
THREE–TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369
(DPAK)
DT SUFFIX
PLASTIC PACKAGE
CASE 369A
(DPAK)
Pin 1. Ground
2. Input
3. Output
STANDARD APPLICATION
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.
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.
MC79MXX
Input
Cin*
0.33
μ
F
Output
CO**
1.0
μ
F
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
3
1
2
3
12
3
1
XX,
*
**
Order this document by MC79M00/D
1
MOTOROLA ANALOG IC DEVICE DATA
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
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
ORDERING INFORMATION
Device
Output
Voltage
Tolerance
Operating
Temperature Range
Package
MC79MXXBDT, BDT–1
4 0%
4.0%
TJ= –40
°
°
TJ = –40
to +125
C
DPAK
MC79MXXBT
Plastic Power
MC79MXXCDT, CDT–1
TJ= 0
TJ = 0
°
to +125
°
C
DPAK
MC79MXXCT
Plastic Power
XX indicates nominal voltage.
Representative Schematic Diagram
Gnd
VO
VI
2
2
3
1
1.1 k
2.0 k
1
1
4
2
1
1
5
2
4.0 k
0.3
10 k
10 k
20 k
20 k
20 pF
10 pF
240
750
100
2
This device contains 31 active transistors.
R1
R2
Motorola, Inc. 1996
Rev 4