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LM2940 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2940
Description  1A Low Dropout Regulator
PDF  19 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2940 Datasheet(HTML) 6 Page - 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)
9V
10V
Units
Parameter
Conditions
Typ
LM2940
Typ
LM2940
Limit
Limit
(Note 4)
(Note 4)
Short Circuit
(Note 6)
1.9
1.6
1.9
1.6
A
MIN
Current
Maximum Line
R
O = 100
Ω
Transient
T
≤ 100 ms
LM2940
75
60/60
75
60/60
V
MIN
LM2940C
55
45
Reverse Polarity
R
O = 100
Ω
DC Input Voltage
LM2940
−30
−15/−15
−30
−15/−15
V
MIN
LM2940C
−30
−15
Reverse Polarity
R
O = 100
Ω
Transient Input
T
≤ 100 ms
Voltage
LM2940
−75
−50/−50
−75
−50/−50
V
MIN
LM2940C
−55
−45/−45
Electrical Characteristics
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)
13.6V
≤ V
IN
≤ 26V
16.75V
≤ V
IN
≤ 26V
Output Voltage
5 mA
≤ I
O
≤1A
12.00
11.64/11.40
11.64/11.40
15.00
14.55/14.25
14.55/14.25
V
MIN
12.36/12.60
12.36/12.60
15.45/15.75
15.45/15.75
V
MAX
Line Regulation
V
O +2V
≤ V
IN
≤ 26V,
20
120
75/120
20
150
95/150
mV
MAX
I
O =5 mA
Load Regulation
50 mA
≤ I
O
≤ 1A
LM2940, LM2940/883
55
120/200
120/190
150/240
mV
MAX
LM2940C
55
120
70
150
Output
100 mADC and
Impedance
20 mArms,
80
1000/1000
100
1000/1000
m
Ω
f
O = 120 Hz
Quiescent
Current
V
O +2V
≤ V
IN
≤ 26V,
I
O =5 mA
LM2940, LM2940/883
10
15/20
15/20
15/20
mA
MAX
LM2940C
10
15
10
15
V
IN =VO + 5V, IO = 1A
30
45/60
50/60
30
45/60
50/60
mA
MAX
Output Noise
10 Hz − 100 kHz,
360
1000/1000
450
1000/1000
µV
rms
Voltage
I
O =5 mA
Ripple Rejection
f
O = 120 Hz, 1 Vrms,
I
O = 100 mA
LM2940
66
54/48
dB
MIN
LM2940C
66
54
64
52
f
O = 1 kHz, 1 Vrms,
52/46
48/42
dB
MIN
I
O =5 mA
www.national.com
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