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National Semiconductor
National Semiconductor

LM7805CK Datasheet

Series Voltage Regulators


LM7805CK Datasheet Preview


May 2000
LM78XX
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
regulation, eliminating the distribution problems associated
with single point regulation. The voltages available allow
these regulators to be used in logic systems, instrumenta-
tion, HiFi, and other solid state electronic equipment. Al-
though designed primarily as fixed voltage regulators these
devices can be used with external components to obtain ad-
justable voltages 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 out-
put, 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.
For output voltage other than 5V, 12V and 15V the LM117
series provides an output voltage range from 1.2V to 57V.
Features
n Output current in excess of 1A
n Internal thermal overload protection
n No external components required
n Output transistor safe area protection
n Internal short circuit current limit
n Available in the aluminum TO-3 package
Voltage Range
LM7805C
LM7812C
LM7815C
5V
12V
15V
Connection Diagrams
Metal Can Package
TO-3 (K)
Aluminum
Plastic Package
TO-220 (T)
DS007746-2
Bottom View
Order Number LM7805CK,
LM7812CK or LM7815CK
See NS Package Number KC02A
DS007746-3
Top View
Order Number LM7805CT,
LM7812CT or LM7815CT
See NS Package Number T03B
© 2000 National Semiconductor Corporation DS007746
www.national.com
Page 1

Schematic
DS007746-1
www.national.com
2
Page 2

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)
Internal Power Dissipation (Note 1)
Operating Temperature Range (TA)
35V
Internally Limited
0˚C to +70˚C
Maximum Junction Temperature
(K Package)
(T Package)
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
TO-3 Package K
TO-220 Package T
150˚C
150˚C
−65˚C to +150˚C
300˚C
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
Symbol
Parameter
Conditions
Min Typ Max Min Typ Max Min Typ Max
VO
Output Voltage
Tj = 25˚C, 5 mA IO 1A
4.8 5 5.2 11.5 12 12.5 14.4 15 15.6
PD 15W, 5 mA IO 1A
4.75
5.25 11.4
12.6 14.25
15.75
VMIN VIN VMAX
(7.5 VIN 20)
(14.5 VIN
27)
(17.5 VIN
30)
VO Line Regulation IO = 500 Tj = 25˚C
mA
3 50
4 120
4 150
VIN
(7 VIN 25) 14.5 VIN 30)
(17.5 VIN
30)
0˚C Tj +125˚C 50 120 150
VIN
(8 VIN 20)
(15 VIN 27)
(18.5 VIN
30)
IO 1A
Tj = 25˚C
VIN
50
(7.5 VIN 20)
120
(14.6 VIN
27)
150
(17.7 VIN
30)
0˚C Tj +125˚C
25
60
75
VO
Load Regulation
Tj = 25˚C
VIN
5 mA IO 1.5A
250 mA IO
750 mA
(8 VIN 12)
10 50
25
(16 VIN 22)
12 120
60
(20 VIN 26)
12 150
75
5 mA IO 1A, 0˚C Tj
+125˚C
50 120 150
IQ
Quiescent Current IO 1A
Tj = 25˚C
888
0˚C Tj +125˚C 8.5 8.5 8.5
IQ Quiescent Current 5 mA IO 1A
Change
Tj = 25˚C, IO 1A
VMIN VIN VMAX
0.5
1.0
(7.5 VIN 20)
0.5
1.0
(14.8 VIN27)
0.5
1.0
(17.9 VIN
30)
IO 500 mA, 0˚C Tj +125˚C
VMIN VIN VMAX
1.0 1.0
(7 VIN 25) (14.5 VIN30)
1.0
(17.5 VIN
30)
VN Output Noise
TA =25˚C, 10 Hz f 100 kHz
40
75
90
Voltage
Ripple Rejection
IO 1A, Tj = 25˚C 62 80
or
55 72
54 70
f = 120 Hz IO 500 mA
62
55
54
0˚C Tj +125˚C
VMIN VIN VMAX
(8 VIN 18)
(15 VIN 25)
(18.5 VIN
28.5)
RO Dropout Voltage Tj = 25˚C, IOUT = 1A
Output Resistance f = 1 kHz
2.0 2.0 2.0
8 18 19
Units
V
V
V
mV
V
mV
V
mV
V
mV
V
mV
mV
mV
mA
mA
mA
mA
V
mA
V
µV
dB
dB
V
V
m
3 www.national.com
Page 3

Electrical Characteristics LM78XXC (Note 2) (Continued)
0˚C TJ 125˚C unless otherwise noted.
Output Voltage
Input Voltage (unless otherwise noted)
Symbol
Parameter
Conditions
Short-Circuit
Current
Tj = 25˚C
Peak Output
Current
Tj = 25˚C
Average TC of
VOUT
0˚C Tj +125˚C, IO = 5 mA
VIN Input Voltage
Required to
Maintain
Tj = 25˚C, IO 1A
Line Regulation
5V 12V 15V
10V 19V 23V
Min Typ Max Min Typ Max Min Typ Max
2.1 1.5 1.2
Units
A
2.4 2.4 2.4 A
0.6 1.5 1.8 mV/˚C
7.5 14.6
17.7
V
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 Elec-
trical Characteristics.
www.national.com
4
Page 4
Part Number LM7805CK
Manufactur National Semiconductor
Description Series Voltage Regulators
Total Page 8 Pages
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