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LM79XX
LINEAR INTEGRATED CIRCUIT
1
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.
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
1:GND 2:Input 3:Output
BLOCK DIAGRAM
Voltage
reference
Protection
circuitry
GND
OUTPUT
INPUT
RSC
R2
R1
Contek
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
LM79XX
LINEAR INTEGRATED CIRCUIT
2
ABSOLUTE MAXIMUM RATINGS
(Ta=25 C)
PARAMETER
SYMBOL
VALUE
UNIT
Input voltage
Vi
-35
V
Thermal resistance
junction-air
R q
JA
65
C /W
Thermal resistance
junction-cases
R q
JC
5
C /W
Operating Temperature
Topr
0 ~ +125
C
Storage Temperature
Tstg
-65 ~ +150
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
Tj=25 C
-4.8
-5.0
-5.2
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-7V to -20V
-4.75
-5.00
-5.25
V
Line regulation
DVo
Tj=25 C,Vi=-7V to -25V
10
100
mV
Tj=25 C,Vi=-8V to -12V
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
10
100
mV
Tj=25 C,Io=250mA to 750mA
3
50
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.05
0.5
mA
Vi=-7V to -25V
0.1
1.3
mA
Output voltage drift
DVo/DT
Io=5mA
-0.4
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
100
mV
Ripple rejection
RR
f=120Hz, Vi=-8V to -18V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short circuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
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
Tj=25 C
-5.75
-6.00
6-.25
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-8V to -21V
-5.7
-6.0
-6.3
V
Line regulation
DVo
Tj=25 C,Vi=-8V to -25V
10
120
mV
Tj=25 C,Vi=-9V to -13V
5
60
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
10
120
mV
Tj=25 C,Io=250mA to 750mA
3
60
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.5
mA
Vi=-8V to -25V
1.3
mA
Output voltage drift
DVo/DT
Io=5mA
-0.5
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
130
mV
Ripple rejection
RR
f=120Hz, Vi=-9V to -19V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short circuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
LM79XX
LINEAR INTEGRATED CIRCUIT
3
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
Tj=25 C
-7.7
-8.0
-8.3
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-10.5V to -23V
-7.6
-8.0
-8.4
V
Line regulation
DVo
Tj=25 C,Vi=-10.5V to -25V
10
100
mV
Tj=25 C,Vi=-11.5V to -17V
5
80
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
12
160
mV
Tj=25 C,Io=250mA to 750mA
4
80
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.05
0.5
mA
Vi=-11.5V to -25V
0.1
1.0
mA
Output voltage drift
DVo/DT
Io=5mA
-0.6
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
175
mV
Ripple rejection
RR
f=120Hz, Vi=-11.5V to -21.5V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short citcuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
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
Tj=25 C
-11.5
-12.0
-12.5
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-14.5V to -27V
-11.4
-12
-12.6
V
Line regulation
DVo
Tj=25 C,Vi=-14.5V to -30V
12
240
mV
Tj=25 C,Vi=-16V to -22V
6
120
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
12
240
mV
Tj=25 C,Io=250mA to 750mA
4
120
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.05
0.5
mA
Vi=-14.5V to -30V
0.1
1.0
mA
Output voltage drift
DVo/DT
Io=5mA
-0.8
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
200
mV
Ripple rejection
RR
f=120Hz, Vi=-15V to -25V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short circuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
LM79XX
LINEAR INTEGRATED CIRCUIT
4
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
Tj=25 C
-14.4
-15.0
-15.6
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-17.5V to -30V
-14.25
-15
-15.75
V
Line regulation
DVo
Tj=25 C,Vi=-17.5V to -30V
12
300
mV
Tj=25 C,Vi=-20V to -26V
6
150
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
12
300
mV
Tj=25 C,Io=250mA to 750mA
4
150
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.05
0.5
mA
Vi=-17.5V to -30.5V
0.1
1.0
mA
Output voltage drift
DVo/DT
Io=5mA
-0.9
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
250
mV
Ripple rejection
RR
f=120Hz, Vi=-18.5V to -28.5V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short circuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
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
Tj=25 C
-17.3
-18.0
-18.7
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-21V to -33V
-17.1
-18
-18.9
V
Line regulation
DVo
Tj=25 C,Vi=-21V to -33V
15
360
mV
Tj=25 C,Vi=-24V to -30V
8
180
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
15
360
mV
Tj=25 C,Io=250mA to 750mA
5.0
180
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.5
mA
Vi=-21V to -32V
1.0
mA
Output voltage drift
DVo/DT
Io=5mA
-1
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
300
mV
Ripple rejection
RR
f=120Hz, Vi=-22V to -32V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short circuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
LM79XX
LINEAR INTEGRATED CIRCUIT
5
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
Tj=25 C
-23
-24
-25
V
Output voltage
Vo
5.0mA<Io<1.0A,Po<15W
Vi=-27V to -38V
-22.8
-24
-25.2
V
Line regulation
DVo
Tj=25 C,Vi=-27V to -38V
15
480
mV
Tj=25 C,Vi=-30V to -36V
8
240
mV
Load regulation
DVo
Tj=25 C,Io=5.0mA to 1.5A
15
480
mV
Tj=25 C,Io=250mA to 750mA
5.0
240
mV
Quiescent current
I
Q
Tj=25 C
3
6
mA
Quiescent current change
DI
Q
Io=5mA to 1.0A
0.5
mA
Vi=-27V to -38V
1.0
mA
Output voltage drift
DVo/DT
Io=5mA
-1
mV/ C
Output noise voltage
V
N
f=10hz to 100kHz,Ta=25 C
400
mV
Ripple rejection
RR
f=120Hz, Vi=-28V to -38V
54
60
dB
Dropout voltage
Vo
Io=1.0A,Tj=25 C
2
V
Short circuit current
Isc
Vi=-35V,Ta=25 C
300
mA
peak current
Ipk
Tj=25 C
2.2
A
APPLICATION CIRCUITS
-Vi
-Vo
C1
2.2 mF
C0
1 mF
Contek
LM79XX
1
2
3
Fig.1 Fixed output regulator
Contek
LM7915
1
2
3
Contek
LM7815
1
2
3
2.2 mF
1 mF
0.1 mF
0.33 mF
+20V
+15V
-15V
-20V
1N4001
1N4001
Fig.2 Split power supply(+-15V,1A)
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
LM79XX
LINEAR INTEGRATED CIRCUIT
6
Contek
LM79XX
1
2
3
C1
2.2 mF
C3
2.5 mF
C2
1 mF
-Vo
-Vi
R1
R2
Fig.3 Circuit for increasing output voltage
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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