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
nLM78L05 in micro SMD package
nOutput voltage tolerances of ±5%over the temperature
range
nOutput current of 100 mA
nInternal thermal overload protection
nOutput transistor safe area protection
nInternal short circuit current limit
nAvailable in plastic TO-92 and plastic SO-8 low profile
packages
nNo external components
nOutput 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-Terminal 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
1mAI
O
40 mA
(Note 3) 4.75 5.25
1mAI
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
1mAI
O
40 mA 5 30
I
Q
Quiescent Current 3 5 mAI
Q
Quiescent Current Change 8V V
IN
20V 1.0
1mAI
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
=5mA −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
1mAI
O
40 mA
(Note 3) 5.9 6.5
1mAI
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
1mAI
O
40 mA 6 40
LM78LXX Series
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LM78L62AC (Continued)
Unless otherwise specified, V
IN
=12V
Symbol Parameter Conditions Min Typ Max Units
I
Q
Quiescent Current 2 5.5 mAI
Q
Quiescent Current Change 8V V
IN
20V 1.5
1mAI
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
=5mA −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
1mAI
O
40 mA
(Note 3) 7.8 8.6
1mAI
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
1mAI
O
40 mA 8 40
I
Q
Quiescent Current 2 5.5 mAI
Q
Quiescent Current Change 12V V
IN
23V 1.5
1mAI
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
=5mA −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
1mAI
O
40 mA
(Note 3) 8.55 9.45
1mAI
O
70 mA
(Note 3) 8.55 9.45
LM78LXX Series
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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
1mAI
O
40 mA 10 45
I
Q
Quiescent Current 2 5.5 mAI
Q
Quiescent Current Change 11.5V V
IN
24V 1.5
1mAI
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
=5mA −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
1mAI
O
40 mA
(Note 3) 11.4 12.6
1mAI
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
1mAI
O
40 mA 10 50
I
Q
Quiescent Current 3 5 mAI
Q
Quiescent Current Change 16V V
IN
27V 1
1mAI
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
=5mA −1.0 mV/˚C
V
IN
(Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation 13.7 14.5 V
LM78LXX Series
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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
1mAI
O
40 mA
(Note 3) 14.25 15.75
1mAI
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
1mAI
O
40 mA 12 75
I
Q
Quiescent Current 3 5 mAI
Q
Quiescent Current Change 20V V
IN
30V 1
1mAI
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
=5mA −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 kin 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:
ZPackage: θJC =60 ˚C/W, =θJA =230 ˚C/W
MPackage: θJA =180 ˚C/W
micro SMD Package: θJA =230.9˚C/W
LM78LXX Series
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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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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
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Typical Applications (Continued)
Adjustable Output Regulator
DS007744-9
VOUT =5V + (5V/R1 + IQ)R2
5V/R1 >3I
Q
, load regulation (Lr)[(R1 + R2)/R1] (Lrof LM78L05)
Current Regulator
DS007744-10
IOUT =(VOUT/R1) + IQ
>IQ=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%0IL250 mA pulsed with tON =50 ms.
±15V, 100 mA Dual Power Supply
DS007744-12
*Solid tantalum.
LM78LXX Series
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Typical Applications (Continued)
Variable Output Regulator 0.5V-18V
DS007744-13
*Solid tantalum.
VOUT =VG+5V,R1=(−VIN/IQ LM78L05)
VOUT =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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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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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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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:
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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.
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www.national.com
LM78LXX Series 3-Terminal Positive Regulators
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.