LM2940(-N, C) Datasheet by Texas Instruments

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LM2940-N, LM2940C
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LM2940-N/LM2940C 1A Low Dropout Regulator
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1FEATURES DESCRIPTION
The LM2940-N/LM2940C positive voltage regulator
2 Dropout Voltage Typically 0.5V @IO= 1A features the ability to source 1A of output current with
Output Current in Excess of 1A a dropout voltage of typically 0.5V and a maximum of
Output Voltage Trimmed Before Assembly 1V over the entire temperature range. Furthermore, a
quiescent current reduction circuit has been included
Reverse Battery Protection which reduces the ground current when the
Internal Short Circuit Current Limit differential between the input voltage and the output
Mirror Image Insertion Protection voltage exceeds approximately 3V. The quiescent
current with 1A of output current and an input-output
• P+Product Enhancement Tested 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-
N/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.
Typical Application
*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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
l TEXAS INSTRUMENTS mm 32.7....“ 33:5“ p mm v NC— ‘ ‘5 —le NC— 2 ‘5 —N0 vom— a u -GND NC- 4 13 -GND GND— 5 ‘2 —GND NC— a u —GND Nc— 7 m -NC NC— a 9 -NC 33mm mm END :IZICNIJ :Izwur W— m_ 14—an ouwur— NC— ‘ V I5 —V w No- 2 ‘5 _Nc our— 3 u —Nc No- 4 13 _Nc m- 5 ‘2 _GND m- 5 .. _GND Nc— 7 u) —Nc Nc— a 9 —Nc
GND
INPUT
N/C
GND
1
3
4
2
6
5
7
8
GND
N/C
VOUT
VOUT
N/C
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Connection Diagrams
Figure 1. TO-220 (NDE) Plastic Package Figure 2. SOT-223 (DCY) 3-Lead
Front View Front View
See Package Number NDE0003B See Package Number DCY0004A
Figure 3. 16-Lead CDIP (NFE) Figure 4. 16-Lead CLGA (NAC)
Top View Top View
See Package Number NFE0016A See Package Number NAC0016A
Figure 5. DDPAK/ TO-263 (KTT) Figure 6. Side View
Top View See Package Number KTT0003B
Pin 2 and pin 7 are fused to center DAP
Pin 5 and 6 need to be tied together on PCB board
Figure 7. WSON (NGN) 8-Lead
Top View
See Package Number NGN0008A
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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Absolute Maximum Ratings (1)(2)
LM2940-N KTT, NFE, NAC, NDE, DCY 100 ms 60V
LM2940C KTT, NDE 1 ms 45V
Internal Power Dissipation(3) Internally Limited
Maximum Junction Temperature 150°C
Storage Temperature Range 65°C TJ+150°C
TO-220 (NDE), Wave 260°C, 10s
DDPAK/ TO-263 (KTT) 235°C, 30s
Soldering Temperature (4)
SOT-223 (DCY) 260°C, 30s
WSON-8 (NGN) 235°C, 30s
ESD Susceptibility (5) 2 kV
(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 ensured. For ensured specifications and test conditions see the Electrical
Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal
resistance, θJA, 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 θJA (for devices in still air with no heatsink) is 60°C/W for the
TO-220 package, 80°C/W for the DDPAK/TO-263 package, and 174°C/W for the SOT-223 package. The effective value of θJA can be
reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of θJA for the WSON 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 WSON package, refer to Application Note AN-1187 (SNOA401). It is recommended that 6 vias be placed
under the center pad to improve thermal performance.
(4) Refer to JEDEC J-STD-020C for surface mount device (SMD) package reflow profiles and conditions. Unless otherwise stated, the
temperature and time are for Sn-Pb (STD) only.
(5) ESD rating is based on the human body model, 100 pF discharged through 1.5 kΩ.
Operating Conditions (1)
Input Voltage 26V
LM2940-N NDE, LM2940-N KTT 40°C TJ125°C
LM2940C NDE, LM2940C KTT 0°C TJ125°C
Temperature Range LM2940-N DCY 40°C TA85°C
LM2940-N NFE, LM2940-N NAC 55°C TJ125°C
LM2940-N NGN 40°C TJ125°C
(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 ensured. For ensured specifications and test conditions see the Electrical
Characteristics.
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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
Parameter Conditions Typ LM2940-N LM2940- Typ LM2940-N LM2940- Units
Limit(1) N/883 Limit(1) N/883
Limit(2) Limit(2)
Output Voltage 5 mA IO1A 6.25V VIN 26V 9.4V VIN 26V
5.00 4.85/4.75 4.85/4.75 8.00 7.76/7.60 7.76/7.60 VMIN
5.15/5.25 5.15/5.25 8.24/8.40 8.24/8.40 VMAX
Line Regulation VO+ 2V VIN 26V, 20 50 40/50 20 80 50/80 mVMAX
IO= 5 mA
Load Regulation 50 mA IO1A
LM2940-N, LM2940-N/883 35 50/80 50/100 55 80/130 80/130 mVMAX
LM2940C 35 50 55 80
Output Impedance 100 mADC and
20 mArms, 35 1000/1000 55 1000/1000 mΩ
fO= 120 Hz
Quiescent Current VO+2V VIN 26V,
IO= 5 mA
LM2940-N, LM2940-N/883 10 15/20 15/20 10 15/20 15/20 mAMAX
LM2940C 10 15
VIN = VO+ 5V, 30 45/60 50/60 30 45/60 50/60 mAMAX
IO= 1A
Output Noise Voltage 10 Hz 100 kHz, 150 700/700 240 1000/1000 μVrms
IO= 5 mA
Ripple Rejection fO= 120 Hz, 1 Vrms,
IO= 100 mA
LM2940-N 72 60/54 66 54/48 dBMIN
LM2940C 72 60 66 54
fO= 1 kHz, 1 Vrms, 60/50 54/48 dBMIN
IO= 5 mA
Long Term Stability 20 32 mV/
1000 Hr
Dropout Voltage 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
Short Circuit See (3) 1.9 1.6 1.5/1.3 1.9 1.6 1.6/1.3 AMIN
Current
Maximum Line RO= 100Ω
Transient LM2940-N, T 100 ms 75 60/60 75 60/60 VMIN
LM2940-N/883, T 20 ms 40/40 40/40
LM2940C, T 1 ms 55 45 55 45
Reverse Polarity RO= 100Ω
DC Input Voltage LM2940-N, LM2940-N/883 30 15/15 15/15 30 15/15 15/15 VMIN
LM2940C 30 15 30 15
(1) All limits are specified 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 specified via correlation
using standard Statistical Quality Control methods.
(2) All limits are specified 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.
(3) Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
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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
Parameter Conditions Typ LM2940-N LM2940- Typ LM2940-N LM2940- Units
Limit(1) N/883 Limit(1) N/883
Limit(2) Limit(2)
Reverse Polarity RO= 100Ω
Transient Input LM2940-N, T 100 ms 75 50/50 75 50/50 VMIN
Voltage LM2940-N/883, T 20 ms 45/45 45/45
LM2940C, T 1 ms 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) 9V 10V
LM2940-N LM2940-N Units
Parameter Conditions Typ Limit Typ Limit
(1) (1)
Output Voltage 10.5V VIN 26V 11.5V VIN 26V
5 mA IO1A 9.00 8.73/8.55 10.00 9.70/9.50 VMIN
9.27/9.45 10.30/10.50 VMAX
Line Regulation VO+ 2V VIN 26V, 20 90 20 100 mVMAX
IO= 5 mA
Load Regulation 50 mA IO1A
LM2940-N 60 90/150 65 100/165 mVMAX
LM2940C 60 90
Output Impedance 100 mADC and
20 mArms, 60 65 mΩ
fO= 120 Hz
Quiescent Current VO+2V VIN < 26V,
IO= 5 mA
LM2940-N 10 15/20 10 15/20 mAMAX
LM2940C 10 15
VIN = VO+ 5V, IO= 1A 30 45/60 30 45/60 mAMAX
Output Noise Voltage 10 Hz 100 kHz, 270 300 μVrms
IO= 5 mA
Ripple Rejection fO= 120 Hz, 1 Vrms,
IO= 100 mA
LM2940-N 64 52/46 63 51/45 dBMIN
LM2940C 64 52
Long Term 34 36 mV/
Stability 1000 Hr
Dropout Voltage 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
Short Circuit Current See (2) 1.9 1.6 1.9 1.6 AMIN
(1) All limits are specified 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 specified via correlation
using standard Statistical Quality Control methods.
(2) Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
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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-N LM2940-N Units
Parameter Conditions Typ Limit Typ Limit
(1) (1)
Maximum Line Transient RO= 100Ω
T100 ms
LM2940-N 75 60/60 75 60/60 VMIN
LM2940C 55 45
Reverse Polarity RO= 100Ω
DC Input Voltage LM2940-N 30 15/15 30 15/15 VMIN
LM2940C 30 15
Reverse Polarity RO= 100Ω
Transient Input Voltage T100 ms
LM2940-N 75 50/50 75 50/50 VMIN
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 15V
Parameter Conditions Typ LM2940-N LM2940- Typ LM2940-N LM2940- Units
Limit (1) N/833 Limit (1) N/833
Limit (2) Limit (2)
Output Voltage 13.6V VIN 26V 16.75V VIN 26V
5 mA IO1A 12.0 11.64/11.40 11.64/11.40 15.0 14.55/14.25 14.55/14.25 VMIN
0 0
12.36/12.60 12.36/12.60 15.45/15.75 15.45/15.75 VMAX
Line Regulation VO+ 2V VIN 26V, 20 120 75/120 20 150 95/150 mVMAX
IO= 5 mA
Load Regulation 50 mA IO1A
LM2940-N, LM2940-N/883 55 120/200 120/190 150/240 mVMAX
LM2940C 55 120 70 150
Output Impedance 100 mADC and
20 mArms, 80 1000/1000 100 1000/1000 mΩ
fO= 120 Hz
Quiescent VO+2V VIN 26V,
Current IO= 5 mA
LM2940-N, LM2940-N/883 10 15/20 15/20 15/20 mAMAX
LM2940C 10 15 10 15
VIN = VO+ 5V, IO= 1A 30 45/60 50/60 30 45/60 50/60 mAMAX
Output Noise 10 Hz 100 kHz, 360 1000/1000 450 1000/1000 μVrms
Voltage IO= 5 mA
(1) All limits are specified 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 specified via correlation
using standard Statistical Quality Control methods.
(2) All limits are specified 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.
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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 15V
Parameter Conditions Typ LM2940-N LM2940- Typ LM2940-N LM2940- Units
Limit (1) N/833 Limit (1) N/833
Limit (2) Limit (2)
Ripple Rejection fO= 120 Hz, 1 Vrms,
IO= 100 mA
LM2940-N 66 54/48 dBMIN
LM2940C 66 54 64 52
fO= 1 kHz, 1 Vrms, dBMIN
52/46 48/42
IO= 5 mA
Long Term Stability mV/
48 60 1000 Hr
Dropout Voltage 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
Short Circuit Current See (3) 1.9 1.6 1.6/1.3 1.9 1.6 1.6/1.3 AMIN
Maximum Line RO= 100Ω
Transient LM2940-N, T 100 ms 75 60/60
LM2940-N/883, T 20 ms 40/40 40/40 VMIN
LM2940C, T 1 ms 55 45 55 45
Reverse Polarity RO= 100Ω
DC Input Voltage LM2940-N, LM2940-N/883 30 15/15 15/15 15/15 VMIN
LM2940C 30 15 30 15
Reverse Polarity RO= 100Ω
Transient Input LM2940-N, T 100 ms 75 50/50
Voltage LM2940-N/883, T 20 ms 45/45 45/45 VMIN
LM2940C, T 1 ms 55 45/45 55 45/45
(3) Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
Thermal Performance
3-Lead TO-220 4
Thermal Resistance °C/W
Junction-to-Case, θ(JC) 3-Lead DDPAK/TO-263 4
3-Lead TO-220 (1) 60
3-Lead DDPAK/TO-263 (1) 80
Thermal Resistance °C/W
Junction-to-Ambient, θ(JA) SOT-223(1) 174
8-Lead WSON (1) 35
(1) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal
resistance, θJA, 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 θJA (for devices in still air with no heatsink) is 60°C/W for the
TO-220 package, 80°C/W for the DDPAK/TO-263 package, and 174°C/W for the SOT-223 package. The effective value of θJA can be
reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of θJA for the WSON 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 WSON package, refer to Application Note AN-1187 (SNOA401). It is recommended that 6 vias be placed
under the center pad to improve thermal performance.
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l TEXAS INSTRUMENTS TN PUT-OUTPUT DTFFERENTTAL (v) OUTPUT VOLTAGE (5v) OUTESCENT CURRENT (mA) 0 200 A00 600 500 T000 OUTPUT CURRENT (mA) 5.T0 5,03 5.06 5.04 5 02 5.00 ms t as A.9A A.92 A30 740 0 T0 00 T20 T60 TEMPERATURE (°c) 200 T80 T60 HO T20 T00 50 60 A0 20 05TOT520253035 TNPUT VOLTAGE (v) 0ROPDUT VOLTAGE (v) OUTESCENT CURRENT (mA) OUTESCENT CURRENT (mA) 740 0 T0 00 T20 T60 TEMPERATURE (°c) 740 0 T0 00 T20 T60 TEMPERATURE (°c) 0 02 0.4 0.6 00 T.0 LOAD CURRENT (A)
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Typical Performance Characteristics
Dropout Voltage
vs.
Dropout Voltage Temperature
Figure 8. Figure 9.
Output Voltage Quiescent Current
vs. vs.
Temperature Temperature
Figure 10. Figure 11.
Quiescent Current Quiescent Current
Figure 12. Figure 13.
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Typical Performance Characteristics (continued)
Line Transient Response Load Transient Response
Figure 14. Figure 15.
Ripple Rejection Low Voltage Behavior
Figure 16. Figure 17.
Low Voltage Behavior Low Voltage Behavior
Figure 18. Figure 19.
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l TEXAS INSTRUMENTS OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) IS TO = TA I5 TJ=25°C V0 = 10V I2 9 E 3 a o a e 9 T2 T5 Ta TNPUT VOLTAGE (V) IS TO = TA I5 TJ 25°C V0 = ISV I2 9 E 3 a o a e 9 T2 T5 Ta TNPUT VOLTAGE (V) 20 I ‘6 Tom 0:8V ‘2 E A // o 74 730 72a 7m 0 To 20 so To TNPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) M : TA T2 TJ = 25°C Va = T2V TO 0 7 ‘ 6 8 10 T2 H TNPUT VOLTAGE (V) 730 720 40 0 TO 20 so 40 TNPUT VOLTAGE (V) o / 730 720710 0 TO 20 30 Au TNPUT VOLTAGE (V)
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Typical Performance Characteristics (continued)
Low Voltage Behavior Low Voltage Behavior
Figure 20. Figure 21.
Low Voltage Behavior Output at Voltage Extremes
Figure 22. Figure 23.
Output at Voltage Extremes Output at Voltage Extremes
Figure 24. Figure 25.
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l TEXAS INSTRUMENTS 25 ‘ I 20 ‘ I 20 R = Tom ‘6 R = Tmm A VO : TOV ; v0 : m m ‘5 m ‘2 :3 :3 3 3 6 TO 6 a > > / E 5 E A a a / o o 74 O 720 7m 0 To 20 so 40 730 720 7m 0 To 20 so 40 TNPUT VOLTAGE (V) TNPUT VOLTAGE (V) 25 ,L TOO T | 5 20 RL : T0011 8 ; z 3 V0 15V 5 ‘0 u T5 % u E. g k a To a I > E g 3 STABLE fl 5 ._ REGION 3 z a 5 O.T 0 5 E 0.0T 730 ’20 ,m 0 TD 20 30 40 O 200 Am sou T300 1000 TNPUT VOLTAGE (V) OUTPUT CURRENT (mA) 3.0 TOOO 500 A 8 2,00 4 V 7 AV V V N ._ 2.0 \ g TOO 5 ~ g E a 0.50 3 LL 0 2 0,20 E To g OTO 5 A o 3 nos 0,02 0 OOT an o m so T20 T50 T TO T00 Ik TDk TOOL TM TEMPERATURE (°C) EREOUENGV (Hz)
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Typical Performance Characteristics (continued)
Output at Voltage Extremes Output at Voltage Extremes
Figure 26. Figure 27.
Output at Voltage Extremes Output Capacitor ESR
Figure 28. Figure 29.
Peak Output Current Output Impedance
Figure 30. Figure 31.
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l TEXAS INSTRUMENTS 30 \NHN‘TE HEAT S‘NK SOT7223 PACKAGE ‘ 131) ‘NCH OF COPPER n g 25 5 E z o ZOUNCE COPPER E E 2° / eu=51°clw , 4 E .% \ v) (I: 15 fl _ \ a ‘0“C/W HEAT SINK 2 \ E E 10 \ E E 1OUNCE COPPER \\ N0 HEAT SW 05 eJA:74“C/W W x w | w w 0 ‘0 20 so w 50 60 70 50 so me e 1e 20 30 40 50 so 70 an 90100 AMBIENT TEMPERATURE TA (Dc) AMB‘ENT TEMPERATURE (°C) aware/w I 3 0M:37°C/w : souc/w Pawn? msswwoN (w) a” : 73°c/w 0 0 10 20 SD 40 so 60 70 an 90100 AW [NT TEMPERATURE (°C)
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Typical Performance Characteristics (continued)
Maximum Power Dissipation (TO-220) Maximum Power Dissipation (SOT-223)
Figure 32. Figure 33.
Maximum Power Dissipation (DDPAK/TO-263)
Figure 34.
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Equivalent Schematic Diagram
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APPLICATION INFORMATION
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:
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.
Figure 35. Output Capacitor 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
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:
14 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2940-N LM2940C
l TEXAS INSTRUMENTS Vqu ow H LOAD
LM2940-N, LM2940C
www.ti.com
SNVS769I MARCH 2000REVISED APRIL 2013
IIN = IL+ IG
PD= (VIN VOUT) IL+ (VIN) IG
Figure 36. 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 125°C for commercial grade parts.
• TA(MAX)is the maximum ambient temperature which will be encountered in the application. (1)
Using the calculated values for TR(MAX) and PD, the maximum allowable value for the junction-to-ambient thermal
resistance, θ(JA), can now be found:
θ(JA) = TR(MAX) / PD(2)
NOTE
If the maximum allowable value for θ(JA) is found to be 53°C/W for the TO-220 package,
80°C/W for the DDPAK/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 θ(JA)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 θ(JA) will be the same as shown in the next section for the DDPAK/TO-263.
If a manufactured heatsink is to be selected, the value of heatsink-to-ambient thermal resistance, θ(HA), must
first be calculated:
θ(HA) =θ(JA) − θ(CH) − θ(JC)
where
θ(JC) 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 θ(JC) for this calculation.
θ(CH) is defined as the thermal resistance between the case and the surface of the heatsink. The value
of θ(CH) 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 θ(CH). (3)
When a value for θ(HA) is found using the equation shown, a heatsink must be selected that has a value that is
less than or equal to this number.
θ(HA) 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 DDPAK/TO-263 PACKAGE PARTS
The DDPAK/TO-263 (KTT) package uses 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 37 shows for the DDPAK/TO-263 the measured values of θ(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.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: LM2940-N LM2940C
l TEXAS INSTRUMENTS 4n) w EC/w so w POWER msswmoN w) an so m m; 30 n v z 3 town? m mm (50 w) 5 \\| 1 OUNCE COPPER s“ : 35"ch — 107253 PACKAGE PCEMOUNTED 15:] INCH COPPER .5o .25 u 25 50 75 100125 AME‘ENT YEMPERAYURE. TA 1°C}
LM2940-N, LM2940C
SNVS769I MARCH 2000REVISED APRIL 2013
www.ti.com
Figure 37. θ(JA) vs. Copper (1 ounce) Area for the DDPAK/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 θ(JA) for the DDPAK/TO-263 package mounted to a PCB is
32°C/W.
As a design aid, Figure 38 shows the maximum allowable power dissipation compared to ambient temperature
for the DDPAK/TO-263 device. This assumes a θ(JA) of 35°C/W for 1 square inch of 1 ounce copper and a
maximum junction temperature (TJ) of 125°C.
Figure 38. Maximum Power Dissipation vs. TAfor the DDPAK/TO-263 Package
HEATSINKING SOT-223 PACKAGE PARTS
The SOT-223 (DCY) 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 39 and Figure 40 show the information for the SOT-223 package. Figure 40 assumes a θ(JA) of 74°C/W
for 1 square inch of 1 ounce copper and 51°C/W for 1 square inch of 2 ounce copper, with a maximum ambient
temperature (TA) of 85°C and a maximum junction temperature (TJ) of 125°C.
For techniques for improving the thermal resistance and power dissipation for the SOT-223 package, please
refer to Application Note AN-1028 (SNVA036).
16 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2940-N LM2940C
l TEXAS INSTRUMENTS no no Mum stwsrwc: NH) w “c/w u ‘ 2 3 mm YEHL AREA (50 m) 5 sorzza PACKAGE A PCB MOUNTED‘ g 4 15a INCH COPPER z 9 '3 a g ZOUNCE co PER w e =51“c/w 6 2 r u 5 a5“c g \ o a 1 1 sum; COPPER 61A = 7mm 0 ‘ ‘ ‘ .5o -25 u 25 5o 75 100125 AME‘ENT YEMPERAYURE. TA (“0)
LM2940-N, LM2940C
www.ti.com
SNVS769I MARCH 2000REVISED APRIL 2013
Figure 39. θ(JA) vs. Copper (2 ounce) Area for the SOT-223 Package
Figure 40. Maximum Power Dissipation vs. TAfor the SOT-223 Package
HEATSINKING WSON PACKAGE PARTS
The value of θJA for the WSON package is specifically dependent on PCB trace area, trace material, and the
number of layers and thermal vias. It is recommended that a minimum of 6 thermal vias be placed under the
center pad to improve thermal performance.
For techniques for improving the thermal resistance and power dissipation for the WSON package, please refer
to Application Note AN-1187 (SNOA401).
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 17
Product Folder Links: LM2940-N LM2940C
l TEXAS INSTRUMENTS
LM2940-N, LM2940C
SNVS769I MARCH 2000REVISED APRIL 2013
www.ti.com
REVISION HISTORY
Changes from Revision H (April 2013) to Revision I Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 17
18 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2940-N LM2940C
I TEXAS INSTRUMENTS Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples
PACKAGE OPTION ADDENDUM
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Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2940CS-12 ACTIVE DDPAK/
TO-263
KTT 3 45 TBD Call TI Call TI 0 to 125 LM2940CS
-12 P+
LM2940CS-12/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-12 P+
LM2940CS-15 ACTIVE DDPAK/
TO-263
KTT 3 45 TBD Call TI Call TI 0 to 125 LM2940CS
-15 P+
LM2940CS-15/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-15 P+
LM2940CS-5.0 ACTIVE DDPAK/
TO-263
KTT 3 45 TBD Call TI Call TI 0 to 125 LM2940CS
-5.0 P+
LM2940CS-5.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-5.0 P+
LM2940CS-9.0 ACTIVE DDPAK/
TO-263
KTT 3 TBD Call TI Call TI 0 to 125 LM2940CS
-9.0 P+
LM2940CS-9.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-9.0 P+
LM2940CSX-12 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI 0 to 125 LM2940CS
-12 P+
LM2940CSX-12/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-12 P+
LM2940CSX-15 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI 0 to 125 LM2940CS
-15 P+
LM2940CSX-15/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-15 P+
LM2940CSX-5.0 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI 0 to 125 LM2940CS
-5.0 P+
LM2940CSX-5.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-5.0 P+
LM2940CSX-9.0 ACTIVE DDPAK/
TO-263
KTT 3 TBD Call TI Call TI 0 to 125 LM2940CS
-9.0 P+
LM2940CSX-9.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR 0 to 125 LM2940CS
-9.0 P+
LM2940CT-12 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM2940CT
-12 P+
I TEXAS INSTRUMENTS Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples
PACKAGE OPTION ADDENDUM
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Addendum-Page 2
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2940CT-12/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM 0 to 125 LM2940CT
-12 P+
LM2940CT-15 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM2940CT
-15 P+
LM2940CT-15/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM 0 to 125 LM2940CT
-15 P+
LM2940CT-5.0 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM2940CT
-5.0 P+
LM2940CT-5.0/LF01 ACTIVE TO-220 NDG 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR LM2940CT
-5.0 P+
LM2940CT-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM 0 to 125 LM2940CT
-5.0 P+
LM2940CT-9.0 ACTIVE TO-220 NDE 3 TBD Call TI Call TI 0 to 125 LM2940CT
-9.0 P+
LM2940CT-9.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM 0 to 125 LM2940CT
-9.0 P+
LM2940IMP-10 ACTIVE SOT-223 DCY 4 1000 TBD Call TI Call TI -40 to 85 L55B
LM2940IMP-10/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L55B
LM2940IMP-12 ACTIVE SOT-223 DCY 4 1000 TBD Call TI Call TI -40 to 85 L56B
LM2940IMP-12/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L56B
LM2940IMP-15 ACTIVE SOT-223 DCY 4 1000 TBD Call TI Call TI -40 to 85 L70B
LM2940IMP-15/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L70B
LM2940IMP-5.0 ACTIVE SOT-223 DCY 4 1000 TBD Call TI Call TI -40 to 85 L53B
LM2940IMP-5.0/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L53B
LM2940IMP-9.0 ACTIVE SOT-223 DCY 4 TBD Call TI Call TI -40 to 85 L0EB
LM2940IMP-9.0/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L0EB
LM2940IMPX-10 ACTIVE SOT-223 DCY 4 TBD Call TI Call TI -40 to 85 L55B
I TEXAS INSTRUMENTS Samples Samples Samples Samples Samples Samples Samples Samples Samples Sample: Sample: Samples Samples Samples Samples Samples Samples Samples Samples
PACKAGE OPTION ADDENDUM
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Addendum-Page 3
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2940IMPX-10/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L55B
LM2940IMPX-12 ACTIVE SOT-223 DCY 4 TBD Call TI Call TI -40 to 85 L56B
LM2940IMPX-12/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L56B
LM2940IMPX-5.0 ACTIVE SOT-223 DCY 4 2000 TBD Call TI Call TI -40 to 85 L53B
LM2940IMPX-5.0/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L53B
LM2940IMPX-8.0 ACTIVE SOT-223 DCY 4 TBD Call TI Call TI -40 to 85 L54B
LM2940IMPX-8.0/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS
& no Sb/Br)
CU SN Level-1-260C-UNLIM -40 to 85 L54B
LM2940LD-12 ACTIVE WSON NGN 8 1000 TBD Call TI Call TI -40 to 125 L00018B
LM2940LD-12/NOPB ACTIVE WSON NGN 8 1000 Green (RoHS
& no Sb/Br)
CU SN Level-3-260C-168 HR -40 to 125 L00018B
LM2940LD-5.0 ACTIVE WSON NGN 8 1000 TBD Call TI Call TI -40 to 125 L00014B
LM2940LD-5.0/NOPB ACTIVE WSON NGN 8 1000 Green (RoHS
& no Sb/Br)
CU SN Level-3-260C-168 HR -40 to 125 L00014B
LM2940S-10 ACTIVE DDPAK/
TO-263
KTT 3 45 TBD Call TI Call TI -40 to 125 LM2940S
-10 P+
LM2940S-10/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-10 P+
LM2940S-12 ACTIVE DDPAK/
TO-263
KTT 3 45 TBD Call TI Call TI -40 to 125 LM2940S
-12 P+
LM2940S-12/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-12 P+
LM2940S-5.0 ACTIVE DDPAK/
TO-263
KTT 3 45 TBD Call TI Call TI -40 to 125 LM2940S
-5.0 P+
LM2940S-5.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-5.0 P+
LM2940S-8.0 ACTIVE DDPAK/
TO-263
KTT 3 TBD Call TI Call TI -40 to 125 LM2940S
-8.0 P+
LM2940S-8.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-8.0 P+
I TEXAS INSTRUMENTS Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples Samples
PACKAGE OPTION ADDENDUM
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Addendum-Page 4
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2940S-9.0 ACTIVE DDPAK/
TO-263
KTT 3 TBD Call TI Call TI -40 to 125 LM2940S
-9.0 P+
LM2940S-9.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 45 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-9.0 P+
LM2940SX-10 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S
-10 P+
LM2940SX-10/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-10 P+
LM2940SX-12 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S
-12 P+
LM2940SX-12/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-12 P+
LM2940SX-5.0 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S
-5.0 P+
LM2940SX-5.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-5.0 P+
LM2940SX-8.0 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S
-8.0 P+
LM2940SX-8.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-8.0 P+
LM2940SX-9.0 ACTIVE DDPAK/
TO-263
KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S
-9.0 P+
LM2940SX-9.0/NOPB ACTIVE DDPAK/
TO-263
KTT 3 500 Pb-Free (RoHS
Exempt)
CU SN Level-3-245C-168 HR -40 to 125 LM2940S
-9.0 P+
LM2940T-10.0 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T
10.0 P+
LM2940T-10.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM -40 to 125 LM2940T
10.0 P+
LM2940T-12.0 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T
12.0 P+
LM2940T-12.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM -40 to 125 LM2940T
12.0 P+
LM2940T-5.0 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T
-5.0 P+
LM2940T-5.0/LF08 ACTIVE TO-220 NEB 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-3-245C-168 HR LM2940T
-5.0 P+
I TEXAS INSTRUMENTS Samples Samples Samples Samples Samples
PACKAGE OPTION ADDENDUM
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Addendum-Page 5
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2940T-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM -40 to 125 LM2940T
-5.0 P+
LM2940T-8.0 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T
-8.0 P+
LM2940T-8.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM -40 to 125 LM2940T
-8.0 P+
LM2940T-9.0 ACTIVE TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T
-9.0 P+
LM2940T-9.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br)
CU SN Level-1-NA-UNLIM -40 to 125 LM2940T
-9.0 P+
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
PACKAGE OPTION ADDENDUM
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Addendum-Page 6
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
I TEXAS INSTRUMENTS REEL DIMENSIONS TAPE DIMENSIONS 7 “K0 '«Pt» Reel Dlameter AD Dimension destgned to accommodate the component wmth at) Dimension destgned to accommodate the component tengtn K0 Dtmenston destgned to accommodate the component thickness 7 w Ovevau with at the earner tape i Pt Pttch between successtve cavtty centers f T Reel Width (wt) QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE C) O O D C) O D O iSDrOcketHutes —> User Dtrecllnn 0' Feed \1/ Pockel Quadrams
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM2940CSX-12 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940CSX-12/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940CSX-15 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940CSX-15/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940CSX-5.0 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940CSX-5.0/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940CSX-9.0/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940IMP-10 SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-10/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-12 SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-12/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-15 SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-15/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 23-Sep-2013
Pack Materials-Page 1
I TEXAS INSTRUMENTS
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM2940IMP-5.0 SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-5.0/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMP-9.0/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMPX-10/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMPX-12/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMPX-5.0 SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMPX-5.0/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940IMPX-8.0/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3
LM2940LD-12 WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM2940LD-12/NOPB WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM2940LD-5.0 WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM2940LD-5.0/NOPB WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LM2940SX-10 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-10/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-12 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-12/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-5.0 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-5.0/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-8.0 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-8.0/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-9.0 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2940SX-9.0/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
PACKAGE MATERIALS INFORMATION
www.ti.com 23-Sep-2013
Pack Materials-Page 2
I TEXAS INSTRUMENTS TAPE AND REEL BOX DIMENSIONS
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2940CSX-12 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940CSX-12/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940CSX-15 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940CSX-15/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940CSX-5.0 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940CSX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940CSX-9.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940IMP-10 SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-10/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-12 SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-12/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-15 SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-15/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-5.0 SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-5.0/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMP-9.0/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0
LM2940IMPX-10/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0
LM2940IMPX-12/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0
LM2940IMPX-5.0 SOT-223 DCY 4 2000 367.0 367.0 35.0
LM2940IMPX-5.0/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 23-Sep-2013
Pack Materials-Page 3
I TEXAS INSTRUMENTS
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2940IMPX-8.0/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0
LM2940LD-12 WSON NGN 8 1000 210.0 185.0 35.0
LM2940LD-12/NOPB WSON NGN 8 1000 213.0 191.0 55.0
LM2940LD-5.0 WSON NGN 8 1000 210.0 185.0 35.0
LM2940LD-5.0/NOPB WSON NGN 8 1000 213.0 191.0 55.0
LM2940SX-10 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-10/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-12 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-12/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-5.0 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-8.0 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-8.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-9.0 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2940SX-9.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
PACKAGE MATERIALS INFORMATION
www.ti.com 23-Sep-2013
Pack Materials-Page 4
4» 0.2.4070150 + man-0.350 + [mo-6.50] [ass-8,89] woo-0.120 fl 0449-0455 [2-5‘1-05] /' [5.754.591 mms :22: 2;? 0-400 »a.oos _ > _ _ _ _ 1 0190—0 210 [1046 3ng [4. [3315. 33] / omaimss l mun-0.150 W [Lu-1.40] Pm #1 ID [5.30-4.05] TVF «0054.035 0.02770057 [25.53-26.29] [039-034] w 7° \ / 704 ( o.525-o.555 )fi, 0. m5 133$: [0.33132] [Int—tun] mus—0.135 _ [us-us] f f o. o T o 5 \‘l i on. am .a 25 mow-0.052 7 ° ‘°5 0-0‘5 [Z 67 0-39 [Ln—"52] SEATING PLANE TAPERED SIDES ‘0 1033 (REV l) ' TEXAS INSTRUMENTS
MECHANICAL DATA
NDE0003B
www.ti.com
: C10 640 MAX 9:0 25! [1526] m 130: Big T A00, W, I? 5440 x51 met “,3 1c 1513 .33] i" [b (Jun 251 1 , ass L 4 M1 \D 1 39] 151: 002 340: 0,0 3x as" on: (3 54:2 C5] [5 64:0 251 [C (7121 250: an [6 Zb‘U 25‘ 335‘ C‘D [a am 251 055: 010 I H A‘C 751 153: 005 zaps: 23g Ax \ns 4 3H017‘ ’ ~0 25 i k 0 64 n w] 5 9 J J j [7 01 0D, V n a [1 27:0 (75' "ASN.5 “ 5 “" 015135; LL L03 4 V V ‘01 gammy ”LANE 015' ‘7” 7° 38 0 0:] CONTROLLING DIMENSION IS INCH VALUES IN [ ]ARE MILLIMETERS D‘MUS‘ONS \N i 2 FOR REFE? NCE ONLV ' TEXAS INSTRUMENTS
MECHANICAL DATA
NDG0003F
www.ti.com
T03F (Rev B)
T L , 2,30 (0.09l) ‘ LE4 1,80 (0.071) MAXi 0,02 (0.0003) I 77 J i Sealing Plane 0.10(0.0040) Q 0.0a(0.o03) Gauge Plan ‘ 2 3 T J LW 0°40» 0,66 (0.026) E’f' 1.70 (0.051) 1.50 (0.050) *5 TEXAS INSTRUMENTS p057 OFFICE aox 555303 - DALLAS IEXAS 75255
MECHANICAL DATA
MPDS094A – APRIL 2001 – REVISED JUNE 2002
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
DCY (R-PDSO-G4) PLASTIC SMALL-OUTLINE
4202506/B 06/2002
6,30 (0.248)
6,70 (0.264)
2,90 (0.114)
3,10 (0.122)
6,70 (0.264)
7,30 (0.287) 3,70 (0.146)
3,30 (0.130)
0,02 (0.0008)
0,10 (0.0040)
1,50 (0.059)
1,70 (0.067)
0,23 (0.009)
0,35 (0.014)
1 2 3
4
0,66 (0.026)
0,84 (0.033)
1,80 (0.071) MAX
Seating Plane
0°–10°
Gauge Plane
0,75 (0.030) MIN
0,25 (0.010)
0,08 (0.003)
0,10 (0.004) M
2,30 (0.091)
4,60 (0.181) M
0,10 (0.004)
NOTES: A. All linear dimensions are in millimeters (inches).
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion.
D. Falls within JEDEC TO-261 Variation AA.
DIMENSIONS AR w wmm: m ‘ RECOMMENDED LAND PATTERN < w=""> w w w: 3: m ‘LDS 7 \Y um :n , garaxgyr ' TEXAS INSTRUMENTS
MECHANICAL DATA
NGN0008A
www.ti.com
LDC08A (Rev B)
m- . m ‘» m ma , / uwn PATTERN IECOMMKNDATION 7 m a» mNrkoLuNc DIMENSION IS mm vuuzsmlmmm METERS n wwm u x ‘m? w Mn aw BOTTOM 5on or PACKAGE TEXAS INSTRUMENTS Wm cum
MECHANICAL DATA
KTT0003B
www.ti.com
BOTTOM SIDE OF PACKAGE
TS3B (Rev F)
HC‘ 010 540 MAX '2 7910 25] [15 26] ’ L 5 103: o , T 409‘ in: 77,77 73““) 23‘ 203; 013 .o 35 re sate 2:1 [13167012] T i a 3x 0L8 055‘ L J m L 21a 39. 151: 232 54c; 31c 3x c37+ “’7' 13 34:3 U5 3 64‘3 751 LC sun ,2} D334 mo 0 sun 15} > 055: 0:0 [14:025] :50 005 a u 5M0 w 4 , 5 ‘32: ‘ [267 a 33 D50‘ no; J , 3.7 n 27LU 051 smLs1 315‘ gm mum P AM R 325. 8‘“: [o 38:: H] y - , w 2) ” HEM”, A,LLD> CONTROLLING DIMENSION IS INCH VALUES |N[ ]ARE MILLIMETERS D\M[\S\0NS M l ) FCR HFERENCE ONLY ' TEXAS INSTRUMENTS
MECHANICAL DATA
NEB0003G
www.ti.com
TA03G (Rev A)
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Copyright © 2013, Texas Instruments Incorporated

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