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MC79M00 Series
500 mA 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 V, −8.0 V, −12 V
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
Pb−Free Packages are Available
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
Device
Nominal Output Voltage
MC79M05
MC79M08
MC79M12
MC79M15
−5.0 V
−8.0 V
−12 V
−15 V
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GND
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THREE−TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
STANDARD APPLICATION
Input
Cin*
0.33 mF
MC79MXX
Output
CO**
1.0 mF
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.
MARKING
DIAGRAMS
4.0 k R1
R2
10 k VO
20 pF
10 pF 10 k
2.0 k
1.1 k
20 k 20 k
240
100
750
This device contains 31 active transistors.
Figure 1. Representative Schematic Diagram
0.3
VI
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 11
1
1
2
3
Pin 1. Ground
2. Input
3. Output
TO−220−3
T SUFFIX
CASE 221AB
MC
79MxxyT
AWLYWWG
4
12
3
DPAK−3
DT SUFFIX
CASE 369C
9MxxBG
ALYWW
79MxxG
ALYWW
xx
y
A
WL, L
Y
WW
G
= 05, 08, 12, or 15
= B or C
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
Publication Order Number:
MC79M00/D

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MC79M00 Series
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input Voltage
Power Dissipation
VI −35 Vdc
Case 221A (TO−220−3)
TA = 25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 369C (DPAK−3)
PD Internally Limited W
qJA 65 °C/W
qJC 5.0 °C/W
TA = 25°C
PD Internally Limited W
Thermal Resistance, Junction−to−Ambient
qJA 92 °C/W
Thermal Resistance, Junction−to−Case
qJC 6.0 °C/W
Storage Junction Temperature
Tstg
−65 to +150
°C
Operating Junction Temperature Range
TJ
−40 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
*This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL_STD_883, Method 3015
Machine Model Method 200 V
MC79M05B, C
ELECTRICAL CHARACTERISTICS (VI = −10 V, IO = 350 mA, Tlow to Thigh (Note 2), unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C)
Line Regulation, TJ = 25°C (Note 1)
−7.0 Vdc VI −25 Vdc
−8.0 Vdc VI −18 Vdc
VO
Regline
−4.8 −5.0 −5.2
− 7.0 50
− 2.0 30
Vdc
mV
Load Regulation, TJ = 25°C (Note 1)
5.0 mA IO 500 mA
Regload
mV
30 100
Output Voltage
−7.0 Vdc VI −25 Vdc, 5.0 mA IO 350 mA
VO Vdc
−4.75 − −5.25
Input Bias Current (TJ = 25°C)
Input Bias Current Change
−8.0 Vdc VI −25 Vdc, IO = 350 mA
5.0 mA IO 350 mA, VI = −10 V
IIB − 4.3 8.0 mA
DIIB mA
− − 0.4
− − 0.4
Output Noise Voltage, TA = 25°C, 10 Hz f 100 kHz
Ripple Rejection (f = 120 Hz)
Vn − 40 − mV
RR 54 66 − dB
Dropout Voltage
IO = 500 mA, TJ = 25°C
VI−VO
Vdc
− 1.1 −
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C TJ 125°C
DVO/DT
mV/°C
− 0.2 −
1. Load and line regulation are specified at constant temperature. Change in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
2. B = Tlow to Thigh, −40°C < TJ < 125°C C = Tlow to Thigh, 0°C < TJ < 125°C.
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MC79M00 Series
MC79M08B, C
ELECTRICAL CHARACTERISTICS (VI = −10 V, IO = 350 mA, Tlow to Thigh (Note 4), unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C)
Line Regulation, TJ = 25°C (Note 3)
−7.0 Vdc VI −25 Vdc
−8.0 Vdc VI −18 Vdc
VO
Regline
−7.7 −8.0 −8.3
− 5.0 80
− 3.0 50
Vdc
mV
Load Regulation, TJ = 25°C (Note 3)
5.0 mA IO 500 mA
Regload
mV
30 100
Output Voltage
−7.0 Vdc VI −25 Vdc, 5.0 mA IO 350 mA
VO Vdc
−7.6 −8.0 −8.4
Input Bias Current (TJ = 25°C)
Input Bias Current Change
−8.0 Vdc VI −25 Vdc, IO = 350 mA
5.0 mA IO 350 mA, VI = −10 V
IIB − − 8.0 mA
DIIB mA
− − 0.4
− − 0.4
Output Noise Voltage, TA = 25°C, 10 Hz f 100 kHz
Ripple Rejection (f = 120 Hz)
Vn − 60 − mV
RR 54 63 − dB
Dropout Voltage
IO = 500 mA, TJ = 25°C
VI−VO
Vdc
− 1.1 −
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C TJ 125°C
DVO/DT
mV/°C
− 0.4 −
3. Load and line regulation are specified at constant temperature. Change in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
4. B = Tlow to Thigh, −40°C < TJ < 125°C
C = Tlow to Thigh, 0°C < TJ < 125°C
MC79M12B, C
ELECTRICAL CHARACTERISTICS (VI = −19 V, IO = 350 mA, Tlow to Thigh (Note 6), unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C)
Line Regulation, TJ = 25°C (Note 5)
−14.5 Vdc VI −30 Vdc
−15 Vdc VI −25 Vdc
VO −11.5 −12 −12.5 Vdc
Regline
mV
− 5.0 80
− 3.0 50
Load Regulation, TJ = 25°C (Note 5)
5.0 mA IO 500 mA
Regload
mV
30 240
Output Voltage
−14.5 Vdc VI −30 Vdc, 5.0 mA IO 350 mA
VO Vdc
−11.4 − −12.6
Input Bias Current (TJ = 25°C)
Input Bias Current Change
−14.5 Vdc VI −30 Vdc, IO = 350 mA
5.0 mA IO 350 mA, VI = −19 V
IIB − 4.4 8.0 mA
DIIB mA
− − 0.4
− − 0.4
Output Noise Voltage, TA = 25°C, 10 Hz f 100 kHz
Ripple Rejection (f = 120 Hz)
Vn − 75 − mV
RR 54 60 − dB
Dropout Voltage
IO = 500 mA, TJ = 25°C
VI−VO
Vdc
− 1.1 −
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C TJ 125°C
DVO/DT
mV/°C
− −0.8 −
5. Load and line regulation are specified at constant temperature. Change in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
6. B = Tlow to Thigh, −40°C < TJ < 125°C
C = Tlow to Thigh, 0°C < TJ < 125°C
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