LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 LM138/LM338 5-Amp Adjustable Regulators Check for Samples: LM138, LM338 FEATURES 1 * * * * * * * 2 Specified 7A Peak Output Current Specified 5A Output Current Adjustable Output Down to 1.2V Specified Thermal Regulation Current Limit Constant with Temperature P+ Product Enhancement Tested Output is Short-Circuit Protected APPLICATIONS * * * Adjustable Power Supplies Constant Current Regulators Battery Chargers DESCRIPTION The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5A over a 1.2V to 32V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage. Careful circuit design has resulted in outstanding load and line regulation--comparable to many commercial power supplies. The LM138 family is supplied in a standard 3-lead transistor package. A unique feature of the LM138 family is timedependent current limiting. The current limit circuitry allows peak currents of up to 12A to be drawn from the regulator for short periods of time. This allows the LM138 to be used with heavy transient loads and speeds start-up under full-load conditions. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Also included on the chip are thermal overload protection and safe area protection for the power transistor. Overload protection remains functional even if the adjustment pin is accidentally disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypassing the adjustment pin will increase the regulator's ripple rejection. Besides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. Since the regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., do not short-circuit output to ground. The part numbers in the LM138 series which have a K suffix are packaged in a standard Steel TO-3 package, while those with a T suffix are packaged in a TO-220 plastic package. The LM138 is rated for -55C TJ +150C, and the LM338 is rated for 0C TJ +125C. Connection Diagram Connection Diagrams Figure 1. (TO-3) Metal Can Package Bottom View See Package Number NDS0002A Figure 2. (TO-220) Plastic Package Front View See Package Number NDE0003B 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 1998-2013, Texas Instruments Incorporated LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) (3) Power Dissipation Internally limited +40V, -0.3V Input/Output Voltage Differential -65C to +150C Storage Temperature Lead Temperature TO-3 Package (Soldering, 10 seconds) TO-220 Package (Soldering, 4 seconds) 300C 260C ESD Tolerance (1) TBD Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. Refer to RETS138K drawing for military specifications of LM138K. If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications. (2) (3) Operating Temperature Range LM138 -55C TJ +150C LM338 0C TJ +125C Electrical Characteristics Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN - VOUT = 5V; and IOUT = 10 mA. (1) Symbol Parameter VREF Reference Voltage 3V (VIN - VOUT) 35V, 10 mA IOUT 5A, P 50W VRLINE Line Regulation 3V (VIN - VOUT) 35V VRLOAD Load Regulation Thermal Regulation LM138 Conditions 10 mA IOUT 5A Typ Max 1.19 1.24 1.29 V 0.005 0.01 %/V 0.02 0.04 %/V 0.1 0.3 % 0.3 0.6 % 0.002 0.01 %/W 45 100 A 0.2 5 A 5 mA (2) (2) 20 ms Pulse IADJ Adjustment Pin Current IADJ Adjustment Pin Current Change 10 mA IOUT 5A, 3V (VIN - VOUT) 35V VR/T Temperature Stability TMIN TJ TMAX 1 ILOAD(Min) Minimum Load Current VIN - VOUT = 35V 3.5 ICL Current Limit VIN - VOUT 10V DC 5 8 0.5 ms Peak 7 12 % 60 dB 75 dB 10 Hz f 10 kHz Ripple Rejection Ratio VOUT = 10V, f = 120 Hz, CADJ = 0 F VOUT = 10V, f = 120 Hz, CADJ = 10 F 2 A 0.003 RMS Output Noise, % of VOUT (2) A 1 VR/VIN (1) % VIN - VOUT = 30V VN JC Units Min Long-Term Stability TJ = 125C, 1000 Hrs Thermal Resistance, Junction to Case NDS Package 60 0.3 1 A 1 % 1 C/W These specifications are applicable for power dissipations up to 50W for the TO-3 (NDS) package and 25W for the TO-220 (NDE) package. Power dissipation is specified at these values up to 15V input-output differential. Above 15V differential, power dissipation will be limited by internal protection circuitry. All limits (i.e., the numbers in the Min. and Max. columns) are specified to TI's AOQL (Average Outgoing Quality Level). Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specifications for thermal regulation. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 Electrical Characteristics (continued) Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN - VOUT = 5V; and IOUT = 10 mA. (1) Symbol JA Parameter Thermal Resistance, Junction to Ambient (No Heat Sink) Conditions LM138 Min NDS Package Typ Max 35 Units C/W Electrical Characteristics Symbol Parameter Conditions VREF Reference Voltage 3V (VIN - VOUT) 35V, 10 mA IOUT 5A, P 50W VRLINE Line Regulation 3V (VIN - VOUT) 35V VRLOAD Load Regulation Thermal Regulation 10 mA IOUT 5A LM338 Typ Max 1.19 1.24 1.29 V 0.005 0.03 %/V 0.02 0.06 %/V 0.1 0.5 % 0.3 1 % 0.002 0.02 %/W 45 100 A 0.2 5 A (1) (1) 20 ms Pulse IADJ Adjustment Pin Current IADJ Adjustment Pin Current Change 10 mA IOUT 5A, 3V (VIN - VOUT) 35V VR/T Temperature Stability TMIN TJ TMAX 1 ILOAD(Min) Minimum Load Current VIN - VOUT = 35V 3.5 ICL Current Limit VIN - VOUT 10V mA 5 8 A 7 12 A VIN - VOUT = 30V 10 Hz f 10 kHz VR/VIN Ripple Rejection Ratio VOUT = 10V, f = 120 Hz, CADJ = 0 F VOUT = 10V, f = 120 Hz, CADJ = 10 F (1) 10 0.5 ms Peak RMS Output Noise, % of VOUT JA % DC VN JC Units Min 1 60 A 0.003 % 60 dB 75 0.3 dB Long-Term Stability TJ = 125C, 1000 hrs 1 Thermal Resistance NDS Package % 1 C/W Junction to Case NDE Package Thermal Resistance, Junction to NDS Package 35 4 C/W C/W Ambient (No Heat Sink) NDE Package 50 C/W Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specifications for thermal regulation. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 3 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com Typical Performance Characteristics 4 Current Limit Current Limit Figure 3. Figure 4. Current Limit Load Regulation Figure 5. Figure 6. Dropout Voltage Adjustment Current Figure . Figure 7. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 Typical Performance Characteristics (continued) Temperature Stability Output Impedance Figure 8. Figure 9. Minimum Operating Current Ripple Rejection Figure 10. Figure 11. Ripple Rejection Ripple Rejection Figure 12. Figure 13. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 5 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 6 Line Transient Response Load Transient Response Figure 14. Figure 15. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 APPLICATION HINTS In operation, the LM138 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage of (1) Since the 50 A current from the adjustment terminal represents an error term, the LM138 was designed to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise. EXTERNAL CAPACITORS An input bypass capacitor is recommended. A 0.1 F disc or 1 F solid tantalum on the input is suitable input bypassing for almost all applications. The device is more sensitive to the absence of input bypassiing when adjustment or output capacitors are used but the above values will eliminate the possiblity of problems. The adjustment terminal can be bypassed to ground on the LM138 to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. With a 10 F bypass capacitor 75 dB ripple rejection is obtainable at any output level. Increases over 20 F do not appreciably improve the ripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to include protection diodes to prevent the capacitor from discharging through internal low current paths and damaging the device. In general, the best type of capacitors to use are solid tantalum. Solid tantalum capacitors have low impedance even at high frequencies. Depending upon capacitor construction, it takes about 25 F in aluminum electrolytic to equal 1 F solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies; but some types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, 0.01 F disc may seem to work better than a 0.1 F disc as a bypass. Although the LM138 is stable with no output capacitors, like any feedback circuit, certain values of external capacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1 F solid tantalum (or 25 F aluminum electrolytic) on the output swamps this effect and insures stability. LOAD REGULATION The LM138 is capable of providing extremely good load regulation but a few precautions are needed to obtain maximum performance. The current set resistor connected between the adjustment terminal and the output terminal (usually 240) should be tied directly to the output of the regulator (case) rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 15V regulator with 0.05 resistance between the regulator and load will have a load regulation due to line resistance of 0.05 x IL. If the set resistor is connected near the load the effective line resistance will be 0.05 (1 + R2/R1) or in this case, 11.5 times worse. Figure 16 shows the effect of resistance between the regulator and 240 set resistor. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 7 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com 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 2 separate leads to the case. The ground of R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. PROTECTION DIODES When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Most 20 F capacitors have low enough internal series resistance to deliver 20A spikes when shorted. Although the surge is short, there is enough energy to damage parts of the IC. When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage of the regulator, and the rate of decrease of VIN. In the LM138 this discharge path is through a large junction that is able to sustain 25A surge with no problem. This is not true of other types of positive regulators. For output capacitors of 100 F or less at output of 15V or less, there is no need to use diodes. The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs when either the input or output is shorted. Internal to the LM138 is a 50 resistor which limits the peak discharge current. No protection is needed for output voltages of 25V or less and 10 F capacitance. Figure 17 shows an LM138 with protection diodes included for use with outputs greater than 25V and high values of output capacitance. D1 protects against C1 D2 protects against C2 Figure 17. Regulator with Protection Diodes 8 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 Typical Applications Regulator and Voltage Reference 1.2V-25V Adjustable Regulator Temperature Controller Full output current not available at high input-output voltages Optional--improves transient response. Output capacitors in the range of 1 F to 1000 F of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients. *Needed if device is more than 6 inches from filter capacitors. **R1 = 240 for LM138. R1, R2 as an assembly can be ordered from Bourns: MIL part no. 7105A-AT2-502 COMM part no. 7105A-AT7-502 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 9 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com Schematic Diagram Typical Applications Precision Power Regulator with Low Temperature Coefficient * Adjust for 3.75 across R1 10 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 Slow Turn-On 15V Regulator Adjustable Regulator with Improved Ripple Rejection Solid tantalum *Discharges C1 if output is shorted to ground **R1 = 240 for LM138 High Stability 10V Regulator Digitally Selected Outputs *Sets maximum VOUT **R1 = 240 for LM138 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 11 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com 15A Regulator * Minimum load--100 mA 5V Logic Regulator with Electronic Shutdown** Light Controller ** Minimum output 1.2V 12 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 0 to 22V Regulator * R1 = 240, R2 = 5k for LM138 Full output current not available at high input-output voltages 12V Battery Charger Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 13 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com Adjustable Current Regulator Precision Current Limiter 5A Current Regulator Tracking Preregulator Adjusting Multiple On-Card Regulators with Single Control* Minimum load--10 mA * All outputs within 100 mV 14 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 Power Amplifier AV = 1, RF = 10k, CF = 100 pF AV = 10, RF = 100k, CF = 10 pF Bandwidth 100 kHz Distortion 0.1% Simple 12V Battery Charger Use of RS allows low charging rates with fully charged battery. **The 1000 F is recommended to filter out input transients Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 15 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com Adjustable 15A Regulator Current Limited 6V Charger * Set max charge current to 3A ** THE 1000 F is recommended to filter out input transients. 16 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 LM138, LM338 www.ti.com SNVS771B - MAY 1998 - REVISED APRIL 2013 10A Regulator * Minimum load--100 mA Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 17 LM138, LM338 SNVS771B - MAY 1998 - REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision A (April 2013) to Revision B * 18 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 17 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM138 LM338 PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) LM138K STEEL ACTIVE TO-3 NDS 2 50 TBD Call TI Call TI -55 to 125 LM138K STEELP+ LM138K STEEL/NOPB ACTIVE TO-3 NDS 2 50 Green (RoHS & no Sb/Br) POST-PLATE Level-1-NA-UNLIM -55 to 125 LM138K STEELP+ LM338K STEEL ACTIVE TO-3 NDS 2 50 TBD Call TI Call TI 0 to 125 LM338K STEELP+ LM338K STEEL/NOPB ACTIVE TO-3 NDS 2 50 Green (RoHS & no Sb/Br) POST-PLATE Level-1-NA-UNLIM 0 to 125 LM338K STEELP+ LM338T NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM338T P+ LM338T/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM338T P+ (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 availability information 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 that lead 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 between the 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 weight in 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 continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (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 finish value 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 information provided 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. 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