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Fairchild Semiconductor Electronic Components Datasheet

MC7812A Datasheet

3-Terminal 1A Positive Voltage Regulator

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www.fairchildsemi.com
MC78XX/LM78XX/MC78XXA
3-Terminal 1A Positive Voltage Regulator
Features
• Output Current up to 1A
• Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24V
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Protection
Description
The MC78XX/LM78XX/MC78XXA series of three
terminal positive regulators are available in the
TO-220/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 1A output current.
Although designed primarily as fixed voltage regulators,
these devices can be used with external components to
obtain adjustable voltages and currents.
TO-220
1
D-PAK
1
1. Input 2. GND 3. Output
Internal Block Digram
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.1


Fairchild Semiconductor Electronic Components Datasheet

MC7812A Datasheet

3-Terminal 1A Positive Voltage Regulator

No Preview Available !

MC78XX/LM78XX/MC78XXA
Absolute Maximum Ratings
Parameter
Input Voltage (for VO = 5V to 18V)
(for VO = 24V)
Thermal Resistance Junction-Cases (TO-220)
Thermal Resistance Junction-Air (TO-220)
Operating Temperature Range
Storage Temperature Range
Symbol
VI
VI
RθJC
RθJA
TOPR
TSTG
Value
35
40
5
65
0 ~ +125
-65 ~ +150
Unit
V
V
oC/W
oC/W
oC
oC
Electrical Characteristics (MC7805/LM7805)
(Refer to test circuit ,0°C < TJ < 125°C, IO = 500mA, VI = 10V, CI= 0.33µF, CO= 0.1µF, unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Output Resistance
Short Circuit Current
Peak Current
Symbol
Conditions
VO
Regline
Regload
IQ
IQ
VO/T
VN
RR
VDrop
rO
ISC
IPK
TJ =+25 oC
5.0mA Io 1.0A, PO 15W
VI = 7V to 20V
TJ=+25 oC
VO = 7V to 25V
VI = 8V to 12V
TJ=+25 oC
IO = 5.0mA to1.5A
IO =250mA to
750mA
TJ =+25 oC
IO = 5mA to 1.0A
VI= 7V to 25V
IO= 5mA
f = 10Hz to 100KHz, TA=+25 oC
f = 120Hz
VO = 8V to 18V
IO = 1A, TJ =+25 oC
f = 1KHz
VI = 35V, TA =+25 oC
TJ =+25 oC
MC7805/LM7805
Min. Typ. Max.
4.8 5.0 5.2
Unit
4.75 5.0 5.25
V
- 4.0 100
mV
- 1.6 50
- 9 100
mV
- 4 50
- 5.0 8.0 mA
- 0.03 0.5
mA
- 0.3 1.3
- -0.8 - mV/ oC
- 42 - µV/Vo
62 73
-
dB
- 2-
- 15 -
- 230 -
- 2.2 -
V
m
mA
A
Note:
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


Part Number MC7812A
Description 3-Terminal 1A Positive Voltage Regulator
Maker Fairchild
Total Page 28 Pages
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