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LM2940S-10 Fiches technique(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No de pièce LM2940S-10
Description  1A Low Dropout Regulator
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Electrical Characteristics (Continued)
V
IN =VO + 5V, IO = 1A, CO = 22 µF, unless otherwise specified. Boldface limits apply over the entire operating tempera-
ture range of the indicated device. All other specifications apply for T
A =TJ = 25˚C.
Output Voltage (V
O)
12V
15V
Units
LM2940
LM2940/833
LM2940
LM2940/833
Parameter
Conditions
Typ
Limit
Limit
Typ
Limit
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
Long Term
48
60
mV/
Stability
1000 Hr
Dropout Voltage
I
O = 1A
0.5
0.8/1.0
0.7/1.0
0.5
0.8/1.0
0.7/1.0
V
MAX
I
O = 100 mA
110
150/200
150/200
110
150/200
150/200
mV
MAX
Short Circuit
(Note 6)
1.9
1.6
1.6/1.3
1.9
1.6
1.6/1.3
A
MIN
Current
Maximum Line
R
O = 100
Transient
LM2940, T
≤ 100 ms
75
60/60
LM2940/883, T
≤ 20 ms
40/40
40/40
V
MIN
LM2940C, T
≤ 1 ms
5545
5545
Reverse Polarity
R
O = 100
DC Input
LM2940, LM2940/883
−30
−15/−15
−15/−15
−15/−15
V
MIN
Voltage
LM2940C
−30
−15
−30
−15
Reverse Polarity
R
O = 100
Transient Input
LM2940, T
≤ 100 ms
−75
−50/−50
Voltage
LM2940/883, T
≤ 20 ms
−45/−45
−45/−45
V
MIN
LM2940C, T
≤ 1 ms
−55
−45/−45
−55
−45/−45
Thermal Performance
Thermal Resistance
Junction-to-Case
3-Lead TO-220
4
˚C/W
3-Lead TO-263
4
˚C/W
Thermal Resistance
Junction-to-Ambient
3-Lead TO-220
60
˚C/W
3-Lead TO-263
80
˚C/W
8-Lead LLP (Note 2)
35
˚C/W
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions
but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics.
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal resistance, 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 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 LLP 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 LLP package, refer to Application Note AN-1187. It is recommended that 6 vias be placed under the center pad to improve thermal performance.
Note 3: ESD rating is based on the human body model, 100 pF discharged through 1.5 k
Ω.
Note 4: All limits are guaranteed 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 guaranteed via correlation using standard Statistical Quality Control
methods.
Note 5: All limits are guaranteed 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.
Note 6: Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
www.national.com
7


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