LM79XX
LINEAR INTEGRATED CIRCUIT
3 TERMINAL 1A NEGATIVE
VOLTAGE REGULATOR
DESCRIPTION
The Contek LM79XX series of three-terminal negative
regulators are available in TO-220 package and with several
fixed output voltage, making them useful in a wide range of
application. Each type employs internal current limiting,
thermal shut-down and safe area protection, making it
essentially indestructible.
1
FEATURES
*Output current up to 1A
*-5V;-6V;-8V;-12V;-15V;-18V;-24V output voltage available
*Thermal overload protection
*Short circuit protection
TO-220
1:GND 2:Input 3:Output
BLOCK DIAGRAM
GND
R1
Voltage
reference
R2 OUTPUT
Protection
circuitry
RSC
Contek
INPUT
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
1
LM79XX
PARAMETER
Input voltage
Thermal resistance
junction-air
Thermal resistance
junction-cases
Operating Temperature
Storage Temperature
LINEAR INTEGRATED CIRCUIT
C)
ABSOLUTE MAXIMUM RATINGS
(Ta=25
SYMBOL
Vi
R
q
JA
R
q
JC
Topr
Tstg
VALUE
-35
65
5
0 ~ +125
-65 ~ +150
UNIT
V
C /W
C /W
C
C
Contek7905 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
,Io=500mA,Vi=-10V,Ci=33uF,Co=1uF, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short circuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-7V to -20V
Tj=25 C,Vi=-7V to -25V
Tj=25 C,Vi=-8V to -12V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-7V to -25V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-8V to -18V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-4.8
-5.0
-5.2
V
-4.75
-5.00
10
10
3
3
0.05
0.1
-0.4
100
60
2
300
2.2
-5.25
100
100
50
6
0.5
1.3
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
Contek7906 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
,Io=500mA,Vi=-11V,Ci=2.2uF,Co=1uF,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short circuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-8V to -21V
Tj=25 C,Vi=-8V to -25V
Tj=25 C,Vi=-9V to -13V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-8V to -25V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-9V to -19V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-5.75
-5.7
-6.00
-6.0
10
5
10
3
3
6-.25
-6.3
120
60
120
60
6
0.5
1.3
V
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
-0.5
130
60
2
300
2.2
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
2
LM79XX
LINEAR INTEGRATED CIRCUIT
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-10.5V to -23V
Tj=25 C,Vi=-10.5V to -25V
Tj=25 C,Vi=-11.5V to -17V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-11.5V to -25V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-11.5V to -21.5V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-7.7
-8.0
-8.3
V
Contek7908 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
,Io=500mA,Vi=-14V,Ci=2.2uF,Co=1uF,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short citcuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
-7.6
-8.0
10
5
12
4
3
0.05
0.1
-0.6
175
60
2
300
2.2
-8.4
100
80
160
80
6
0.5
1.0
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
Contek7912 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
,Io=500mA,Vi=-18V,Ci=2.2uF,Co=1uF,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short circuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-14.5V to -27V
Tj=25 C,Vi=-14.5V to -30V
Tj=25 C,Vi=-16V to -22V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-14.5V to -30V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-15V to -25V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-11.5
-12.0
-12
12
6
12
4
3
0.05
0.1
-0.8
200
60
2
300
2.2
-12.5
V
-11.4
-12.6
240
120
240
120
6
0.5
1.0
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
3
LM79XX
LINEAR INTEGRATED CIRCUIT
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-17.5V to -30V
Tj=25 C,Vi=-17.5V to -30V
Tj=25 C,Vi=-20V to -26V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-17.5V to -30.5V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-18.5V to -28.5V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-14.4
-15.0
-15
12
6
12
4
3
0.05
0.1
-0.9
250
60
2
300
2.2
-15.6
V
Contek7915 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
, Io=500mA,Vi=-23V,Ci=2.2uF,Co=1uF,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short circuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
-14.25
-15.75
300
150
300
150
6
0.5
1.0
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
Contek7918 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
,Io=500mA,Vi=-27V,Ci=2.2uF,Co=1uF,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short circuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-21V to -33V
Tj=25 C,Vi=-21V to -33V
Tj=25 C,Vi=-24V to -30V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-21V to -32V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-22V to -32V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-17.3
-18.0
-18
15
8
15
5.0
3
-18.7
V
-17.1
-18.9
360
180
360
180
6
0.5
1.0
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
-1
300
60
2
300
2.2
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
4
LM79XX
LINEAR INTEGRATED CIRCUIT
Tj=25 C
5.0mA<Io<1.0A,Po<15W
Vi=-27V to -38V
Tj=25 C,Vi=-27V to -38V
Tj=25 C,Vi=-30V to -36V
Tj=25 C,Io=5.0mA to 1.5A
Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A
Vi=-27V to -38V
Io=5mA
f=10hz to 100kHz,Ta=25 C
f=120Hz, Vi=-28V to -38V
Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C
-23
-24
-25
V
Contek7924 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0<Tj<125
C
,Io=500mA,Vi=-33V,Ci=2.2uF,Co=1uF,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output voltage
Line regulation
Load regulation
Quiescent current
Quiescent current change
Output voltage drift
Output noise voltage
Ripple rejection
Dropout voltage
Short circuit current
peak current
Vo
DVo
DVo
I
Q
DI
Q
DVo/DT
V
N
RR
Vo
Isc
Ipk
-22.8
-24
15
8
15
5.0
3
-25.2
480
240
480
240
6
0.5
1.0
V
mV
mV
mV
mV
mA
mA
mA
mV/ C
mV
dB
V
mA
A
54
-1
400
60
2
300
2.2
APPLICATION CIRCUITS
C1
2.2
mF
1
-Vi
2
C0
1
mF
-Vo
Contek
LM79XX
3
Fig.1 Fixed output regulator
+20V
1
0.33
mF
Contek
LM7815
2
+15V
3
0.1
mF
1N4001
2.2
mF
2
-20V
1
1
mF
3
1N4001
Contek
LM7915
-15V
Fig.2 Split power supply(+-15V,1A)
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
5
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