LM2940/LM2940C
Electrical Characteristics
Output Voltage (V
O
)
Parameter
Short Circuit
Current
Maximum Line
Transient
R
O
= 100Ω
T
≤
100 ms
LM2940
LM2940C
Reverse Polarity
DC Input Voltage
Reverse Polarity
Transient Input
Voltage
R
O
= 100Ω
LM2940
LM2940C
R
O
= 100Ω
T
≤
100 ms
LM2940
LM2940C
(Continued)
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.
9V
LM2940
Conditions
Typ
1.9
Limit
1.6
1.9
Typ
10V
LM2940
Limit
1.6
A
MIN
Units
75
55
−30
−30
60/60
45
−15/−15
−15
75
60/60
V
MIN
−30
−15/−15
V
MIN
−75
−55
−50/−50
−45/−45
−75
−50/−50
V
MIN
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
)
Parameter
Conditions
Typ
12V
LM2940
Limit
Output Voltage
Line Regulation
Load Regulation
5 mA
≤
I
O
≤1A
V
O
+ 2V
≤
V
IN
≤
26V,
I
O
= 5 mA
50 mA
≤
I
O
≤
1A
LM2940, LM2940/883
LM2940C
Output
Impedance
Quiescent
Current
100 mADC and
20 mArms,
f
O
= 120 Hz
V
O
+2V
≤
V
IN
≤
26V,
I
O
= 5 mA
LM2940, LM2940/883
LM2940C
V
IN
= V
O
+ 5V, I
O
= 1A
Output Noise
Voltage
Ripple Rejection
10 Hz − 100 kHz,
I
O
= 5 mA
f
O
= 120 Hz, 1 V
rms
,
I
O
= 100 mA
LM2940
LM2940C
f
O
= 1 kHz, 1 V
rms
,
I
O
= 5 mA
www.national.com
6
15V
LM2940/833
Limit
11.64/11.40
12.36/12.60
75/120
20
15.00
Typ
LM2940
Limit
14.55/14.25
15.45/15.75
150
LM2940/833
Limit
14.55/14.25
15.45/15.75
95/150
V
MIN
V
MAX
mV
MAX
Units
13.6V
≤
V
IN
≤
26V
12.00
20
11.64/11.40
12.36/12.60
120
16.75V
≤
V
IN
≤
26V
55
55
80
120/200
120
120/190
70
1000/1000
100
150
150/240
mV
MAX
1000/1000
mΩ
10
10
30
360
15/20
15
45/60
15/20
10
50/60
1000/1000
30
450
15
45/60
15/20
50/60
1000/1000
mA
MAX
mA
MAX
µV
rms
66
66
54/48
54
52/46
64
52
48/42
dB
MIN
dB
MIN
NSC [ NATIONAL SEMICONDUCTOR ]
