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Order this document by MC79L00/D
Three-Terminal Low Current
Negative Voltage Regulators
The MC79L00, A Series negative voltage regulators are inexpensive,
easy–to–use devices suitable for numerous applications requiring up to100
mA. Like the higher powered MC7900 Series negative regulators, this series
features thermal shutdown and current limiting, making them remarkably
rugged. In most applications, no external components are required for
operation.
The MC79L00 devices are useful for on–card regulation or any other
application where a regulated negative voltage at a modest current level is
needed. These regulators offer substantial advantage over the common
resistor/zener diode approach.
No External Components Required
Internal Short Circuit Current Limiting
Internal Thermal Overload Protection
Low Cost
Complementary Positive Regulators Offered (MC78L00 Series)
Available in Either ±5% (AC) or ±10% (C) Selections
MC79L00, A
Series
THREE–TERMINAL LOW
CURRENT NEGATIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Ground
2. Input
3. Output
1
2
3
Representative Schematic Diagram
R6
R
R8
Q10
5 Q5
R18
R1
Q4
R9
Gnd
R17
R7
Q1
R2
Z1
R3
R4
Q8 Q14
Q9
R16
Output
Q12
C Q2
Q13
Q6 Q7 Q11
R10 R11
R14 R15
Input
* Automotive temperature range selections are available with special test conditions
* and additional tests in 5, 12 and 15 V devices. Contact your local Motorola sales
* office for information.
8
1
Pin 1. Vout
2. Vin
3. Vin
4. NC
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)*
5. GND
6. Vin
7. Vin
8. NC
* SOP–8 is an internally modified SO–8 package.
Pins 2, 3, 6, and 7 are electrically common to the
die attach flag. This internal lead frame modifica-
tion decreases package thermal resistance and
increases power dissipation capability when
appropriately mounted on a printed circuit board.
SOP–8 conforms to all external dimensions of the
standard SO–8 package.
Device No.
±10%
MC79L05C
MC79L12C
MC79L15C
MC79L18C
MC79L24C
Device No.
5%
MC79L05AC
MC79L12AC
MC79L15AC
MC79L18AC
MC79L24AC
Nominal
Voltage
–5.0
–12
–15
–18
–24
ORDERING INFORMATION
Device
MC79LXXACD*
Operating
Temperature Range
Package
SOP–8
MC79LXXACP
MC79LXXCP
MC79LXXABD*
MC79LXXABP*
TJ = 0° to +125°C
TJ = –40° to +125°C
Plastic Power
Plastic Power
SOP–8
Plastic Power
XX indicates nominal voltage
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 2
1

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MC79L00, A Series
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input Voltage (–5 V)
Input Voltage (–12, –15, –18 V)
Input Voltage (–24 V)
VI –30 Vdc
–35
–40
Storage Temperature Range
Junction Temperature
Tstg –65 to +150
TJ +150
°C
°C
ELECTRICAL CHARACTERISTICS (VI = –10 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, –40°C < TJ +125°C (for MC79LXXAB),
0°C < TJ < +125°C (for MC79LXXAC)).
MC79L05C, AB
MC79L05AC, AB
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–7.0 Vdc VI –20 Vdc
–8.0 Vdc VI –20 Vdc
VO –4.6 –5.0 –5.4 –4.8 –5.0 –5.2 Vdc
Regline
mV
– – 200 – – 150
– – 150 – – 100
Load Regulation
TJ = +25°C, 1.0 mA IO 100 mA
1.0 mA IO 40 mA
Regload
– 60 –
– 30 –
mV
– 60
– 30
Output Voltage
–7.0 Vdc VI –20 Vdc, 1.0 mA IO 40 mA
VI = –10 Vdc, 1.0 mA IO 70 mA
VO Vdc
–4.5 – –5.5 –4.75 – –5.25
–4.5 – –5.5 –4.75 – –5.25
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB mA
– – 6.0 – – 6.0
– – 5.5 – – 5.5
Input Bias Current Change
–8.0 Vdc VI –20 Vdc
1.0 mA IO 40 mA
IIB mA
– – 1.5 – – 1.5
– – 0.2 – – 0.1
Output Noise Voltage
(TA = +25°C, 10 Hz f 100 kHz)
Vn
– 40 –
– 40 – µV
Ripple Rejection
(–8.0 VI –18 Vdc, f = 120 Hz, TJ = +25°C)
RR 40 49 – 41 49 – dB
Dropout Voltage (IO = 40 mA, TJ = +25°C)
|VI–VO|
1.7
– 1.7 – Vdc
ELECTRICAL CHARACTERISTICS (VI = –19 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, –40°C < TJ +125°C (for MC79LXXAC),
0°C < TJ < +125°C (for MC79LXXAB)).
MC79L12C, AB
MC79L12AC, AB
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
VO –11.1 –12 –12.9 –11.5 –12 –12.5 Vdc
Input Regulation
(TJ = +25°C)
–14.5 Vdc VI –27 Vdc
–16 Vdc VI –27 Vdc
Regline
– 250 –
– 200 –
mV
– 250
– 200
Load Regulation
TJ = +25°C, 1.0 mA IO 100 mA
1.0 mA IO 40 mA
Regload
– 100 –
– 50 –
mV
– 100
– 50
Output Voltage
–14.5 Vdc VI –27 Vdc, 1.0 mA IO 40 mA
VI = –19 Vdc, 1.0 mA IO 70 mA
VO Vdc
–10.8 – –13.2 –11.4 – –12.6
–10.8 – –13.2 –11.4 – –12.6
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB mA
– – 6.5 – – 6.5
– – 6.0 – – 6.0
Input Bias Current Change
–16 Vdc VI –27 Vdc
1.0 mA IO 40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz f 100 kHz)
IIB mA
– – 1.5 – – 1.5
– – 0.2 – – 0.2
Vn
– 80 –
– 80 – µV
Ripple Rejection
(–15 VI –25 Vdc, f = 120 Hz, TJ = +25°C)
RR 36 42 – 37 42 – dB
Dropout Voltage (IO = 40 mA, TJ = +25°C)
|VI–VO|
1.7
– 1.7 – Vdc
2 MOTOROLA ANALOG IC DEVICE DATA

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MC79L00, A Series
ELECTRICAL CHARACTERISTICS (VI = –23 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, –40°C < TJ +125°C (for MC79LXXAB),
0°C < TJ < +125°C (for MC79LXXAC)).
MC79L15C
MC79L15AC, AB
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–17.5 Vdc VI –30 Vdc
–20 Vdc VI –30 Vdc
Load Regulation
TJ = +25°C, 1.0 mA IO 100 mA
1.0 mA IO 40 mA
Output Voltage
–17.5 Vdc VI –Vdc, 1.0 mA IO 40 mA
VI = –23 Vdc, 1.0 mA IO 70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–20 Vdc VI –30 Vdc
1.0 mA IO 40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz f 100 kHz)
Ripple Rejection
(–18.5 VI –28.5 Vdc, f = 120 Hz)
Dropout Voltage
IO = 40 mA, TJ = +25°C
VO –13.8 –15 –16.2 –14.4 –15 –15.6 Vdc
Regline
mV
– – 300 – – 300
– – 250 – – 250
Regload
– 150 –
– 75 –
mV
– 150
– 75
VO Vdc
–13.5 – –16.5 –14.25 – –15.75
–13.5 – –16.5 –14.25 – –15.75
IIB mA
– – 6.5 – – 6.5
– – 6.0 – – 6.0
IIB mA
– – 1.5 – – 1.5
– – 0.2 – – 0.1
VN
– 90 –
– 90 – µV
RR 33 39 – 34 39 – dB
|VI–VO|
1.7
– 1.7 – Vdc
ELECTRICAL CHARACTERISTICS (VI = –27 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, 0°C < TJ > +125°C, unless otherwise noted).
MC79L18C
MC79L18AC
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–20.7 Vdc VI –33 Vdc
–21.4 Vdc VI –33 Vdc
–22 Vdc VI –33 Vdc
–21 Vdc VI –33 Vdc
Load Regulation
TJ = +25°C, 1.0 mA IO 100 mA
1.0 mA IO 40 mA
Output Voltage
–20.7 Vdc VI –33 Vdc, 1.0 mA IO 40 mA
–21.4 Vdc VI –33 Vdc, 1.0 mA IO 40 mA
VI = –27 Vdc, 1.0 mA IO 70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–21 Vdc VI –33 Vdc
–27 Vdc VI –33 Vdc
1.0 mA IO 40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz f 100 kHz)
Ripple Rejection
(–23 VI –33 Vdc, f = 120 Hz, TJ = +25°C)
Dropout Voltage
IO = 40 mA, TJ = +25°C
VO –16.6 –18 –19.4 –17.3 –18 –18.7 Vdc
Regline
mV
Regload
VO
–16.2
–16.2
IIB
IIB
Vn –
–––
– 325 –
– 275 –
–––
– 325
––
––
– 275
– 170 –
– 85 –
mV
– 170
– 85
Vdc
– – –17.1 – –18.9
– –19.8 – – –
– –19.8 –17.1 – –18.9
– 6.5 –
– 6.0 –
mA
– 6.5
– 6.0
–––
– 1.5 –
– 0.2 –
mA
– 1.5
––
– 0.1
150 –
– 150 –
µV
RR 32 46 – 33 48 – dB
|VI–VO|
1.7
– 1.7 – Vdc
MOTOROLA ANALOG IC DEVICE DATA
3

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MC79L00, A Series
ELECTRICAL CHARACTERISTICS (VI = –33 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, 0°C < TJ < +125°C, unless otherwise noted).
MC79L24C
MC79L24AC
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max Unit
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–27 Vdc VI –38 Vdc
–27.5 Vdc VI –38 Vdc
–28 Vdc VI –38 Vdc
Load Regulation
TJ = +25°C, 1.0 mA IO 100 mA
1.0 mA IO 40 mA
Output Voltage
–27 Vdc VI –38 V, 1.0 mA IO 40 mA
–28 Vdc VI –38 Vdc, 1.0 mA IO 40 mA
VI = –33 Vdc, 1.0 mA IO 70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–28 Vdc VI –38 Vdc
1.0 mA IO 40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz f 100 kHz)
VO –22.1 –24 –25.9 –23 –24 –25 Vdc
Regline
mV
– – – – – 350
– – 350 – – –
– – 300 – – 300
Regload
– 200 –
– 100 –
mV
– 200
– 100
VO Vdc
– – – –22.8 – –25.2
–21.4 – –26.4 – – –
–21.4 – –26.4 –22.8 – –25.2
IIB mA
– – 6.5 – – 6.5
– – 6.0 – – 6.0
IIB mA
– – 1.5 – – 1.5
– – 0.2 – – 0.1
Vn
– 200 –
– 200 –
µV
Ripple Rejection
(–29 VI –35 Vdc, f = 120 Hz, TJ = +25°C)
RR 30 43 – 31 47 – dB
Dropout Voltage
IO = 40 mA, TJ = +25°C
|VI–VO|
1.7
– 1.7 – Vdc
APPLICATIONS INFORMATION
Design Considerations
The MC79L00, A Series of fixed voltage regulators are
designed with Thermal Overload Protections that shuts down
the circuit when subjected to an excessive power overload
condition, Internal Short Circuit Protection that limits the
maximum current the circuit will pass.
In many low current applications, compensation
capacitors are not required. However, it is recommended that
the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long wire
length, or if the output load capacitance is large. An input
bypass capacitor should be selected to provide good
high–frequency characteristics to insure stable operation
under all load conditions. A 0.33 µF or larger tantalum, mylar,
or other capacitor having low internal impedance at high
frequencies should be chosen. The bypass capacitor should
be mounted with the shortest possible leads directly across
the regulator’s input terminals. Normally good construction
techniques should be used to minimize ground loops and
lead resistance drops since the regulator has no external
sense lead. Bypassing the output is also recommended.
Figure 1. Positive and Negative Regulator
+Vin
0.33µF
MC78LXX
+VO
0.1µF
Figure 2. Standard Application
Input
CI*
0.33µF
MC79LXX
Output
CO**
0.1µF
–Vin
0.33µF
MC79LXX
0.1µF
–VO
A common ground is required between the input and the output
voltages. The input voltage must remain typically 2.0 V above
the output voltage even during the low point on the ripple voltage.
* CI is required if regulator is located an appreciable
* distance from the power supply filter
** CO improves stability and transient response.
4 MOTOROLA ANALOG IC DEVICE DATA

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MC79L00, A Series
TYPICAL CHARACTERISTICS
(TA = +25°C, unless otherwise noted.)
Figure 3. Dropout Characteristics
8.0
MC79L05C
6.0
VO = –5.0 V
TJ = 25°C
IO = 1.0 mA
IO = 100 mA
4.0
2.0
IO = 40 mA
0
0 –2.0 –4.0 –6.0 –0.8 –10
Vin, INPUT VOLTAGE (V)
Figure 4. Dropout Voltage versus
Junction Temperature
–2.5
–2.0 IO = 70 mA
–1.5
–1.0
Dropout of Regulation is
defined when
–0.5 VO = 2% of VO
IO = 1.0 mA
IO = 40 mA
0
0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Input Bias Current versus
Ambient Temperature
4.2
4.0
3.8
3.6
3.4
MC79L05C
3.2 Vin = –10 V
VO = –5.0 V
3.0 IO = 40 mA
0
0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 6. Input Bias Current versus
Input Voltage
5.0
4.0
3.0
MC79L05C
VO = –5.0 V
2.0 IO = 40 mA
1.0
0
0 –5.0 –10 –15 –20 –25 –30 –35 –40
Vin, INPUT VOLTAGE (V)
Figure 7. Maximum Average Power Dissipation
versus Ambient Temperature (TO–92)
10,000
1,000
No Heatsink
100
RΘJA = 200°C/W
PD(max) to 25°C = 625 mW
10
25 50 75
100
125
TA, AMBIENT TEMPERATURE (°C)
150
Figure 8. SOP–8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
170 3.2
150 2.8
PD(max) for TA = +50°C
130 2.4
110 Graph represents symmetrical layout 2.0
ÎÎÎÎÎÎÎÎÎÎÎÎÎ90
L
2.0 oz.
Copper
1.6
70 1.2
ÎÎÎ ÎÎÎL 3.0mm
50 0.8
RθJA
30 0.4
0 10 20 30 40 50
L, LENGTH OF COPPER (mm)
MOTOROLA ANALOG IC DEVICE DATA
5