LM2940/LM2940C Dropout Regulator LM2940/LM2940C positive voltage
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LM2940/LM2940C Dropout Regulator
LM2940/LM2940C Dropout Regulator
LM2940/LM2940C positive voltage regulator features ability source output current with dropout voltage typically 0.5V maximum over entire temperature range. Furthermore, quiescent current reduction circuit been included which reduces ground current when differential between input voltage output voltage exceeds approximately quiescent current with output current input-output differential therefore only Higher quiescent currents only exist when regulator dropout mode (VIN VOUT 3V). Designed also vehicular applications, LM2940/ LM2940C regulated circuitry protected from reverse battery installations 2-battery jumps. During line transients, such load dump when input voltage momentarily exceed specified maximum operating voltage, regulator will automatically shut down protect both internal circuits load. LM2940/LM2940C cannot harmed temporary mirror-image insertion. Familiar regulator features such short circuit thermal overload protection also provided.
Features
Dropout voltage typically 0.5V Output current excess Output voltage trimmed before assembly Reverse battery protection Internal short circuit current limit Mirror image insertion protection Product Enhancement tested
Typical Application
882203
*Required regulator located from power supply filter. **COUT must least maintain stability. increased without bound maintain regulation during transients. Locate close possible regulator. This capacitor must rated over same operating temperature range regulator critical; curve.
Ordering Information
Temp Range Output Voltage LM2940CT-5.0 LM2940CS-5.0 LM2940CSX -5.0 LM2940CT-9.0 LM2940CS-9.0 LM2940CSX -9.0 LM2940CT-12 LM2940CS-12 LM2940CSX LM2940CT-15 LM2940CS-15 LM2940CSX TO-263 Package TO-220
125°C
LM2940LD-5.0 -40°C
LM2940LD-8.0
LM2940LD-9.0
LM2940LD-10
LM2940LD-12
Units LM2940LD-15 Tape Reel 4.5k Units Tape Reel TO-220 TO-263
125°C LM2940LDX -5.0 LM2940LDX -8.0 LM2940LDX -9.0 LM2940LDX LM2940LDX LM2940LDX
-40°C
LM2940T-5.0 LM2940S-5.0 LM2940SX-5.0
LM2940T-8.0 LM2940S-8.0 LM2940SX-8.0
LM2940T-9.0 LM2940S-9.0 LM2940SX-9.0
LM2940T-10 LM2940S-10 LM2940SX-10
LM2940T-12 LM2940S-12 LM2940SX-12
125°C
2007 National Semiconductor Corporation
8822
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LM2940/LM2940C
Temp Range -40°C
Output Voltage
Package
LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 LM2940IMP-15 SOT-223 LM2940IMPX -5.0 L53B LM2940IMPX -8.0 L54B LM2940IMPX -9.0 L0EB LM2940IMPX L55B LM2940IMPX L56B LM2940IMPX L70B SOT-223 Tape Reel
85°C Marking
physical size SOT-223 small contain full device part number. package markings indicated what will appear actual device.
Mil-Aero Ordering Information Temperature Range -55°C Output Voltage LM2940J-5.0/883 5962-8958701EA LM2940WG5.0/883 5962-8958701XA LM2940J-12/883 5962-9088401QEA LM2940WG5-12/883 LM2940J-15/883 5962-9088501QEA LM2940WG5-15/883 Package J16A WG16A
125°C
information military temperature range products, please Mil/Aero Site
Connection Diagrams
TO-220 Plastic Package SOT-223 (MP) 3-Lead
882202
Front View Package Number TO3B 16-Lead Dual-in-Line Package
882242
Front View Package Number MP04A 16-Lead Ceramic Surface-Mount Package (WG)
882243
882244
View Package Number J16A TO-263 Surface-Mount Package
View Package Number WG16A (LD) 8-Lead
882211
View
882212
882246
Side View Package Number TS3B
fused center need tied together board
View Package Number LDC08A
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LM2940/LM2940C
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. LM2940S, LM2940CS, Internal Power Dissipation (Note Maximum Junction Temperature Storage Temperature Range Soldering Temperature (Note TO-220 (T), Wave TO-263 Internally Limited 150°C -65°C +150°C 260°C, 235°C,
SOT-223 (MP) LLP-8 (LD) Susceptibility (Note
260°C, 235°C, (Note -40°C 125°C
Operating Conditions
Input Voltage Temperature Range LM2940T, LM2940S LM2940CT, LM2940CS LM2940IMP LM2940J, LM2940WG LM2940LD
-55°C 125°C -40°C 125°C
-40°C 85°C
125°C
Electrical Characteristics
unless otherwise specified. Boldface limits apply over entire operating temperature range indicated device. other specifications apply 25°C. Output Voltage (VO) Parameter Conditions LM2940 Limit (Note 4.85/4.75 5.15/5.25 Line Regulation Load Regulation 26V, LM2940, LM2940/883 LM2940C Output Impedance Quiescent Current mADC mArms, 26V, LM2940, LM2940/883 LM2940C Output Noise Voltage Ripple Rejection kHz, Vrms, LM2940 LM2940C kHz, Vrms, Long Term Stability Dropout Voltage 0.8/1.0 150/200 0.7/1.0 150/200 0.8/1.0 150/200 0.7/1.0 150/200 1000 VMAX mVMAX 60/54 60/50 54/48 54/48 dBMIN dBMIN 700/700 1000/1000 Vrms 15/20 45/60 50/60 45/60 50/60 mAMAX 15/20 15/20 15/20 mAMAX 50/80 1000/1000 50/100 80/130 1000/1000 80/130 mVMAX LM2940/883 Limit (Note 4.85/4.75 5.15/5.25 40/50 LM2940 Limit (Note 7.76/7.60 8.24/8.40 LM2940/883 Limit (Note 7.76/7.60 8.24/8.40 50/80 Units
6.25V Output Voltage 5.00 8.00
9.4V VMIN VMAX mVMAX
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LM2940/LM2940C
Output Voltage (VO) Parameter Short Circuit Current Maximum Line Transient Conditions (Note LM2940, LM2940/883, LM2940C, Reverse Polarity Input Voltage Reverse Polarity Transient Input Voltage LM2940, LM2940/883 LM2940C LM2940, LM2940/883, LM2940C,
LM2940 Limit (Note LM2940/883 Limit (Note 1.5/1.3
LM2940 Limit (Note LM2940/883 Limit (Note 1.6/1.3 Units
AMIN
60/60 40/40
-15/-15 -45/-45
60/60 40/40 -15/-15 -50/-50 -45/-45 -15/-15
VMIN
-15/-15 -50/-50 -45/-45
VMIN
VMIN
Electrical Characteristics
unless otherwise specified. Boldface limits apply over entire operating temperature range indicated device. other specifications apply 25°C. Output Voltage (VO) Parameter Conditions LM2940 Limit (Note 8.73/8.55 9.27/9.45 Line Regulation Load Regulation 26V, LM2940 LM2940C Output Impedance mADC mArms, Quiescent Current 26V, LM2940 LM2940C Output Noise Voltage Ripple Rejection kHz, Vrms, LM2940 LM2940C Long Term Stability 52/46 1000 51/45 dBMIN 15/20 45/60 45/60 mAMAX Vrms 15/20 mAMAX 90/150 100/165 mVMAX LM2940 Limit (Note 9.70/9.50 10.30/10.50 Units
10.5V Output Voltage 9.00
11.5V 10.00 VMIN VMAX mVMAX
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LM2940/LM2940C
Output Voltage (VO) Parameter Dropout Voltage Short Circuit Current Maximum Line Transient LM2940 LM2940C Reverse Polarity Input Voltage Reverse Polarity Transient Input Voltage LM2940 LM2940C LM2940 LM2940C (Note Conditions
LM2940 Limit (Note 0.8/1.0 150/200
LM2940 Limit (Note 0.8/1.0 150/200 Units
VMAX mVMAX AMIN
60/60 -15/-15
60/60
VMIN
-15/-15
VMIN
-50/-50 -45/-45
-50/-50
VMIN
Electrical Characteristics
unless otherwise specified. Boldface limits apply over entire operating temperature range indicated device. other specifications apply 25°C. Output Voltage (VO) Parameter Conditions LM2940 Limit (Note 11.64/11.40 12.36/12.60 Line Regulation Load Regulation 26V, LM2940, LM2940/883 LM2940C Output Impedance Quiescent Current mADC mArms, 26V, LM2940, LM2940/883 LM2940C Output Noise Voltage kHz, 15/20 45/60 50/60 1000/1000 15/20 45/60 50/60 1000/1000 mAMAX Vrms 15/20 mAMAX 120/200 1000/1000 120/190 1000/1000 150/240 mVMAX LM2940/833 Limit (Note 11.64/11.40 12.36/12.60 75/120 LM2940 Limit (Note 14.55/14.25 15.45/15.75 LM2940/833 Limit (Note 14.55/14.25 15.45/15.75 95/150 Units
13.6V Output Voltage 12.00 15.00
16.75V VMIN VMAX mVMAX
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LM2940/LM2940C
Output Voltage (VO) Parameter Ripple Rejection Conditions Vrms, LM2940 LM2940C kHz, Vrms, Long Term Stability Dropout Voltage Short Circuit Current Maximum Line Transient (Note LM2940, LM2940/883, LM2940C, Reverse Polarity Input Voltage Reverse Polarity Transient Input Voltage LM2940, LM2940/883 LM2940C LM2940, LM2940/883, LM2940C,
LM2940 Limit (Note LM2940/833 Limit (Note
LM2940 Limit (Note LM2940/833 Limit (Note Units
54/48 52/46 0.8/1.0 150/200 0.7/1.0 150/200 1.6/1.3 0.8/1.0 150/200 0.7/1.0 150/200 1.6/1.3 48/42
dBMIN dBMIN 1000 VMAX mVMAX AMIN
60/60 40/40 -15/-15 -15/-15 VMIN 40/40 VMIN
-15/-15 -50/-50
-45/-45 -45/-45 -45/-45
-45/-45
VMIN
Thermal Performance
Thermal Resistance Junction-to-Case, (JC) Thermal Resistance Junction-to-Ambient, (JA) 3-Lead TO-220 3-Lead TO-263 3-Lead TO-220 (Note 3-Lead TO-263 (Note SOT-223(Note 8-Lead (Note °C/W °C/W
Note Absolute Maximum Ratings limits beyond which damage device occur. Operating Conditions conditions under which device functions specifications might guaranteed. guaranteed specifications test conditions Electrical Characteristics. Note maximum allowable power dissipation function maximum junction temperature, junction-to-ambient thermal resistance, ambient temperature, Exceeding maximum allowable power dissipation will cause excessive temperature, regulator will into thermal shutdown. value (for devices still with heatsink) 60°C/W TO-220 package, 80°C/W TO-263 package, 174°C/W SOT-223 package. effective value reduced using heatsink (see Application Hints specific information heatsinking). value package specifically dependent trace area, trace material, number layers thermal vias. improved thermal resistance power dissipation package, refer Application Note AN-1187. recommended that vias placed under center improve thermal performance. Note Refer JEDEC J-STD-020C surface mount device (SMD) package reflow profiles conditions. Unless otherwise stated, temperature time Sn-Pb (STD) only. Note rating based human body model, discharged through Note limits guaranteed 25°C only (standard typeface) over entire operating temperature range indicated device (boldface type). limits 25°C 100% production tested. limits temperature extremes guaranteed correlation using standard Statistical Quality Control methods. Note limits guaranteed 25°C only (standard typeface) over entire operating temperature range indicated device (boldface type). limits 100% production tested used calculate Outgoing Quality Levels. Note Output current will decrease with increasing temperature will drop below maximum specified temperature.
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LM2940/LM2940C
Typical Performance Characteristics
Dropout Voltage Dropout Voltage Temperature
882213
882214
Output Voltage Temperature
Quiescent Current Temperature
882215
882216
Quiescent Current
Quiescent Current
882217
882218
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LM2940/LM2940C
Line Transient Response
Load Transient Response
882219
882220
Ripple Rejection
Voltage Behavior
882221
882225
Voltage Behavior
Voltage Behavior
882226
882227
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LM2940/LM2940C
Voltage Behavior
Voltage Behavior
882228
882229
Voltage Behavior
Output Voltage Extremes
882230
882231
Output Voltage Extremes
Output Voltage Extremes
882232
882233
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LM2940/LM2940C
Output Voltage Extremes
Output Voltage Extremes
882234
882235
Output Voltage Extremes
Output Capacitor
882236 882206
Peak Output Current
Output Impedance
882208
882222
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LM2940/LM2940C
Maximum Power Dissipation (TO-220)
Maximum Power Dissipation (SOT-223)
882224 882223
Maximum Power Dissipation (TO-263)
882210
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LM2940/LM2940C
Equivalent Schematic Diagram
882201
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LM2940/LM2940C
Application Information
EXTERNAL CAPACITORS output capacitor critical maintaining regulator stability, must meet required conditions both (Equivalent Series Resistance) minimum amount capacitance. MINIMUM CAPACITANCE: minimum output capacitance required maintain stability (this value increased without limit). Larger values output capacitance will give improved transient response. LIMITS: output capacitor will cause loop instability high low. acceptable range plotted versus load current shown graph below. essential that output capacitor meet these requirements, oscillations result.
temperature must within range specified under Absolute Maximum Ratings. determine heatsink required, power dissipated regulator, must calculated. figure below shows voltages currents which present circuit, well formula calculating power dissipated regulator:
882237
(VIN VOUT) (VIN)
Output Capacitor FIGURE Power Dissipation Diagram next parameter which must calculated maximum allowable temperature rise, TR(MAX). This calculated using formula: TR(MAX) TJ(MAX) TA(MAX) where: TJ(MAX) maximum allowable junction temperature, which 125°C commercial grade parts. TA(MAX) maximum ambient temperature which will encountered application. Using calculated values TR(MAX) maximum allowable value junction-to-ambient thermal resistance, (JA), found: (JA) TR(MAX) IMPORTANT: maximum allowable value (JA) found 53°C/W TO-220 package, 80°C/W TO-263 package, 174°C/W SOT-223 package, heatsink needed since package alone will dissipate enough heat satisfy these requirements. calculated value (JA)falls below these limits, heatsink required. HEATSINKING TO-220 PACKAGE PARTS TO-220 attached typical heatsink, secured copper plane board. copper plane used, values (JA) will same shown next section TO-263. manufactured heatsink selected, value heatsink-to-ambient thermal resistance, (H-A), must first calculated: (H-A) (JA) (C-H) (J-C) Where: (J-C) defined thermal resistance from junction surface case. value 3°C/W assumed (J-C) this calculation.
882206
FIGURE Limits important note that most capacitors, specified only room temperature. However, designer must ensure that will stay inside limits shown over entire operating temperature range design. aluminum electrolytic capacitors, will increase about temperature reduced from 25°C -40° This type capacitor well-suited temperature operation. Solid tantalum capacitors have more stable over temperature, more expensive than aluminum electrolytics. cost-effective approach sometimes used parallel aluminum electrolytic with solid Tantalum, with total capacitance split about 75/25% with Aluminum being larger value. capacitors paralleled, effective parallel individual values. "flatter" Tantalum will keep effective from rising quickly temperatures. HEATSINKING heatsink required depending maximum power dissipation maximum ambient temperature application. Under possible operating conditions, junction
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LM2940/LM2940C
(C-H)
defined thermal resistance between case surface heatsink. value (C-H) will vary from about 1.5°C/W about 2.5°C/W (depending method attachment, insulator, etc.). exact value unknown, 2°C/W should assumed -H).
When value (H-A) found using equation shown, heatsink must selected that value that less than equal this number. (H-A) specified numerically heatsink manufacturer catalog, shown curve that plots temperature rise power dissipation heatsink. HEATSINKING TO-263 PACKAGE PARTS TO-263 ("S") package uses copper plane itself heatsink. optimize heat sinking ability plane PCB, solder package plane. Figure shows TO-263 measured values (JA) different copper area sizes using typical with ounce copper solder mask over copper area used heatsinking.
882239
FIGURE Maximum Power Dissipation TO-263 Package HEATSINKING SOT-223 PACKAGE PARTS SOT-223 ("MP") packages copper plane itself heatsink. optimize heat sinking ability plane PCB, solder package plane. Figure Figure show information SOT-223 package. Figure assumes (JA) 74°C/W square inch ounce copper 51°C/W square inch ounce copper, with maximum ambient temperature (TA) 85°C maximum junction temperature (TJ) 125°C. techniques improving thermal resistance power dissipation SOT-223 package, please refer Application Note AN-1028.
882238
FIGURE (JA) Copper ounce) Area TO-263 Package shown figure, increasing copper area beyond square inch produces very little improvement. should also observed that minimum value (JA) TO-263 package mounted 32°C/W. design aid, Figure shows maximum allowable power dissipation compared ambient temperature TO-263 device. This assumes (JA) 35°C/W square inch ounce copper maximum junction temperature (TJ) 125°C.
882240
FIGURE (JA) Copper ounce) Area SOT-223 Package
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LM2940/LM2940C
HEATSINKING PACKAGE PARTS value package specifically dependent trace area, trace material, number layers thermal vias. recommended that minimum thermal vias placed under center improve thermal performance. techniques improving thermal resistance power dissipation package, please refer Application Note AN-1187.
882241
FIGURE Maximum Power Dissipation SOT-223 Package
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LM2940/LM2940C
Physical Dimensions inches (millimeters) unless otherwise noted
3-Lead SOT-223 Package Package Number MP04A
Lead Dual-in-Line Package Package Number J16A
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LM2940/LM2940C
Lead Surface Mount Package (WG) Package Number WG16A
3-Lead TO-220 Plastic Package Package Number TO3B
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LM2940/LM2940C
3-Lead TO-263 Surface Mount Package (MP) Package Number TS3B
8-Lead Order Number LM2940LD-5.0, LM2940LD-8.0, LM2940LD-9.0, LM2940LD-10, LM2940LD-12 LM2940LD-15 Package Number LDC08A
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LM2940/LM2940C
Notes
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LM2940/LM2940C Dropout Regulator
Notes
CONTENTS THIS DOCUMENT PROVIDED CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. NATIONAL MAKES REPRESENTATIONS WARRANTIES WITH RESPECT ACCURACY COMPLETENESS CONTENTS THIS PUBLICATION RESERVES RIGHT MAKE CHANGES SPECIFICATIONS PRODUCT DESCRIPTIONS TIME WITHOUT NOTICE. LICENSE, WHETHER EXPRESS, IMPLIED, ARISING ESTOPPEL OTHERWISE, INTELLECTUAL PROPERTY RIGHTS GRANTED THIS DOCUMENT. TESTING OTHER QUALITY CONTROLS USED EXTENT NATIONAL DEEMS NECESSARY SUPPORT NATIONAL'S PRODUCT WARRANTY. EXCEPT WHERE MANDATED GOVERNMENT REQUIREMENTS, TESTING PARAMETERS EACH PRODUCT NECESSARILY PERFORMED. NATIONAL ASSUMES LIABILITY APPLICATIONS ASSISTANCE BUYER PRODUCT DESIGN. BUYERS RESPONSIBLE THEIR PRODUCTS APPLICATIONS USING NATIONAL COMPONENTS. PRIOR USING DISTRIBUTING PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING OPERATING SAFEGUARDS. EXCEPT PROVIDED NATIONAL'S TERMS CONDITIONS SALE SUCH PRODUCTS, NATIONAL ASSUMES LIABILITY WHATSOEVER, NATIONAL DISCLAIMS EXPRESS IMPLIED WARRANTY RELATING SALE AND/OR NATIONAL PRODUCTS INCLUDING LIABILITY WARRANTIES RELATING FITNESS PARTICULAR PURPOSE, MERCHANTABILITY, INFRINGEMENT PATENT, COPYRIGHT OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS PRIOR WRITTEN APPROVAL CHIEF EXECUTIVE OFFICER GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices which intended surgical implant into body, support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user. critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness. National Semiconductor National Semiconductor logo registered trademarks National Semiconductor Corporation. other brand product names trademarks registered trademarks their respective holders.
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