Datasheet

Absolute Maximum Ratings (Notes 2, 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM2940S, T, IMP ≤ 100 ms 60V
LM2940K/883 ≤ 20 ms 40V
LM2940CS, T ≤ 1 ms 45V
Internal Power Dissipation
(Note 3) Internally Limited
Maximum Junction Temperature 150˚C
Storage Temperature Range −65˚C ≤ T
J
≤ +150˚C
Lead Temperature, Time for Wave Soldering
TO-3 (K) Package 300˚C, 10s
TO-220 (T) Package 260˚C, 10s
TO-263 (S) Package 260˚C, 4s
SOT-223 (IMP) Package 260˚C, 4s
ESD Susceptibility (Note 4) 2 kV
Operating Conditions(Note 1)
Input Voltage 26V
Temperature Range
LM2940K/883 −55˚C ≤ T
A
≤ 125˚C
LM2940T, LM2940S −40˚C ≤ T
A
≤ 125˚C
LM2940CT, LM2940CS 0˚C ≤ T
A
≤ 125˚C
LM2940IMP −40˚C ≤ T
A
≤ 85˚C
Electrical Characteristics
V
IN
=
V
O
+ 5V, I
O
=
1A, C
O
=
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
=
T
J
=
25˚C
Output Voltage (V
O
)5V 8V
Units
LM2940 LM2940/883 LM2940 LM2940/883
Parameter Conditions Typ Limit Limit Typ Limit Limit
(Note 5) (Note 6) (Note 5) (Note 6)
6.25V ≤ V
IN
≤ 26V 9.4V ≤ V
IN
≤ 26V
Output Voltage 5 mA ≤ I
O
≤ 1A 5.00 4.85/4.75 4.85/4.75 8.00 7.76/7.60 7.76/7.60 V
MIN
5.15/5.25 5.15/5.25 8.24/8.40 8.24/8.40 V
MAX
Line Regulation V
O
+2V≤V
IN
≤ 26V, 20 50 40/50 20 80 50/80 mV
MAX
I
O
=
5mA
Load Regulation 50 mA ≤ I
O
≤ 1A
LM2940, LM2940/883 35 50/80 50/100 55 80/130 80/130 mV
MAX
LM2940C 35 50 55 80
Output 100 mADC and
Impedance 20 mArms, 35 1000/1000 55 1000/1000 mΩ
f
O
=
120 Hz
Quiescent V
O
+2V ≤ V
IN
≤ 26V,
Current I
O
=
5mA
LM2940, LM2940/883 10 15/20 15/20 10 15/20 15/20 mA
MAX
LM2940C 10 15
V
IN
=
V
O
+ 5V, 30 45/60 50/60 30 45/60 50/60 mA
MAX
I
O
=
1A
Output Noise 10 Hz − 100 kHz, 150 700/700 240 1000/1000 µV
rms
Voltage I
O
=
5mA
Ripple Rejection f
O
=
120 Hz, 1 V
rms
,
I
O
=
100 mA
LM2940 72 60/54 66 54/48 dB
MIN
LM2940C 72 60 66 54
f
O
=
1kHz,1V
rms
, 60/50 54/48 dB
MIN
I
O
=
5mA
Long Term 20 32 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
Current
(Note 7)
1.9 1.6 1.5/1.3 1.9 1.6 1.6/1.3 A
MIN
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