LM7805.pdf

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LM78xx_LM78xxA.fm
March 2008
LM78XX/LM78XXA
3-Terminal 1A Positive Voltage Regulator
Features
General Description
■
Output Current up to 1A
The LM78XX series of three terminal positive regulators
are available in the TO-220 package and with several
fixed output voltages, making them useful in a wide
range of applications. Each type employs internal current
limiting, thermal shut down and safe operating area pro-
tection, making it essentially indestructible. If adequate
heat sinking is provided, they can deliver over 1A output
current. Although designed primarily as fixed voltage
regulators, these devices can be used with external com-
ponents to obtain adjustable voltages and currents.
■
Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24
■
Thermal Overload Protection
■
Short Circuit Protection
■
Output Transistor Safe Operating Area Protection
Ordering Information
Product Number
Output Voltage Tolerance
Package
Operating Temperature
LM7805CT
±
4%
TO-220
-40°C to +125°C
LM7806CT
LM7808CT
LM7809CT
LM7810CT
LM7812CT
LM7815CT
LM7818CT
LM7824CT
LM7805ACT
±
2%
0°C to +125°C
LM7806ACT
LM7808ACT
LM7809ACT
LM7810ACT
LM7812ACT
LM7815ACT
LM7818ACT
LM7824ACT
©2006 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0
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Block Diagram
Input
1
Series Pass
Element
Output
3
Current
Generator
SOA
Protection
Starting
Circuit
Reference
Voltage
Error
Amplifier
Thermal
Protection
GND
2
Figure 1.
Pin Assignment
TO-220
GND
1
1. Input
2. GND
3. Output
Figure 2.
Absolute Maximum Ratings
Absolute maximum ratings are those values beyond which damage to the device may occur. The datasheet
specifications should be met, without exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. Fairchild does not recommend operation outside datasheet
specifications.
Symbol
Parameter
Value
Unit
V
I
Input Voltage
V
O
= 5V to 18V
35
V
V
O
= 24V
40
V
R
θ
JC
Thermal Resistance Junction-Cases (TO-220)
5
°C/W
R
θ
JA
Thermal Resistance Junction-Air (TO-220)
65
°C/W
T
OPR
Operating Temperature
Range
LM78xx
-40 to +125
°C
LM78xxA
0 to +125
T
STG
Storage Temperature Range
-65 to +150
°C
LM78XX/LM78XXA Rev. 1.0
2
www.fairchildsemi.com
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Electrical Characteristics (LM7805)
Refer to the test circuits. -40°C
<
T
J
<
125°C, I
O
= 500mA, V
= 10V, C
= 0.1
µ
F, unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= +25°C
4.8
5.0
5.2
V
5mA
≤
I
O
≤
1A, P
O
≤
15W,
4.75
5.0
5.25
V
= 7V to 20V
I
Regline Line Regulation
(1)
T
J
= +25°C V
O
= 7V to 25V
–
4.0
100
mV
V
= 8V to 12V
–
1.6
50.0
Regload Load Regulation
(1)
T
J
= +25°C I
O
= 5mA to 1.5A
–
9.0
100
mV
I
O
= 250mA to 750mA
–
4.0
50.0
I
Q
Quiescent Current
T
J
= +25°C
–
5.0
8.0
mA
∆
I
Q
Quiescent Current Change I
O
= 5mA to 1A
–
0.03
0.5
mA
V
I
= 7V to 25V
–
0.3
1.3
∆
V
O
/
∆
T Output Voltage Drift
(2)
I
O
= 5mA
–
-0.8
–
mV/°C
V
N
Output Noise Voltage
f = 10Hz to 100kHz, T
A
= +25°C
–
42.0
–
µ
V/V
O
RR
Ripple Rejection
(2)
f = 120Hz, V
O
= 8V to 18V
62.0
73.0
–
dB
V
DROP
Dropout Voltage
I
O
= 1A, T
J
= +25°C
–
2.0
–
V
r
O
Output Resistance
(2)
f = 1kHz
–
15.0
–
m
Ω
I
SC
Short Circuit Current
V
I
= 35V, T
A
= +25°C
–
230
–
mA
I
PK
Peak Current
(2)
T
J
= +25°C
–
2.2
–
A
Notes:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
2. These parameters, although guaranteed, are not 100% tested in production.
LM78XX/LM78XXA Rev. 1.0
3
www.fairchildsemi.com
I
I
I
274677390.004.png
Electrical Characteristics (LM7806)
(Continued)
Refer to the test circuits. -40°C
<
T
J
<
125°C, I
O
= 500mA, V
= 11V, C
= 0.33
µ
F, C
O
= 0.1
µ
F, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ.
Max.
Unit
V
O
Output Voltage
T
J
= +25°C
5.75
6.0
6.25
V
5mA
≤
I
O
≤
1A, P
O
≤
15W,
5.7
6.0
6.3
V
= 8.0V to 21V
I
Regline Line Regulation
(3)
T
J
= +25°C V
= 8V to 25V
–
5.0
120
mV
V
= 9V to 13V
–
1.5
60.0
Regload Load Regulation
(3)
T
J
= +25°C I
O
= 5mA to 1.5A
–
9.0
120
mV
O
= 250mA to 750mA
–
3.0
60.0
I
Q
Quiescent Current
T
J
= +25°C
–
5.0
8.0
mA
∆
I
Q
Quiescent Current
Change
O
= 5mA to 1A
–
–
0.5
mA
V
I
= 8V to 25V
–
–
1.3
∆
V
O
/
∆
T Output Voltage Drift
(4)
O
= 5mA
–
-0.8
–
mV/°C
V
N
Output Noise Voltage f = 10Hz to 100kHz, T
A
= +25°C
–
45.0
–
µ
V/V
O
RR
Ripple Rejection
(4)
f = 120Hz, V
O
= 8V to 18V
62.0
73.0
–
dB
V DROP Dropout Voltage
I O = 1A, T J = +25°C
–
2.0
–
V
r O
Output Resistance (4)
f = 1kHz
–
19.0
–
m Ω
I SC
Short Circuit Current
V I = 35V, T A = +25°C
–
250
–
mA
I PK
Peak Current (4)
T J = +25°C
–
2.2
–
A
Notes:
3. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
4. These parameters, although guaranteed, are not 100% tested in production.
LM78XX/LM78XXA Rev. 1.0
4
www.fairchildsemi.com
I
I
I
I
I
I
I
274677390.005.png
Electrical Characteristics (LM7808) (Continued)
Refer to the test circuits. -40°C
<
T J
<
125°C, I O = 500mA, V I = 14V, C I = 0.33
µ
F, C O = 0.1
µ
F, unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
V O
Output Voltage
T J = +25°C
7.7
8.0
8.3
V
5mA ≤ I O ≤ 1A, P O ≤ 15W,
V I = 10.5V to 23V
7.6
8.0
8.4
Regline Line Regulation (5)
T J = +25°C V I = 10.5V to 25V
–
5.0
160
mV
V I = 11.5V to 17V
–
2.0
80.0
Regload Load Regulation (5)
T J = +25°C I O = 5mA to 1.5A
–
10.0
160
mV
I O = 250mA to 750mA
–
5.0
80.0
I Q
Quiescent Current
T J = +25°C
–
5.0
8.0
mA
∆ I Q
Quiescent Current Change I O = 5mA to 1A
–
0.05
0.5
mA
V I = 10.5V to 25V
–
0.5
1.0
∆ V O / ∆ T Output Voltage Drift (6)
I O = 5mA
–
-0.8
–
mV/°C
V N
Output Noise Voltage
f = 10Hz to 100kHz, T A = +25°C
–
52.0
–
µ V/V O
RR
Ripple Rejection (6)
f = 120Hz, V O = 11.5V to 21.5V
56.0
73.0
–
dB
V DROP Dropout Voltage
I O = 1A, T J = +25°C
–
2.0
–
V
r O
Output Resistance (6)
f = 1kHz
–
17.0
–
m Ω
I SC
Short Circuit Current
V I = 35V, T A = +25°C
–
230
–
mA
I PK
Peak Current (6)
T J = +25°C
–
2.2
–
A
Notes:
5. Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
6. These parameters, although guaranteed, are not 100% tested in production.
LM78XX/LM78XXA Rev. 1.0
5
www.fairchildsemi.com
274677390.006.png

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