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LM2940/LM2940C 1A Low Dropout Regulator
June 1999
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 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/ 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
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to the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.
*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
Ordering Information
Temperature Range 0C TA 125C -40C TA 125C -40C TA 85C SOT-223 Package Marking Output Voltage 5.0 LM2940CT-5.0 LM2940CS-5.0 LM2940T-5.0 LM2940S-5.0 LM2940IMP-5.0 L53B LM2940T-8.0 LM2940S-8.0 LM2940IMP-8.0 L54B 8.0 9.0 LM2940CT-9.0 LM2940CS-9.0 LM2940T-9.0 LM2940S-9.0 LM2940IMP-9.0 L0EB LM2940T-10 LM2940S-10 LM2940IMP-10 L55B 10 12 LM2940CT-12 LM2940CS-12 LM2940T-12 LM2940S-12 LM2940IMP-12 L56B LM2940IMP-15 L70B 15 LM2940CT-15 LM2940CS-15 Package TO-220 TO-263 TO-220 TO-263 SOT-223
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.
Temperature Range -55C TA 125C
Output Voltage 5.0 LM2940J-5.0/883 5962-8958701EA LM2940WG5.0/883 5962-8958701XA 8.0 LM2940J-8.0/883 5962-9088301QEA 12 LM2940J-12/883 5962-9088401QEA 15 LM2940J-15/883 5962-9088501QEA
Package 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.
(c) 1999 National Semiconductor Corporation
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Connection Diagrams
(TO-220) Plastic Package 3-Lead SOT-223
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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 16-Lead Dual-in-Line Package (J)
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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 MA04A
16-Lead Ceramic Surface-Mount Package (WG)
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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
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Top View Order Number LM2940WG5.0/883 (5962-8958701XA) See NS Package Number WG16A
(TO-263) Surface-Mount Package
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Top View
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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
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Absolute Maximum Ratings (Note 1)
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 Internal Power Dissipation (Note 2) Internally Limited Maximum Junction Temperature 150C Storage Temperature Range -65C TJ +150C Lead Temperature, Time for Wave Soldering TO-220 (T) Package 260C, 10s
TO-263 (S) Package SOT-223 (MP) Package ESD Susceptibility (Note 3)
260C, 4s 260C, 4s 2 kV
Operating Conditions (Note 1)
Input Voltage Temperature Range LM2940T, LM2940S LM2940CT, LM2940CS LM2940IMP LM2940J, LM2940WG 26V -40C TA 125C 0C TA 125C -40C TA 85C -55C TA 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 Typ 5V LM2940 Limit (Note 4) Output Voltage Line Regulation Load Regulation 5 mA IO 1A VO + 2V VIN 26V, IO = 5 mA 50 mA IO 1A LM2940, LM2940/883 LM2940C Output Impedance Quiescent Current 100 mADC and 20 mArms, fO = 120 Hz VO +2V VIN 26V, IO = 5 mA LM2940, LM2940/883 LM2940C VIN = VO + 5V, IO = 1A Output Noise Voltage Ripple Rejection 10 Hz - 100 kHz, IO = 5 mA fO = 120 Hz, 1 Vrms, IO = 100 mA LM2940 LM2940C fO = 1 kHz, 1 Vrms, IO = 5 mA Long Term Stability Dropout Voltage Short Circuit Current IO = 1A IO = 100 mA (Note 6) 0.5 110 1.9 0.8/1.0 150/200 1.6 0.7/1.0 150/200 1.5/1.3 0.5 110 1.9 0.8/1.0 150/200 1.6 0.7/1.0 150/200 1.6/1.3 72 72 60/54 60 60/50 20 32 66 66 54/48 54 54/48 dBMIN mV/ 1000 Hr VMAX mVMAX AMIN dBMIN 10 10 30 150 15/20 15 45/60 50/60 700/700 30 240 45/60 50/60 1000/1000 mAMAX Vrms 15/20 10 15/20 15/20 mAMAX 35 1000/1000 55 1000/1000 m 35 35 50/80 50 50/100 55 55 80/130 80 80/130 mVMAX 5.00 20 4.85/4.75 5.15/5.25 50 LM2940/883 Limit (Note 5) 4.85/4.75 5.15/5.25 40/50 20 8.00 Typ 8V LM2940 Limit (Note 4) 7.76/7.60 8.24/8.40 80 LM2940/883 Limit (Note 5) 7.76/7.60 8.24/8.40 50/80 VMIN VMAX mVMAX Units
6.25V VIN 26V
9.4V VIN 26V
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Electrical Characteristics
Output Voltage (VO) Parameter Maximum Line Transient Conditions RO = 100 LM2940, T 100 ms
(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. 5V LM2940 Typ Limit (Note 4) 75 55 -30 -30 -75 -55 60/60 40/40 45 -15/-15 -15 -50/-50 -45/-45 -45/-45 -15/-15 55 -30 -30 -75 45 -15/-15 -15 -50/-50 -45/-45 VMIN -15/-15 VMIN LM2940/883 Limit (Note 5) 75 Typ 8V LM2940 Limit (Note 4) 60/60 40/40 LM2940/883 Limit (Note 5) Units
LM2940/883, T 20 ms Reverse Polarity DC Input Voltage Reverse Polarity Transient Input Voltage LM2940C, T 1 ms RO = 100 LM2940, LM2940/883 LM2940C RO = 100 LM2940, T 100 ms LM2940/883, T 20 ms LM2940C, T 1 ms
VMIN
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 Typ 9V LM2940 Limit (Note 4) 10.5V VIN 26V Output Voltage Line Regulation Load Regulation 5 mA IO 1A VO + 2V VIN 26V, IO = 5 mA 50 mA IO 1A LM2940 LM2940C Output Impedance 100 mADC and 20 mArms, fO = 120 Hz Quiescent Current VO +2V VIN < 26V, IO = 5 mA LM2940 LM2940C VIN = VO + 5V, IO = 1A Output Noise Voltage Ripple Rejection 10 Hz - 100 kHz, IO = 5 mA fO = 120 Hz, 1 Vrms, IO = 100 mA LM2940 LM2940C Long Term Stability Dropout Voltage IO = 1A IO = 100 mA 64 64 34 0.5 110
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10V LM2940 Typ Limit (Note 4) 11.5V VIN 26V 10.00 20 9.70/9.50 10.30/10.50 100 VMIN VMAX mVMAX Units
9.00 20
8.73/8.55 9.27/9.45 90
60 60 60
90/150 90
65
100/165
mVMAX
65
m
10 10 30 270
15/20 15 45/60
10 30 300
15/20 45/60
mAMAX mAMAX Vrms
52/46 52
63 36
51/45
dBMIN mV/ 1000 Hr
0.8/1.0 150/200
0.5 110
0.8/1.0 150/200
VMAX mVMAX
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Electrical Characteristics
Output Voltage (VO) Parameter Short Circuit Current Maximum Line Transient RO = 100 T 100 ms LM2940 Reverse Polarity DC Input Voltage Reverse Polarity Transient Input Voltage LM2940C RO = 100 LM2940 LM2940C RO = 100 T 100 ms LM2940 LM2940C
(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. 9V LM2940 Conditions (Note 6) Typ 1.9 Limit (Note 4) 1.6 1.9 Typ 10V LM2940 Limit (Note 4) 1.6 AMIN Units
75 55 -30 -30
60/60 45 -15/-15 -15
75
60/60
VMIN
-30
-15/-15
VMIN
-75 -55
-50/-50 -45/-45
-75
-50/-50
VMIN
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 Typ 12V LM2940 Limit (Note 4) Output Voltage Line Regulation Load Regulation 5 mA IO 1A VO + 2V VIN 26V, IO = 5 mA 50 mA IO 1A LM2940, LM2940/883 LM2940C Output Impedance Quiescent Current 100 mADC and 20 mArms, fO = 120 Hz VO +2V VIN 26V, IO = 5 mA LM2940, LM2940/883 LM2940C VIN = VO + 5V, IO = 1A Output Noise Voltage Ripple Rejection 10 Hz - 100 kHz, IO = 5 mA fO = 120 Hz, 1 Vrms, IO = 100 mA LM2940 LM2940C fO = 1 kHz, 1 Vrms, IO = 5 mA 66 66 54/48 54 52/46 64 52 48/42 dBMIN dBMIN 10 10 30 360 15/20 15 45/60 50/60 1000/1000 15/20 10 30 450 15 45/60 50/60 1000/1000 mAMAX Vrms 15/20 mAMAX 80 1000/1000 100 1000/1000 m 55 55 120/200 120 120/190 70 150 150/240 mVMAX 12.00 20 11.64/11.40 12.36/12.60 120 LM2940/833 Limit (Note 5) 11.64/11.40 12.36/12.60 75/120 20 15.00 Typ 15V LM2940 Limit (Note 4) 14.55/14.25 15.45/15.75 150 LM2940/833 Limit (Note 5) 14.55/14.25 15.45/15.75 95/150 VMIN VMAX mVMAX Units
13.6V VIN 26V
16.75V VIN 26V
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Electrical Characteristics
Output Voltage (VO) Parameter Long Term Stability Dropout Voltage Short Circuit Current Maximum Line Transient RO = 100 LM2940, T 100 ms LM2940/883, T 20 ms Reverse Polarity DC Input Voltage Reverse Polarity Transient Input Voltage LM2940C, T 1 ms RO = 100 LM2940, LM2940/883 LM2940C RO = 100 LM2940, T 100 ms LM2940/883, T 20 ms LM2940C, T 1 ms IO = 1A IO = 100 mA (Note 6) Conditions
(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. 12V LM2940 Typ Limit (Note 4) 48 0.5 110 1.9 0.8/1.0 150/200 1.6 0.7/1.0 150/200 1.6/1.3 LM2940/833 Limit (Note 5) 60 0.5 110 1.9 0.8/1.0 150/200 1.6 0.7/1.0 150/200 1.6/1.3 Typ 15V LM2940 Limit (Note 4) LM2940/833 Limit (Note 5) mV/ 1000 Hr VMAX mVMAX AMIN Units
75 55 -30 -30 -75 -55
60/60 40/40 45 -15/-15 -15 -50/-50 -45/-45 -45/-45 -55 -45/-45 -45/-45 VMIN -15/-15 -30 -15 55 45 -15/-15 VMIN 40/40 VMIN
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, 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 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 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 39C/W and 4C/W respectively. 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.
Typical Performance Characteristics
Dropout Voltage Dropout Voltage vs Temperature Output Voltage vs Temperature
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Typical Performance Characteristics
Quiescent Current vs Temperature
(Continued) Quiescent Current
Quiescent Current
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Line Transient Response
Load Transient Response
Ripple Rejection
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Low Voltage Behavior
Low Voltage Behavior
Low Voltage Behavior
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Low Voltage Behavior
Low Voltage Behavior
Low Voltage Behavior
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Typical Performance Characteristics
Output at Voltage Extremes
(Continued)
Output at Voltage Extremes
Output at Voltage Extremes
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Output at Voltage Extremes
Output at Voltage Extremes
Output at Voltage Extremes
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Output Capacitor ESR
Peak Output Current
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Typical Performance Characteristics
Output Impedance
(Continued) Maximum Power Dissipation (TO-3)
Maximum Power Dissipation (TO-220)
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Maximum Power Dissipation (TO-263) See (Note 2)
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Equivalent Schematic Diagram
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Application Hints
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. Output Capacitor ESR
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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 parallel
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Application Hints
(Continued)
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 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:
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) 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. 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 1.5C/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). 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. Where: (J-C)
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.
DS008822-37
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) 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, (J-A), can now be found: (J-A) = TR (max)/PD IMPORTANT: If the maximum allowable value for (J-A) 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 (J-A)falls below these limits, a heatsink is required. 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.
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 32C/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 35C/W and the maximum junction temperature is 125C).
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Application Hints
(Continued)
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DS008822-39
FIGURE 5. (J-A) vs Copper (2 ounce) Area for the SOT-223 Package
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 74C/W for 1 ounce copper and 51C/W for 2 ounce copper and a maximum junction temperature of 125C.
DS008822-41
FIGURE 6. Maximum Power Dissipation vs TAMB for the SOT-223 Package
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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 MA04A
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Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
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
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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
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Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
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
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LM2940/LM2940C 1A Low Dropout Regulator
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
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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.
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