LM2940/LM2940C Dropout Regulator LM2940/LM2940C positive voltage

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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 inputoutput 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
00882203
*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
Temperature Range 125°C -40°C 125°C Output Voltage LM2940CT-5.0 LM2940CS-5.0 LM2940LD-5.0 LM2940LD-8.0 LM2940CT-9.0 LM2940CS-9.0 LM2940LD-9.0 LM2940LD-10 LM2940CT-12 LM2940CS-12 LM2940LD-12 LM2940CT-15 LM2940CS-15 LM2940LD-15 Package TO-220 TO-263 Units Tape Reel 4.5k Units Tape Reel TO-220 TO-263 LM2940IMP-15 SOT-223 SOT-223 Tape Reel
LM2940LDX-5.0
LM2940LDX-8.0 LM2940LDX-9.0
LM2940LDX-10 LM2940LDX-12
LM2940LDX-15
-40°C 125°C -40°C 85°C
LM2940T-5.0 LM2940S-5.0 LM2940IMP-5.0
LM2940T-8.0 LM2940S-8.0 LM2940IMP-8.0
LM2940T-9.0 LM2940S-9.0 LM2940IMP-9.0
LM2940T-10 LM2940S-10 LM2940IMP-10
LM2940T-12 LM2940S-12 LM2940IMP-12
LM2940IMPX-5.0 LM2940IMPX-8.0 LM2940IMPX-9.0 LM2940IMPX-10 LM2940IMPX-12 LM2940IMPX-15
SOT-223 Package Marking
L53B
L54B
L0EB
L55B
L56B
L70B
physical size SOT-223 small contain full device part number. package markings indicated what will appear actual device.
2003 National Semiconductor Corporation
DS008822
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LM2940/LM2940C
Ordering Information
Temperature Range -55°C 125°C
(Continued) Output Voltage LM2940J-8.0/883 5962-9088301QEA LM2940J-12/883 5962-9088401QEA LM2940J-15/883 5962-9088501QEA J16A WG16A Package
LM2940J-5.0/883 5962-8958701EA LM2940WG5.0/883 5962-8958701XA
information military temperature range products, please Mil/Aero Site
Connection Diagrams
(TO-220) Plastic Package 3-Lead SOT-223
00882202
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 LM2940T-12 Package Number TO3B 16-Lead Dual-in-Line Package
00882242
Front View Order Part Number LM2940IMP-5.0, LM2940IMP-8.0, LM2940IMP-9.0, LM2940IMP-10, LM2940IMP-12 LM2940IMP-15 Package Number MP04A
16-Lead Ceramic Surface-Mount Package (WG)
00882243
00882244
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) Package Number J16A
View Order Number LM2940WG5.0/883 (5962-8958701XA) Package Number WG16A
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LM2940/LM2940C
Connection Diagrams
(Continued) 8-Lead
(TO-263) Surface-Mount Package
00882211
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 LM2940S-12 Package Number TS3B
00882246
View Order Number LM2940LD-5.0, LM2940LD-8.0, LM2940LD-9.0, LM2940LD-10, LM2940LD-12, LM2940LD-15 Package Number LDC08A
fused center need tied together board
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LM2940/LM2940C
Absolute Maximum Ratings
(Note
SOT-223 (MP) Package Susceptibility (Note
260°C,
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 TO-220 Package TO-263 Package Lead Temperature, Time Wave Soldering 260°C, 260°C, Internally Limited 150°C -65°C +150°C
Operating Conditions (Note
Input Voltage Temperature Range LM2940T, LM2940S LM2940CT, LM2940CS LM2940IMP LM2940J, LM2940WG LM2940LD -40°C 125°C 125°C -40°C 85°C -55°C 125°C -40°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 Output Voltage 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 Short Circuit Current (Note 0.8/1.0 150/200 0.7/1.0 150/200 1.5/1.3 0.8/1.0 150/200 0.7/1.0 150/200 1.6/1.3 1000 VMAX mVMAX AMIN 60/54 60/50 54/48 54/48 dBMIN dBMIN 700/700 1000/1000 µVrms 15/20 45/60 50/60 45/60 50/60 mAMAX 15/20 15/20 15/20 mAMAX 1000/1000 1000/1000 50/80 50/100 80/130 80/130 mVMAX 5.00 4.85/4.75 5.15/5.25 LM2940/883 Limit (Note 4.85/4.75 5.15/5.25 40/50 8.00 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 VMIN VMAX mVMAX Units
6.25V
9.4V
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LM2940/LM2940C
Electrical Characteristics
Output Voltage (VO) Parameter Maximum Line Transient Conditions LM2940,
(Continued) unless otherwise specified. Boldface limits apply over entire operating temperature range indicated device. other specifications apply 25°C. LM2940 Limit (Note 60/60 40/40 -15/-15 -50/-50 -45/-45 -45/-45 -15/-15 -15/-15 -50/-50 -45/-45 VMIN -15/-15 VMIN LM2940/883 Limit (Note LM2940 Limit (Note 60/60 40/40 LM2940/883 Limit (Note Units
LM2940/883, LM2940C, Reverse Polarity Input Voltage Reverse Polarity Transient Input Voltage LM2940, LM2940/883 LM2940C LM2940, LM2940/883, LM2940C,
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 10.5V Output Voltage 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 Dropout Voltage
LM2940 Limit (Note 11.5V 10.00 9.70/9.50 10.30/10.50 VMIN VMAX mVMAX Units
9.00
8.73/8.55 9.27/9.45
90/150
100/165
mVMAX
15/20 45/60
15/20 45/60
mAMAX mAMAX µVrms
52/46
51/45
dBMIN 1000
0.8/1.0 150/200
0.8/1.0 150/200
VMAX mVMAX
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LM2940/LM2940C
Electrical Characteristics
Output Voltage (VO) Parameter Short Circuit Current Maximum Line Transient LM2940 LM2940C Reverse Polarity Input Voltage Reverse Polarity Transient Input Voltage LM2940 LM2940C LM2940 LM2940C (Note
(Continued) unless otherwise specified. Boldface limits apply over entire operating temperature range indicated device. other specifications apply 25°C. LM2940 Conditions Limit (Note LM2940 Limit (Note AMIN Units
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 Output Voltage 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,
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LM2940/833 Limit (Note 11.64/11.40 12.36/12.60 75/120 15.00 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 VMIN VMAX mVMAX Units
13.6V 12.00 11.64/11.40 12.36/12.60
16.75V
120/200
120/190 1000/1000
150/240
mVMAX
1000/1000
15/20 45/60
15/20 50/60 1000/1000 45/60
15/20 50/60 1000/1000
mAMAX mAMAX µVrms
54/48 52/46 48/42
dBMIN dBMIN
LM2940/LM2940C
Electrical Characteristics
Output Voltage (VO) Parameter Long Term Stability Dropout Voltage Short Circuit Current Maximum Line Transient LM2940, (Note Conditions
(Continued) unless otherwise specified. Boldface limits apply over entire operating temperature range indicated device. other specifications apply 25°C. LM2940 Limit (Note 0.8/1.0 150/200 0.7/1.0 150/200 1.6/1.3 LM2940/833 Limit (Note 0.8/1.0 150/200 0.7/1.0 150/200 1.6/1.3 LM2940 Limit (Note LM2940/833 Limit (Note 1000 VMAX mVMAX AMIN Units
60/60 40/40 -15/-15 -50/-50 -45/-45 -45/-45 -45/-45 -45/-45 VMIN -15/-15 -15/-15 VMIN 40/40 VMIN
LM2940/883, LM2940C, Reverse Polarity Input Voltage Reverse Polarity Transient Input Voltage LM2940, LM2940/883 LM2940C LM2940, LM2940/883, LM2940C,
Thermal Performance
Thermal Resistance Junction-to-Case Thermal Resistance Junction-to-Ambient 3-Lead TO-220 3-Lead TO-263 3-Lead TO-220 3-Lead TO-263 8-Lead (Note °C/W °C/W °C/W °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 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
00882213
00882214
Output Voltage Temperature
Quiescent Current Temperature
00882215
00882216
Quiescent Current
Quiescent Current
00882217
00882218
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LM2940/LM2940C
Typical Performance Characteristics
Line Transient Response
(Continued) Load Transient Response
00882219
00882220
Ripple Rejection
Voltage Behavior
00882221
00882225
Voltage Behavior
Voltage Behavior
00882226
00882227
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LM2940/LM2940C
Typical Performance Characteristics
Voltage Behavior
(Continued) Voltage Behavior
00882228
00882229
Voltage Behavior
Output Voltage Extremes
00882230
00882231
Output Voltage Extremes
Output Voltage Extremes
00882232
00882233
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LM2940/LM2940C
Typical Performance Characteristics
Output Voltage Extremes
(Continued) Output Voltage Extremes
00882234
00882235
Output Voltage Extremes
Output Capacitor
00882236 00882206
Peak Output Current
Output Impedance
00882208
00882222
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LM2940/LM2940C
Typical Performance Characteristics
Maximum Power Dissipation (TO-220)
(Continued) Maximum Power Dissipation (TO-3)
00882223
00882224
Maximum Power Dissipation (TO-263) (Note
00882210
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LM2940/LM2940C
Equivalent Schematic Diagram
00882201
Application Hints
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.
Output Capacitor
00882206
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°C. 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
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LM2940/LM2940C
Application Hints
(Continued)
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. (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 (C-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 SOT-223 PACKAGE PARTS Both TO-263 ("S") SOT-223 ("MP") packages 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.
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 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:
00882237
(VIN VOUT) (VIN)
FIGURE Power Dissipation Diagram next parameter which must calculated maximum allowable temperature rise, (max). This calculated using formula: (max) TJ(max) (max) where: (max) maximum allowable junction temperature, which 125°C commercial grade parts. (max) maximum ambient temperature which will encountered application. Using calculated values TR(max) maximum allowable value junction-to-ambient thermal resistance, (JA), found: (JA) (max)/PD 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.
00882238
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 (assuming (JA) 35°C/W maximum junction temperature 125°C).
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LM2940/LM2940C
Application Hints
(Continued)
00882240
00882239
FIGURE (JA) Copper ounce) Area SOT-223 Package
FIGURE Maximum Power Dissipation TAMB TO-263 Package Figure Figure show information SOT-223 package. Figure assumes (JA) 74°C/W ounce copper 51°C/W ounce copper maximum junction temperature 125°C.
00882241
FIGURE Maximum Power Dissipation TAMB SOT-223 Package
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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 Package Number MP04A
Lead Dual-in-Line Package Order Number LM2940J-5.0/883 (5962-8958701EA), LM2940J-8.0/883 (5962-9088301QEA), LM2940J-12/883 (5962-9088401QEA), LM2940J-15/883 (5962-9088501QEA) Package Number J16A
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LM2940/LM2940C
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Lead Surface Mount Package (WG) Order Number LM2940WG5.0/883 (5962-8958701XA) Package Number WG16A
3-Lead TO-220 Plastic Package Order Number LM2940T-5.0, LM2940T-8.0, LM2940T-9.0, LM2940T-10, LM2940T-12, LM2940CT-5.0, LM2940CT-12 LM2940CT-15 Package Number TO3B
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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 LM2940CS-15 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 Dropout Regulator
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems 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.
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: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety 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 assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LM2940/LM2940C Dropout Regulator LM2940/LM2940C positive voltage

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