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MC79XX (LM79XX) (KA79XX/A) FIXED VOLTAGE REGULATOR (NEGATIVE)
3-TERMINAL 1A NEGATIVE VOLTAGE REGULATORS
The MC79XX series of three-terminal negative regulators are available in
TO-220 package and with several fixed output voltages, making them useful
in a wide range of applications. Each type employs internal current limiting,
thermal shut-down and safe area protection, making it essentially indestructible.
FEATURES
Output Current in Excess of 1A
Output Voltages of -5, -6, -8, -12, -15, -18, -24V
Internal Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe-Area Compensation
Device
Output Voltage
Tolerance
Package
Operating Temperature
MC79XXCT (LM79XXCT) (KA79XX)
4%
KA79XXA
2%
TO-220
0 ~+125
C
VOLTAGE
REFERENCE
+
-
PROTECTION
CIRCUITRY
R1
R2
Rsc
GND
I1
I2
Out
In
Q1
Q2
TO-220
1: GND 2: Input 3: Output
ORDERING INFORMATION
BLOCK DIAGRAM
1999 Fairchild Semiconductor Corporation
Rev. C
MC79XX (LM79XX) (KA79XX/A) FIXED VOLTAGE REGULATOR (NEGATIVE)
ABSOLUTE MAXIMUM RATINGS
(T
A
=+25
C, unless otherwise specified)
LM7905 ELECTRICAL CHARACTERISTICS
(V
I
= 10V, l
O
= 500mA, 0
C
T
J
+
125
C, C
I
=2.2
F, C
O
=1
F, unless otherwise specified.)
* Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
Characteristic
Symbol
Value
Unit
Input Voltage
V
I
-35
V
Thermal Resistance Junction-Cases
Junction-Air
R
JC
R
JA
5
65
C / W
C /W
Operating Temperature Range
T
OPR
0 ~ +125
C
Storage Temperature Range
T
STG
- 65 ~ +150
C
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
T
J
=+25
C
- 4.8
- 5.0
- 5.2
Output Voltage
V
O
I
O
= 5mA to 1A, P
O
15W
V
I
= -7 to -20V
- 4.75
-5.0
- 5.25
V
V
I
= -7 to -20V
I
O
=1A
5
50
V
I
= -8 to -12V
I
O
=1A
2
25
V
I
= -7.5 to -25V
7
50
V
I
= -8 to -12V
I
O
=1A
7
50
I
O
= 5mA to 1.5A
10
100
T
J
=+25
C
I
O
= 250 to 750mA
3
50
Quiescent Current
I
Q
T
J
=+25
C
3
6
mA
I
O
= 5mA to 1A
0.05
0.5
V
I
= -8 to -25V
0.1
0.8
Temperature Coefficient of V
D
V
O
/
T
I
O
= 5mA
- 0.4
mV/
C
Output Noise Voltage
V
N
f = 10Hz to 100KHz
T
A
=+25
C
40
V
Ripple Rejection
RR
f = 120Hz, I
O
= -35V
V
I
= 10V
54
60
dB
Dropout Voltage
V
D
T
J
=+25
C
I
O
= 1A
2
V
Short Circuit Current
I
SC
T
J
=+25
C, V
I
= -35V
300
mA
Peak Current
I
PK
T
J
=+25
C
2.2
A
Load Regulation
V
O
Line Regulation
V
O
T
J
=25
C
mV
mV
Quiescent Current Change
I
Q
mA
MC79XX (LM79XX) (KA79XX/A) FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7906 ELECTRICAL CHARACTERISTICS
(V
I
= 11V, l
O
= 500mA, 0
C
T
J
+
125
C, C
I
=2.2
F, C
O
= 1
F, unless otherwise specified.)
* Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
T
J
= +25
C
- 5.75
- 6
- 6.25
Output Voltage
V
O
I
O
= 5mA to 1A, P
O
15W
V
I
= - 9 to - 21V
- 5.7
- 6
- 6.3
V
V
I
= - 8 to - 25V
10
120
V
I
= - 9 to -12V
5
60
T
J
=+ 25
C
I
O
= 5mA to 1.5A
10
120
T
J
=+ 25
C
I
O
= 250 to 750mA
3
60
Quiescent Current
I
Q
T
J
=+ 25
C
3
6
mA
I
O
= 5mA to 1A
0.5
V
I
= -9 to -25V
1.3
Temperature Coefficient of V
D
V
O
/
T
I
O
= 5mA
-0.5
mV/
C
Output Noise Voltage
V
N
f = 10Hz to 100KHz
T
A
=+ 25
C
130
V
Ripple Rejection
RR
f = 120Hz
V
I
= 10V
54
60
dB
Dropout Voltage
V
D
T
J
=+ 25
C
I
O
= 1A
2
V
Short Circuit Current
I
SC
T
J
= +25
C, V
I
= -35V
300
mA
Peak Current
I
PK
T
J
= +25
C
2.2
A
Line Regulation
V
O
T
J
= 25
C
V
O
Load Regulation
mV
mV
Quiescent Current Change
I
Q
mA
MC79XX (LM79XX) (KA79XX/A) FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7908 ELECTRICAL CHARACTERISTICS
(V
I
= 14V, l
O
= 500mA, 0
C
T
J
+
125
C, C
I
=2.2
F, C
O
= 1
F, unless otherwise specified.)
* Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
T
J
=+ 25
C
- 7.7
- 8
- 8.3
Output Voltage
V
O
I
O
= 5mA to 1A, P
O
15W
V
I
= -1.5 to -23V
- 7.6
- 8
- 8.4
V
V
I
= -10.5 to -25V
10
100
V
I
= -11 to -17V
5
80
T
J
=+ 25
C
I
O
= 5mA to 1.5A
12
160
T
J
=+ 25
C
I
O
= 250 to 750mA
4
80
Quiescent Current
I
Q
T
J
=+ 25
C
3
6
mA
I
O
= 5mA to 1A
0.05
0.5
V
I
= -11.5 to -25V
0.1
1
Temperature Coefficient of V
D
V
O
/
T
I
O
= 5mA
-0.6
mV/
C
Output Noise Voltage
V
N
f = 10Hz to 100KHz
T
A
=+ 25
C
175
V
Ripple Rejection
RR
f = 120Hz
V
I
= 10V
54
60
dB
Dropout Voltage
V
D
T
J
=+ 25
C
I
O
= 1A
2
V
Short Circuit Current
I
SC
T
J
=+ 25
C, V
I
= -35V
300
mA
Peak Current
I
PK
T
J
=+ 25
C
2.2
A
Line Regulation
V
O
Load Regulation
V
O
mV
mV
T
J
= 25
C
Quiescent Current Change
I
Q
mA
MC79XX (LM79XX) (KA79XX/A) FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7909 ELECTRICAL CHARACTERISTICS
(V
I
= 14V, l
O
= 500mA, 0
C
T
J
+
125
C, C
I
=2.2
F, C
O
= 1
F, unless otherwise specified)
* Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
T
J
=+ 25
C
- 8.7
- 9.0
- 9.3
Output Voltage
V
O
I
O
= 5mA to 1A, P
O
15W
V
I
= -1.5 to -23V
- 8.6
- 9.0
- 9.4
V
V
I
= -10.5 to -25V
10
180
V
I
= -11 to -17V
5
90
T
J
=+ 25
C
I
O
= 5mA to 1.5A
12
180
T
J
=+ 25
C
I
O
= 250 to 750mA
4
90
Quiescent Current
I
Q
T
J
=+ 25
C
3
6
mA
I
O
= 5mA to 1A
0.05
0.5
V
I
= -11.5 to -25V
0.1
1
Temperature Coefficient of V
D
V
O
/
T
I
O
= 5mA
-0.6
mV/
C
Output Noise Voltage
V
N
f = 10Hz to 100KHz
T
A
=+ 25
C
175
V
Ripple Rejection
RR
f = 120Hz
V
I
= 10V
54
60
dB
Dropout Voltage
V
D
T
J
=+ 25
C
I
O
= 1A
2
V
Short Circuit Current
I
SC
T
J
= +25
C, V
I
= -35V
300
mA
Peak Current
I
PK
T
J
=+25
C
2.2
A
Line Regulation
V
O
Load Regulation
V
O
mV
mV
T
J
= 25
C
Quiescent Current Change
I
Q
mA
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