LM7805C,LM7812C,LM7815C
LM78XX Series Voltage Regulators
Literature Number: SNOSBR7C
LM78XX
OBSOLETE
October 6, 2011
Series Voltage Regulators
General Description
The LM78XX series of three terminal regulators is available
with several fixed output voltages making them useful in a
wide range of applications. One of these is local on card reg-
ulation, eliminating the distribution problems associated with
single point regulation. The voltages available allow these
regulators to be used in logic systems, instrumentation, HiFi,
and other solid state electronic equipment. Although de-
signed primarily as fixed voltage regulators these devices can
be used with external components to obtain adjustable volt-
ages and currents.
The LM78XX series is available in an aluminum TO-3 pack-
age which will allow over 1.0A load current if adequate heat
sinking is provided. Current limiting is included to limit the
peak output current to a safe value. Safe area protection for
the output transistor is provided to limit internal power dissi-
pation. If internal power dissipation becomes too high for the
heat sinking provided, the thermal shutdown circuit takes over
preventing the IC from overheating.
Considerable effort was expanded to make the LM78XX se-
ries of regulators easy to use and minimize the number of
external components. It is not necessary to bypass the output,
although 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.
For output voltage other than 5V, 12V and 15V the LM117
series provides an output voltage range from 1.2V to 57V.
Features
■Output current in excess of 1A
■Internal thermal overload protection
■No external components required
■Output transistor safe area protection
■Internal short circuit current limit
■Available in the aluminum TO-3 package
Voltage Range
LM7805C 5V
LM7812C 12V
LM7815C 15V
Connection Diagrams
Metal Can Package
TO-3 (K)
Aluminum
774602
Bottom View
Order Number LM7805CK,
LM7812CK or LM7815CK
See NS Package Number KC02A
Plastic Package
TO-220 (T)
774603
Top View
Order Number LM7805CT,
LM7812CT or LM7815CT
See NS Package Number T03B
© 2011 National Semiconductor Corporation 7746 www.national.com
7746 Version 6 Revision 2 Print Date/Time: 2011/10/06 10:52:33
LM78XX Series Voltage Regulators
Schematic Diagram
774601
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LM78XX
Absolute Maximum Ratings (Note 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
(VO = 5V, 12V and 15V) 35V
Internal Power Dissipation (Note 1) Internally Limited
Operating Temperature Range (TA)0°C to +70°C
Maximum Junction Temperature
(K Package) 150°C
(T Package) 150°C
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 sec.)
TO-3 Package K 300°C
TO-220 Package T 230°C
Electrical Characteristics LM78XXC (Note 2)
0°C ≤ TJ ≤ 125°C unless otherwise noted.
Output Voltage 5V 12V 15V
Input Voltage (unless otherwise noted) 10V 19V 23V Units
Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
VOOutput Voltage Tj = 25°C, 5 mA ≤ IO ≤ 1A 4.8 5 5.2 11.5 12 12.5 14.4 15 15.6 V
PD ≤ 15W, 5 mA ≤ IO ≤ 1A 4.75 5.25 11.4 12.6 14.2
5
15.7
5
V
VMIN ≤ VIN ≤ VMAX (7.5 ≤ VIN ≤ 20) (14.5 ≤ VIN ≤ 27) (17.5 ≤ VIN ≤ 30) V
ΔVOLine Regulation IO = 500 mA Tj = 25°C 3 50 4 120 4 150 mV
ΔVIN (7 ≤ VIN ≤ 25) 14.5 ≤ VIN ≤ 30) (17.5 ≤ VIN ≤ 30) V
0°C ≤ Tj ≤ +125°C 50 120 150 mV
ΔVIN (8 ≤ VIN ≤ 20) (15 ≤ VIN ≤ 27) (18.5 ≤ VIN ≤ 30) V
IO ≤ 1A Tj = 25°C 50 120 150 mV
ΔVIN (7.5 ≤ VIN ≤ 20) (14.6 ≤ VIN ≤ 27) (17.7 ≤ VIN ≤ 30) V
0°C ≤ Tj ≤ +125°C 25 60 75 mV
ΔVIN (8 ≤ VIN ≤ 12) (16 ≤ VIN ≤ 22) (20 ≤ VIN ≤ 26) V
ΔVOLoad Regulation Tj = 25°C 5 mA ≤ IO ≤ 1.5A 10 50 12 120 12 150 mV
250 mA ≤ IO ≤ 750
mA
25 60 75 mV
5 mA ≤ IO ≤ 1A, 0°C ≤ Tj ≤ +125°
C
50 120 150 mV
IQQuiescent Current IO ≤ 1A Tj = 25°C 8 8 8 mA
0°C ≤ Tj ≤ +125°C 8.5 8.5 8.5 mA
ΔIQQuiescent Current 5 mA ≤ IO ≤ 1A 0.5 0.5 0.5 mA
Change Tj = 25°C, IO ≤ 1A 1.0 1.0 1.0 mA
VMIN ≤ VIN ≤ VMAX (7.5 ≤ VIN ≤ 20) (14.8 ≤ VIN≤ 27) (17.9 ≤ VIN ≤ 30) V
IO ≤ 500 mA, 0°C ≤ Tj ≤ +125°C 1.0 1.0 1.0 mA
VMIN ≤ VIN ≤ VMAX (7 ≤ VIN ≤ 25) (14.5 ≤ VIN≤ 30) (17.5 ≤ VIN ≤ 30) V
VNOutput Noise
Voltage
TA =25°C, 10 Hz ≤ f ≤ 100 kHz 40 75 90 μV
Ripple Rejection IO ≤ 1A, Tj = 25°C or 62 80 55 72 54 70 dB
f = 120 Hz IO ≤ 500 mA 62 55 54 dB
0°C ≤ Tj ≤ +125°C
VMIN ≤ VIN ≤ VMAX (8 ≤ VIN ≤ 18) (15 ≤ VIN ≤ 25) (18.5 ≤ VIN ≤
28.5)
V
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LM78XX
Output Voltage 5V 12V 15V
Input Voltage (unless otherwise noted) 10V 19V 23V Units
Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
RODropout Voltage Tj = 25°C, IOUT = 1A 2.0 2.0 2.0 V
Output Resistance f = 1 kHz 8 18 19 mΩ
Short-Circuit
Current
Tj = 25°C 2.1 1.5 1.2 A
Peak Output
Current
Tj = 25°C 2.4 2.4 2.4 A
Average TC of VOUT 0°C ≤ Tj ≤ +125°C, IO = 5 mA 0.6 1.5 1.8 mV/°C
VIN Input Voltage
Required to
Maintain
Tj = 25°C, IO ≤ 1A 7.5 14.6 17.7 V
Line Regulation
Note 1: Thermal resistance of the TO-3 package (K, KC) is typically 4°C/W junction to case and 35°C/W case to ambient. Thermal resistance of the TO-220
package (T) is typically 4°C/W junction to case and 50°C/W case to ambient.
Note 2: All characteristics are measured with capacitor across the input of 0.22 μF, and a capacitor across the output of 0.1μF. All characteristics except noise
voltage and ripple rejection ratio are measured using pulse techniques (tw ≤ 10 ms, duty cycle ≤ 5%). Output voltage changes due to changes in internal
temperature must be taken into account separately.
Note 3: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and the test conditions, see
Electrical Characteristics.
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LM78XX
Typical Performance Characteristics
Maximum Average Power Dissipation
774605
Maximum Average Power Dissipation
774606
Peak Output Current
774607
Output Voltage (Normalized to 1V at TJ = 25°C)
774608
Ripple Rejection
774609
Ripple Rejection
774610
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LM78XX
Output Impedance
774611
Dropout Voltage
774612
Dropout Characteristics
774613
Quiescent Current
774614
Quiescent Current
774615
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LM78XX
Physical Dimensions inches (millimeters) unless otherwise noted
Aluminum Metal Can Package (KC)
Order Number LM7805CK, LM7812CK or LM7815CK
NS Package Number KC02A
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LM78XX
TO-220 Package (T)
Order Number LM7805CT, LM7812CT or LM7815CT
NS Package Number T03B
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LM78XX
Notes
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LM78XX
Notes
LM78XX Series Voltage Regulators
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