2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2
Features
Output Current up to 100mA
No External Components
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
Description
These regulators employ internal current limiting and
thermal shutdown, making them essentially indestructible.
TO-92
1
8-SOP
SOT-89
1
1.GND 2.Input 3.Output
1. Output 2.3.6.7. Input 5. GND 4.8. NC
1
Internal Block Diagram
Q1
Q2Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Q13
Q14
Q15
Q16
Q17
R1
R2
R3
R4
R5
R6
R7
R15
R16 R17
R18
R26
R22
R24
R25 R29
R
R28
R23+R21
R27
D3
D2
D1
C1
GND
Output
Input
MC79LXXA/LM79LXXA
3-Terminal 0.1A Negative Voltage Regulato
r
MC79LXXA/LM79LXXA
2
Absolute Maximum Ratings
Electrical Characteristics(MC79L05A/LM79L05A)
(V
I
= -10V, I
O
= 40mA, C
I
= 0.33
F, C
O
= 0.1
F, 0
C
T
J
+125
C, unless otherwise specified)
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Value
Unit
Input Voltage (for V
o
= -5V to -8V)
(for V
O
= -12V to -18V)
(for V
O
= -24V)
V
I
-30
-35
-40
V
Operating Temperature Range
T
OPR
0 ~ +125
C
Storage Temperature Range
T
STG
-65 ~ +150
C
Parameter
Symbol
Conditions
Min.
Typ. Max. Unit
Output Voltage
V
O
T
J
= +25
C
-4.8
-5.0
-5.2
V
Line Regulation (Note1)
V
O
T
J
=+25
C
-7.0V
V
I
-20V
-
15
150
mV
-8V
V
I
-20V
-
-
100
mV
Load Regulation (Note1)
V
O
T
J
=+25
C
1.0mA
I
O
100mA
-
20
60
mV
1.0mA
I
O
40mA
-
10
30
mV
Output Voltage
V
O
-7.0V
V
I
-20V, 1.0mA
I
O
40mA
-4.75
-
-5.25
V
V
I
= -10V, 1.0mA
I
O
70mA
-4.75
-
-5.25
V
Quiescent Current
I
Q
T
J
=+25
C
-
2.0
5.5
mA
T
J
= +125
C
-
-
6.0
Quiescent Current
Change
With Line
I
Q
-8V
V
I
-20V
-
-
1.5
mA
With Load
I
Q
1.0mA
I
O
40mA
-
-
0.1
mA
Output Noise Voltage
V
N
T
A
= +25
C,10Hz
f
100kHz
-
30
-
V
Ripple Rejection
RR
f = 120Hz, -8V
V
I
-18V
T
J
= +25
C
41
60
-
dB
Dropout Voltage
V
D
T
J
= +25
C
-
1.7
-
V
MC79LXXA/LM79LXXA
3
Electrical Characteristics (MC79L08A)
(Continued)
(V
I
= -14V, I
O
= 40mA, C
I
= 0.33
F, C
O
= 0.1
F, 0
C
T
J
+125
C, unless otherwise specified)
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ. Max. Unit
Output Voltage
V
O
T
J
= +25
C
-7.7
-8.0
-8.3
V
Line Regulation(Note1)
V
O
T
J
= +25
C
-10.3V
V
I
-23V
-
-
175
mV
-12V
V
I
-23V
-
-
125
mV
Load Regulation (Note1)
V
O
T
J
= +25
C
1.0mA
I
o
100mA
-
-
80
mV
1.0mA
I
o
40mA
-
-
40
mV
Output Voltage
V
O
-10.3V
V
I
-23V, 1.0mA
I
o
40mA
-7.6
-
-8.4
V
V
I
= -14V, 1.0mA
I
o
70mA
-7.6
-
-8.4
Quiescent Current
I
q
T
j
= +25
C
-
-
6.0
mA
T
j
= +125
C
-
-
5.5
Quiescent Current
Change
With Line
I
Q
-11.7V
V
I
-23V
-
-
1.5
mA
With Load
1.0mA
I
o
40mA
-
-
0.1
mA
Output Noise Voltage
V
N
T
j
= +25
C,10Hz
f
100kHz
-
50
-
V
Ripple Rejection
RR
f = 120Hz, -11V
V
I
-21V
T
j
= +25
C
39
55
-
dB
Dropout Voltage
V
D
T
j
= +25
C
-
1.7
-
V
MC79LXXA/LM79LXXA
4
Electrical Characteristics(MC79L12A)
(Continued)
(V
I
= -19V, I
O
= 40mA, C
I
= 0.33
F, C
O
= 0.1
F, 0
C
T
J
+125
C, unless otherwise specified)
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ. Max. Unit
Output Voltage
V
O
T
J
= +25
C
-11.5 -12.0 -12.5
V
Line Regulation (Note1)
V
O
T
J
= +25
C
-14.5V
V
I
-27V
-
-
250
mV
-16V
V
I
-27V
-
-
200
mV
Load Regulation (Note1)
V
O
T
J
= +25
C
1.0mA
I
O
100mA
-
-
100
mV
1.0mA
I
O
40mA
-
-
50
mV
Output Voltage
V
O
-14.5V
>
V
I
>
-27V, 1.0mA
I
O
40mA -11.4
-
-12.6
V
V
I
= -19V, 1.0mA
I
O
70mA
-11.4
-
-12.6
V
Quiescent Current
I
Q
T
J
= +25
C
-
-
6.0
mA
T
J
= +125
C
-
-
6.5
Quiescent Current
Change
With Line
I
Q
-16V
V
I
-27V
-
-
1.5
mA
With Load
I
Q
1.0mA
I
O
40mA
-
-
0.1
mA
Output Noise Voltage
V
N
T
A
= +25
C,10Hz
f
100kHz
-
80
-
V
Ripple Rejection
RR
f = 120Hz, -15V
V
I
-25V
T
J
= +25
C
37
42
-
dB
Dropout Voltage
V
D
T
J
= +25
C
-
1.7
-
V
MC79LXXA/LM79LXXA
5
Electrical Characteristics(MC79L15A)
(Continued)
(V
I
= -23V, I
O
= 40mA, C
I
= 0.33
F, C
O
= 0.1
F, 0
C
T
J
+125
C, unless otherwise specified)
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter
Symbol
Conditions
Min.
Typ.
Max. Unit
Output Voltage
V
O
T
J
= +25
C
-14.4 -15.0 -15.6
V
Line Regulation (Note1)
V
O
T
J
= +25
C
-17.5V
V
I
-30V
-
-
300
mV
-20V
V
I
-30V
-
-
250
mV
Load Regulation (Note1)
V
O
T
J
= +25
C
1.0mA
I
O
100mA
-
-
150
mV
1.0mA
I
O
40mA
-
-
75
mV
Output Voltage
V
O
-17.5V
V
I
-30V, 1.0mA
I
O
40mA -14.25
-
-15.75
V
V
I
= -23V, 1.0mA
I
O
70mA
-14.25
-
-15.75
V
Quiescent Current
I
Q
T
J
= +25
C
-
-
6.0
mA
T
J
= +125
C
-
-
6.5
Quiescent Current
Change
With Line
I
Q
-20V
V
I
-30V
-
-
1.5
mA
With Load
I
Q
1.0mA
I
O
40mA
-
-
0.1
mA
Output Noise Voltage
V
N
T
A
= +25
C,10Hz
f
100kHz
-
90
-
V
Ripple Rejection
RR
f = 120Hz, -18.5V
V
I
-28.5V
T
J
= +25
C
34
39
-
dB
Dropout Voltage
V
D
T
J
= +25
C
-
1.7
-
V
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