A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
3-Terminal Regulators
D
Output Current up to 1.5 A
D
Internal Thermal-Overload Protection
D
High Power-Dissipation Capability
D
Internal Short-Circuit Current Limiting
D
Output Transistor Safe-Area Compensation
D
Direct Replacements for Fairchild
A7800
Series
description
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
essentially make them 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 can be used as the power-pass element
in precision regulators.
The
A7800C series is characterized for
operation over the virtual junction temperature
range of 0
C to 125
C.
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.
Copyright
1999, Texas Instruments Incorporated
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.
KC PACKAGE
(TOP VIEW)
The COMMON terminal is in electrical
contact with the mounting base.
TO-220AB
OUTPUT
COMMON
INPUT
KTE PACKAGE
(TOP VIEW)
The COMMON terminal is in
electrical contact with the mounting
base.
O
C
I
OUTPUT
COMMON
INPUT
O
C
I
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGED DEVICES
CHIP
TJ
VO(NOM)
(V)
PLASTIC
FLANGE-MOUNT
(KC)
HEAT-SINK
MOUNTED
(KTE)
CHIP
FORM
(Y)
5
A7805CKC
A7805CKTE
A7805Y
6
A7806CKC
A7806CKTE
A7806Y
8
A7808CKC
A7808CKTE
A7808Y
8.5
A7885CKC
A7885CKTE
A7885Y
0
C to 125
C
10
A7810CKC
A7810CKTE
A7810Y
12
A7812CKC
A7812CKTE
A7812Y
15
A7815CKC
A7815CKTE
A7815Y
18
A7818CKC
A7818CKTE
A7818Y
24
A7824CKC
A7824CKTE
A7824Y
The KTE package is only available taped and reeled. Add the suffix R to the device type
(e.g.,
A7805CKTER). Chip forms are tested at 25
C.
schematic
INPUT
OUTPUT
COMMON
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating temperature ranges (unless otherwise noted)
A78xx
UNIT
Input voltage VI
A7824C
40
V
Input voltage, VI
All others
35
V
Virtual junction temperature range, TJ
0 to 150
C
Package thermal impedance
JA (see Notes 1 and 2)
KC package
22
C
Package thermal impedance,
JA (see Notes 1 and 2)
KTE package
23
C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
C
Storage temperature range, Tstg
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.
NOTES:
1. Maximum power dissipation is a function of TJ(max),
JA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) TA)/
JA. Operating at the absolute maximum TJ of 150
C can impact reliability. 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.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
MIN
MAX
UNIT
A7805C
7
25
A7806C
8
25
A7808C
10.5
25
A7885C
10.5
25
Input voltage, VI
A7810C
12.5
28
V
A7812C
14.5
30
A7815C
17.5
30
A7818C
21
33
A7824C
27
38
Output current, IO
1.5
A
Operating virtual junction temperature, TJ
A7800C series
0
125
C
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 10 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7805C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 7 V to 20 V,
25
C
4.8
5
5.2
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
4.75
5.25
V
Input voltage regulation
VI = 7 V to 25 V
25
C
3
100
mV
Input voltage regulation
VI = 8 V to 12 V
25
C
1
50
mV
Ripple rejection
VI = 8 V to 18 V,
f = 120 Hz
0
C to 125
C
62
78
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
15
100
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
5
50
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.017
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
1.1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
40
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.2
8
mA
Bias current change
VI = 7 V to 25 V
0
C to 125
C
1.3
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 11 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7806C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 8 V to 21 V,
25
C
5.75
6
6.25
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
5.7
6.3
V
Input voltage regulation
VI = 8 V to 25 V
25
C
5
120
mV
Input voltage regulation
VI = 9 V to 13 V
25
C
1.5
60
mV
Ripple rejection
VI = 9 V to 19 V,
f = 120 Hz
0
C to 125
C
59
75
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
14
120
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
60
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.019
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
0.8
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
45
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.3
8
mA
Bias current change
VI = 8 V to 25 V
0
C to 125
C
1.3
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
550
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 14 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7808C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 10.5 V to 23 V,
25
C
7.7
8
8.3
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
7.6
8.4
V
Input voltage regulation
VI = 10.5 V to 25 V
25
C
6
160
mV
Input voltage regulation
VI = 11 V to 17 V
25
C
2
80
mV
Ripple rejection
VI = 11.5 V to 21.5 V,
f = 120 Hz
0
C to 125
C
55
72
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
160
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
80
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.016
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
0.8
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
52
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.3
8
mA
Bias current change
VI = 10.5 V to 25 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
450
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 15 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7885C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 11 V to 23.5 V,
25
C
8.15
8.5
8.85
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
8.1
8.9
V
Input voltage regulation
VI = 10.5 V to 25 V
25
C
6
170
mV
Input voltage regulation
VI = 11 V to 17 V
25
C
2
85
mV
Ripple rejection
VI = 11.5 V to 21.5 V,
f = 120 Hz
0
C to 125
C
54
70
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
170
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
85
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.016
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
0.8
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
55
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.3
8
mA
Bias current change
VI = 10.5 V to 25 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
450
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 17 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7810C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 12.5 V to 25 V,
25
C
9.6
10
10.4
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
9.5
10
10.5
V
Input voltage regulation
VI = 12.5 V to 28 V
25
C
7
200
mV
Input voltage regulation
VI = 14 V to 20 V
25
C
2
100
mV
Ripple rejection
VI = 13 V to 23 V,
f = 120 Hz
0
C to 125
C
55
71
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
200
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
100
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.018
W
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
70
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.3
8
mA
Bias current change
VI = 12.5 V to 28 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
400
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 19 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7812C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 14.5 V to 27 V,
25
C
11.5
12
12.5
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
11.4
12.6
V
Input voltage regulation
VI = 14.5 V to 30 V
25
C
10
240
mV
Input voltage regulation
VI = 16 V to 22 V
25
C
3
120
mV
Ripple rejection
VI = 15 V to 25 V,
f = 120 Hz
0
C to 125
C
55
71
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
240
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
120
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.018
W
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
75
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.3
8
mA
Bias current change
VI = 14.5 V to 30 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
350
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 23 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7815C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 17.5 V to 30 V,
25
C
14.4
15
15.6
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
14.25
15.75
V
Input voltage regulation
VI = 17.5 V to 30 V
25
C
11
300
mV
Input voltage regulation
VI = 20 V to 26 V
25
C
3
150
mV
Ripple rejection
VI = 18.5 V to 28.5 V,
f = 120 Hz
0
C to 125
C
54
70
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
300
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
150
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.019
W
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
90
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.4
8
mA
Bias current change
VI = 17.5 V to 30 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
230
mA
Peak output current
25
C
2.1
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 27 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7818C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 21 V to 33 V,
25
C
17.3
18
18.7
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
17.1
18.9
V
Input voltage regulation
VI = 21 V to 33 V
25
C
15
360
mV
Input voltage regulation
VI = 24 V to 30 V
25
C
5
180
mV
Ripple rejection
VI = 22 V to 32 V,
f = 120 Hz
0
C to 125
C
53
69
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
360
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
180
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.022
W
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
110
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.5
8
mA
Bias current change
VI = 21 V to 33 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
200
mA
Peak output current
25
C
2.1
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 33 V, I
O
= 500 mA (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A7824C
UNIT
PARAMETER
TEST CONDITIONS
TJ
MIN
TYP
MAX
UNIT
Output voltage
IO = 5 mA to 1 A,
VI = 27 V to 38 V,
25
C
23
24
25
V
Output voltage
O
,
PD
15 W
I
,
0
C to 125
C
22.8
25.2
V
Input voltage regulation
VI = 27 V to 38 V
25
C
18
480
mV
Input voltage regulation
VI = 30 V to 36 V
25
C
6
240
mV
Ripple rejection
VI = 28 V to 38 V,
f = 120 Hz
0
C to 125
C
50
66
dB
Output voltage regulation
IO = 5 mA to 1.5 A
25
C
12
480
mV
Output voltage regulation
IO = 250 mA to 750 mA
25
C
4
240
mV
Output resistance
f = 1 kHz
0
C to 125
C
0.028
W
Temperature coefficient of output voltage
IO = 5 mA
0
C to 125
C
1.5
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
25
C
170
V
Dropout voltage
IO = 1 A
25
C
2
V
Bias current
25
C
4.6
8
mA
Bias current change
VI = 27 V to 38 V
0
C to 125
C
1
mA
Bias current change
IO = 5 mA to 1 A
0
C to 125
C
0.5
mA
Short-circuit output current
25
C
150
mA
Peak output current
25
C
2.1
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 10 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7805Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
5
V
Input voltage regulation
VI = 7 V to 25 V
3
mV
Input voltage regulation
VI = 8 V to 12 V
1
mV
Ripple rejection
VI = 8 V to 18 V,
f = 120 Hz
78
dB
Output voltage regulation
IO = 5 mA to 1.5 A
15
mV
Output voltage regulation
IO = 250 mA to 750 mA
5
mV
Output resistance
f = 1 kHz
0.017
W
Temperature coefficient of output voltage
IO = 5 mA
1.1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
40
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.2
mA
Short-circuit output current
750
mA
Peak output current
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 11 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7806Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
6
V
Input voltage regulation
VI = 8 V to 25 V
5
mV
Input voltage regulation
VI = 9 V to 13 V
1.5
mV
Ripple rejection
VI = 9 V to 19 V,
f = 120 Hz
75
dB
Output voltage regulation
IO = 5 mA to 1.5 A
14
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.019
W
Temperature coefficient of output voltage
IO = 5 mA
0.8
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
45
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.3
mA
Short-circuit output current
550
mA
Peak output current
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 14 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7808Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
8
V
Input voltage regulation
VI = 10.5 V to 25 V
6
mV
Input voltage regulation
VI = 11 V to 17 V
2
mV
Ripple rejection
VI = 11.5 V to 21.5 V,
f = 120 Hz
72
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.016
W
Temperature coefficient of output voltage
IO = 5 mA
0.8
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
52
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.3
mA
Short-circuit output current
450
mA
Peak output current
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 15 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7885Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
8.5
V
Input voltage regulation
VI = 10.5 V to 25 V
6
mV
Input voltage regulation
VI = 11 V to 17 V
2
mV
Ripple rejection
VI = 11.5 V to 21.5 V,
f = 120 Hz
70
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.016
W
Temperature coefficient of output voltage
IO = 5 mA
0.8
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
55
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.3
mA
Short-circuit output current
450
mA
Peak output current
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 17 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7810Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
10
V
Input voltage regulation
VI = 12.5 V to 28 V
7
mV
Input voltage regulation
VI = 14 V to 20 V
2
mV
Ripple rejection
VI = 13 V to 23 V,
f = 120 Hz
71
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.018
W
Temperature coefficient of output voltage
IO = 5 mA
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
70
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.3
mA
Short-circuit output current
400
mA
Peak output current
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 19 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7812Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
12
V
Input voltage regulation
VI = 14.5 V to 30 V
10
mV
Input voltage regulation
VI = 16 V to 22 V
3
mV
Ripple rejection
VI = 15 V to 25 V,
f = 120 Hz
71
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.018
W
Temperature coefficient of output voltage
IO = 5 mA
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
75
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.3
mA
Short-circuit output current
350
mA
Peak output current
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 23 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7815Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
15
V
Input voltage regulation
VI = 17.5 V to 30 V
11
mV
Input voltage regulation
VI = 20 V to 26 V
3
mV
Ripple rejection
VI = 18.5 V to 28.5 V,
f = 120 Hz
70
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.019
W
Temperature coefficient of output voltage
IO = 5 mA
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
90
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.4
mA
Short-circuit output current
230
mA
Peak output current
2.1
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified virtual junction temperature, V
I
= 27 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7818Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
18
V
Input voltage regulation
VI = 21 V to 33 V
15
mV
Input voltage regulation
VI = 24 V to 30 V
5
mV
Ripple rejection
VI = 22 V to 32 V,
f = 120 Hz
69
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.022
W
Temperature coefficient of output voltage
IO = 5 mA
1
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
110
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.5
mA
Short-circuit output current
200
mA
Peak output current
2.1
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
electrical characteristics at specified virtual junction temperature, V
I
= 33 V, I
O
= 500 mA, T
J
= 25
C
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
A7824Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage
24
V
Input voltage regulation
VI = 27 V to 38 V
18
mV
Input voltage regulation
VI = 30 V to 36 V
6
mV
Ripple rejection
VI = 28 V to 38 V,
f = 120 Hz
66
dB
Output voltage regulation
IO = 5 mA to 1.5 A
12
mV
Output voltage regulation
IO = 250 mA to 750 mA
4
mV
Output resistance
f = 1 kHz
0.028
W
Temperature coefficient of output voltage
IO = 5 mA
1.5
mV/
C
Output noise voltage
f = 10 Hz to 100 kHz
170
V
Dropout voltage
IO = 1 A
2
V
Bias current
4.6
mA
Short-circuit output current
150
mA
Peak output current
2.1
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-
F capacitor across the input and a 0.1-
F capacitor across the output.
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
+VO
+V
0.1
F
0.33
F
A78xx
Figure 1. Fixed-Output Regulator
OUT
IN
G
VO
COM
+
VI
IL
A78xx
Figure 2. Positive Regulator in Negative Configuration (V
I
Must Float)
R1
0.33
F
Input
Output
A78xx
0.1
F
IO
R2
V
O
+
V
xx
)
V
xx
R1
)
I
Q
R2
NOTE A: The following formula is used when Vxx is the nominal output voltage (output to common) of the fixed regulator:
Figure 3. Adjustable-Output Regulator
VO(Reg)
R1
Input
IO
IO = (VO/R1) + IO Bias Current
0.33
F
A78xx
Output
Figure 4. Current Regulator
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056E MAY 1976 REVISED JULY 1999
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
A7815C
0.1
F
1N4001
0.1
F
1N4001
0.33
F
2
F
1N4001
1N4001
VO = 15 V
VO = 15 V
20-V Input
20-V Input
A7915C
1
F
Figure 5. Regulated Dual Supply
operation with a load common to a voltage of opposite polarity
In many cases, a regulator powers a load that is not connected to ground but, instead, is connected to a voltage
source of opposite polarity (e.g., operational amplifiers, level-shifting circuits, etc.). In these cases, a clamp
diode should be connected to the regulator output as shown in Figure 6. This protects the regulator from output
polarity reversals during startup and short-circuit operation.
A78xx
+VO
+VI
VO
1N4001
or
Equivalent
Figure 6. Output Polarity-Reversal-Protection Circuit
reverse-bias protection
Occasionally, the input voltage to the regulator can collapse faster than the output voltage. This can occur, for
example, when the input supply is crowbarred during an output overvoltage condition. If the output voltage is
greater than approximately 7 V, the emitter-base junction of the series-pass element (internal or external) could
break down and be damaged. To prevent this, a diode shunt can be used as shown in Figure 7.
A78xx
+VO
VI
Figure 7. Reverse-Bias-Protection Circuit
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Copyright
1999, Texas Instruments Incorporated
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