LM2940/LM2940C LM2940/ LM2940C DS008822-3 LM2940CT-9 LM2940CT-12 LM2940CT-15 - Datasheet Archive

 

1A Low Dropout Regulator momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down

 

LM2940/LM2940C LM2940/LM2940C 1A Low Dropout Regulator momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940/ LM2940/ LM2940C LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. General Description The LM2940/LM2940C LM2940/LM2940C positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0.5V and a maximum of 1V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN - VOUT 3V). Designed also for vehicular applications, the LM2940/ LM2940/ LM2940C LM2940C and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can Features n n n n n n n Dropout voltage typically 0.5V @IO = 1A Output current in excess of 1A Output voltage trimmed before assembly Reverse battery protection Internal short circuit current limit Mirror image insertion protection P+ Product Enhancement tested Typical Application DS008822-3 DS008822-3 *Required if regulator is located far from power supply filter. *COUT must be at least 22 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve. Ordering Information Temperature Range 0°C TA 125°C Output Voltage 5.0 8.0 9.0 10 12 Package 15 LM2940CT-9 LM2940CT-9.0 LM2940CT-12 LM2940CT-12 LM2940CT-15 LM2940CT-15 TO-220 LM2940CS-5 LM2940CS-5.0 -40°C TA 125°C LM2940CT-5 LM2940CT-5.0 LM2940CS-9 LM2940CS-9.0 LM2940CS-12 LM2940CS-12 LM2940CS-15 LM2940CS-15 TO-263 LM2940T-5 LM2940T-5.0 LM2940T-8 LM2940T-8.0 LM2940T-9 LM2940T-9.0 LM2940T-10 LM2940T-10 LM2940T-12 LM2940T-12 LM2940S-5 LM2940S-5.0 LM2940S-8 LM2940S-8.0 LM2940S-9 LM2940S-9.0 LM2940S-10 LM2940S-10 LM2940S-12 LM2940S-12 -40°C TA 85°C LM2940IMP-5 LM2940IMP-5.0 LM2940IMP-8 LM2940IMP-8.0 LM2940IMP-9 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-10 LM2940IMP-12 LM2940IMP-12 LM2940IMP-15 LM2940IMP-15 SOT-223 Package Marking L53B L54B L0EB L70B -55°C TA 125°C LM2940K-5 LM2940K-5.0/883 LM2940K-8 LM2940K-8.0/883 L55B L56B TO-220 TO-263 SOT-223 LM2940K-12/883 LM2940K-12/883 LM2940K-15/883 LM2940K-15/883 TO-3 The physical size of the SOT-223 is too small to contain the full device part number. The package markings indicated are what will appear on the actual device. © 1997 National Semiconductor Corporation DS008822 DS008822 www.national.com LM2940/LM2940C LM2940/LM2940C 1A Low Dropout Regulator December 1997 Absolute Maximum Ratings (Notes 2, 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. TO-220 (T) Package TO-263 (S) Package SOT-223 (IMP) Package ESD Susceptibility (Note 4) LM2940S LM2940S, T, IMP 100 ms 60V LM2940K/883 LM2940K/883 20 ms 40V LM2940CS LM2940CS, T 1 ms 45V Internal Power Dissipation (Note 3) Internally Limited Maximum Junction Temperature 150°C Storage Temperature Range -65°C TJ +150°C Lead Temperature, Time for Wave Soldering TO-3 (K) Package 300°C, 10s 260°C, 10s 260°C, 4s 260°C, 4s 2 kV Operating Conditions(Note 1) Input Voltage Temperature Range LM2940K/883 LM2940K/883 LM2940T LM2940T, LM2940S LM2940S LM2940CT LM2940CT, LM2940CS LM2940CS LM2940IMP LM2940IMP 26V -55°C TA 125°C -40°C TA 125°C 0°C TA 125°C -40°C TA 85°C Electrical Characteristics VIN = VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C Output Voltage (VO) 5V 8V LM2940 LM2940 Conditions Typ Limit Limit (Note 5) Parameter LM2940/883 LM2940/883 LM2940 LM2940 (Note 6) 6.25V VIN 26V Output Voltage 5 mA IO 1A 4.85/4.75 4.85/4.75 5.15/5.25 20 50 40/50 LM2940 LM2940, LM2940/883 LM2940/883 35 50/80 50/100 LM2940C LM2940C 35 50 VO + 2V VIN 26V, IO = 5 mA Load Regulation Limit (Note 6) Units 9.4V VIN 26V 5.15/5.25 Line Regulation 5.00 LM2940/883 LM2940/883 Limit (Note 5) Typ 8.00 7.76/7.60 7.76/7.60 VMIN 8.24/8.40 8.24/8.40 VMAX 20 80 50/80 mVMAX 55 80/130 80/130 mVMAX 55 80 1000/1000 m 50 mA IO 1A Output 100 mADC and Impedance 20 mArms, fO = 120 Hz Quiescent VO +2V VIN 26V, IO = 5 mA Current 35 1000/1000 Output Noise Voltage Ripple Rejection 10 10 45/60 15/20 15/20 mAMAX 30 45/60 50/60 mAMAX 240 1000/1000 µVrms 15 30 10 50/60 15/20 LM2940C LM2940C VIN = VO + 5V, IO = 1A 15/20 700/700 LM2940 LM2940, LM2940/883 LM2940/883 55 10 Hz - 100 kHz, IO = 5 mA 150 fO = 120 Hz, 1 Vrms, IO = 100 mA LM2940 LM2940 72 60/54 66 54/48 LM2940C LM2940C fO = 1 kHz, 1 Vrms, IO = 5 mA 72 60 66 54 Long Term 60/50 20 dBMIN 54/48 32 mV/ Stability Dropout Voltage Short Circuit Current www.national.com dBMIN 1000 Hr IO = 1A IO = 100 mA (Note 7) 0.5 0.8/1.0 0.7/1.0 0.5 0.8/1.0 0.7/1.0 VMAX 110 150/200 150/200 110 150/200 150/200 mVMAX 1.9 1.6 1.5/1.3 1.9 1.6 1.6/1.3 AMIN 2 Electrical Characteristics (Continued) VIN = VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C Output Voltage (VO) 5V 8V LM2940 LM2940 Conditions Maximum Line LM2940 LM2940, T 100 ms Limit LM2940 LM2940 (Note 6) LM2940/883 LM2940/883 Limit Limit (Note 5) Typ (Note 6) Units RO = 100 Transient Typ Limit (Note 5) Parameter LM2940/883 LM2940/883 75 60/60 75 LM2940/883 LM2940/883, T 20 ms LM2940C LM2940C, T 1 ms RO = 100 55 45 Reverse Polarity DC Input Voltage LM2940 LM2940, LM2940/883 LM2940/883 -30 -15/-15 -30 -15 Reverse Polarity LM2940C LM2940C RO = 100 Transient Input LM2940 LM2940, T 100 ms -75 -50/-50 Voltage LM2940/883 LM2940/883, T 20 ms LM2940C LM2940C, T 1 ms 60/60 40/40 55 -15/-15 45 -30 -15/-15 -30 -15 -75 -50/-50 -45/-45 -55 VMIN 40/40 -15/-15 VMIN VMIN -45/-45 -45/-45 Electrical Characteristics VIN = VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C Output Voltage (VO) 9V 10V LM2940 LM2940 Parameter Conditions Typ Limit LM2940 LM2940 Typ (Note 5) 10.5V VIN 26V Output Voltage 5 mA IO 1A 9.00 8.73/8.55 VO + 2V VIN 26V, IO = 5 mA Units (Note 5) 11.5V VIN 26V 10.00 9.70/9.50 VMIN 10.30/10.50 9.27/9.45 Line Regulation Limit VMAX 20 100 mVMAX 60 90/150 65 100/165 mVMAX LM2940C LM2940C Output Impedance 90 LM2940 LM2940 Load Regulation 20 60 90 50 mA IO 1A 100 mADC and 20 mArms, fO = 120 Hz Quiescent Current 60 65 VO +2V VIN < 26V, IO = 5 mA LM2940 LM2940 Voltage Ripple Rejection 10 15/20 LM2940C LM2940C VIN = VO + 5V, IO = 1A Output Noise 10 15 30 45/60 10 Hz - 100 kHz, IO = 5 mA 270 10 15/20 mAMAX 30 45/60 mAMAX 300 µVrms fO = 120 Hz, 1 Vrms, IO = 100 mA LM2940 LM2940 64 52/46 LM2940C LM2940C Long Term Stability m 64 52 34 63 36 51/45 dBMIN mV/ 1000 Hr 3 www.national.com Electrical Characteristics (Continued) VIN = VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C Output Voltage (VO) 9V 10V LM2940 LM2940 Parameter Conditions Typ Limit LM2940 LM2940 Typ Units Limit (Note 5) (Note 5) Short Circuit IO = 1A IO = 100 mA 0.5 0.8/1.0 0.5 0.8/1.0 VMAX 110 150/200 110 150/200 mVMAX (Note 7) 1.9 1.6 1.9 1.6 AMIN LM2940 LM2940 Dropout Voltage 75 60/60 75 60/60 VMIN LM2940C LM2940C RO = 100 55 45 -30 -15/-15 VMIN -75 -50/-50 VMIN Current Maximum Line RO = 100 Transient T 100 ms Reverse Polarity DC Input Voltage LM2940 LM2940 -30 -15/-15 -30 -15 Reverse Polarity LM2940C LM2940C RO = 100 Transient Input T 100 ms Voltage LM2940 LM2940 -75 -50/-50 LM2940C LM2940C -55 -45/-45 Electrical Characteristics VIN = VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C Output Voltage (VO) 12V LM2940 LM2940 Parameter Conditions Typ 15V LM2940/833 LM2940/833 Limit Limit (Note 5) LM2940 LM2940 Typ (Note 6) 5 mA IO 1A 11.64/11.40 11.64/11.40 12.36/12.60 20 120 75/120 LM2940 LM2940, LM2940/883 LM2940/883 55 120/200 55 120 (Note 6) 120/190 LM2940C LM2940C VO + 2V VIN 26V, IO = 5 mA Load Regulation Units 16.75V VIN 26V 12.36/12.60 Line Regulation 12.00 Limit (Note 5) 13.6V VIN 26V Output Voltage LM2940/833 LM2940/833 Limit 15.00 14.55/14.25 14.55/14.25 VMIN 15.45/15.75 15.45/15.75 VMAX 20 150 95/150 mVMAX 150/240 mVMAX 70 150 1000/1000 m 15/20 mAMAX 50/60 mAMAX 1000/1000 µVrms 50 mA IO 1A Output 100 mADC and Impedance 20 mArms, fO = 120 Hz Quiescent Current VO +2V VIN 26V, IO = 5 mA 80 1000/1000 LM2940 LM2940, LM2940/883 LM2940/883 Output Noise Voltage www.national.com 10 15/20 LM2940C LM2940C VIN = VO + 5V, IO = 1A 10 15 30 45/60 10 Hz - 100 kHz, IO = 5 mA 100 15/20 10 50/60 4 30 45/60 1000/1000 360 15 450 Electrical Characteristics (Continued) VIN = VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C Output Voltage (VO) 12V LM2940 LM2940 Parameter Typ Limit Limit (Note 5) Ripple Rejection Conditions 15V LM2940/833 LM2940/833 Typ (Note 6) LM2940/833 LM2940/833 Limit Limit (Note 5) Units (Note 6) fO = 120 Hz, 1 Vrms, IO = 100 mA LM2940 LM2940 66 54/48 LM2940C LM2940C fO = 1 kHz, 1 Vrms, IO = 5 mA 66 54 Long Term dBMIN 64 IO = 1A IO = 100 mA 52 52/46 48 Stability Dropout Voltage LM2940 LM2940 48/42 dBMIN mV/ 60 1000 Hr 0.5 0.8/1.0 0.7/1.0 0.5 0.8/1.0 0.7/1.0 VMAX 110 150/200 150/200 110 150/200 150/200 mVMAX 1.9 1.6 1.6/1.3 1.9 1.6 1.6/1.3 AMIN 75 60/60 40/40 VMIN 55 45 55 45 Reverse Polarity LM2940C LM2940C, T 1 ms RO = 100 DC Input LM2940 LM2940, LM2940/883 LM2940/883 -30 -15/-15 -15/-15 VMIN Voltage -30 -15 -30 -15 Reverse Polarity LM2940C LM2940C RO = 100 Transient Input LM2940 LM2940, T 100 ms -75 -50/-50 Voltage LM2940/883 LM2940/883, T 20 ms -45/-45 VMIN -55 -45/-45 -55 -45/-45 Short Circuit (Note 7) Current Maximum Line RO = 100 Transient LM2940 LM2940, T 100 ms LM2940/883 LM2940/883, T 20 ms LM2940C LM2940C, T 1 ms 40/40 -15/-15 -45/-45 Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics. Note 2: Military specifications complied with RETS/SMD at the time of printing. For current specifications refer to RETS LM2940K-5 LM2940K-5.0, LM2940K-8 LM2940K-8.0, LM2940K-12 LM2940K-12, and LM2940K-15 LM2940K-15. SMD numbers are 5962-8958701YA 5962-8958701YA(5V), 5962-9083301YA 5962-9083301YA(8V), 5962-9088401YA 5962-9088401YA(12V), and 5962-9088501YA 5962-9088501YA(15V). Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal resistance, J-A, and the ambient temperature, TA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The value of J-A (for devices in still air with no heatsink) is 60°C/W for the TO-220 package, 80°C/W for the TO-263 package, and 174°C/W for the SOT-223 package. The effective value of J-A can be reduced by using a heatsink (see Application Hints for specific information on heatsinking). The values of J-A and J-Cfor the K02A package are 39°C/W and 4°C/W respectively. Note 4: ESD rating is based on the human body model, 100 pF discharged through 1.5 k. Note 5: All limits are guaranteed at TA = TJ = 25°C only (standard typeface) or over the entire operating temperature range of the indicated device (boldface type). All limits at TA = TJ = 25°C are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control methods. Note 6: All limits are guaranteed at TA = TJ = 25°C only (standard typeface) or over the entire operating temperature range of the indicated device (boldface type). All limits are 100% production tested and are used to calculate Outgoing Quality Levels. Note 7: Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature. 5 www.national.com Typical Performance Characteristics Dropout Voltage Dropout Voltage vs Temperature Output Voltage vs Temperature DS008822-13 DS008822-13 DS008822-14 DS008822-14 Quiescent Current vs Temperature DS008822-15 DS008822-15 Quiescent Current Quiescent Current DS008822-18 DS008822-18 DS008822-17 DS008822-17 DS008822-16 DS008822-16 Line Transient Response Load Transient Response DS008822-20 DS008822-20 DS008822-19 DS008822-19 www.national.com Ripple Rejection 6 DS008822-21 DS008822-21 Typical Performance Characteristics (Continued) Maximum Power Dissipation (TO-220) Output Impedance Maximum Power Dissipation (TO-3) DS008822-22 DS008822-22 DS008822-23 DS008822-23 DS008822-24 DS008822-24 Maximum Power Dissipation (TO-263) See (Note 3) DS008822-10 DS008822-10 7 www.national.com Typical Performance Characteristics (Continued) Low Voltage Behavior Low Voltage Behavior DS008822-25 DS008822-25 Low Voltage Behavior Low Voltage Behavior Output at Voltage Extremes Low Voltage Behavior DS008822-30 DS008822-30 DS008822-29 DS008822-29 Output at Voltage Extremes DS008822-31 DS008822-31 Output at Voltage Extremes DS008822-27 DS008822-27 DS008822-26 DS008822-26 DS008822-28 DS008822-28 Output at Voltage Extremes DS008822-32 DS008822-32 Output at Voltage Extremes DS008822-34 DS008822-34 www.national.com Low Voltage Behavior Output at Voltage Extremes DS008822-35 DS008822-35 8 DS008822-33 DS008822-33 DS008822-36 DS008822-36 Typical Performance Characteristics (Continued) Output Capacitor ESR Peak Output Current DS008822-8 DS008822-8 DS008822-6 DS008822-6 Equivalent Schematic Diagram DS008822-1 DS008822-1 Application Hints The ESR of the output capacitor will cause loop instability if it is too high or too low. The acceptable range of ESR plotted versus load current is shown in the graph below. It is essential that the output capacitor meet these requirements, or oscillations can result. EXTERNAL CAPACITORS The output capacitor is critical to maintaining regulator stability, and must meet the required conditions for both ESR (Equivalent Series Resistance) and minimum amount of capacitance. MINIMUM CAPACITANCE: The minimum output capacitance required to maintain stability is 22 µF (this value may be increased without limit). Larger values of output capacitance will give improved transient response. ESR LIMITS: 9 www.national.com Application Hints (Continued) Output Capacitor ESR DS008822-37 DS008822-37 IIN = IL ÷ IG PD = (VIN - VOUT) IL + (VIN) IG FIGURE 2. Power Dissipation Diagram The next parameter which must be calculated is the maximum allowable temperature rise, TR (max). This is calculated by using the formula: TR (max) = TJ(max) - TA (max) DS008822-6 DS008822-6 where: TJ (max) is the maximum allowable junction temperature, which is 125°C for commercial grade parts. TA (max) is the maximum ambient temperature which will be encountered in the application. Using the calculated values for TR(max) and PD, the maximum allowable value for the junction-to-ambient thermal resistance, (J-A), can now be found: (J-A) = TR (max)/PD IMPORTANT: If the maximum allowable value for (J-A) is found to be 53°C/W for the TO-220 package, 80°C/W for the TO-263 package, or 174°C/W for the SOT-223 package, no heatsink is needed since the package alone will dissipate enough heat to satisfy these requirements. If the calculated value for (J-A)falls below these limits, a heatsink is required. FIGURE 1. ESR Limits It is important to note that for most capacitors, ESR is specified only at room temperature. However, the designer must ensure that the ESR will stay inside the limits shown over the entire operating temperature range for the design. For aluminum electrolytic capacitors, ESR will increase by about 30X as the temperature is reduced from 25°C to -40°C. This type of capacitor is not well-suited for low temperature operation. Solid tantalum capacitors have a more stable ESR over temperature, but are more expensive than aluminum electrolytics. A cost-effective approach sometimes used is to parallel an aluminum electrolytic with a solid Tantalum, with the total capacitance split about 75/25% with the Aluminum being the larger value. If two capacitors are paralleled, the effective ESR is the parallel of the two individual values. The "flatter" ESR of the Tantalum will keep the effective ESR from rising as quickly at low temperatures. HEATSINKING TO-220 PACKAGE PARTS The TO-220 can be attached to a typical heatsink, or secured to a copper plane on a PC board. If a copper plane is to be used, the values of (J-A) will be the same as shown in the next section for the TO-263. If a manufactured heatsink is to be selected, the value of heatsink-to-ambient thermal resistance, (H-A), must first be calculated: (H-A) = (J-A) - (C-H) - (J-C) HEATSINKING A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible operating conditions, the junction temperature must be within the range specified under Absolute Maximum Ratings. To determine if a heatsink is required, the power dissipated by the regulator, PD, must be calculated. The figure below shows the voltages and currents which are present in the circuit, as well as the formula for calculating the power dissipated in the regulator: Where: (J-C) is defined as the thermal resistance from the junction to the surface of the case. A value of 3°C/W can be assumed for (J-C) for this calculation. is defined as the thermal resistance be(C-H) tween the case and the surface of the heatsink. The value of (C-H) will vary from about 1.5°C/W to about 2.5°C/W (depending on method of attachment, insulator, etc.). If the exact value is unknown, 2°C/W should be assumed for (C-H). When a value for (H-A) is found using the equation shown, a heatsink must be selected that has a value that is less than or equal to this number. (H-A) is specified numerically by the heatsink manufacturer in the catalog, or shown in a curve that plots temperature rise vs power dissipation for the heatsink. www.national.com 10 Application Hints (Continued) HEATSINKING TO-263 AND SOT-223 PACKAGE PARTS Both the TO-263 ("S") and SOT-223 ("MP") packages use a copper plane on the PCB and the PCB itself as a heatsink. To optimize the heat sinking ability of the plane and PCB, solder the tab of the package to the plane. Figure 3 shows for the TO-263 the measured values of (J-A) for different copper area sizes using a typical PCB with 1 ounce copper and no solder mask over the copper area used for heatsinking. DS008822-39 DS008822-39 FIGURE 4. Maximum Power Dissipation vs TAMB for the TO-263 Package Figure 5 and Figure 6 show the information for the SOT-223 package. Figure 6 assumes a (J-A) of 74°C/W for 1 ounce copper and 51°C/W for 2 ounce copper and a maximum junction temperature of 125°C. Please see AN1028 AN1028 for power enhancement techniques to be used with the SOT-223 package. DS008822-38 DS008822-38 FIGURE 3. (J-A) vs Copper (1 ounce) Area for the TO-263 Package As shown in the figure, increasing the copper area beyond 1 square inch produces very little improvement. It should also be observed that the minimum value of (J-A) for the TO-263 package mounted to a PCB is 32°C/W. As a design aid, Figure 4 shows the maximum allowable power dissipation compared to ambient temperature for the TO-263 device (assuming (J-A) is 35°C/W and the maximum junction temperature is 125°C). DS008822-40 DS008822-40 FIGURE 5. (J-A) vs Copper (2 ounce) Area for the SOT-223 Package DS008822-41 DS008822-41 FIGURE 6. Maximum Power Dissipation vs TAMB for the SOT-223 Package 11 www.national.com Connection Diagrams (TO-220) Plastic Package DS008822-2 DS008822-2 Front View Order Number LM2940CT-5 LM2940CT-5.0, LM2940CT-9 LM2940CT-9.0, LM2940CT-12 LM2940CT-12, LM2940CT-15 LM2940CT-15, LM2940T-5 LM2940T-5.0, LM2940T-8 LM2940T-8.0, LM2940T-9 LM2940T-9.0, LM2940T-10 LM2940T-10 or LM2940T-12 LM2940T-12 See NS Package Number TO3B TO-3 Metal Can Package (K) DS008822-7 DS008822-7 Bottom View Order Number LM2940K-5 LM2940K-5.0/883, LM2940K-8 LM2940K-8.0/883, LM2940K-12/883 LM2940K-12/883, LM2940K-15/883 LM2940K-15/883 See NS Package Number K02A www.national.com 12 Connection Diagrams (Continued) (TO-263) Surface-Mount Package DS008822-11 DS008822-11 Top View DS008822-12 DS008822-12 Side View Order Number LM2940CS-5 LM2940CS-5.0, LM2940CS-9 LM2940CS-9.0, LM2940CS-12 LM2940CS-12, LM2940CS-15 LM2940CS-15, LM2940S-5 LM2940S-5.0, LM2940S-8 LM2940S-8.0, LM2940S-9 LM2940S-9.0, LM2940S-10 LM2940S-10 or LM2940S-12 LM2940S-12 See NS Package Number TS3B 3-Lead SOT-223 DS008822-42 DS008822-42 (Front View) Order Part Number LM2940IMP-5 LM2940IMP-5.0 LM2940IMP-8 LM2940IMP-8.0 LM2940IMP-9 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-10 LM2940IMP-12 LM2940IMP-12 LM2940IMP-15 LM2940IMP-15 See NS Package Number MA04A MA04A 13 www.national.com 14 Physical Dimensions inches (millimeters) unless otherwise noted 3-Lead SOT-223 Package Order Part Number LM2940IMP-5 LM2940IMP-5.0 LM2940IMP-8 LM2940IMP-8.0 LM2940IMP-9 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-10 LM2940IMP-12 LM2940IMP-12 LM2940IMP-15 LM2940IMP-15 NS Package Number MA04A MA04A 15 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 2 Lead TO-3 Metal Can Package (K) Order Number LM2940K-5 LM2940K-5.0/883, LM2940K-8 LM2940K-8.0/883, LM2940K-12/883 LM2940K-12/883, LM2940K-15/883 LM2940K-15/883 NS Package Number K02A www.national.com 16 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 3-Lead TO-220 Plastic Package (T) Order Number LM2940T-5 LM2940T-5.0, LM2940T-8 LM2940T-8.0, LM2940T-9 LM2940T-9.0, LM2940T-10 LM2940T-10, LM2940T-12 LM2940T-12, LM2940CT-5 LM2940CT-5.0, LM2940CT-12 LM2940CT-12 or LM2940CT-15 LM2940CT-15 NS Package Number TO3B 17 www.national.com LM2940/LM2940C LM2940/LM2940C 1A Low Dropout Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 3-Lead TO-263 Surface Mount Package Order Number LM2940S-5 LM2940S-5.0, LM2940S-8 LM2940S-8.0, LM2940S-9 LM2940S-9.0, LM2940S-10 LM2940S-10, LM2940S-12 LM2940S-12, LM2940CS-5 LM2940CS-5.0, LM2940CS-12 LM2940CS-12 or LM2940CS-15 LM2940CS-15 NS Package Number TS3B LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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