Order this document by MC79M00/D
Three-Terminal Negative
Voltage Regulators
The MC79M00 series of fixed output negative voltage regulators are
intended as complements to the popular MC78M00 series devices.
Available in fixed output voltage options of –5.0, –8.0, –12 and –15 V,
these regulators employ current limiting, thermal shutdown, and safe–area
compensation – making them remarkably rugged under most operating
conditions. With adequate heatsinking they can deliver output currents in
excess of 0.5 A.
•
No External Components Required
MC79M00
Series
THREE–TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
•
•
•
•
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe–Area Compensation
Also Available in Surface Mount DPAK (DT) Package
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC79M05
MC79M08
–5.0 V
–8.0 V
MC79M12
MC79M15
–12 V
–15 V
Pin 1. Ground
2. Input
3. Output
Package
DPAK
TJ = – 40° to +125°C
4.0%
4 0%
TJ = 0° to +125°C
Plastic Power
DPAK
Plastic Power
1
3
1
2
3
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
1
2
3
ORDERING INFORMATION
Output
Voltage
Tolerance
Operating
Temperature Range
Device
MC79MXXBDT, BDT–1
MC79MXXBT
MC79MXXCDT, CDT–1
MC79MXXCT
XX indicates nominal voltage.
DT SUFFIX
PLASTIC PACKAGE
CASE 369A
(DPAK)
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369
(DPAK)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
Representative Schematic Diagram
Gnd
2.4 k
2.0 k
14.7 k
2.0 k
11.5 k
STANDARD APPLICATION
25
3.6 k
547
Input
4.0 k
R1
MC79MXX
Output
CO**
1.0
µF
1.2 k
1.0 k
12 k
2.0 k
Cin*
0.33
µF
4.9 k
R2
10 k
20 pF
10 pF 10 k
2.0 k
1.1 k
20 k 20 k
100
750
240
0.3
VI
VO
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 1.1 V more negative even during
the high point of the input ripple voltage.
XX, These two digits of the type number indicate
nominal voltage.
* Cin is required if regulator is located an
appreciable distance from power supply filter.
** CO improve stability and transient response.
This device contains 31 active transistors.
©
Motorola, Inc. 1996
Rev 4
MOTOROLA ANALOG IC DEVICE DATA
1
MOTOROLA [ MOTOROLA, INC ]
