MC7900 Series
1.0 A Negative Voltage
Regulators
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.
•
No External Components Required
•
Internal Thermal Overload Protection
•
Internal Short Circuit Current Limiting
•
Output Transistor Safe−Area Compensation
•
Available in 2% Voltage Tolerance (See Ordering Information)
•
Pb−Free Package May be Available. The G−Suffix Denotes a
Pb−Free Lead Finish
Gnd
14.7 k
2.4 k
2.0 k
2.0 k
8.0 k
1.0 k
12 k
1.0 k
4.0 k
1.6 k
R
2
4.0 k
R
1
http://onsemi.com
TO−220
T SUFFIX
CASE 221A
Heatsink surface
connected to Pin 2.
1
2
3
Pin 1. Ground
2. Input
3. Output
D
2
PAK
D2T SUFFIX
CASE 936
1
2
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
3.6 k
1.2 k
25
STANDARD APPLICATION
Input
10 k
20 pF
10 pF
10 k
240
0.3
750
V
O
MC79XX
Output
C
O
**
1.0
mF
C
in
*
0.33
mF
2.0 k
1.1 k
20 k
20 k
A common ground is required between the input
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.
XX, These two digits of the type number
indicate nominal voltage.
**
C
in
is required if regulator is located an
appreciable distance from power supply filter.
** C
O
improve stability and transient response.
This device contains 26 active transistors.
V
I
Figure 1. Representative Schematic Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 12 of this data sheet.
©
Semiconductor Components Industries, LLC, 2004
1
March, 2004 − Rev. 12
Publication Order Number:
MC7900/D
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