LM340/LM78XX Series 3-Terminal Positive Regulators
November 2004
LM340/LM78XX Series
3-Terminal Positive Regulators
General Description
The
LM140/LM340A/LM340/LM78XXC
monolithic
3-terminal positive voltage regulators employ internal
current-limiting, thermal shutdown and safe-area compensa-
tion, making them essentially indestructible. If adequate heat
sinking is provided, they can deliver over 1.0A output cur-
rent. They are intended as fixed voltage regulators in a wide
range of applications including local (on-card) regulation for
elimination of noise and distribution problems associated
with single-point regulation. In addition to use as fixed volt-
age regulators, these devices can be used with external
components to obtain adjustable output voltages and cur-
rents.
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,
although this does improve transient response. Input by-
passing 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/LM78XXC
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
= 25˚C and
±
4%
over the temperature range (LM340A)
n
Line regulation of 0.01% of V
OUT
/V of
∆V
IN
at 1A load
(LM340A)
n
Load regulation of 0.3% of V
OUT
/A (LM340A)
n
Internal thermal overload protection
n
Internal short-circuit current limit
n
Output transistor safe area protection
n
P
+
Product Enhancement tested
Typical Applications
Fixed Output Regulator
Adjustable Output Regulator
00778102
00778101
*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 µF, ceramic disc).
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
Comparison between SOT-223 and D-Pak (TO-252)
Packages
00778103
00778138
Scale 1:1
∆I
Q
= 1.3 mA over line and load changes.
© 2004 National Semiconductor Corporation
DS007781
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LM340/LM78XX
Ordering Information
Package
3-Lead TO-3
Temperature
Range
-55˚C to +125˚C
Part Number
LM140K-5.0
LM140K-12
LM140K-15
0˚C to +125˚C
LM340K-5.0
LM340K-12
LM340K-15
3-lead TO-220
0˚C to +125˚C
LM340AT-5.0
LM340T-5.0
LM340T-12
LM340T-15
LM7808CT
3-Lead TO-263
0˚C to +125˚C
LM340S-5.0
LM340SX-5.0
LM340S-12
LM340SX-12
LM340AS-5.0
LM340ASX-5.0
4-Lead
SOT-223
Unpackaged
Die
0˚C to +125˚C
−55˚C to 125˚C
LM340MP-5.0
LM340MPX-5.0
LM140KG-5 MD8
LM140KG-12 MD8
LM140KG-15 MD8
0˚C to +125˚C
LM340-5.0 MDA
LM7808C MDC
Packaging Marking
LM140K 5.0P+
LM140K 12P+
LM140K 15P+
LM340K 5.0 7805P+
LM340K 12 7812P+
LM340K 15 7815P+
LM340AT 5.0 P+
LM340T5 7805 P+
LM340T12 7812 P+
LM340T15 7815 P+
LM7808CT
LM340S-5.0 P+
LM340S-12 P+
LM340AS-5.0 P+
N00A
Transport Media
50 Per Tray
50 Per Tray
50 Per Tray
50 Per Tray
50 Per Tray
50 Per Tray
45 Units/Rail
45 Units/Rail
45 Units/Rail
45 Units/Rail
45 Units/Rail
45 Units/Rail
500 Units Tape and Reel
45 Units/Rail
500 Units Tape and Reel
45 Units/Rail
500 Units Tape and Reel
1k Units Tape and Reel
2k Units Tape and Reel
Waffle Pack or Gel Pack
Waffle Pack or Gel Pack
Waffle Pack or Gel Pack
Waffle Pack or Gel Pack
Waffle Pack or Gel Pack
DL069089
DL059093
DL059093
DI074056
DI074056
MP04A
TS3B
T03B
NSC
Drawing
K02A
Connection Diagrams
TO-3 Metal Can Package (K)
TO-220 Power Package (T)
00778111
00778112
Bottom View
See Package Number K02A
TO-263 Surface-Mount Package (S)
Top View
See Package Number T03B
3-Lead SOT-223
00778120
00778143
Top View
See Package Number TS3B
Top View
See Package Number MP04A
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2
LM340/LM78XX
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
Internal Power Dissipation (Note 2)
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
TO-3 Package (K)
300˚C
35V
Internally Limited
150˚C
−65˚C to +150˚C
TO-220 Package (T), TO-263
Package (S)
ESD Susceptibility (Note 3)
230˚C
2 kV
Operating Conditions
(Note 1)
Temperature Range (T
A
) (Note 2)
LM140
LM340A, LM340
LM7808C
−55˚C to +125˚C
0˚C to +125˚C
0˚C to +125˚C
LM340A Electrical Characteristics
I
OUT
= 1A, 0˚C
≤
T
J
≤
+ 125˚C (LM340A) unless otherwise specified (Note 4)
Output Voltage
Symbol
V
O
Input Voltage (unless otherwise noted)
Parameter
Output Voltage
T
J
= 25˚C
P
D
≤
15W, 5 mA
≤
I
O
≤
1A
V
MIN
≤
V
IN
≤
V
MAX
∆V
O
Line Regulation
I
O
= 500 mA
∆V
IN
T
J
= 25˚C
∆V
IN
T
J
= 25˚C
Over Temperature
∆V
IN
∆V
O
Load Regulation
T
J
= 25˚C
5 mA
≤
I
O
≤
1.5A
250 mA
≤
I
O
≤
750
mA
Over Temperature,
5 mA
≤
I
O
≤
1A
I
Q
Quiescent
Current
Quiescent
Current
Change
T
J
= 25˚C
Over Temperature
∆I
Q
5 mA
≤
I
O
≤
1A
T
J
= 25˚C, I
O
= 1A
V
MIN
≤
V
IN
≤
V
MAX
I
O
= 500 mA
V
MIN
≤
V
IN
≤
V
MAX
V
N
Output Noise
Voltage
Ripple Rejection
T
A
= 25˚C, 10 Hz
≤
f
≤
100 kHz
T
J
= 25˚C, f = 120 Hz, I
O
= 1A
or f = 120 Hz, I
O
= 500 mA,
Over Temperature,
V
MIN
≤
V
IN
≤
V
MAX
R
O
Dropout Voltage
Output
Resistance
Short-Circuit
Current
T
J
= 25˚C, I
O
= 1A
f = 1 kHz
T
J
= 25˚C
(8
≤
V
IN
≤
18)
2.0
8
2.1
(15
≤
V
IN
≤
25)
2.0
18
1.5
(18.5
≤
V
IN
≤
28.5)
2.0
19
1.2
V
V
mΩ
A
68
68
40
80
61
61
0.5
0.8
(7.5
≤
V
IN
≤
20)
0.8
(8
≤
V
IN
≤
25)
75
72
60
60
6
6.5
0.5
0.8
(14.8
≤
V
IN
≤
27)
0.8
(15
≤
V
IN
≤
30)
90
70
6
6.5
0.5
0.8
(17.9
≤
V
IN
≤
30)
0.8
(17.9
≤
V
IN
≤
30)
6
6.5
mA
mA
mA
mA
V
mA
V
µV
dB
dB
10
3
Conditions
4.9
4.8
5V
10V
Min Typ Max
5
5.1
5.2
10
(7.5
≤
V
IN
≤
20)
10
4
12
(8
≤
V
IN
≤
12)
25
15
25
12
(7.5
≤
V
IN
≤
20)
4
Min
11.75
11.5
12V
19V
Typ Max
12.5
18
(14.8
≤
V
IN
≤
27)
18
9
30
(16
≤
V
IN
≤
22)
32
19
60
12
(14.5
≤
V
IN
≤
27)
4
Min
14.4
12 12.25 14.7
15V
23V
Typ Max
15
15.3
15.6
22
(17.9
≤
V
IN
≤
30)
22
10
30
(20
≤
V
IN
≤
26)
35
21
75
(17.5
≤
V
IN
≤
30)
V
V
V
mV
V
mV
V
mV
mV
V
mV
mV
mV
Units
(7.5
≤
V
IN
≤
20)
(14.8
≤
V
IN
≤
27)
(17.9
≤
V
IN
≤
30)
3
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LM340/LM78XX
LM340A Electrical Characteristics
I
OUT
Output Voltage
Symbol
(Continued)
= 1A, 0˚C
≤
T
J
≤
+ 125˚C (LM340A) unless otherwise specified (Note 4)
5V
10V
Min Typ Max
2.4
−0.6
Min
12V
19V
Typ Max
2.4
−1.5
Min
15V
23V
Typ Max
2.4
−1.8
A
mV/˚C
Units
Input Voltage (unless otherwise noted)
Parameter
Peak Output
Current
Average TC of
V
O
T
J
= 25˚C
Min, T
J
= 0˚C, I
O
= 5 mA
T
J
= 25˚C
7.5
14.5
17.5
V
Conditions
V
IN
Input Voltage
Required to
Maintain
Line Regulation
LM140 Electrical Characteristics
−55˚C
≤
T
J
≤
+150˚C unless otherwise specified
Output Voltage
Symbol
V
O
(Note 4)
5V
10V
Min Typ Max
4.8
4.75
5
5.2
5.25
Min
11.5
11.4
12V
19V
12
12.5 14.4
12.6 14.25
15V
23V
15
Units
15.6
15.75
V
V
V
Input Voltage (unless otherwise noted)
Parameter
Output Voltage
Conditions
T
J
= 25˚C, 5 mA
≤
I
O
≤
1A
P
D
≤
15W, 5 mA
≤
I
O
≤
1A
V
MIN
≤
V
IN
≤
V
MAX
Typ Max Min Typ Max
(8
≤
V
IN
≤
20)
3
50
(15.5
≤
V
IN
≤
27)
4
120
(18.5
≤
V
IN
≤
30)
4
(17.5
≤
V
IN
≤
30)
(18.5
≤
V
IN
≤
30)
(17.7
≤
V
IN
≤
30)
75
(20
≤
V
IN
≤
26)
12
75
∆V
O
Line Regulation
I
O
= 500 mA
T
J
= 25˚C
∆V
IN
−55˚C
≤
T
J
≤
+150˚C
∆V
IN
150 mV
V
(7
≤
V
IN
≤
25)
50
(8
≤
V
IN
≤
20)
50
(7.5
≤
V
IN
≤
20)
25
(8
≤
V
IN
≤
12)
10
50
25
50
6
7
0.5
0.8
(8
≤
V
IN
≤
20)
0.8
(8
≤
V
IN
≤
25)
40
(14.5
≤
V
IN
≤
30)
120
(15
≤
V
IN
≤
27)
120
(14.6
≤
V
IN
≤
27)
60
(16
≤
V
IN
≤
22)
12
120
60
120
6
7
0.5
0.8
(15
≤
V
IN
≤
27)
0.8
(15
≤
V
IN
≤
30)
75
150 mV
V
I
O
≤
1A
T
J
= 25˚C
∆V
IN
−55˚C
≤
T
J
≤
+150˚C
∆V
IN
150 mV
V
mV
V
mV
∆V
O
Load Regulation
T
J
= 25˚C
5 mA
≤
I
O
≤
1.5A
250 mA
≤
I
P
≤
750
mA
150 mV
−55˚C
≤
T
J
≤
+150˚C,
5 mA
≤
I
O
≤
1A
I
Q
∆I
Q
Quiescent Current
Quiescent Current
Change
I
O
≤
1A
T
J
= 25˚C
−55˚C
≤
T
J
≤
+150˚C
5 mA
≤
I
O
≤
1A
T
J
= 25˚C, I
O
≤
1A
V
MIN
≤
V
IN
≤
V
MAX
I
O
= 500 mA, −55˚C
≤
T
J
≤
+150˚C
V
MIN
≤
V
IN
≤
V
MAX
V
N
Output Noise
Voltage
T
A
= 25˚C, 10 Hz
≤
f
≤
100 kHz
150 mV
6
7
0.5
0.8
(18.5
≤
V
IN
≤
30)
0.8
(18.5
≤
V
IN
≤
30)
90
mA
mA
mA
mA
V
mA
V
µV
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4
LM340/LM78XX
LM140 Electrical Characteristics
−55˚C
≤
T
J
≤
+150˚C unless otherwise specified
Output Voltage
Symbol
(Note 4) (Continued)
5V
10V
Min Typ Max
68
68
(8
≤
V
IN
≤
18)
2.0
8
2.1
2.4
−0.6
80
Min
61
61
(15
≤
V
IN
≤
25)
2.0
18
1.5
2.4
−1.5
12V
19V
72
60
60
(18.5
≤
V
IN
≤
28.5)
2.0
19
1.2
2.4
−1.8
15V
23V
70
Units
dB
dB
V
V
mΩ
A
A
mV/˚C
Input Voltage (unless otherwise noted)
Parameter
Ripple Rejection
or
f = 120 Hz
I
O
≤
500 mA,
−55˚C
≤
T
J
≤+150˚C
V
MIN
≤
V
IN
≤
V
MAX
Conditions
I
O
≤
1A, T
J
= 25˚C
Typ Max Min Typ Max
R
O
Dropout Voltage
Output Resistance
Short-Circuit
Current
Peak Output
Current
Average TC of
V
OUT
T
J
= 25˚C, I
O
= 1A
f = 1 kHz
T
J
= 25˚C
T
J
= 25˚C
0˚C
≤
T
J
≤
+150˚C, I
O
= 5 mA
T
J
= 25˚C, I
O
≤
1A
7.5
V
IN
Input Voltage
Required to
Maintain
Line Regulation
14.6
17.7
V
LM340 Electrical Characteristics
0˚C
≤
T
J
≤
+125˚C unless otherwise specified
Output Voltage
Symbol
V
O
(Note 4)
5V
10V
4.8
4.75
5
5.2
11.5
12V
19V
12
12.5 14.4
12.6 14.25
15V
23V
15
15.6
15.75
Units
V
V
V
mV
V
mV
V
mV
V
mV
V
mV
mV
mV
mA
mA
mA
1.0
mA
Input Voltage (unless otherwise noted)
Parameter
Output Voltage
Conditions
T
J
= 25˚C, 5 mA
≤
I
O
≤
1A
P
D
≤
15W, 5 mA
≤
I
O
≤
1A
V
MIN
≤
V
IN
≤
V
MAX
Min Typ Max Min Typ Max Min Typ Max
5.25 11.4
(7.5
≤
V
IN
≤
20)
3
50
(14.5
≤
V
IN
≤
27)
4
120
(14.5
≤
V
IN
≤
30)
120
(15
≤
V
IN
≤
27)
120
(14.6
≤
V
IN
≤
27)
60
(16
≤
V
IN
≤
22)
12
120
60
120
8
8.5
0.5
(17.5
≤
V
IN
≤
30)
4
150
∆V
O
Line Regulation
I
O
= 500 mA T
J
= 25˚C
∆V
IN
0˚C
≤
T
J
≤
+125˚C
∆V
IN
I
O
≤
1A
T
J
= 25˚C
∆V
IN
0˚C
≤
T
J
≤
+125˚C
∆V
IN
(7
≤
V
IN
≤
25)
50
(8
≤
V
IN
≤
20)
50
(7.5
≤
V
IN
≤
20)
25
(8
≤
V
IN
≤
12)
10
50
25
50
8
8.5
0.5
1.0
(17.5
≤
V
IN
≤
30)
150
(18.5
≤
V
IN
≤
30)
150
(17.7
≤
V
IN
≤
30)
75
(20
≤
V
IN
≤
26)
12
150
75
150
8
8.5
0.5
∆V
O
Load Regulation
T
J
= 25˚C
5 mA
≤
I
O
≤
1.5A
250 mA
≤
I
O
≤
750 mA
5 mA
≤
I
O
≤
1A, 0˚C
≤
T
J
≤
+125˚C
I
Q
∆I
Q
Quiescent Current
Quiescent Current
Change
I
O
≤
1A
T
J
= 25˚C
0˚C
≤
T
J
≤
+125˚C
5 mA
≤
I
O
≤
1A
T
J
= 25˚C, I
O
≤
1A
1.0
5
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