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A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
m
SLVS056B – MAY 1976 – REVISED OCTOBER 1996
3-Terminal Regulators
KC PACKAGE
(TOP VIEW)
Output Current Up to 1.5 A
Internal Thermal Overload Protection
OUTPUT
COMMON
INPUT
High Power Dissipation Capability
Internal Short-Circuit Current Limiting
Output Transistor Safe-Area Compensation
The common terminal is in electrical
contact with the mounting base.
Direct Replacements for Fairchild
m
A7800
Series
TO–220AB
O
description
C
I
This series of fixed-voltage monolithic integrated-
circuit voltage regulators is designed for a wide
range of applications. These applications include
on-card regulation for elimination of noise and
distribution problems associated with single-point
regulation. Each of these regulators can deliver up
to 1.5 A of output current. The internal current
limiting and thermal shutdown features of these
regulators make them essentially immune to
overload. In addition to use as fixed-voltage
regulators, these devices can be used with
external components to obtain adjustable output
voltages and currents and also used as the
power-pass element in precision regulators.
KTE PACKAGE
(TOP VIEW)
OUTPUT
COMMON
INPUT
The common terminal is in electrical
contact with the mounting base.
A7800C series is characterized for
operation over the virtual junction temperature
range of 0
m
O
C
I
°
C to 125
°
C. The
A7805Q and
A7812Q are characterized for operation over the
virtual junction temperature range of – 40
°
C to
125
°
C.
AVAILABLE OPTIONS
PACKAGED DEVICES
T
J
V
O(nom)
(V)
PLASTIC
FLANGE-MOUNT
(KC)
HEAT-SINK
MOUNTED
†
(KTE)
CHIP FORM
(Y)
5
6
8
8.5
10
12
15
18
24
A7805CKC
m
A7806CKC
m
A7805CKTE
m
A7806CKTE
m
A7805Y
m
A7806Y
m
A7808CKC
m
A7885CKC
m
A7810CKC
m
A7808CKTE
m
A7885CKTE
m
A7810CKTE
m
A7808Y
m
A7885Y
m
A7810Y
m
0
°
C to 125
°
C
A7812CKC
m
A7815CKC
m
A7818CKC
m
A7812CKTE
m
A7815CKTE
m
A7818CKTE
m
A7812Y
m
A7815Y
m
A7818Y
m
A7824CKC
A7824CKTE
A7824Y
–40
°
C to 125
°
C
5
12
A7805QKC
m
A7812QKC
A7805QKTE
m
A7812QKTE
—
—
†
The KTE package is also available taped and reeled.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
W
1996, Texas Instruments Incorporated
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
1
The
m
m
V
CHIP FORM
T
m
m
m
m
m
•
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056B – MAY 1976 – REVISED OCTOBER 1996
schematic
INPUT
OUTPUT
COMMON
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
m
•
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
m
SLVS056B – MAY 1976 – REVISED OCTOBER 1996
m
A78xxY chip information
A78xxC. Thermal compression
or ultrasonic bonding may be used on the doped aluminum bonding pads. The chips may be mounted with
conductive epoxy or a gold-silicon preform.
m
BONDING PAD ASSIGNMENTS
(1)
(3)
INPUT
OUTPUT
m
A78xxY
(2)
(3)
(1)
COMMON
90
CHIP THICKNESS: 15 MILS TYPICAL
BONDING PADS: 4
4 MILS MINIMUM
T
J
max = 150
°
C
TOLERANCES ARE
±
10%.
ALL DIMENSIONS ARE IN MILS.
(2)
70
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
These chips, when properly assembled, display characteristics similar to the
×
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056B – MAY 1976 – REVISED OCTOBER 1996
absolute maximum ratings over operating temperature ranges (unless otherwise noted)
†
Input voltage, V
I
:
m
A7824C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation at (or below) T
A
= 25
All others
35 V
°
C (see Note 1)
. . . .
See Disipation Rating Tables
Continuous total power dissipation at (or below) T
C
= 90
°
C (see Note 1)
. . . .
See Disipation Rating Tables
Operating free-air, T
A
, case, T
C
, or virtual junction, T
J
, temperature range
. . . . . . . . . . . . . . . . .
– 40 to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
– 65 to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: For operation above 25
260
°
C
C case temperature, refer to Figure 1 and Figure 2. To avoid exceeding the design maximum
virtual junction temperature, these ratings should not be exceeded. Due to variations in individual device electrical characteristics and
thermal resistance, the built-in thermal overload protection may be activated at power levels slightly above or below the rated dissipation.
°
C free-air or 90
°
DISSIPATION RATING TABLE — FREE-AIR TEMPERATURE
PACKAGE
C
POWER RATING
T
A
3
25
°
DERATING FACTOR
ABOVE T
A
= 25
°
C
C
POWER RATING
°
C
POWER RATING
T
A
= 105
°
C
POWER RATING
T
A
= 125
°
KC
2000 mW
16.0 mW/
C
1280 mW
720 mW
400 mW
KTE
1900 mW
15.2 mW/
°
C
1216 mW
684 mW
380 mW
DISSIPATION RATING TABLE — CASE TEMPERATURE
PACKAGE
T
C
3
90
°
C
POWER RATING
DERATING FACTOR
ABOVE T
C
= 90
°
C
T
A
= 125
°
C
POWER RATING
KC
15000 mW
250.0 mW/
°
C
6250 mW
KTE
14300 mW
238.0 mW/
C
5970 mW
FREE-AIR TEMPERATURE
DISSIPATATION DERATING CURVE
CASE TEMPERATURE
DISSIPATION DERATING CURVE
2000
16
1800
14
1600
12
1400
1200
10
1000
8
800
6
600
4
400
200
Derating factor = 16 mW/
°
C
R
2
Derating factor = 0.25 W/
°
C above 90
°
C
R
q
JA
9
62.5
°
C/W
q
JA
9
4
°
C/W
0
0
25
50
75
100
125
150
25
50
75
100
125
150
T
A
– Free-Air Temperature –
°
C
T
C
– Case Temperature –
°
C
Figure 1
Figure 2
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
m
Storage temperature range, T
stg
T
A
= 70
°
°
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
m
SLVS056B – MAY 1976 – REVISED OCTOBER 1996
recommended operating conditions
MIN MAX UNIT
m
A7805C
7
25
m
A7806C
8
25
m
A7808C
10.5
25
m
A7885C
10.5
25
Input voltage, V
I
l
V
m
A7810C
12.5
28
V
I
m
A7812C
14.5
30
m
A7815C
17.5
30
m
A7818C
21
33
m
A7824C
27
38
Output current, I
O
1.5
A
Operating virtual junction temperature, T
J
m
A7800C Series
0
125
°
C
°
C
m
A7805Q,
m
A7812Q
–40
125
electrical characteristics at specified virtual junction temperature, V
I
= 10 V, I
O
= 500 mA (unless
otherwise noted)
T
J
†
m
A7805C,
m
A7805Q
PARAMETER
TEST CONDITIONS
UNIT
PARAMETER
T
J
†
UNIT
MIN
TYP MAX
25
°
C
4.8
5
5.2
‡
Output voltage
‡
l
I
O
= 5 mA to 1 A,
P
3
15 W
V
I
= 7 V to 20 V,
V
Full range
§
4.75
5.25
V
I
= 7 V to 25 V
3
100
Input voltage regulation
25
°
C
mV
25
°
C
V
I
= 8 V to 12 V
1
50
Ripple rejection
V
I
= 8 V to 18 V,
f = 120 Hz
Full range
§
62
78
dB
Output voltage regulation
I
O
= 5 mA to 1.5 A
15
100
mV
Output voltage regulation
25
°
C
mV
25
°
C
I
O
= 250 mA to 750 mA
5
50
Output resistance
f = 1 kHz
Full range
§
0.017
W
Temperature coefficient of output voltage I
O
= 5 mA
Full range
§
– 1.1
mV/
°
C
Output noise voltage
f = 10 Hz to 100 kHz
25
°
C
40
m
V
Dropout voltage
I
O
= 1 A
25
°
C
2
V
Bias current
25
°
C
4.2
8
mA
Bias current change
V
I
= 7 V to 25 V
Full range
§
1.3
mA
I
O
= 5 mA to 1 A
0.5
C 750 mA
Peak output current 25
°
C 2.2 A
†
Pulse-testing techniques maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into
account separately. All characteristics are measured with a 0.33-
Short-circuit output current
25
°
m
F capacitor across the input and a 0.1-
m
F capacitor across the output.
‡
This specification applies only for dc power dissipation permitted by absolute maximum ratings.
§
Full range virtual junction temperature is 0
°
C to 125
°
C for the
m
A7805C and – 40
°
C to 125
°
C for the
m
A7805Q.
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
5
I
I
I
I
l
l
l
V
V
V
V
V
V
V
Operating virtual junction temperature T
J
TEST CONDITIONS
O
V
Input voltage regulation
mV
Bias current change
Full range
§
mA
•
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