LM140/LM340A/LM340/LM7800C
Series 3-Terminal Positive Regulators
General Description
The LM140/LM340A/LM340/LM7800C monolithic 3-terminal
positive voltage regulators employ internal current-limiting,
thermal shutdown and safe-area compensation, making
them essentially indestructible. If adequate heat sinking is
provided, they can deliver over 1.0A output current. They are
intended as fixed voltage regulators in a wide range of appli-
cations including local (on-card) regulation for elimination of
noise and distribution problems associated with single-point
regulation. In addition to use as fixed voltage regulators,
these devices can be used with external components to ob-
tain adjustable output voltages and currents.
Considerable effort was expended to make the entire series
of regulators easy to use and minimize the number of exter-
nal components. It is not necessary to bypass the output, al-
though this does improve transient response. Input bypass-
ing is needed only if the regulator is located far from the filter
capacitor of the power supply.
The 5V, 12V, and 15V regulator options are available in the
steel TO-3 power package. The LM340A/LM340/LM7800C
series is available in the TO-220 plastic power package, and
the LM340-5.0 is available in the SOT-223 package, as well
as the LM340-5.0 and LM340-12 in the surface-mount
TO-263 package.
Features
n
Complete specifications at 1A load
n
Output voltage tolerances of
2% at T
j
= 25C and
4%
over the temperature range (LM140A/LM340A)
n
Line regulation of 0.01% of V
OUT
/V of
V
IN
at 1A load
(LM140A/LM340A)
n
Load regulation of 0.3% of V
OUT
/A (LM140A/LM340A)
n
Internal thermal overload protection
n
Internal short-circuit current limit
n
Output transistor safe area protection
n
P
+
Product Enhancement tested
Device
Output
Voltages
Packages
LM140
5, 12,
15
TO-3 (K)
LM340A/LM340
5, 12,
15
TO-3 (K), TO-220 (T),
SOT-223 (MP), TO-263 (S)
(5V and 12V only)
LM7800C
5, 8, 12,
15
TO-220 (T)
Typical Applications
Fixed Output Regulator
DS007781-1
*
Required if the regulator is located far from the power supply filter.
**
Although no output capacitor is needed for stability, it does help transient
response. (If needed, use 0.1 F, ceramic disc).
Adjustable Output Regulator
DS007781-2
V
OUT
= 5V + (5V/R1 + I
Q
) R2 5V/R1
>
3 I
Q
,
load regulation (L
r
)
[(R1 + R2)/R1] (L
r
of LM340-5).
Current Regulator
DS007781-3
I
Q
= 1.3 mA over line and load changes.
Comparison between SOT-223 and D-Pak (TO-252)
Packages
DS007781-38
Scale 1:1
May 1999
LM140/LM340A/LM340/LM7800C
Series
3-T
erminal
Positive
Regulators
1999 National Semiconductor Corporation
DS007781
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 5)
DC Input Voltage
All Devices except
LM7824/LM7824C
35V
LM7824/LM7824C
40V
Internal Power Dissipation (Note 2)
Internally Limited
Maximum Junction Temperature
150C
Storage Temperature Range
-65C to +150C
Lead Temperature (Soldering, 10 sec.)
TO-3 Package (K)
300C
TO-220 Package (T), TO-263
Package (S)
230C
ESD Susceptibility (Note 3)
2 kV
Operating Conditions
(Note 1)
Temperature Range (T
A
) (Note 2)
LM140A, LM140
-55C to +125C
LM340A, LM340, LM7805C,
LM7812C, LM7815C, LM7808C
0C to +125C
LM340A
Electrical Characteristics
I
OUT
= 1A, -55C
T
J
+150C (LM140A), or 0C
T
J
+ 125C (LM340A) unless otherwise specified (Note 4)
Output Voltage
5V
12V
15V
Symbol
Input Voltage (unless otherwise noted)
10V
19V
23V
Units
Parameter
Conditions
Min
Typ Max
Min
Typ Max
Min
Typ
Max
V
O
Output Voltage
T
J
= 25C
4.9
5
5.1
11.75
12 12.25
14.7
15
15.3
V
P
D
15W, 5 mA
I
O
1A
4.8
5.2
11.5
12.5
14.4
15.6
V
V
MIN
V
IN
V
MAX
(7.5
V
IN
20)
(14.8
V
IN
27)
(17.9
V
IN
30)
V
V
O
Line Regulation
I
O
= 500 mA
10
18
22
mV
V
IN
(7.5
V
IN
20)
(14.8
V
IN
27)
(17.9
V
IN
30)
V
T
J
= 25C
3
10
4
18
4
22
mV
V
IN
(7.5
V
IN
20)
(14.5
V
IN
27)
(17.5
V
IN
30)
V
T
J
= 25C
4
9
10
mV
Over Temperature
12
30
30
mV
V
IN
(8
V
IN
12)
(16
V
IN
22)
(20
V
IN
26)
V
V
O
Load Regulation
T
J
= 25C
5 mA
I
O
1.5A
10
25
12
32
12
35
mV
250 mA
I
O
750 mA
15
19
21
mV
Over Temperature,
25
60
75
mV
5 mA
I
O
1A
I
Q
Quiescent Current
T
J
= 25C
6
6
6
mA
Over Temperature
6.5
6.5
6.5
mA
I
Q
Quiescent Current
5 mA
I
O
1A
0.5
0.5
0.5
mA
Change
T
J
= 25C, I
O
= 1A
0.8
0.8
0.8
mA
V
MIN
V
IN
V
MAX
(7.5
V
IN
20)
(14.8
V
IN
27)
(17.9
V
IN
30)
V
I
O
= 500 mA
0.8
0.8
0.8
mA
V
MIN
V
IN
V
MAX
(8
V
IN
25)
(15
V
IN
30)
(17.9
V
IN
30)
V
V
N
Output Noise Voltage
T
A
= 25C, 10 Hz
f
100 kHz
40
75
90
V
Ripple Rejection
T
J
= 25C, f = 120 Hz, I
O
= 1A
68
80
61
72
60
70
dB
or f = 120 Hz, I
O
= 500 mA,
68
61
60
dB
Over Temperature,
V
MIN
V
IN
V
MAX
(8
V
IN
18)
(15
V
IN
25)
(18.5
V
IN
28.5)
V
R
O
Dropout Voltage
T
J
= 25C, I
O
= 1A
2.0
2.0
2.0
V
Output Resistance
f = 1 kHz
8
18
19
m
Short-Circuit Current
T
J
= 25C
2.1
1.5
1.2
A
Peak Output Current
T
J
= 25C
2.4
2.4
2.4
A
Average TC of V
O
Min, T
J
= 0C, I
O
= 5 mA
-0.6
-1.5
-1.8
mV/C
V
IN
Input Voltage
T
J
= 25C
Required to Maintain
7.5
14.5
17.5
V
Line Regulation
www.national.com
2
LM140
Electrical Characteristics
(Note 4)
-55C
T
J
+150C unless otherwise specified
Output Voltage
5V
12V
15V
Symbol
Input Voltage (unless otherwise noted)
10V
19V
23V
Units
Parameter
Conditions
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
V
O
Output Voltage
T
J
= 25C, 5 mA
I
O
1A
4.8
5
5.2
11.5
12
12.5
14.4
15
15.6
V
P
D
15W, 5 mA
I
O
1A
4.75
5.25
11.4
12.6
14.25
15.75
V
V
MIN
V
IN
V
MAX
(8
V
IN
20)
(15.5
V
IN
27)
(18.5
V
IN
30)
V
V
O
Line Regulation
I
O
= 500 mA
T
J
= 25C
3
50
4
120
4
150
mV
V
IN
(7
V
IN
25)
(14.5
V
IN
30)
(17.5
V
IN
30)
V
-55C
T
J
+150C
50
120
150
mV
V
IN
(8
V
IN
20)
(15
V
IN
27)
(18.5
V
IN
30)
V
I
O
1A
T
J
= 25C
50
120
150
mV
V
IN
(7.5
V
IN
20)
(14.6
V
IN
27)
(17.7
V
IN
30)
V
-55C
T
J
+150C
25
60
75
mV
V
IN
(8
V
IN
12)
(16
V
IN
22)
(20
V
IN
26)
V
V
O
Load Regulation
T
J
= 25C
5 mA
I
O
1.5A
10
50
12
120
12
150
mV
250 mA
I
P
750 mA
25
60
75
mV
-55C
T
J
+150C,
50
120
150
mV
5 mA
I
O
1A
I
Q
Quiescent Current
I
O
1A
T
J
= 25C
6
6
6
mA
-55C
T
J
+150C
7
7
7
mA
I
Q
Quiescent Current
5 mA
I
O
1A
0.5
0.5
0.5
mA
Change
T
J
= 25C, I
O
1A
0.8
0.8
0.8
mA
V
MIN
V
IN
V
MAX
(8
V
IN
20)
(15
V
IN
27)
(18.5
V
IN
30)
V
I
O
= 500 mA, -55C
T
J
+150C
0.8
0.8
0.8
mA
V
MIN
V
IN
V
MAX
(8
V
IN
25)
(15
V
IN
30)
(18.5
V
IN
30)
V
V
N
Output Noise Voltage
T
A
= 25C, 10 Hz
f
100 kHz
40
75
90
V
Ripple Rejection
I
O
1A, T
J
= 25C or
68
80
61
72
60
70
dB
f = 120 Hz
I
O
500 mA,
68
61
60
dB
-55C
T
J
+150C
V
MIN
V
IN
V
MAX
(8
V
IN
18)
(15
V
IN
25)
(18.5
V
IN
28.5)
V
R
O
Dropout Voltage
T
J
= 25C, I
O
= 1A
2.0
2.0
2.0
V
Output Resistance
f = 1 kHz
8
18
19
m
Short-Circuit Current
T
J
= 25C
2.1
1.5
1.2
A
Peak Output Current
T
J
= 25C
2.4
2.4
2.4
A
Average TC of V
OUT
0C
T
J
+150C, I
O
= 5 mA
-0.6
-1.5
-1.8
mV/C
V
IN
Input Voltage
T
J
= 25C, I
O
1A
Required to Maintain
7.5
14.6
17.7
V
Line Regulation
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3
LM340/LM7800C
Electrical Characteristics
(Note 4)
0C
T
J
+125C unless otherwise specified
Output Voltage
5V
12V
15V
Symbol
Input Voltage (unless otherwise noted)
10V
19V
23V
Units
Parameter
Conditions
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
V
O
Output Voltage
T
J
= 25C, 5 mA
I
O
1A
4.8
5
5.2
11.5
12
12.5
14.4
15
15.6
V
P
D
15W, 5 mA
I
O
1A
4.75
5.25
11.4
12.6 14.25
15.75
V
V
MIN
V
IN
V
MAX
(7.5
V
IN
20)
(14.5
V
IN
27)
(17.5
V
IN
30)
V
V
O
Line Regulation
I
O
= 500 mA
T
J
= 25C
3
50
4
120
4
150
mV
V
IN
(7
V
IN
25)
(14.5
V
IN
30)
(17.5
V
IN
30)
V
0C
T
J
+125C
50
120
150
mV
V
IN
(8
V
IN
20)
(15
V
IN
27)
(18.5
V
IN
30)
V
I
O
1A
T
J
= 25C
50
120
150
mV
V
IN
(7.5
V
IN
20)
(14.6
V
IN
27)
(17.7
V
IN
30)
V
0C
T
J
+125C
25
60
75
mV
V
IN
(8
V
IN
12)
(16
V
IN
22)
(20
V
IN
26)
V
V
O
Load Regulation
T
J
= 25C
5 mA
I
O
1.5A
10
50
12
120
12
150
mV
250 mA
I
O
750 mA
25
60
75
mV
5 mA
I
O
1A, 0C
T
J
+125C
50
120
150
mV
I
Q
Quiescent Current
I
O
1A
T
J
= 25C
8
8
8
mA
0C
T
J
+125C
8.5
8.5
8.5
mA
I
Q
Quiescent Current
5 mA
I
O
1A
0.5
0.5
0.5
mA
Change
T
J
= 25C, I
O
1A
1.0
1.0
1.0
mA
V
MIN
V
IN
V
MAX
(7.5
V
IN
20)
(14.8
V
IN
27)
(17.9
V
IN
30)
V
I
O
500 mA, 0C
T
J
+125C
1.0
1.0
1.0
mA
V
MIN
V
IN
V
MAX
(7
V
IN
25)
(14.5
V
IN
30)
(17.5
V
IN
30)
V
V
N
Output Noise Voltage
T
A
= 25C, 10 Hz
f
100 kHz
40
75
90
V
Ripple Rejection
I
O
1A, T
J
= 25C
62
80
55
72
54
70
dB
f = 120 Hz
or I
O
500 mA,
62
55
54
dB
0C
T
J
+125C
V
MIN
V
IN
V
MAX
(8
V
IN
18)
(15
V
IN
25)
(18.5
V
IN
28.5)
V
R
O
Dropout Voltage
T
J
= 25C, I
O
= 1A
2.0
2.0
2.0
V
Output Resistance
f = 1 kHz
8
18
19
m
Short-Circuit Current
T
J
= 25C
2.1
1.5
1.2
A
Peak Output Current
T
J
= 25C
2.4
2.4
2.4
A
Average TC of V
OUT
0C
T
J
+125C, I
O
= 5 mA
-0.6
-1.5
-1.8
mV/C
V
IN
Input Voltage
T
J
= 25C, I
O
1A
Required to Maintain
7.5
14.6
17.7
V
Line Regulation
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 at any ambient temperature is a function of the maximum junction temperature for operation (T
JMAX
= 125C or
150C), the junction-to-ambient thermal resistance (
JA
), and the ambient temperature (T
A
). P
DMAX
= (T
JMAX
- T
A
)/
JA
. If this dissipation is exceeded, the die tem-
perature will rise above T
JMAX
and the electrical specifications do not apply. If the die temperature rises above 150C, the device will go into thermal shutdown. For
the TO-3 package (K, KC), the junction-to-ambient thermal resistance (
JA
) is 39C/W. When using a heatsink,
JA
is the sum of the 4C/W junction-to-case thermal
resistance (
JC
) of the TO-3 package and the case-to-ambient thermal resistance of the heatsink. For the TO-220 package (T),
JA
is 54C/W and
JC
is 4C/W. If
SOT-223 is used, the junction-to-ambient thermal resistance is 174C/W and can be reduced by a heatsink (see Applications Hints on heatsinking).
If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package: Using 0.5 square
inches of copper area,
JA
is 50C/W; with 1 square inch of copper area,
JA
is 37C/W; and with 1.6 or more inches of copper area,
JA
is 32C/W.
Note 3: ESD rating is based on the human body model, 100 pF discharged through 1.5 k
.
Note 4: All characteristics are measured with a 0.22 F capacitor from input to ground and a 0.1 F capacitor from output to ground. All characteristics except noise
voltage and ripple rejection ratio are measured using pulse techniques (t
w
10 ms, duty cycle
5%). Output voltage changes due to changes in internal temperature
must be taken into account separately.
Note 5: A military RETS specification is available on request. At the time of printing, the military RETS specifications for the LM140AK-5.0/883, LM140AK-12/883,
and LM140AK-15/883 complied with the min and max limits for the respective versions of the LM140A. At the time of printing, the military RETS specifications for
the LM140K-5.0/883, LM140K-12/883, and LM140K-15/883 complied with the min and max limits for the respective versions of the LM140. The LM140H/883,
LM140K/883, and LM140AK/883 may also be procured as a Standard Military Drawing.
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4
LM7808C
Electrical Characteristics
0C
T
J
+150C, V
I
= 14V, I
O
= 500 mA, C
I
= 0.33 F, C
O
= 0.1 F, unless otherwise specified
Symbol
Parameter
Conditions (Note 6)
LM7808C
Units
Min
Typ
Max
V
O
Output Voltage
T
J
= 25C
7.7
8.0
8.3
V
V
O
Line Regulation
T
J
= 25C
10.5V
V
I
25V
6.0
160
mV
11.0V
V
I
17V
2.0
80
V
O
Load Regulation
T
J
= 25C
5.0 mA
I
O
1.5A
12
160
mV
250 mA
I
O
750
mA
4.0
80
V
O
Output Voltage
11.5V
V
I
23V, 5.0 mA
I
O
1.0A, P
15W
7.6
8.4
V
I
Q
Quiescent
Current
T
J
= 25C
4.3
8.0
mA
I
Q
Quiescent
With Line
11.5V
V
I
25V
1.0
mA
Current Change
With
Load
5.0 mA
I
O
1.0A
0.5
V
N
Noise
T
A
= 25C, 10 Hz
f
100 kHz
52
V
V
I
/
V
O
Ripple Rejection
f = 120 Hz, I
O
= 350 mA, T
J
= 25C
56
72
dB
V
DO
Dropout Voltage
I
O
= 1.0A, T
J
= 25C
2.0
V
R
O
Output Resistance
f = 1.0 kHz
16
m
I
OS
Output Short Circuit Current
T
J
= 25C, V
I
= 35V
0.45
A
I
PK
Peak Output Current
T
J
= 25C
2.2
A
V
O
/
T
Average Temperature
I
O
= 5.0 mA
0.8
mV/C
Coefficient of Output Voltage
Note 6: All characteristics are measured with a 0.22 F capacitor from input to ground and a 0.1 F capacitor from output to ground. All characteristics except noise
voltage and ripple rejection ratio are measured using pulse techniques (t
w
10 ms, duty cycle
5%). Output voltage changes due to changes in internal temperature
must be taken into account separately.
Typical Performance Characteristics
Maximum Average Power
Dissipation
DS007781-22
Maximum Average Power
Dissipation
DS007781-23
Maximum Power
Dissipation (TO-263)
(See Note 2)
DS007781-24
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