Order this document by MC7900/D
The MC7900 series of fixed output negative voltage regulators are
intended as complements to the popular MC7800 series devices. These
negative regulators are available in the same seven–voltage options as the
MC7800 devices. In addition, one extra voltage option commonly employed
in MECL systems is also available in the negative MC7900 series.
Available in fixed output voltage options from –5.0 V to –24 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 1.0 A.
THREE–TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
T SUFFIX
PLASTIC PACKAGE
CASE 221A
• No External Components Required
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
Heatsink surface
connected to Pin 2.
• Output Transistor Safe–Area Compensation
• Available in 2% Voltage Tolerance (See Ordering Information)
1
2
3
Pin 1. Ground
2. Input
3. Output
Representative Schematic Diagram
Gnd
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
2.0 k
8.0 k
1.0 k
2
(D PAK)
2
1
R
R
3.6 k
1.2 k
4.0 k
1
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
1.6 k
2
V
10 k
O
STANDARD APPLICATION
20 pF
MC79XX
Input
Output
10 pF 10 k
240
C
*
in
C
1.0
**
µ
O
0.33 µF
20 k
20 k
2.0 k
F
0.3
1.1 k
750
V
I
This device contains 26 active transistors.
Acommongroundisrequiredbetweentheinput
and the output voltages. The input voltage must
remain typically 2.0 V above more negative even
during the high point of the input ripple voltage.
ORDERING INFORMATION
Output Voltage
Tolerance
Operating
Temperature Range
XX, These two digits of the type number
indicate nominal voltage.
Device
Package
** C is required if regulator is located an
appreciable distance from power supply filter.
** C improve stability and transient response.
O
MC79XXACD2T
MC79XXCD2T
MC79XXACT
MC79XXCT
2%
4%
2%
4%
in
Surface Mount
Insertion Mount
T = 0° to +125°C
J
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC79XXBD2T
MC79XXBT
Surface Mount
Insertion Mount
4%
T = –40° to +125°C
J
MC7905
MC7905.2
MC7906
MC7908
5.0 V
5.2 V
6.0 V
8.0 V
MC7912
MC7915
MC7918
MC7924
12 V
15 V
28 V
24 V
XX indicates nominal voltage.
Motorola, Inc. 1996
Rev 6
1
MOTOROLA ANALOG IC DEVICE DATA