MC78XXE
3-Terminal 1A Positive Voltage Regulator
Features
Description
•
•
•
•
•
The MC78XXE series of three terminal positive regulators are available in the D-PAK 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 protection, making it essentially indestructible. If adequate heat
sinking is provided, they can deliver over 1 A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external
components to obtain adjustable voltages and currents.
Output Current up to 1 A
Output Voltages of 5 V, 12 V
Thermal Overload Protection
Short-Circuit Protection
Output Transistor Safe Operating Area Protection
D-PAK
GND
1
1. Input 2. GND 3. Output
Ordering Information
Product Number Marking
Package
Packing Method
MC7805ECDTX
MC7805
TO-252 3L (D-PAK)
Tape and Reel
MC7812ECDTX
MC7812
TO-252 3L (D-PAK)
Tape and Reel
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
Output Voltage
Tolerance
Operating
Temperature
±4%
-40 to +125°C
www.fairchildsemi.com
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
April 2015
SERIES
PASS
ELEMENT
INPUT
1
CURRENT
GENERATOR
STARTING
CIRCUIT
REFERENCE
VOLTAGE
OUTPUT
3
SOA
PROTECTION
ERROR
AMPLIFIER
THERMAL
PROTECTION
GND
2
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
VI
Parameter
Input Voltage
VO = 5 V to 18 V
Value
Unit
35
V
TOPR
Operating Temperature Range
-40 to +125
°C
TSTG
Storage Temperature Range
-65 to +150
°C
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
2
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Block Diagram
Refer to test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI = 10 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
TJ = +25°C
4.80
5.00
5.20
Output Voltage
5.0 mA ≤ IO ≤ 1.0 A, PO ≤ 15 W,
VI = 7 V to 20 V
4.75
5.00
5.25
Regline
Line Regulation(1)
TJ = +25°C
VI = 7 V to 25 V
4
100
VI = 8 V to 12 V
1.6
50
Regload
Load Regulation(1)
TJ = +25°C
IO = 5.0 mA to 1.5 A
9
100
IO = 250 mA to 750 mA
4
50
IQ
Quiescent Current
TJ = +25°C
5
8
IO = 5 mA to 1.0 A
0.03
0.50
VI = 7 V to 25 V
0.3
1.3
-0.8
mV/°C
42
μV
VO
ΔIQ
Quiescent Current Change
ΔVO/ΔT
Output Voltage Drift(2)
IO = 5 mA
VN
Output Noise Voltage
f = 10 Hz to 100 kHz, TA = +25°C
(2)
mV
mV
mA
mA
RR
Ripple Rejection
f = 120 Hz, VO = 8 V to 18 V
73
dB
VDrop
Dropout Voltage
IO = 1 A, TJ = +25°C
2
V
f = 1 kHz
15
mΩ
Resistance(2)
62
V
rO
Output
ISC
Short Circuit Current
VI = 35 V, TA = +25°C
230
mA
IPK
Peak Current(2)
TJ = +25°C
2.2
A
Notes:
1. Load and line regulation are specified at constant junction temperature. Changes in VO 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.
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
3
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (MC7805E)
Refer to test circuit, -40°C < TJ < 125°C, IO = 500 mA, VI =19 V, CI = 0.33 μF, CO = 0.1 μF, unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
TJ = +25°C
11.5
12.0
12.5
Output Voltage
5.0 mA ≤ IO ≤ 1.0 A, PO ≤ 15 W,
VI = 14.5 V to 27 V
11.4
12.0
12.6
Regline
Line Regulation(3)
TJ = +25°C
VI = 14.5 V to 30 V
10
240
VI = 16 V to 22 V
3
120
Regload
Load Regulation(3)
TJ = +25°C
IO = 5 mA to 1.5 A
11
240
IO = 250 mA to 750 mA
5
120
IQ
Quiescent Current
TJ = +25°C
5.1
8.0
IO = 5 mA to 1.0 A
0.1
0.5
VI = 14.5 V to 30 V
0.5
1.0
VO
ΔIQ
Quiescent Current Change
Unit
V
mV
mV
mA
mA
ΔVO/ΔT
Output Voltage Drift(4)
IO = 5 mA
-1
mV/°C
VN
Output Noise Voltage
f = 10 Hz to 100 kHz, TA = +25°C
76
μV
RR
Ripple Rejection
VDrop
Dropout Voltage
(4)
Resistance(4)
f = 120 Hz, VI = 15 V to 25 V
71
dB
IO = 1 A, TJ = +25°C
55
2
V
f = 1 kHz
18
mΩ
rO
Output
ISC
Short Circuit Current
VI = 35 V, TA = +25°C
230
mA
IPK
Peak Current(4)
TJ = +25°C
2.2
A
Notes:
3. Load and line regulation are specified at constant junction temperature. Changes in VO 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.
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
4
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Electrical Characteristics (MC7812E)
I
Figure 2. Quiescent Current
Figure 3. Peak Output Current
Figure 4. Output Voltage
Figure 5. Quiescent Current
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
5
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Typical Performance Characteristics
3
1
MC78XXE
Input
Output
2
CO
0.1uF
CI
0.33uF
Figure 6. DC Parameters
3
1
MC78XXE
Output
Input
270pF
RL
2
VO
2N6121
OR EQ.
0.33uF
OV
VO
30uS
100Ω
Figure 7. Load Regulation
5.1Ω
1
Input
3
MC78XXE
0.33uF
Output
2
RL
470uF
120Hz
+
Figure 8. Ripple Rejection
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
6
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Typical Applications
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Typical Applications (Continued)
3
1
MC78XXE
Input
Output
2
CO
0.1uF
CI
0.33uF
Figure 9. Fixed Output Regulator
1
3
MC78XXE
Input
Output
2
0.33uF
R1
0.1uF
VXX
CO
IQ
IO
IO =
VXX
R1
RL
+ IQ
Figure 10. Constant Current Regulator
Notes:
5. To specify an output voltage. substitute voltage value for "XX." A common ground is required between the input and
the Output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point
on the input ripple voltage.
6. CI is required if regulator is located an appreciable distance from power Supply filter.
7. CO improves stability and transient response.
1
Input
3
Output
MC78XXE
VXX
2
0.1uF
Cl
IQ
0.33uF
Co
IRI ≥ 5IQ
VO = VXX(1+R2/R1)+IQR2
R1
R2
Figure 11. Circuit for Increasing Output Voltage
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
7
1
Input
3
MC7805E
Output
2
Cl
0.33uF
_
6
2
0.1uF
LM741 3
+
4
Co
10kΩ
IRI ≥ 5IQ
VO = VXX(1+R2/R1)+IQR2
Figure 12. Adjustable Output Regulator (7 to 30V)
Q1 BD536
Input
IQ1
R1
3
1
MC78XXE
Output
IREG
3Ω
IO
2
0.1uF
0.33uF
VBEQ1
R1 =
IREG - IQ1/BQ1
IO = IREG+BQ1(IREG - VBEO1/R1)
Figure 13. High Current Voltage Regulator
Q1
RSC
Input
Q2
3
R1
Output
MC78XXE
3Ω
2
0.33uF
Q1 = TIP42
Q2 = TIP42
RSC=
0.1uF
VBEQ2
ISC
Figure 14. High Output Current with Short Circuit Protection
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
8
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Typical Applications (Continued)
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Typical Applications (Continued)
1
3
VO
MC78XXE
VI
2
0.33uF
0.1uF
4.7KΩ
COMMON
7
6
_
COMMON
2
LM741
+
4
3
4.7KΩ
-VIN
-VO
TIP42
Figure 15. Tracking Voltage Regulator
1
3
MC7812E
+20V
+12V
2
0.1uF
0.33uF
1uF +
+ 2.2uF
1N4001
1
-20V
1N4001
2
MC7912E
3
-12V
Figure 16. Split Power Supply (±12 V - 1 A)
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
9
Output
Input
+
0.1uF
2
1
MC78XXE
Figure 17. Negative Output Voltage Circuit
1mH
Output
Input
470Ω
4.7Ω
Z1
1
3
MC78XXE
+
0.33uF
2
10uF
+
2000uF
0.5Ω
Figure 18. Switching Regulator
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
10
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Typical Applications (Continued)
MC78XXE — 3-Terminal 1A Positive Voltage Regulator
Physical Dimensions
)
$
0,1
) 0,1
)
&
0,1
0$;
0,1
/$1'3$77(515(&200(1'$7,21
)
%
) )
0,1
) 6(('(7$,/$
%
)
*$*(3/$1(
) 127(681/(6627+(5:,6(63(&,),('
$127&203/,$1772-('(&729$5,$7,21$%
0$;
%$//',0(16,21$5(,10,//,0(7(5
&',0(16,216$5((;&/86,9(2)%855602/')/$6+
6($7,1*3/$1(
$1'7,(%$5(;7586,216
'/$'3$77(513(5,3&$$7$1'$5'
723;1
('5$:,1*),/(1$0(0.772'5(9
)'2(6127&203/<-('(&67$1'$5'9$/8(
*)$,5&+,/'6(0,&21'8&725
'(7$,/$
6&$/(
0,1
)
Figure 19. 3LEAD, TO-252, NOT COMPLIANT JEDEC TO-252 VAR. AB, SURFACE MOUNT (DPAK)
© 2003 Fairchild Semiconductor Corporation
MC78XXE Rev. 1.6
www.fairchildsemi.com
11
TRADEMARKS
The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not
intended to be an exhaustive list of all such trademarks.
F-PFS¥
FRFET®
SM
Global Power Resource
GreenBridge¥
Green FPS¥
Green FPS¥ e-Series¥
Gmax¥
GTO¥
IntelliMAX¥
ISOPLANAR¥
Making Small Speakers Sound Louder
and Better™
MegaBuck¥
MICROCOUPLER¥
MicroFET¥
MicroPak¥
MicroPak2¥
MillerDrive¥
MotionMax¥
MotionGrid®
MTi®
MTx®
MVN®
mWSaver®
OptoHiT¥
OPTOLOGIC®
AccuPower¥
AttitudeEngine™
Awinda®
AX-CAP®*
BitSiC¥
Build it Now¥
CorePLUS¥
CorePOWER¥
CROSSVOLT¥
CTL¥
Current Transfer Logic¥
DEUXPEED®
Dual Cool™
EcoSPARK®
EfficientMax¥
ESBC¥
®
®
Fairchild
Fairchild Semiconductor®
FACT Quiet Series¥
FACT®
FAST®
FastvCore¥
FETBench¥
FPS¥
OPTOPLANAR®
®
Power Supply WebDesigner¥
PowerTrench®
PowerXS™
Programmable Active Droop¥
QFET®
QS¥
Quiet Series¥
RapidConfigure¥
¥
Saving our world, 1mW/W/kW at a time™
SignalWise¥
SmartMax¥
SMART START¥
Solutions for Your Success¥
SPM®
STEALTH¥
SuperFET®
SuperSOT¥-3
SuperSOT¥-6
SuperSOT¥-8
SupreMOS®
SyncFET¥
Sync-Lock™
®*
®
TinyBoost
TinyBuck®
TinyCalc¥
TinyLogic®
TINYOPTO¥
TinyPower¥
TinyPWM¥
TinyWire¥
TranSiC¥
TriFault Detect¥
TRUECURRENT®*
μSerDes¥
UHC®
Ultra FRFET¥
UniFET¥
VCX¥
VisualMax¥
VoltagePlus¥
XS™
Xsens™
❺™
* Trademarks of System General Corporation, used under license by Fairchild Semiconductor.
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE
RELIABILITY, FUNCTION, OR DESIGN. TO OBTAIN THE LATEST, MOST UP-TO-DATE DATASHEET AND PRODUCT INFORMATION, VISIT OUR WEBSITE
AT HTTP://WWW.FAIRCHILDSEMI.COM. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY
PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY
THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE
EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems which, (a) are
2. A critical component in any component of a life support, device, or
intended for surgical implant into the body or (b) support or sustain
system whose failure to perform can be reasonably expected to
life, and (c) whose failure to perform when properly used in
cause the failure of the life support device or system, or to affect its
accordance with instructions for use provided in the labeling, can be
safety or effectiveness.
reasonably expected to result in a significant injury of the user.
ANTI-COUNTERFEITING POLICY
Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fairchild's Anti-Counterfeiting Policy is also stated on our external website, www.fairchildsemi.com,
under Sales Support.
Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing counterfeiting of their
parts. Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failed
applications, and increased cost of production and manufacturing delays. Fairchild is taking strong measures to protect ourselves and our customers from the
proliferation of counterfeit parts. Fairchild strongly encourages customers to purchase Fairchild parts either directly from Fairchild or from Authorized Fairchild
Distributors who are listed by country on our web page cited above. Products customers buy either from Fairchild directly or from Authorized Fairchild Distributors
are genuine parts, have full traceability, meet Fairchild's quality standards for handling and storage and provide access to Fairchild's full range of up-to-date technical
and product information. Fairchild and our Authorized Distributors will stand behind all warranties and will appropriately address any warranty issues that may arise.
Fairchild will not provide any warranty coverage or other assistance for parts bought from Unauthorized Sources. Fairchild is committed to combat this global
problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Advance Information
Formative / In Design
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
Definition
Datasheet contains the design specifications for product development. Specifications may change
in any manner without notice.
Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
Semiconductor reserves the right to make changes at any time without notice to improve design.
Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve the design.
Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Rev. I74
© Fairchild Semiconductor Corporation
www.fairchildsemi.com