LM2940,LM2940C.pdf
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January 2003
LM2940/LM2940C
1A Low Dropout Regulator
General Description
The LM2940/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 volt-
age 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 (V
IN
−V
OUT
≤
momentarily exceed the specified maximum operating volt-
age, 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 in-
sertion. Familiar regulator features such as short circuit and
thermal overload protection are also provided.
3V).
Designed also for vehicular applications, the LM2940/
LM2940C and all regulated circuitry are protected from re-
verse battery installations or 2-battery jumps. During line
transients, such as load dump when the input voltage can
Features
n
Dropout voltage typically 0.5V
@
I
O
=1A
n
Output current in excess of 1A
n
Output voltage trimmed before assembly
n
Reverse battery protection
n
Internal short circuit current limit
n
Mirror image insertion protection
n
P
+
Product Enhancement tested
Typical Application
00882203
*
Required if regulator is located far from power supply filter.
**
C
OUT
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.
Ordering Information
Temperature
Range
Output Voltage
Package
5.0
8.0
9.0
10
12
15
0˚C
≤
T
J
≤
125˚C LM2940CT-5.0
LM2940CT-9.0
LM2940CT-12
LM2940CT-15
TO-220
LM2940CS-5.0
LM2940CS-9.0
LM2940CS-12
LM2940CS-15
TO-263
−40˚C
≤
T
J
≤
125˚C
LM2940LD-5.0 LM2940LD-8.0 LM2940LD-9.0 LM2940LD-10 LM2940LD-12 LM2940LD-15 LLP 1k
Units
Tape and
Reel
LM2940LDX-5.0 LM2940LDX-8.0 LM2940LDX-9.0 LM2940LDX-10 LM2940LDX-12 LM2940LDX-15 LLP 4.5k
Units
Tape and
Reel
−40˚C
≤
T
J
≤
125˚C
LM2940T-5.0
LM2940T-8.0
LM2940T-9.0
LM2940T-10
LM2940T-12
TO-220
LM2940S-5.0
LM2940S-8.0
LM2940S-9.0
LM2940S-10
LM2940S-12
TO-263
−40˚C
≤
T
J
≤
LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 LM2940IMP-15 SOT-223
LM2940IMPX-5.0 LM2940IMPX-8.0 LM2940IMPX-9.0 LM2940IMPX-10 LM2940IMPX-12 LM2940IMPX-15 SOT-223
in Tape
and Reel
SOT-223
Package Marking
L53B
L54B
L0EB
L55B
L56B
L70B
The physical size of the SOT-223 is too small to contain the full device part number. The package markings indicated are what will appear on the actual device.
© 2003 National Semiconductor Corporation
DS008822
www.national.com
85˚C
Ordering Information
(Continued)
Temperature
Range
Output Voltage
Package
5.0
8.0
12
15
−55˚C
≤
T
J
≤
125˚C
LM2940J-5.0/883
5962-8958701EA
LM2940J-8.0/883
5962-9088301QEA
LM2940J-12/883
5962-9088401QEA
LM2940J-15/883
5962-9088501QEA
J16A
LM2940WG5.0/883
5962-8958701XA
WG16A
For information on military temperature range products, please go to the Mil/Aero Web Site at http://www.national.com/appinfo/milaero/index.html.
Connection Diagrams
(TO-220) Plastic Package
3-Lead SOT-223
00882202
00882242
Front View
Order Number LM2940CT-5.0, LM2940CT-9.0,
LM2940CT-12, LM2940CT-15, LM2940T-5.0,
LM2940T-8.0, LM2940T-9.0,
LM2940T-10 or LM2940T-12
See NS Package Number TO3B
Front View
Order Part Number LM2940IMP-5.0,
LM2940IMP-8.0, LM2940IMP-9.0,
LM2940IMP-10, LM2940IMP-12 or LM2940IMP-15
See NS Package Number MP04A
16-Lead Dual-in-Line Package (J)
16-Lead Ceramic Surface-Mount Package (WG)
00882243
00882244
Top View
Order Number LM2940J-5.0/883 (5962-8958701EA),
LM2940J-8.0/883 (5962-9088301QEA),
LM2940J-12/883 (5962-9088401QEA),
LM2940J-15/883 (5962-9088501QEA)
See NS Package Number J16A
Top View
Order Number LM2940WG5.0/883 (5962-8958701XA)
See NS Package Number WG16A
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2
Connection Diagrams
(Continued)
(TO-263) Surface-Mount Package
8-Lead LLP
00882211
Top View
00882212
Side View
Order Number LM2940CS-5.0, LM2940CS-9.0,
LM2940CS-12, LM2940CS-15,
LM2940S-5.0, LM2940S-8.0,
LM2940S-9.0, LM2940S-10 or LM2940S-12
See NS Package Number TS3B
00882246
Top View
Order Number LM2940LD-5.0, LM2940LD-8.0,
LM2940LD-9.0, LM2940LD-10,
LM2940LD-12, LM2940LD-15
See NS Package Number LDC08A
Pin 2 and pin 7 are fused to center DAP
Pin 5 ans 6 need to be tied together on PCB board
3
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Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM2940S, T, MP
SOT-223 (MP) Package
260˚C, 4s
ESD Susceptibility (Note 3)
2 kV
Operating Conditions
(Note 1)
≤
100 ms
60V
Input Voltage
26V
LM2940CS, T
≤
1 ms
45V
Temperature Range
LM2940T, LM2940S
Internal Power Dissipation
(Note 2) Internally Limited
Maximum Junction Temperature 150˚C
Storage Temperature Range −65˚C
≤
T
J
≤
+150˚C
Lead Temperature, Time for Wave Soldering
TO-220 (T) Package
−40˚C
≤
T
J
≤
125˚C
LM2940CT, LM2940CS
0˚C
≤
T
J
≤
125˚C
LM2940IMP
−40˚C
≤
T
J
≤
85˚C
LM2940J, LM2940WG
−55˚C
≤
T
J
≤
125˚C
260˚C, 10s
LM2940LD
−40˚C
≤
T
J
≤
125˚C
TO-263 (S) Package
260˚C, 4s
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
LM2940
LM2940/883
LM2940
LM2940/883
Units
Parameter
Conditions
Typ
Limit
Limit
Typ
Limit
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
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
1A
LM2940, LM2940/883
≤
I
O
≤
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
m
Ω
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
= 1 kHz, 1 V
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 6)
1.9
1.6
1.5/
1.3
1.9
1.6
1.6/
1.3
A
MIN
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4
50 mA
Electrical Characteristics
(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.
Output Voltage (V
O
)
5V
8V
LM2940
LM2940/883
LM2940
LM2940/883
Units
Parameter
Conditions
Typ
Limit
Limit
Typ
Limit
Limit
(Note 4)
(Note 5)
(Note 4)
(Note 5)
Maximum Line
R
O
= 100
Ω
Transient
LM2940, T
≤
100 ms
75
60/
60
75
60/
60
V
MIN
LM2940/883, T
≤
20 ms
40/
40
40/
40
LM2940C, T
≤
1 ms
55
45
55
45
Reverse Polarity
R
O
= 100
Ω
DC Input Voltage
LM2940, LM2940/883
−30
−15/
−15
−15/
−15
−30
−15/
−15
−15/
−15
V
MIN
LM2940C
−30
−15
−30
−15
Reverse Polarity
R
O
= 100
Ω
Transient Input
LM2940, T
≤
100 ms
−75
−50/
−50
−75
−50/
−50
V
MIN
Voltage
LM2940/883, T
≤
20 ms
−45/
−45
−45/
−45
LM2940C, T
≤
1 ms
−55
−45/
−45
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
)
9V
10V
LM2940
LM2940
Units
Parameter
Conditions
Typ
Limit
Typ
Limit
(Note 4)
(Note 4)
10.5V
≤
V
IN
≤
26V
11.5V
≤
V
IN
≤
26V
Output Voltage
5 mA
≤
I
O
≤
1A
9.00
8.73/
8.55
10.00
9.70/
9.50
V
MIN
9.27/
9.45
10.30/
10.50
V
MAX
Line Regulation
V
O
+2V
≤
V
IN
≤
26V,
20
90
20
100
mV
MAX
I
O
=5mA
Load Regulation
50 mA
≤
I
O
≤
1A
LM2940
60
90/
150
65
100/
165
mV
MAX
LM2940C
60
90
Output Impedance
100 mADC and
20 mArms,
60
65
m
Ω
f
O
= 120 Hz
Quiescent
V
O
+2V
≤
V
IN
<
26V,
Current
I
O
=5mA
LM2940
10
15/
20
10
15/
20
mA
MAX
LM2940C
10
15
V
IN
=V
O
+ 5V, I
O
= 1A
30
45/
60
30
45/
60
mA
MAX
Output Noise
10 Hz − 100 kHz,
270
300
µV
rms
Voltage
I
O
=5mA
Ripple Rejection
f
O
= 120 Hz, 1 V
rms
,
I
O
= 100 mA
LM2940
64
52/
46
63
51/
45
dB
MIN
LM2940C
64
52
Long Term
Stability
34
36
mV/
1000 Hr
Dropout Voltage
I
O
= 1A
0.5
0.8/
1.0
0.5
0.8/
1.0
V
MAX
I
O
= 100 mA
110
150/
200
110
150/
200
mV
MAX
5
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