LM2940/LM2940C 1A Low Dropout Regulator General Description The 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 inputoutput 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/ 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 momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940/ LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. 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 00882203 *Required if regulator is located far from power supply filter. **COUT must be at least 22 F 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 0C TJ 125C -40C TJ 125C -40C TJ 125C -40C TJ 85C SOT-223 Package Marking Output Voltage 5.0 8.0 9.0 10 12 Package 15 LM2940CT-5.0 LM2940CT-9.0 LM2940CT-12 LM2940CT-15 LM2940CS-5.0 LM2940CS-9.0 LM2940CS-12 LM2940CS-15 TO-263 LM2940LD-12 LM2940LD-15 LLP 1k Units Tape and Reel LM2940LDX-15 LLP 4.5k Units Tape and Reel LM2940LD-5.0 LM2940LD-8.0 LM2940LD-9.0 LM2940LD-10 LM2940LDX-5.0 LM2940LDX-8.0 LM2940LDX-9.0 LM2940LDX-10 LM2940LDX-12 LM2940T-5.0 LM2940T-8.0 LM2940T-9.0 LM2940T-10 LM2940T-12 LM2940S-5.0 LM2940S-8.0 LM2940S-9.0 LM2940S-10 LM2940S-12 LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 TO-220 TO-263 LM2940IMP-15 LM2940IMPX-5.0 LM2940IMPX-8.0 LM2940IMPX-9.0 LM2940IMPX-10 LM2940IMPX-12 LM2940IMPX-15 L53B L54B L0EB L55B L56B TO-220 SOT-223 SOT-223 in Tape and Reel L70B 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. (c) 2003 National Semiconductor Corporation DS008822 www.national.com LM2940/LM2940C 1A Low Dropout Regulator January 2003 LM2940/LM2940C Ordering Information Temperature Range (Continued) Output Voltage 5.0 -55C TJ 125C 8.0 LM2940J-5.0/883 5962-8958701EA Package 12 LM2940J-8.0/883 5962-9088301QEA 15 LM2940J-12/883 5962-9088401QEA LM2940J-15/883 5962-9088501QEA LM2940WG5.0/883 5962-8958701XA J16A WG16A For information on military temperature range products, please go to the Mil/Aero Web Site at http://www.national.com/appinfo/milaero/index.html. Connection Diagrams (TO-220) Plastic Package 3-Lead SOT-223 00882202 00882242 Front View Order Number LM2940CT-5.0, LM2940CT-9.0, LM2940CT-12, LM2940CT-15, LM2940T-5.0, LM2940T-8.0, LM2940T-9.0, LM2940T-10 or LM2940T-12 See NS Package Number TO3B Front View Order Part Number LM2940IMP-5.0, LM2940IMP-8.0, LM2940IMP-9.0, LM2940IMP-10, LM2940IMP-12 or LM2940IMP-15 See NS Package Number MP04A 16-Lead Ceramic Surface-Mount Package (WG) 16-Lead Dual-in-Line Package (J) 00882244 00882243 Top View Order Number LM2940WG5.0/883 (5962-8958701XA) See NS Package Number WG16A Top View Order Number LM2940J-5.0/883 (5962-8958701EA), LM2940J-8.0/883 (5962-9088301QEA), LM2940J-12/883 (5962-9088401QEA), LM2940J-15/883 (5962-9088501QEA) See NS Package Number J16A www.national.com 2 LM2940/LM2940C Connection Diagrams (Continued) (TO-263) Surface-Mount Package 8-Lead LLP 00882211 Top View 00882212 Side View Order Number LM2940CS-5.0, LM2940CS-9.0, LM2940CS-12, LM2940CS-15, LM2940S-5.0, LM2940S-8.0, LM2940S-9.0, LM2940S-10 or LM2940S-12 See NS Package Number TS3B 00882246 Top View Order Number LM2940LD-5.0, LM2940LD-8.0, LM2940LD-9.0, LM2940LD-10, LM2940LD-12, LM2940LD-15 See NS Package Number LDC08A Pin 2 and pin 7 are fused to center DAP Pin 5 ans 6 need to be tied together on PCB board 3 www.national.com LM2940/LM2940C Absolute Maximum Ratings SOT-223 (MP) Package (Note 1) ESD Susceptibility (Note 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LM2940S, T, MP 100 ms 60V LM2940CS, T 1 ms 45V 2 kV Operating Conditions (Note 1) Input Voltage 26V Temperature Range Internal Power Dissipation (Note 2) Maximum Junction Temperature Lead Temperature, Time for Wave Soldering TO-263 (S) Package 260C, 4s -40C TJ 85C LM2940IMP -65C TJ +150C 260C, 10s 0C TJ 125C LM2940CT, LM2940CS 150C TO-220 (T) Package -40C TJ 125C LM2940T, LM2940S Internally Limited Storage Temperature Range 260C, 4s LM2940J, LM2940WG -55C TJ 125C LM2940LD -40C TJ 125C Electrical Characteristics VIN = VO + 5V, IO = 1A, CO = 22 F, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25C. Output Voltage (VO) Parameter Conditions 5V Typ 8V LM2940 LM2940/883 Limit Limit (Note 4) (Note 5) Typ 6.25V VIN 26V Output Voltage Line Regulation 5 mA IO 1A 4.85/4.75 4.85/4.75 5.15/5.25 5.15/5.25 20 50 40/50 LM2940, LM2940/883 35 50/80 50/100 LM2940C 35 50 VO + 2V VIN 26V, 5.00 LM2940 LM2940/883 Limit Limit (Note 4) (Note 5) Units 9.4V VIN 26V 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 IO = 5 mA Load Regulation Output Impedance 50 mA IO 1A 100 mADC and 20 mArms, 35 1000/1000 55 15/20 10 15/20 15/20 mAMAX 50/60 30 45/60 50/60 mAMAX 700/700 240 1000/1000 Vrms fO = 120 Hz Quiescent VO +2V VIN 26V, Current IO = 5 mA LM2940, LM2940/883 10 15/20 LM2940C 10 15 VIN = VO + 5V, 30 45/60 IO = 1A Output Noise 10 Hz - 100 kHz, Voltage IO = 5 mA Ripple Rejection fO = 120 Hz, 1 Vrms, 150 IO = 100 mA LM2940 72 60/54 LM2940C 72 60 fO = 1 kHz, 1 Vrms, 66 54/48 66 54 60/50 dBMIN 54/48 dBMIN IO = 5 mA Long Term 20 32 mV/ Stability Dropout Voltage Short Circuit Current www.national.com 1000 Hr IO = 1A 0.5 0.8/1.0 0.7/1.0 0.5 0.8/1.0 0.7/1.0 VMAX IO = 100 mA 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 (Note 6) 4 (Continued) VIN = VO + 5V, IO = 1A, CO = 22 F, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25C. Output Voltage (VO) Parameter Conditions Maximum Line RO = 100 Transient LM2940, T 100 ms 5V Typ 75 8V LM2940 LM2940/883 Limit Limit (Note 4) (Note 5) 60/60 75 LM2940/883, T 20 ms LM2940C, T 1 ms 45 LM2940, LM2940/883 -30 -15/-15 LM2940C -30 -15 -75 -50/-50 RO = 100 DC Input Voltage Reverse Polarity RO = 100 Transient Input LM2940, T 100 ms Voltage LM2940/883, T 20 ms LM2940C, T 1 ms LM2940/883 Limit Limit (Note 4) (Note 5) 60/60 40/40 55 Reverse Polarity Typ LM2940 -15/-15 40/40 55 45 -30 -15/-15 -30 -15 -75 -50/-50 -45/-45 -55 -15/-15 Units VMIN VMIN VMIN -45/-45 -45/-45 Electrical Characteristics VIN = VO + 5V, IO = 1A, CO = 22 F, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25C. Output Voltage (VO) 9V 10V LM2940 Parameter Conditions Typ Limit LM2940 Typ (Note 4) 10.5V VIN 26V Output Voltage 5 mA IO 1A Line Regulation VO + 2V VIN 26V, Load Regulation 50 mA IO 1A 9.00 8.73/8.55 Limit Units (Note 4) 11.5V VIN 26V 10.00 9.27/9.45 9.70/9.50 VMIN 10.30/10.50 VMAX 20 90 20 100 mVMAX LM2940 60 90/150 65 100/165 mVMAX LM2940C 60 90 IO = 5 mA Output Impedance 100 mADC and 20 mArms, 60 65 m fO = 120 Hz Quiescent VO +2V VIN < 26V, Current IO = 5 mA LM2940 10 15/20 LM2940C 10 15 VIN = VO + 5V, IO = 1A 30 45/60 Output Noise 10 Hz - 100 kHz, 270 Voltage IO = 5 mA Ripple Rejection fO = 120 Hz, 1 Vrms, 10 15/20 mAMAX 30 45/60 mAMAX 300 Vrms IO = 100 mA LM2940 64 52/46 LM2940C 64 52 Long Term Stability Dropout Voltage 34 63 51/45 36 dBMIN mV/ 1000 Hr IO = 1A 0.5 0.8/1.0 0.5 0.8/1.0 VMAX IO = 100 mA 110 150/200 110 150/200 mVMAX 5 www.national.com LM2940/LM2940C Electrical Characteristics LM2940/LM2940C Electrical Characteristics (Continued) VIN = VO + 5V, IO = 1A, CO = 22 F, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25C. Output Voltage (VO) 9V 10V LM2940 Parameter Conditions Typ Limit LM2940 Typ (Note 4) Short Circuit (Note 6) Units Limit (Note 4) 1.9 1.6 1.9 1.6 AMIN LM2940 75 60/60 75 60/60 VMIN LM2940C 55 45 -30 -15/-15 VMIN -75 -50/-50 VMIN Current Maximum Line RO = 100 Transient T 100 ms Reverse Polarity RO = 100 DC Input Voltage LM2940 -30 -15/-15 LM2940C -30 -15 Reverse Polarity RO = 100 Transient Input T 100 ms Voltage LM2940 -75 -50/-50 LM2940C -55 -45/-45 Electrical Characteristics VIN = VO + 5V, IO = 1A, CO = 22 F, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25C. Output Voltage (VO) Parameter Conditions 12V Typ 15V LM2940 LM2940/833 Limit Limit (Note 4) (Note 5) Typ 13.6V VIN 26V Output Voltage 5 mA IO 1A 11.64/11.40 11.64/11.40 12.36/12.60 12.36/12.60 20 120 75/120 LM2940, LM2940/883 55 120/200 120/190 LM2940C 55 120 Line Regulation VO + 2V VIN 26V, Load Regulation 50 mA IO 1A 12.00 LM2940 LM2940/833 Limit Limit (Note 4) (Note 5) Units 16.75V VIN 26V 15.00 20 14.55/14.25 14.55/14.25 VMIN 15.45/15.75 15.45/15.75 VMAX 150 95/150 mVMAX 150/240 mVMAX 1000/1000 m 15/20 mAMAX 50/60 mAMAX 1000/1000 Vrms IO = 5 mA Output 100 mADC and Impedance 20 mArms, Quiescent Current VO +2V VIN 26V, 70 80 1000/1000 150 100 fO = 120 Hz IO = 5 mA LM2940, LM2940/883 Output Noise 10 15/20 LM2940C 10 15 VIN = VO + 5V, IO = 1A 30 45/60 10 Hz - 100 kHz, 360 Voltage IO = 5 mA Ripple Rejection fO = 120 Hz, 1 Vrms, 15/20 10 15 50/60 30 45/60 1000/1000 450 IO = 100 mA LM2940 66 54/48 LM2940C 66 54 dBMIN 64 fO = 1 kHz, 1 Vrms, 52/46 IO = 5 mA www.national.com 6 52 48/42 dBMIN (Continued) VIN = VO + 5V, IO = 1A, CO = 22 F, unless otherwise specified. Boldface limits apply over the entire operating temperature range of the indicated device. All other specifications apply for TA = TJ = 25C. Output Voltage (VO) Parameter 12V Conditions Long Term Short Circuit LM2940/833 Limit Limit (Note 4) (Note 5) Typ 48 Stability Dropout Voltage Typ 15V LM2940 LM2940 LM2940/833 Limit Limit (Note 4) (Note 5) Units mV/ 60 1000 Hr IO = 1A 0.5 0.8/1.0 0.7/1.0 0.5 0.8/1.0 0.7/1.0 VMAX IO = 100 mA 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 -15/-15 VMIN -30 -15 -45/-45 VMIN -55 -45/-45 (Note 6) Current Maximum Line RO = 100 Transient LM2940, T 100 ms LM2940/883, T 20 ms LM2940C, T 1 ms 40/40 Reverse Polarity RO = 100 DC Input LM2940, LM2940/883 -30 -15/-15 Voltage LM2940C -30 -15 -75 -50/-50 -55 -45/-45 Reverse Polarity RO = 100 Transient Input LM2940, T 100 ms Voltage LM2940/883, T 20 ms LM2940C, T 1 ms -15/-15 -45/-45 Thermal Performance Thermal Resistance Junction-to-Case 3-Lead TO-220 4 C/W 3-Lead TO-263 4 C/W Thermal Resistance Junction-to-Ambient 3-Lead TO-220 60 C/W 3-Lead TO-263 80 C/W 8-Lead LLP (Note 2) 35 C/W 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: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal resistance, JA, 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 JA (for devices in still air with no heatsink) is 60C/W for the TO-220 package, 80C/W for the TO-263 package, and 174C/W for the SOT-223 package. The effective value of JA can be reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of JA for the LLP package is specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187. It is recommended that 6 vias be placed under the center pad to improve thermal performance. Note 3: ESD rating is based on the human body model, 100 pF discharged through 1.5 k. Note 4: All limits are guaranteed at TA = TJ = 25C only (standard typeface) or over the entire operating temperature range of the indicated device (boldface type). All limits at TA = TJ = 25C are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control methods. Note 5: All limits are guaranteed at TA = TJ = 25C 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 6: Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature. 7 www.national.com LM2940/LM2940C Electrical Characteristics LM2940/LM2940C Typical Performance Characteristics Dropout Voltage Dropout Voltage vs. Temperature 00882214 00882213 Output Voltage vs. Temperature Quiescent Current vs. Temperature 00882215 00882216 Quiescent Current Quiescent Current 00882217 www.national.com 00882218 8 LM2940/LM2940C Typical Performance Characteristics (Continued) Line Transient Response Load Transient Response 00882220 00882219 Ripple Rejection Low Voltage Behavior 00882225 00882221 Low Voltage Behavior Low Voltage Behavior 00882227 00882226 9 www.national.com LM2940/LM2940C Typical Performance Characteristics (Continued) Low Voltage Behavior Low Voltage Behavior 00882228 00882229 Low Voltage Behavior Output at Voltage Extremes 00882230 00882231 Output at Voltage Extremes Output at Voltage Extremes 00882232 www.national.com 00882233 10 LM2940/LM2940C Typical Performance Characteristics (Continued) Output at Voltage Extremes Output at Voltage Extremes 00882234 00882235 Output at Voltage Extremes Output Capacitor ESR 00882236 00882206 Peak Output Current Output Impedance 00882222 00882208 11 www.national.com LM2940/LM2940C Typical Performance Characteristics (Continued) Maximum Power Dissipation (TO-220) Maximum Power Dissipation (TO-3) 00882224 00882223 Maximum Power Dissipation (TO-263) See (Note 2) 00882210 www.national.com 12 LM2940/LM2940C Equivalent Schematic Diagram 00882201 Application Hints Output Capacitor ESR 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 F (this value may be increased without limit). Larger values of output capacitance will give improved transient response. ESR LIMITS: 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. 00882206 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 25C to -40C. 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 13 www.national.com LM2940/LM2940C Application Hints HEATSINKING TO-220 PACKAGE PARTS (Continued) 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 (JA) will be the same as shown in the next section for the TO-263. 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. If a manufactured heatsink is to be selected, the value of heatsink-to-ambient thermal resistance, (H-A), must first be calculated: (H-A) = (JA) - (C-H) - (J-C) Where: (J-C) is defined as the thermal resistance from the junction to the surface of the case. A value of 3C/W can be assumed for (J-C) for this calculation. (C-H) is defined as the thermal resistance between the case and the surface of the heatsink. The value of (C-H) will vary from about 1.5C/W to about 2.5C/W (depending on method of attachment, insulator, etc.). If the exact value is unknown, 2C/W should be assumed for (C-H). 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: When a value for (H-A) is found using the equation shown, a heatsink must be selected that has a value that is less than or equal to this number. (H-A) is specified numerically by the heatsink manufacturer in the catalog, or shown in a curve that plots temperature rise vs power dissipation for the heatsink. HEATSINKING TO-263 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 (JA) for different copper area sizes using a typical PCB with 1 ounce copper and no solder mask over the copper area used for heatsinking. 00882237 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) where: TJ (max) is the maximum allowable junction temperature, which is 125C 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, (JA), can now be found: (JA) = TR (max)/PD 00882238 IMPORTANT: If the maximum allowable value for (JA) is found to be 53C/W for the TO-220 package, 80C/W for the TO-263 package, or 174C/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 (JA)falls below these limits, a heatsink is required. www.national.com FIGURE 3. (JA) 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 (JA) for the TO-263 package mounted to a PCB is 32C/W. As a design aid, Figure 4 shows the maximum allowable power dissipation compared to ambient temperature for the TO-263 device (assuming (JA) is 35C/W and the maximum junction temperature is 125C). 14 LM2940/LM2940C Application Hints (Continued) 00882240 FIGURE 5. (JA) vs. Copper (2 ounce) Area for the SOT-223 Package 00882239 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 (JA) of 74C/W for 1 ounce copper and 51C/W for 2 ounce copper and a maximum junction temperature of 125C. 00882241 FIGURE 6. Maximum Power Dissipation vs. TAMB for the SOT-223 Package 15 www.national.com LM2940/LM2940C Physical Dimensions inches (millimeters) unless otherwise noted 3-Lead SOT-223 Package Order Part Number LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 LM2940IMP-15 NS Package Number MP04A 16 Lead Dual-in-Line Package (J) Order Number LM2940J-5.0/883 (5962-8958701EA), LM2940J-8.0/883 (5962-9088301QEA), LM2940J-12/883 (5962-9088401QEA), LM2940J-15/883 (5962-9088501QEA) See NS Package Number J16A www.national.com 16 LM2940/LM2940C Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16 Lead Surface Mount Package (WG) Order Number LM2940WG5.0/883 (5962-8958701XA) See NS Package Number WG16A 3-Lead TO-220 Plastic Package (T) Order Number LM2940T-5.0, LM2940T-8.0, LM2940T-9.0, LM2940T-10, LM2940T-12, LM2940CT-5.0, LM2940CT-12 or LM2940CT-15 NS Package Number TO3B 17 www.national.com LM2940/LM2940C Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 3-Lead TO-263 Surface Mount Package (MP) Order Number LM2940S-5.0, LM2940S-8.0, LM2940S-9.0, LM2940S-10, LM2940S-12, LM2940CS-5.0, LM2940CS-12 or LM2940CS-15 NS Package Number TS3B 8-Lead LLP Order Number LM2940LD-5.0, LM2940LD-8.0, LM2940LD-9.0, LM2940LD-10, LM2940LD-12 or LM2940LD-15 NS Package Number LDC08A www.national.com 18 LM2940/LM2940C 1A Low Dropout Regulator Notes 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure 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. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Support Center Fax: 65-6250 4466 Email: ap.support@nsc.com Tel: 65-6254 4466 National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: nsj.crc@jksmtp.nsc.com Tel: 81-3-5639-7560 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.