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 regu-
lation. 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
deliver 100mA output current. Current limiting is included to
limit the peak output current to a safe value. Safe area
protection for the output transistors is provided to limit inter-
nal power dissipation. If internal power dissipation becomes
too high for the heat sinking provided, the thermal shutdown
circuit 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 100mA
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
n
See AN-1112 for micro SMD considerations
Connection Diagrams
SO-8 Plastic (M)
(Narrow Body)
00774402
Top View
8-Bump micro SMD
00774424
Top View
(Bump Side Down)
(TO-92)
Plastic Package (Z)
00774403
Bottom View
micro SMD Marking Orientation
00774433
Top View
May 2003
LM78LXX
Series
3-T
erminal
Positive
Regulators
2003 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
-65C to +150C
ESD Susceptibility (Note 2)
1kV
Operating Junction Temperature
SO-8, TO-92
0C to 125C
micro SMD
-40C to 85C
Soldering Information
Infrared or Convection (20 sec.)
235C
Wave Soldering (10 sec.)
260C (lead time)
LM78LXX Electrical Characteristics
Limits in standard typeface are for T
J
= 25C, Bold typeface
applies over 0C to 125C for SO-8 and TO-92 packages, and -40C to 85C for micro SMD package. Limits are guaran-
teed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless other-
wise specified: I
O
= 40mA, C
I
= 0.33F, C
O
= 0.1F.
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
1mA
I
O
40mA
(Note 3)
4.75
5.25
1mA
I
O
70mA
(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
1mA
I
O
100mA
20
60
1mA
I
O
40mA
5
30
I
Q
Quiescent Current
3
5
mA
I
Q
Quiescent Current Change
8V
V
IN
20V
1.0
1mA
I
O
40mA
0.1
V
n
Output Noise Voltage
f = 10 Hz to 100 kHz
(Note 4)
40
V
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
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
1mA
I
O
40mA
(Note 3)
5.9
6.5
1mA
I
O
70mA
(Note 3)
5.9
6.5
LM78LXX
Series
www.national.com
2
LM78LXX Electrical Characteristics
Limits in standard typeface are for T
J
= 25C, Bold typeface
applies over 0C to 125C for SO-8 and TO-92 packages, and -40C to 85C for micro SMD package. Limits are
guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless
otherwise specified: I
O
= 40mA, C
I
= 0.33F, C
O
= 0.1F. (Continued)
LM78L62AC
(Continued)
Unless otherwise specified, V
IN
= 12V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
O
Line Regulation
8.5V
V
IN
20V
65
175
mV
9V
V
IN
20V
55
125
V
O
Load Regulation
1mA
I
O
100mA
13
80
1mA
I
O
40mA
6
40
I
Q
Quiescent Current
2
5.5
mA
I
Q
Quiescent Current Change
8V
V
IN
20V
1.5
1mA
I
O
40mA
0.1
V
n
Output Noise Voltage
f = 10 Hz to 100 kHz
(Note 4)
50
V
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
1mA
I
O
40mA
(Note 3)
7.8
8.6
1mA
I
O
70mA
(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
1mA
I
O
100mA
15
80
1mA
I
O
40mA
8
40
I
Q
Quiescent Current
2
5.5
mA
I
Q
Quiescent Current Change
12V
V
IN
23V
1.5
1mA
I
O
40mA
0.1
V
n
Output Noise Voltage
f = 10 Hz to 100 kHz
(Note 4)
60
V
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
LM78LXX
Series
www.national.com
3
LM78LXX Electrical Characteristics
Limits in standard typeface are for T
J
= 25C, Bold typeface
applies over 0C to 125C for SO-8 and TO-92 packages, and -40C to 85C for micro SMD package. Limits are
guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless
otherwise specified: I
O
= 40mA, C
I
= 0.33F, C
O
= 0.1F. (Continued)
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
1mA
I
O
40mA
(Note 3)
8.55
9.45
1mA
I
O
70mA
(Note 3)
8.55
9.45
V
O
Line Regulation
11.5V
V
IN
24V
100
200
mV
13V
V
IN
24V
90
150
V
O
Load Regulation
1mA
I
O
100mA
20
90
1mA
I
O
40mA
10
45
I
Q
Quiescent Current
2
5.5
mA
I
Q
Quiescent Current Change
11.5V
V
IN
24V
1.5
1mA
I
O
40mA
0.1
V
n
Output Noise Voltage
70
V
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
1mA
I
O
40mA
(Note 3)
11.4
12.6
1mA
I
O
70mA
(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
1mA
I
O
100mA
30
100
1mA
I
O
40mA
10
50
I
Q
Quiescent Current
3
5
mA
I
Q
Quiescent Current Change
16V
V
IN
27V
1
1mA
I
O
40mA
0.1
V
n
Output Noise Voltage
80
V
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
LM78LXX
Series
www.national.com
4
LM78LXX Electrical Characteristics
Limits in standard typeface are for T
J
= 25C, Bold typeface
applies over 0C to 125C for SO-8 and TO-92 packages, and -40C to 85C for micro SMD package. Limits are
guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless
otherwise specified: I
O
= 40mA, C
I
= 0.33F, C
O
= 0.1F. (Continued)
LM78L12AC
(Continued)
Unless otherwise specified, V
IN
= 19V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IN
(Min)
Minimum Value of Input Voltage
Required to Maintain Line Regulation
13.7
14.5
V
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
1mA
I
O
40mA
(Note 3)
14.25
15.75
1mA
I
O
70mA
(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
1mA
I
O
100mA
35
150
1mA
I
O
40mA
12
75
I
Q
Quiescent Current
3
5
mA
I
Q
Quiescent Current Change
20V
V
IN
30V
1
1mA
I
O
40mA
0.1
V
n
Output Noise Voltage
90
V
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 k
in series with 100pF.
Note 3: Power dissipation
0.75W.
Note 4: Recommended minimum load capacitance of 0.01F to limit high frequency noise.
Note 5: Typical thermal resistance values for the packages are:
Z Package:
JC
= 60 C/W, =
JA
= 230 C/W
M Package:
JA
= 180 C/W
micro SMD Package:
JA
= 230.9C/W
LM78LXX
Series
www.national.com
5
PDF 
ZIP