LM2940-N, LM2940C
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LM2940-N/LM2940C 1A Low Dropout Regulator
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FEATURES
DESCRIPTION
•
•
•
•
•
•
•
The LM2940-N/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).
1
2
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
Designed also for vehicular applications, the LM2940N/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
2
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated
LM2940-N, LM2940C
SNVS769I – MARCH 2000 – REVISED APRIL 2013
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Connection Diagrams
Figure 1. TO-220 (NDE) Plastic Package
Front View
See Package Number NDE0003B
Figure 2. SOT-223 (DCY) 3-Lead
Front View
See Package Number DCY0004A
Figure 3. 16-Lead CDIP (NFE)
Top View
See Package Number NFE0016A
Figure 4. 16-Lead CLGA (NAC)
Top View
See Package Number NAC0016A
Figure 5. DDPAK/ TO-263 (KTT)
Top View
Figure 6. Side View
See Package Number KTT0003B
N/C
1
GND
2
8
N/C
7
GND
GND
INPUT
3
6
VOUT
N/C
4
5
VOUT
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.
2
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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
−65°C ≤ TJ ≤ +150°C
Storage Temperature Range
Soldering Temperature
ESD Susceptibility
(1)
(2)
(3)
(4)
(5)
(4)
TO-220 (NDE), Wave
260°C, 10s
DDPAK/ TO-263 (KTT)
235°C, 30s
SOT-223 (DCY)
260°C, 30s
WSON-8 (NGN)
235°C, 30s
(5)
2 kV
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.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
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.
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.
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
LM2940C NDE, LM2940C KTT
Temperature Range
(1)
LM2940-N DCY
−40°C ≤ TJ ≤ 125°C
0°C ≤ TJ ≤ 125°C
−40°C ≤ TA ≤ 85°C
LM2940-N NFE, LM2940-N NAC
−55°C ≤ TJ ≤ 125°C
LM2940-N NGN
−40°C ≤ TJ ≤ 125°C
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)
Parameter
Output Voltage
5V
Conditions
Typ
5 mA ≤ IO ≤ 1A
8V
LM2940N/883
Limit (2)
Typ
LM2940-N
Limit (1)
8.00
7.76/7.60
7.76/7.60
VMIN
8.24/8.40
8.24/8.40
VMAX
6.25V ≤ VIN ≤ 26V
5.00
LM2940N/883
Limit (2)
Units
9.4V ≤ VIN ≤ 26V
4.85/4.75
4.85/4.75
5.15/5.25
5.15/5.25
20
50
40/50
20
80
50/80
mVMAX
LM2940-N, LM2940-N/883
35
50/80
50/100
55
80/130
80/130
mVMAX
LM2940C
35
50
55
80
1000/1000
mΩ
Line Regulation
VO + 2V ≤ VIN ≤ 26V,
IO = 5 mA
Load Regulation
50 mA ≤ IO ≤ 1A
Output Impedance
LM2940-N
Limit (1)
100 mADC and
20 mArms,
35
1000/1000
55
15/20
10
15/20
15/20
mAMAX
50/60
30
45/60
50/60
mAMAX
700/700
240
1000/1000
μVrms
fO = 120 Hz
Quiescent Current
VO +2V ≤ VIN ≤ 26V,
IO = 5 mA
LM2940-N, LM2940-N/883
10
15/20
LM2940C
10
15
VIN = VO + 5V,
30
45/60
IO = 1A
Output Noise Voltage 10 Hz − 100 kHz,
150
IO = 5 mA
Ripple Rejection
fO = 120 Hz, 1 Vrms,
IO = 100 mA
LM2940-N
72
60/54
LM2940C
72
60
fO = 1 kHz, 1 Vrms,
66
54/48
66
54
60/50
dBMIN
54/48
dBMIN
IO = 5 mA
Long Term 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
1.9
1.6
1.5/1.3
1.9
1.6
1.6/1.3
AMIN
75
60/60
75
60/60
(3)
Short Circuit
Current
See
Maximum Line
Transient
RO = 100Ω
LM2940-N, T ≤ 100 ms
LM2940-N/883, T ≤ 20 ms
LM2940C, T ≤ 1 ms
Reverse Polarity
DC Input Voltage
(1)
(2)
(3)
4
40/40
55
45
LM2940-N, LM2940-N/883
−30
−15/−15
LM2940C
−30
−15
40/40
55
45
−30
−15/−15
−30
−15
VMIN
RO = 100Ω
−15/−15
−15/−15
VMIN
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.
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.
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)
Parameter
5V
Conditions
Reverse Polarity
Transient Input
Voltage
Typ
LM2940-N
Limit (1)
−75
−50/−50
−55
−45/−45
8V
LM2940N/883
Limit (2)
Typ
LM2940-N
Limit (1)
−75
−50/−50
LM2940N/883
Limit (2)
Units
RO = 100Ω
LM2940-N, T ≤ 100 ms
LM2940-N/883, T ≤ 20 ms
LM2940C, T ≤ 1 ms
VMIN
−45/−45
−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
Parameter
Conditions
Typ
Limit
LM2940-N
Typ
(1)
5 mA ≤ IO ≤1A
9.00
8.73/8.55
11.5V ≤ VIN ≤ 26V
10.00
9.27/9.45
Line Regulation
VO + 2V ≤ VIN ≤ 26V,
Units
(1)
10.5V ≤ VIN ≤ 26V
Output Voltage
Limit
9.70/9.50
VMIN
10.30/10.50
VMAX
20
90
20
100
mVMAX
LM2940-N
60
90/150
65
100/165
mVMAX
LM2940C
60
90
IO = 5 mA
Load Regulation
Output Impedance
50 mA ≤ IO ≤ 1A
100 mADC and
20 mArms,
60
65
mΩ
fO = 120 Hz
Quiescent Current
VO +2V ≤ VIN < 26V,
IO = 5 mA
Output Noise Voltage
LM2940-N
10
15/20
LM2940C
10
15
VIN = VO + 5V, IO = 1A
30
45/60
10 Hz − 100 kHz,
270
10
15/20
mAMAX
30
45/60
mAMAX
μVrms
300
IO = 5 mA
Ripple Rejection
fO = 120 Hz, 1 Vrms,
IO = 100 mA
LM2940-N
64
52/46
LM2940C
64
52
Long Term
Stability
Dropout Voltage
Short Circuit Current
(1)
(2)
34
63
51/45
36
dBMIN
mV/
1000 Hr
IO = 1A
0.5
0.8/1.0
0.5
0.8/1.0
VMAX
IO = 100 mA
110
150/200
110
150/200
mVMAX
(2)
1.9
1.6
1.9
1.6
AMIN
See
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.
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
Parameter
Conditions
Typ
LM2940-N
Limit
Typ
Limit
(1)
Units
(1)
Maximum Line Transient RO = 100Ω
T ≤ 100 ms
Reverse Polarity
DC Input Voltage
LM2940-N
75
60/60
LM2940C
55
45
LM2940-N
−30
−15/−15
LM2940C
−30
−15
LM2940-N
−75
−50/−50
LM2940C
−55
−45/−45
75
60/60
VMIN
−30
−15/−15
VMIN
−75
−50/−50
VMIN
RO = 100Ω
Reverse Polarity
Transient Input Voltage
RO = 100Ω
T ≤ 100 ms
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)
Parameter
12V
Conditions
LM2940-N
Limit (1)
12.0
0
11.64/11.40
LM2940N/833
Limit (2)
11.64/11.40
12.36/12.60
12.36/12.60
20
120
75/120
LM2940-N, LM2940-N/883
55
120/200
120/190
LM2940C
55
120
Typ
LM2940-N
Limit (1)
15.0
0
14.55/14.25
14.55/14.25
VMIN
15.45/15.75
15.45/15.75
VMAX
20
150
95/150
mVMAX
150/240
mVMAX
70
150
1000/1000
mΩ
15/20
mAMAX
50/60
mAMAX
1000/1000
μVrms
13.6V ≤ VIN ≤ 26V
Output Voltage
5 mA ≤ IO ≤1A
Line Regulation
15V
Typ
VO + 2V ≤ VIN ≤ 26V,
LM2940N/833
Limit (2)
Units
16.75V ≤ VIN ≤ 26V
IO = 5 mA
Load Regulation
Output Impedance
50 mA ≤ IO ≤ 1A
100 mADC and
20 mArms,
80
1000/1000
100
fO = 120 Hz
Quiescent
Current
Output Noise
Voltage
(1)
(2)
6
VO +2V ≤ VIN ≤ 26V,
IO = 5 mA
LM2940-N, LM2940-N/883
10
15/20
LM2940C
10
15
VIN = VO + 5V, IO = 1A
30
45/60
10 Hz − 100 kHz,
360
15/20
10
15
50/60
30
45/60
1000/1000
450
IO = 5 mA
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.
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)
Parameter
Ripple Rejection
12V
Conditions
Typ
LM2940-N
Limit (1)
LM2940-N
66
54/48
LM2940C
66
54
15V
LM2940N/833
Limit (2)
Typ
LM2940-N
Limit (1)
64
52
LM2940N/833
Limit (2)
Units
fO = 120 Hz, 1 Vrms,
IO = 100 mA
fO = 1 kHz, 1 Vrms,
52/46
IO = 5 mA
Long Term Stability
Dropout Voltage
48
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
(3)
1.9
1.6
1.6/1.3
1.9
1.6
1.6/1.3
AMIN
75
60/60
40/40
VMIN
55
45
55
45
LM2940-N, LM2940-N/883
−30
−15/−15
−15/−15
VMIN
LM2940C
−30
−15
−30
−15
−75
−50/−50
−45/−45
VMIN
−55
−45/−45
−55
−45/−45
RO = 100Ω
LM2940-N, T ≤ 100 ms
LM2940C, T ≤ 1 ms
Reverse Polarity
Transient Input
Voltage
40/40
RO = 100Ω
−15/−15
RO = 100Ω
LM2940-N, T ≤ 100 ms
LM2940-N/883, T ≤ 20 ms
LM2940C, T ≤ 1 ms
(3)
dBMIN
mV/
1000 Hr
60
LM2940-N/883, T ≤ 20 ms
Reverse Polarity
DC Input Voltage
48/42
IO = 1A
Short Circuit Current See
Maximum Line
Transient
dBMIN
−45/−45
Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
Thermal Performance
Thermal Resistance
Junction-to-Case, θ(JC)
3-Lead TO-220
4
3-Lead DDPAK/TO-263
4
3-Lead TO-220
Thermal Resistance
Junction-to-Ambient, θ(JA)
3-Lead DDPAK/TO-263
SOT-223
60
(1)
(1)
8-Lead WSON
(1)
(1)
°C/W
80
174
(1)
°C/W
35
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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Typical Performance Characteristics
8
Dropout Voltage
Dropout Voltage
vs.
Temperature
Figure 8.
Figure 9.
Output Voltage
vs.
Temperature
Quiescent Current
vs.
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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Typical Performance Characteristics (continued)
10
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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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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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.
12
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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
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LM2940-N, LM2940C
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SNVS769I – MARCH 2000 – REVISED 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(H−A), must
first be calculated:
θ(H−A) = θ(JA) − θ(C−H) − θ(J−C)
where
•
•
θ(J−C) 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(J−C) for this calculation.
θ(C−H) is defined as the thermal resistance between the case and the surface of the heatsink. The value
of θ(C−H) 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(C−H).
(3)
When a value for θ(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.
θ(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 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
Product Folder Links: LM2940-N LM2940C
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LM2940-N, LM2940C
SNVS769I – MARCH 2000 – REVISED 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. TA for 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
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Product Folder Links: LM2940-N LM2940C
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SNVS769I – MARCH 2000 – REVISED APRIL 2013
Figure 39. θ(JA) vs. Copper (2 ounce) Area for the SOT-223 Package
Figure 40. Maximum Power Dissipation vs. TA for 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
Product Folder Links: LM2940-N LM2940C
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17
LM2940-N, LM2940C
SNVS769I – MARCH 2000 – REVISED APRIL 2013
www.ti.com
REVISION HISTORY
Changes from Revision H (April 2013) to Revision I
•
18
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 17
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PACKAGE OPTION ADDENDUM
www.ti.com
23-Sep-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
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+
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
Orderable Device
23-Sep-2013
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
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/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
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
1000
Addendum-Page 2
LM2940CT
-5.0 P+
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
23-Sep-2013
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
LM2940IMPX-10/NOPB
ACTIVE
SOT-223
DCY
4
LM2940IMPX-12
ACTIVE
SOT-223
DCY
4
LM2940IMPX-12/NOPB
ACTIVE
SOT-223
DCY
4
LM2940IMPX-5.0
ACTIVE
SOT-223
DCY
LM2940IMPX-5.0/NOPB
ACTIVE
SOT-223
LM2940IMPX-8.0
ACTIVE
LM2940IMPX-8.0/NOPB
2000
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
L55B
TBD
Call TI
Call TI
-40 to 85
L56B
2000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
L56B
4
2000
TBD
Call TI
Call TI
-40 to 85
L53B
DCY
4
2000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
L53B
SOT-223
DCY
4
TBD
Call TI
Call TI
-40 to 85
L54B
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
Pb-Free (RoHS
Exempt)
CU SN
Level-3-245C-168 HR
-40 to 125
LM2940S
-8.0 P+
45
Addendum-Page 3
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
23-Sep-2013
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
LM2940S-9.0
ACTIVE
DDPAK/
TO-263
KTT
3
LM2940S-9.0/NOPB
ACTIVE
DDPAK/
TO-263
KTT
3
LM2940SX-10
ACTIVE
DDPAK/
TO-263
KTT
LM2940SX-10/NOPB
ACTIVE
DDPAK/
TO-263
LM2940SX-12
ACTIVE
LM2940SX-12/NOPB
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
TBD
Call TI
Call TI
-40 to 125
LM2940S
-9.0 P+
45
Pb-Free (RoHS
Exempt)
CU SN
Level-3-245C-168 HR
-40 to 125
LM2940S
-9.0 P+
3
500
TBD
Call TI
Call TI
-40 to 125
LM2940S
-10 P+
KTT
3
500
Pb-Free (RoHS
Exempt)
CU SN
Level-3-245C-168 HR
-40 to 125
LM2940S
-10 P+
DDPAK/
TO-263
KTT
3
500
TBD
Call TI
Call TI
-40 to 125
LM2940S
-12 P+
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
Addendum-Page 4
LM2940T
-5.0 P+
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
23-Sep-2013
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
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
Addendum-Page 5
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
23-Sep-2013
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.
Addendum-Page 6
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) 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
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) 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
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
LM2940IMPX-5.0
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
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
*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
Pack Materials-Page 3
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
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
Pack Materials-Page 4
MECHANICAL DATA
NDE0003B
www.ti.com
MECHANICAL DATA
NDG0003F
T03F (Rev B)
www.ti.com
MECHANICAL DATA
MPDS094A – APRIL 2001 – REVISED JUNE 2002
DCY (R-PDSO-G4)
PLASTIC SMALL-OUTLINE
6,70 (0.264)
6,30 (0.248)
3,10 (0.122)
2,90 (0.114)
4
0,10 (0.004) M
3,70 (0.146)
3,30 (0.130)
7,30 (0.287)
6,70 (0.264)
Gauge Plane
1
2
0,84 (0.033)
0,66 (0.026)
2,30 (0.091)
4,60 (0.181)
1,80 (0.071) MAX
3
0°–10°
0,10 (0.004) M
0,25 (0.010)
0,75 (0.030) MIN
1,70 (0.067)
1,50 (0.059)
0,35 (0.014)
0,23 (0.009)
Seating Plane
0,08 (0.003)
0,10 (0.0040)
0,02 (0.0008)
4202506/B 06/2002
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters (inches).
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion.
Falls within JEDEC TO-261 Variation AA.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MECHANICAL DATA
NGN0008A
LDC08A (Rev B)
www.ti.com
MECHANICAL DATA
KTT0003B
TS3B (Rev F)
BOTTOM SIDE OF PACKAGE
www.ti.com
MECHANICAL DATA
NEB0003G
TA03G (Rev A)
www.ti.com
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