LM78LXX Series
3-Terminal Positive Regulators
General Description
The LM78LXX series of three terminal positive regulators is
available with several fixed output voltages making them
useful in a wide range of applications. When used as a zener
diode/resistor combination replacement, the LM78LXX usu-
ally results in an effective output impedance improvement of
two orders of magnitude, and lower quiescent current. These
regulators can provide local on card regulation, eliminating
the distribution problems associated with single point regula-
tion. The voltages available allow the LM78LXX to be used in
logic systems, instrumentation, HiFi, and other solid state
electronic equipment.
The LM78LXX is available in the plastic TO-92 (Z) package,
the plastic SO-8 (M) package and a chip sized package
(8-Bump micro SMD) using National’s micro SMD package
technology. With adequate heat sinking the regulator can de-
liver 100 mA output current. Current limiting is included to
limit the peak output current to a safe value. Safe area pro-
tection for the output transistors is provided to limit internal
power dissipation. If internal power dissipation becomes too
high for the heat sinking provided, the thermal shutdown cir-
cuit takes over preventing the IC from overheating.
Features
n
LM78L05 in micro SMD package
n
Output voltage tolerances of
±
5% over the temperature
range
n
Output current of 100 mA
n
Internal thermal overload protection
n
Output transistor safe area protection
n
Internal short circuit current limit
n
Available in plastic TO-92 and plastic SO-8 low profile
packages
n
No external components
n
Output voltages of 5.0V, 6.2V, 8.2V, 9.0V, 12V, 15V
Connection Diagrams
SO-8 Plastic (M)
(Narrow Body)
DS007744-2
Top View
8-Bump micro SMD
DS007744-24
Top View
(Bump Side Down)
(TO-92)
Plastic Package (Z)
DS007744-3
Bottom View
micro SMD Marking Orientation
DS007744-33
Top View
January 2000
LM78LXX
Series
3-T
erminal
Positive
Regulators
© 2000 National Semiconductor Corporation
DS007744
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.
Power Dissipation (Note 5)
Internally Limited
Input Voltage
35V
Storage Temperature
−65˚C to +150˚C
Operating Junction Temperature
SO-8
0˚C to 125˚C
micro SMD
−40˚C to 85˚C
Soldering Information
Infrared or Convection (20 sec.)
235˚C
Wave Soldering (10 sec.)
260˚C (lead time)
ESD Susceptibility (Note 2)
1kV
LM78LXX Electrical Characteristics
Limits in standard typeface are for T
J
= 25˚C, Bold typeface ap-
plies over 0˚C to 125˚C for SO-8 package and −40˚C to 85˚C for micro SMD package. Limits are guaranteed by produc-
tion testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: I
O
= 40 mA, C
I
= 0.33 µF, C
O
= 0.1 µF.
LM78L05
Unless otherwise specified, V
IN
= 10V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage
4.8
5
5.2
V
7V
≤
V
IN
≤
20V
1 mA
≤
I
O
≤
40 mA
(Note 3)
4.75
5.25
1 mA
≤
I
O
≤
70 mA
(Note 3)
4.75
5.25
∆
V
O
Line Regulation
7V
≤
V
IN
≤
20V
18
75
mV
8V
≤
V
IN
≤
20V
10
54
∆
V
O
Load Regulation
1 mA
≤
I
O
≤
100 mA
20
60
1 mA
≤
I
O
≤
40 mA
5
30
I
Q
Quiescent Current
3
5
mA
∆
I
Q
Quiescent Current Change
8V
≤
V
IN
≤
20V
1.0
1 mA
≤
I
O
≤
40 mA
0.1
V
n
Output Noise Voltage
f = 10 Hz to 100 kHz
(Note 4)
40
µV
Ripple Rejection
f = 120 Hz
8V
≤
V
IN
≤
16V
47
62
dB
I
PK
Peak Output Current
140
mA
Average Output Voltage Tempco
I
O
= 5 mA
−0.65
mV/˚C
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
6.7
7
V
θ
JA
Thermal Resistance
(8-Bump micro SMD)
230.9
˚C/W
LM78L62AC
Unless otherwise specified, V
IN
= 12V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage
5.95
6.2
6.45
V
8.5V
≤
V
IN
≤
20V
1 mA
≤
I
O
≤
40 mA
(Note 3)
5.9
6.5
1 mA
≤
I
O
≤
70 mA
(Note 3)
5.9
6.5
∆
V
O
Line Regulation
8.5V
≤
V
IN
≤
20V
65
175
mV
9V
≤
V
IN
≤
20V
55
125
∆
V
O
Load Regulation
1 mA
≤
I
O
≤
100 mA
13
80
1 mA
≤
I
O
≤
40 mA
6
40
LM78LXX
Series
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2
LM78L62AC
(Continued)
Unless otherwise specified, V
IN
= 12V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
Q
Quiescent Current
2
5.5
mA
∆
I
Q
Quiescent Current Change
8V
≤
V
IN
≤
20V
1.5
1 mA
≤
I
O
≤
40 mA
0.1
V
n
Output Noise Voltage
f = 10 Hz to 100 kHz
(Note 4)
50
µV
Ripple Rejection
f = 120 Hz
10V
≤
V
IN
≤
20V
40
46
dB
I
PK
Peak Output Current
140
mA
Average Output Voltage Tempco
I
O
= 5 mA
−0.75
mV/˚C
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
7.9
V
LM78L82AC
Unless otherwise specified, V
IN
= 14V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage
7.87
8.2
8.53
V
11V
≤
V
IN
≤
23V
1 mA
≤
I
O
≤
40 mA
(Note 3)
7.8
8.6
1 mA
≤
I
O
≤
70 mA
(Note 3)
7.8
8.6
∆
V
O
Line Regulation
11V
≤
V
IN
≤
23V
80
175
mV
12V
≤
V
IN
≤
23V
70
125
∆
V
O
Load Regulation
1 mA
≤
I
O
≤
100 mA
15
80
1 mA
≤
I
O
≤
40 mA
8
40
I
Q
Quiescent Current
2
5.5
mA
∆
I
Q
Quiescent Current Change
12V
≤
V
IN
≤
23V
1.5
1 mA
≤
I
O
≤
40 mA
0.1
V
n
Output Noise Voltage
f = 10 Hz to 100 kHz
(Note 4)
60
µV
Ripple Rejection
f = 120 Hz
12V
≤
V
IN
≤
22V
39
45
dB
I
PK
Peak Output Current
140
mA
Average Output Voltage Tempco
I
O
= 5 mA
−0.8
mV/˚C
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
9.9
V
LM78L09AC
Unless otherwise specified, V
IN
= 15V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage
8.64
9.0
9.36
V
11.5V
≤
V
IN
≤
24V
1 mA
≤
I
O
≤
40 mA
(Note 3)
8.55
9.45
1 mA
≤
I
O
≤
70 mA
(Note 3)
8.55
9.45
LM78LXX
Series
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3
LM78L09AC
(Continued)
Unless otherwise specified, V
IN
= 15V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
∆
V
O
Line Regulation
11.5V
≤
V
IN
≤
24V
100
200
mV
13V
≤
V
IN
≤
24V
90
150
∆
V
O
Load Regulation
1 mA
≤
I
O
≤
100 mA
20
90
1 mA
≤
I
O
≤
40 mA
10
45
I
Q
Quiescent Current
2
5.5
mA
∆
I
Q
Quiescent Current Change
11.5V
≤
V
IN
≤
24V
1.5
1 mA
≤
I
O
≤
40 mA
0.1
V
n
Output Noise Voltage
70
µV
Ripple Rejection
f = 120 Hz
15V
≤
V
IN
≤
25V
38
44
dB
I
PK
Peak Output Current
140
mA
Average Output Voltage Tempco
I
O
= 5 mA
−0.9
mV/˚C
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
10.7
V
LM78L12AC
Unless otherwise specified, V
IN
= 19V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage
11.5
12
12.5
V
14.5V
≤
V
IN
≤
27V
1 mA
≤
I
O
≤
40 mA
(Note 3)
11.4
12.6
1 mA
≤
I
O
≤
70 mA
(Note 3)
11.4
12.6
∆
V
O
Line Regulation
14.5V
≤
V
IN
≤
27V
30
180
mV
16V
≤
V
IN
≤
27V
20
110
∆
V
O
Load Regulation
1 mA
≤
I
O
≤
100 mA
30
100
1 mA
≤
I
O
≤
40 mA
10
50
I
Q
Quiescent Current
3
5
mA
∆
I
Q
Quiescent Current Change
16V
≤
V
IN
≤
27V
1
1 mA
≤
I
O
≤
40 mA
0.1
V
n
Output Noise Voltage
80
µV
Ripple Rejection
f = 120 Hz
15V
≤
V
IN
≤
25
40
54
dB
I
PK
Peak Output Current
140
mA
Average Output Voltage Tempco
I
O
= 5 mA
−1.0
mV/˚C
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
13.7
14.5
V
LM78LXX
Series
www.national.com
4
LM78L15AC
Unless otherwise specified, V
IN
= 23V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Output Voltage
14.4
15.0
15.6
V
17.5V
≤
V
IN
≤
30V
1 mA
≤
I
O
≤
40 mA
(Note 3)
14.25
15.75
1 mA
≤
I
O
≤
70 mA
(Note 3)
14.25
15.75
∆
V
O
Line Regulation
17.5V
≤
V
IN
≤
30V
37
250
mV
20V
≤
V
IN
≤
30V
25
140
∆
V
O
Load Regulation
1 mA
≤
I
O
≤
100 mA
35
150
1 mA
≤
I
O
≤
40 mA
12
75
I
Q
Quiescent Current
3
5
mA
∆
I
Q
Quiescent Current Change
20V
≤
V
IN
≤
30V
1
1 mA
≤
I
O
≤
40 mA
0.1
V
n
Output Noise Voltage
90
µV
Ripple Rejection
f = 120 Hz
18.5V
≤
V
IN
≤
28.5V
37
51
dB
I
PK
Peak Output Current
140
mA
Average Output Voltage Tempco
I
O
= 5 mA
−1.3
mV/˚C
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
16.7
17.5
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
outside of its stated operating conditions.
Note 2: Human body model, 1.5 k
Ω
in series with 100 pF.
Note 3: Power dissipation
≤
0.75W.
Note 4: Recommended minimum load capacitance of 0.01 µF to limit high frequency noise.
Note 5: Typical thermal resistance values for the packages are:
Z Package:
θ
JC
= 60 ˚C/W, =
θ
JA
= 230 ˚C/W
M Package:
θ
JA
= 180 ˚C/W
micro SMD Package:
θ
JA
= 230.9˚C/W
LM78LXX
Series
www.national.com
5
Typical Performance Characteristics
Maximum Average Power
Dissipation (Z Package)
DS007744-14
Peak Output Current
DS007744-16
Dropout Voltage
DS007744-17
Ripple Rejection
DS007744-18
Output Impedance
DS007744-19
Quiescent Current
DS007744-20
Quiescent Current
DS007744-21
LM78LXX
Series
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6
Equivalent Circuit
Typical Applications
LM78LXX
DS007744-7
Fixed Output Regulator
DS007744-8
*
Required if the regulator is located more than 3" from the power supply filter.
*
*See (Note 4) in the electrical characteristics table.
LM78LXX
Series
www.national.com
7
Typical Applications
(Continued)
Adjustable Output Regulator
DS007744-9
V
OUT
= 5V + (5V/R1 + I
Q
) R2
5V/R1
>
3 I
Q
, load regulation (L
r
)
≈
[(R1 + R2)/R1] (L
r
of LM78L05)
Current Regulator
DS007744-10
I
OUT
= (V
OUT
/R1) + I
Q
>
I
Q
= 1.5 mA over line and load changes
5V, 500 mA Regulator with Short Circuit Protection
DS007744-11
*Solid tantalum.
*
*
Heat sink Q1.
*
**
Optional: Improves ripple rejection and transient response.
Load Regulation: 0.6% 0
≤
I
L
≤
250 mA pulsed with t
ON
= 50 ms.
±
15V, 100 mA Dual Power Supply
DS007744-12
*Solid tantalum.
LM78LXX
Series
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8
Typical Applications
(Continued)
Variable Output Regulator 0.5V-18V
DS007744-13
*Solid tantalum.
V
OUT
= V
G
+ 5V, R1 = (−V
IN
/I
Q LM78L05
)
V
OUT
= 5V (R2/R4) for (R2 + R3) = (R4 + R5)
A 0.5V output will correspond to (R2/R4) = 0.1 (R3/R4) = 0.9
LM78LXX
Series
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9
Physical Dimensions
inches (millimeters) unless otherwise noted
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE
NUMBERED COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X
1
IS PACKAGE WIDTH, X
2
IS PACK-
AGE LENGTH AND X
3
IS PACKAGE HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
8-Bump micro SMD
Order Number LM78L05IBP or LM78L05IBPX
NS Package Number BPA08AAA
X
1
= 1.285 X
2
= 1.285 X
3
= 0.7
LM78LXX
Series
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10
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
S.O. Package (M)
Order Number LM78L05ACM, LM78L12ACM or LM78L15ACM
NS Package Number M08A
Molded Offset TO-92 (Z)
Order Number LM78L05ACZ, LM78L09ACZ, LM78L12ACZ,
LM78L15ACZ, LM78L62ACZ or LM78L82ACZ
NS Package Number Z03A
LM78LXX
Series
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11
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
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Email: support@nsc.com
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