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MC79LXXA/LM79LXXA
3-Terminal 0.1A Negative Voltage Regulator
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
and -24V
Description
These regulators employ internal current limiting and
thermal shutdown, making them essentially indestructible.
TO-92
SOT-89
1
1
1.GND 2.Input 3.Output
8-SOP
1
1. Output 2.3.6.7. GND 4.5. NC 8. Input
Internal Block Diagram
Output
Input
Rev. 1.0.1
©2001 Fairchild Semiconductor Corporation
MC79LXXA/LM79LXXA
Absolute Maximum Ratings
Parameter
Input Voltage (for V
o
= -5V to -8V)
(for V
o
= -12V to -18V)
(for V
o
= -24V)
Operating Temperature Range
Storage Temperature Range
Symbol
V
I
T
OPR
T
STG
Value
-30
-35
-40
0 ~ +125
-65 ~ +150
Unit
V
°C
°C
Electrical Characteristics(MC79L05A/LM79L05A)
(V
I
= -10V, I
O
= 40mA, C
I
= 0.33µF, C
O
= 0.1µF, 0°C
≤T
J
≤
+125°C, unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Symbol
V
O
∆V
O
∆V
O
V
O
I
Q
with line
with load
∆I
Q
∆I
Q
V
N
RR
V
D
T
J
= +25
°C
T
J
=+25
°C
T
J
=+25
°C
-7.0V
≥
V
I
≥
-20V
-8V
≥
V
I
≥
-20V
1.0mA
≤
I
O
≤
100mA
1.0mA
≤
I
O
≤
40mA
Conditions
Min.
- 4.8
-
-
-
-
- 4.75
- 4.75
-
-
-
-
-
41
-
Typ.
- 5.0
15
-
20
10
-
-
2.0
-
-
-
30
60
1.7
Max.
- 5.2
150
100
60
30
- 5.25
- 5.25
5.5
6.0
1.5
0.1
-
-
-
Unit
V
mV
mV
mV
mV
V
V
mA
mA
mA
µV
dB
V
Load Regulation (Note1)
Output Voltage
Quiescent Current
Quiescent Current
Change
Output Noise Voltage
Ripple Rejection
Dropout Voltage
-7.0V
≥
V
I
≥
-20V, 1.0mA
≤
I
O
≤
40mA
V
I
= -10V, 1.0mA
≤
I
O
≤
70mA
T
J
=+ 25
°C
T
J
= +125
°C
-8V
≥
V
I
≥
-20V
1.0mA
≤
I
O
≤
40mA
T
A
= +25°C,10Hz
≤
f
≤
100KHz
f = 120Hz, -8V
≥
V
I
≥
-18V
T
J
= +25°C
T
J
= +25°C
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.
2
MC79LXXA/LM79LXXA
Electrical Characteristics (MC79L08A)
(V
I
= -14V, I
O
= 40mA, C
I
= 0.33µF, C
O
= 0.1µF, 0°C
≤T
J
≤
+125°C, unless otherwise specified)
Parameter
Output Voltage
Line Regulation(Note1)
Symbol
V
O
∆V
O
∆V
O
V
O
I
q
with line
with load
∆I
Q
V
N
RR
V
D
T
J
= +25
°C
T
J
=+25
°C
T
J
=+25
°C
-10.3V
≥
V
I
≥
-23V
-12V
≥
V
I
≥
-23V
1.0mA
≤
I
o
≤
100mA
1.0mA
≤
I
o
≤
40mA
Conditions
Min.
- 7.7
-
-
-
-
- 7.6
- 7.6
-
-
-
-
-
39
-
Typ.
- 8.0
-
-
-
-
-
-
-
-
-
-
50
55
1.7
Max. Unit
- 8.3
175
125
80
40
- 8.4
- 8.4
6.0
5.5
1.5
0.1
-
-
-
V
mV
mV
mV
mV
V
mA
mA
mA
µV
dB
V
Load Regulation (Note1)
Output Voltage
Quiescent Current
Quiescent Current
Change
-10.3V
≥
V
I
≥
-23V, 1.0mA
≤
I
o
≤
40mA
V
I
= -14V, 1.0mA
≤
I
o
≤
70mA
T
j
=+ 25
°C
T
j
= +125
°C
-11.7V
≥
V
I
≥
-23V
1.0mA
≤
I
o
≤
40mA
T
j
= +25°C,10Hz
≤
f
≤
100KHz
f = 120Hz, -11V
≥
V
I
≥
-21V
T
j
= +25°C
T
j
= +25°C
Output Noise Voltage
Ripple Rejection
Dropout Voltage
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.
3
MC79LXXA/LM79LXXA
Electrical Characteristics(MC79L12A)
(V
I
= -19V, I
O
= 40mA, C
I
= 0.33µF, C
O
= 0.1µF, 0°C
≤T
J
≤
+125°C, unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Symbol
V
O
∆V
O
∆V
O
V
O
I
Q
with line
with load
∆I
Q
∆I
Q
V
N
RR
V
D
T
J
= +25
°C
T
J
= +25
°C
T
J
= +25
°C
-14.5V
≥
V
I
≥
-27V
-16V
≥
V
I
≥
-27V
1.0mA
≤
I
O
≤
100mA
1.0mA
≤
I
O
≤
40mA
Conditions
Min.
-
-
-
-
-11.4
-
-
-
-
-
37
-
Typ.
-
-
-
-
-
-
-
-
-
-
80
42
1.7
Max.
250
200
100
50
-12.6
-12.6
6.0
6.5
1.5
0.1
-
-
-
Unit
V
mV
mV
mV
mV
V
V
mA
mA
mA
µV
dB
V
-11.5 -12.0 -12.5
Load Regulation (Note1)
Output Voltage
Quiescent Current
Quiescent Current
Change
Output Noise Voltage
Ripple Rejection
Dropout Voltage
-14.5V
>
V
I
>
-27V, 1.0mA
≤
I
O
≤
40mA -11.4
V
I
= -19V, 1.0mA
≤
I
O
≤
70mA
T
J
= +25
°C
T
J
= +125
°C
-16V
≥
V
I
≥
-27V
1.0mA
≤
I
O
≤
40mA
T
A
= +25°C,10Hz
≤
f
≤
100KHz
f = 120Hz, -15V≥ V
I
≥
-25V
T
J
= +25°C
T
J
= +25°C
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.
4
MC79LXXA/LM79LXXA
Electrical Characteristics(MC79L15A)
(V
I
= -23V, I
O
= 40mA, C
I
= 0.33µF, C
O
= 0.1µF, 0°C
≤T
J
≤
+125°C, unless otherwise specified)
Parameter
Output Voltage
Line Regulation (Note1)
Symbol
V
O
∆V
O
∆V
O
V
O
I
Q
∆I
Q
∆I
Q
V
N
RR
V
D
T
J
= +25
°C
T
J
= +25
°C
T
J
= +25
°C
-17.5V
≥
V
I
≥
-30V
-20V
≥
V
I
≥
-30V
1.0mA
≤
I
O
≤
100mA
1.0mA
≤
I
O
≤
40mA
Conditions
Min.
-
-
-
-
-14.25
-14.25
-
-
-
-
-
34
-
Typ.
-
-
-
-
-
-
-
-
-
-
90
39
1.7
Max.
300
250
150
75
-15.75
-15.75
6.0
6.5
1.5
0.1
-
-
-
Unit
V
mV
mV
mV
mV
V
V
mA
mA
mA
µV
dB
V
-14.4 -15.0 -15.6
Load Regulation (Note1)
Output Voltage
Quiescent Current
Quiescent Current with line
Change
with load
Output Noise Voltage
Ripple Rejection
Dropout Voltage
-17.5V
≥
V
I
≥
-30V, 1.0mA
≤
I
O
≤
40mA
V
I
= -23V, 1.0mA
≤
I
O
≤
70mA
T
J
= +25°C
T
J
= +125°C
-20V
≥
V
I
≥
-30V
1.0mA
≤
I
O
≤
40mA
T
A
= +25°C,10Hz
≤
f
≤
100KHz
f = 120Hz, -18.5V
≥
V
I
≥
-28.5V
T
J
= +25°C
T
J
= +25°C
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.
5
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