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www.fairchildsemi.com  
MC79LXXA/LM79LXXA  
3-Terminal 0.1A Negative Voltage Regulator  
Features  
Description  
• Output Current up to 100mA  
• No External Components  
These regulators employ internal current limiting and  
thermal shutdown, making them essentially indestructible.  
• Internal Thermal Over Load Protection  
• Internal Short Circuit Current Limiting  
• Output Voltage Offered in ±5% Tolerance  
• Output Voltage of -5V, -8V, -12V, -15V, -18V, -24V  
TO-92  
SOT-89  
1
1
1.GND 2.Input 3.Output  
8-SOP  
1
1. Output 2.3.6.7. Input 5. GND 4.8. NC  
Internal Block Diagram  
GND  
R26  
Q12  
R15  
Q10  
Q11  
D3  
D2  
R22  
Q5  
R23+R21  
Q6  
Q7  
R
Output  
R18  
Q15  
Q13  
R25  
Q4  
R1  
D1  
R6  
Q17  
Q2  
Q3  
C1  
Q1  
Q9  
R7  
Q8  
Q14  
Q16  
R28  
R17  
R2 R3  
R16  
R29  
R27  
R24  
R5  
R4  
Input  
Rev. 1.0.2  
©2002 Fairchild Semiconductor Corporation  
MC79LXXA/LM79LXXA  
Absolute Maximum Ratings  
Parameter  
Symbol  
Value  
Unit  
Input Voltage (for V = -5V to -8V)  
-30  
-35  
-40  
o
(for V = -12V to -18V)  
V
I
V
O
(for V = -24V)  
O
Operating Temperature Range  
Storage Temperature Range  
T
0 ~ +125  
°C  
°C  
OPR  
T
-65 ~ +150  
STG  
Electrical Characteristics(MC79L05A/LM79L05A)  
(V = -10V, I = 40mA, C = 0.33µF, C = 0.1µF, 0°C ≤T ≤ +125°C, unless otherwise specified)  
I
O
I
O
J
Parameter  
Symbol  
Conditions  
Min. Typ. Max. Unit  
Output Voltage  
V
T = +25°C  
J
-4.8 -5.0 -5.2  
V
O
-7.0V ≥ V ≥ -20V  
-
-
15  
-
150  
100  
mV  
I
Line Regulation (Note1)  
∆V  
∆V  
T =+25°C  
J
O
O
-8V ≥ V ≥ -20V  
mV  
I
1.0mA ≤ I ≤ 100mA  
-
20  
10  
-
60  
30  
mV  
mV  
V
O
Load Regulation (Note1)  
Output Voltage  
T =+25°C  
J
1.0mA ≤ I ≤ 40mA  
-
O
-7.0V ≥ V ≥ -20V, 1.0mA ≤ I ≤ 40mA  
-4.75  
-5.25  
-5.25  
5.5  
6.0  
1.5  
0.1  
-
I
O
V
O
V = -10V, 1.0mA ≤ I ≤ 70mA  
I
-4.75  
-
V
O
T =+25°C  
-
-
-
-
-
2.0  
-
J
Quiescent Current  
I
mA  
Q
T = +125°C  
J
With Line  
With Load  
∆I  
∆I  
-8V ≥ V ≥ -20V  
-
mA  
mA  
µV  
Q
I
Quiescent Current  
Change  
1.0mA ≤ I ≤ 40mA  
-
Q
N
O
Output Noise Voltage  
Ripple Rejection  
Dropout Voltage  
V
T = +25°C,10Hz ≤ f ≤ 100kHz  
A
30  
f = 120Hz, -8V ≥ V ≥ -18V  
T = +25°C  
J
I
RR  
41  
-
60  
-
-
dB  
V
V
T = +25°C  
J
1.7  
D
Note:  
1. Load and line regulation are specified at constant junction temperature. Change in V due to heating effects must be taken  
O
into account separately. Pulse testing with low duty is used.  
2
MC79LXXA/LM79LXXA  
Electrical Characteristics (MC79L08A) (Continued)  
(V = -14V, I = 40mA, C = 0.33µF, C = 0.1µF, 0°C ≤T ≤ +125°C, unless otherwise specified)  
I
O
I
O
J
Parameter  
Symbol  
Conditions  
Min. Typ. Max. Unit  
Output Voltage  
V
T = +25°C  
J
-7.7 -8.0 -8.3  
V
O
-10.3V ≥ V ≥ -23V  
-
-
-
-
175 mV  
125 mV  
I
Line Regulation(Note1)  
∆V  
∆V  
T = +25°C  
J
O
-12V ≥ V ≥ -23V  
I
1.0mA ≤ I ≤ 100mA  
-
-
-
80  
40  
mV  
mV  
o
Load Regulation (Note1)  
Output Voltage  
T = +25°C  
J
O
1.0mA ≤ I ≤ 40mA  
-
o
-10.3V ≥ V ≥ -23V, 1.0mA ≤ I ≤ 40mA  
-7.6  
-
-8.4  
-8.4  
6.0  
5.5  
1.5  
0.1  
-
I
o
V
V
O
V = -14V, 1.0mA ≤ I ≤ 70mA  
I
-7.6  
-
o
T = +25°C  
-
-
-
-
-
-
j
Quiescent Current  
I
mA  
q
T = +125°C  
j
-
With Line  
With Load  
-11.7V ≥ V ≥ -23V  
-
mA  
mA  
µV  
I
Quiescent Current  
Change  
∆I  
Q
1.0mA ≤ I ≤ 40mA  
-
o
Output Noise Voltage  
Ripple Rejection  
Dropout Voltage  
V
T = +25°C,10Hz ≤ f ≤ 100kHz  
50  
N
j
f = 120Hz, -11V ≥ V ≥ -21V  
I
RR  
39  
-
55  
-
-
dB  
V
T = +25°C  
j
V
T = +25°C  
j
1.7  
D
Note:  
1. Load and line regulation are specified at constant junction temperature. Change in V due to heating effects must be taken  
O
into account separately. Pulse testing with low duty is used.  
3
MC79LXXA/LM79LXXA  
Electrical Characteristics(MC79L12A) (Continued)  
(V = -19V, I = 40mA, C = 0.33µF, C = 0.1µF, 0°C ≤T ≤ +125°C, unless otherwise specified)  
I
O
I
O
J
Parameter  
Symbol  
Conditions  
Min. Typ. Max. Unit  
Output Voltage  
V
T = +25°C  
J
-11.5 -12.0 -12.5  
V
O
-14.5V ≥ V ≥ -27V  
-
-
-
-
250  
200  
mV  
I
Line Regulation (Note1)  
∆V  
∆V  
T = +25°C  
J
O
O
-16V ≥ V ≥ -27V  
mV  
I
1.0mA ≤ I ≤ 100mA  
-
-
-
-
100  
50  
mV  
mV  
V
O
Load Regulation (Note1)  
Output Voltage  
T = +25°C  
J
1.0mA ≤ I ≤ 40mA  
O
-14.5V > V > -27V, 1.0mA ≤ I ≤ 40mA -11.4  
-
-12.6  
-12.6  
6.0  
6.5  
1.5  
0.1  
-
I
O
V
O
V = -19V, 1.0mA ≤ I ≤ 70mA  
I
-11.4  
-
V
O
T = +25°C  
-
-
-
-
-
-
J
Quiescent Current  
I
mA  
Q
T = +125°C  
J
-
With Line  
With Load  
∆I  
∆I  
-16V ≥ V ≥ -27V  
-
mA  
mA  
µV  
Q
I
Quiescent Current  
Change  
1.0mA ≤ I ≤ 40mA  
-
Q
N
O
Output Noise Voltage  
Ripple Rejection  
Dropout Voltage  
V
T = +25°C,10Hz ≤ f ≤ 100kHz  
A
80  
f = 120Hz, -15V≥ V ≥ -25V  
T = +25°C  
J
I
RR  
37  
-
42  
-
-
dB  
V
V
T = +25°C  
J
1.7  
D
Note:  
1. Load and line regulation are specified at constant junction temperature. Change in V due to heating effects must be taken  
O
into account separately. Pulse testing with low duty is used.  
4
MC79LXXA/LM79LXXA  
Electrical Characteristics(MC79L15A) (Continued)  
(V = -23V, I = 40mA, C = 0.33µF, C = 0.1µF, 0°C ≤T ≤ +125°C, unless otherwise specified)  
I
O
I
O
J
Parameter  
Symbol  
Conditions  
Min. Typ. Max. Unit  
Output Voltage  
V
O
T = +25°C  
J
-14.4 -15.0 -15.6  
V
-17.5V ≥ V ≥ -30V  
-
-
-
-
300  
250  
mV  
I
Line Regulation (Note1)  
∆V  
∆V  
T = +25°C  
J
O
O
-20V ≥ V ≥ -30V  
mV  
I
1.0mA ≤ I ≤ 100mA  
-
-
-
-
150  
75  
mV  
mV  
V
O
Load Regulation (Note1)  
Output Voltage  
T = +25°C  
J
1.0mA ≤ I ≤ 40mA  
O
-17.5V ≥ V ≥ -30V, 1.0mA ≤ I ≤ 40mA -14.25  
-
-15.75  
-15.75  
6.0  
I
O
V
O
V = -23V, 1.0mA ≤ I ≤ 70mA  
I
-14.25  
-
V
O
T = +25°C  
-
-
-
-
-
-
J
Quiescent Current  
I
mA  
Q
T = +125°C  
J
-
6.5  
With Line  
With Load  
∆I  
∆I  
-20V ≥ V ≥ -30V  
-
1.5  
mA  
mA  
µV  
Q
I
Quiescent Current  
Change  
1.0mA ≤ I ≤ 40mA  
-
0.1  
Q
N
O
Output Noise Voltage  
Ripple Rejection  
Dropout Voltage  
V
T = +25°C,10Hz ≤ f ≤ 100kHz  
A
90  
-
f = 120Hz, -18.5V ≥ V ≥ -28.5V  
T = +25°C  
J
I
RR  
34  
-
39  
-
-
dB  
V
V
T = +25°C  
J
1.7  
D
Note:  
1. Load and line regulation are specified at constant junction temperature. Change in V due to heating effects must be taken  
O
into account separately. Pulse testing with low duty is used.  
5
MC79LXXA/LM79LXXA  
Electrical Characteristics(MC79L18A) (Continued)  
(V = -27V, I = 40mA, C = 0.33µF, C = 0.1µF, 0°C ≤T ≤ +125°C, unless otherwise specified)  
I
O
I
O
J
Parameter  
Symbol  
Conditions  
Min. Typ. Max. Unit  
Output Voltage  
V
T = +25°C  
J
-17.3 -18.0 -18.7  
V
O
-20.7V ≥ V ≥ -33V  
-
-
-
-
325  
275  
mV  
I
Line Regulation (Note1)  
∆V  
∆V  
T = +25°C  
J
O
O
-21V ≥ V ≥ -33V  
mV  
I
1.0mA ≤ I ≤ 100mA  
-
-
-
170  
85  
mV  
mV  
V
O
Load Regulation (Note1)  
Output Voltage  
T = +25°C  
J
1.0mA ≤ I ≤ 40mA  
-
O
-20.7V > V > -33V, 1.0mA ≤ I ≤ 40mA -17.1  
-
-18.9  
-18.9  
6.5  
6.0  
1.5  
0.1  
-
I
O
V
O
V = -27V, 1.0mA ≤ I ≤ 70mA  
I
-17.1  
-
V
O
T = +25°C  
-
-
-
-
-
-
J
Quiescent Current  
I
mA  
Q
T = +125°C  
J
-
With Line  
With Load  
∆I  
∆I  
-21V ≥ V ≥ -33V  
-
-
mA  
mA  
µV  
Q
I
Quiescent Current  
Change  
1.0mA ≤ I ≤ 40mA  
Q
N
O
Output Noise Voltage  
Ripple Rejection  
Dropout Voltage  
V
T =+25°C,10Hz ≤ f ≤ 100kHz  
A
150  
f = 120Hz, -23V ≥ V ≥ -33V  
T = +25°C  
J
I
RR  
33  
-
48  
-
-
dB  
V
V
T = +25°C  
J
1.7  
D
Note:  
1. Load and line regulation are specified at constant junction temperature. Change in V due to heating effects must be taken  
O
into account separately. Pulse testing with low duty is used.  
6
MC79LXXA/LM79LXXA  
Electrical Characteristics(MC79L24A) (Continued)  
(V = -33V, I = 40mA, C = 0.33µF, C = 0.1µF, 0°C ≤T ≤ +125°C, unless otherwise specified)  
I
O
I
O
J
Parameter  
Symbol  
Conditions  
Min. Typ. Max. Unit  
Output Voltage  
V
T = +25°C  
J
-23  
-
-24  
-
-25  
V
O
-27V ≥ V ≥ -38V  
350  
mV  
I
Line Regulation (Note1)  
∆V  
∆V  
T = +25°C  
J
O
O
-28V ≥ V ≥ -38V  
-
-
300  
mV  
I
1.0mA ≤ I ≤ 100mA  
-
-
-
200  
100  
-25.2  
-25.2  
6.5  
mV  
mV  
V
O
Load Regulation (Note1)  
Output Voltage  
T = +25°C  
J
1.0mA ≤ I ≤ 40mA  
-
O
-27V ≥ V ≥ -38V, 1.0mA ≤ I ≤ 40mA -22.8  
-
I
O
V
O
V = -33V, 1.0mA ≤ I ≤ 70mA  
I
-22.8  
-
V
O
T = +25°C  
J
-
-
-
-
-
-
Quiescent Current  
I
mA  
Q
T = +125°C  
J
-
6.0  
With Line  
With Load  
∆I  
∆I  
-28V ≥ V ≥ -38V  
-
-
1.5  
mA  
mA  
µV  
Q
I
Quiescent Current  
Change  
1.0mA ≤ I ≤ 40mA  
0.1  
Q
N
O
Output Noise Voltage  
Ripple Rejection  
Dropout Voltage  
V
T = +25°C,10Hz ≤ f ≤ 100kHz  
A
200  
-
f = 120Hz, -29V ≥ V ≥ -35V  
T = +25°C  
J
I
RR  
31  
-
47  
-
-
dB  
V
V
T = +25°C  
J
1.7  
D
Note:  
1. Load and line regulation are specified at constant junction temperature. Change in V due to heating effects must be taken  
O
into account separately. Pulse testing with low duty is used.  
7
MC79LXXA/LM79LXXA  
Typical Application  
Design Considerations  
The MC79LXXA/LM79LXXA Series of fixed voltage regulators are designed with Thermal Overload Protection 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 lengths, 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 0.33µF 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.  
LM78LXXA  
MC78LXXA  
MC79LXXA  
LM79LXXA  
I
LM79LXXA  
MC79LXXA  
Figure 1. Positive And Negative Regulator  
Figure 2. Typical Application  
A common ground is required between the Input and the output voltages. The input voltage must remain typically 2.0V above  
the output voltage even during the low point on the input ripple voltage.  
* C is required if regulator is located an appreciable distance from power supply filter.  
1
* C improves stability and transient response.  
O
8
MC79LXXA/LM79LXXA  
Mechanical Dimensions  
Package  
Dimensions in millimeters  
TO-92  
+0.25  
–0.15  
4.58  
0.46 ±0.10  
+0.10  
–0.05  
1.27TYP  
1.27TYP  
0.38  
[1.27 ±0.20  
]
[1.27 ±0.20]  
3.60 ±0.20  
(R2.29)  
9
MC79LXXA/LM79LXXA  
Mechanical Dimensions (Continued)  
Package  
Dimensions in millimeters  
8-SOP  
0.1~0.25  
MIN  
0.004~0.001  
1.55 ±0.20  
0.061 ±0.008  
#8  
#5  
#1  
#4  
6.00 ±0.30  
0.236 ±0.012  
1.80  
0.071  
MAX  
3.95 ±0.20  
0.156 ±0.008  
5.72  
0.225  
0.50 ±0.20  
0.020 ±0.008  
10  
MC79LXXA/LM79LXXA  
Mechanical Dimensions (Continued)  
Package  
Dimensions in millimeters  
SOT-89  
1.50 ±0.20  
4.50 ±0.20  
1.65 ±0.10  
(0.40)  
C0.2  
0.50 ±0.10  
0.40 ±0.10  
+0.10  
–0.05  
0.40  
1.50 TYP 1.50 TYP  
11  
MC79LXXA/LM79LXXA  
Ordering Information  
Product Number  
Package  
Operating Temperature  
LM79L05ACZ  
TO-92  
0 ~ +125°C  
Product Number  
MC79L05ACP  
MC79L08ACP  
MC79L12ACP  
MC79L15ACP  
MC79L18ACP  
MC79L24ACP  
MC79L05ACD  
MC79L15ACD  
MC79L05ACH  
Package  
Operating Temperature  
TO-92  
0 ~ +125°C  
8-SOP  
SOT-89  
DISCLAIMER  
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY  
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY  
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER  
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.  
LIFE SUPPORT POLICY  
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES  
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR  
CORPORATION. As used herein:  
1. Life support devices or systems are devices or systems  
which, (a) are intended for surgical implant into the body,  
or (b) support or sustain life, and (c) whose failure to  
perform when properly used in accordance with  
instructions for use provided in the labeling, can be  
reasonably expected to result in a significant injury of the  
user.  
2. A critical component in any component of a life support  
device or system whose failure to perform can be  
reasonably expected to cause the failure of the life support  
device or system, or to affect its safety or effectiveness.  
www.fairchildsemi.com  
12/11/02 0.0m 001  
Stock#DSxxxxxxxx  
2002 Fairchild Semiconductor Corporation