsinking the TO-252 (NDP) Package

    12Device and Documentation Support12.1Documentation Support12.1.1Related Documentation

    12.2Related Links12.3Community Resources12.4Trademarks12.5Electrostatic Discharge Caution12.6Glossary

    13Mechanical, Packaging, and Orderable InformationPage 1Page 1