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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, 0Output 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 IQ DIQ DVo/DT VN RR Vo Isc Ipk Tj=25 C 5.0mA54
Contek7906 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0Output 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 IQ DIQ DVo/DT VN RR Vo Isc Ipk Tj=25 C 5.0mA54
-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 5.0mAContek7908 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0Output 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 IQ DIQ DVo/DT VN 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, 0Output 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 IQ DIQ DVo/DT VN RR Vo Isc Ipk Tj=25 C 5.0mA54
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
3
LM79XX
LINEAR INTEGRATED CIRCUIT
Tj=25 C 5.0mAContek7915 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0Output 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 IQ DIQ DVo/DT VN 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, 0Output 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 IQ DIQ DVo/DT VN RR Vo Isc Ipk Tj=25 C 5.0mA54
-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 5.0mAContek7924 ELECTRICAL CHARACTERISTICS
(Refer to test circuits, 0Output 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 IQ DIQ DVo/DT VN 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
LM79XX
C1 2.2 mF
LINEAR INTEGRATED CIRCUIT
C3 2.5 mF 1 2 -Vi R1 C2 1 mF
Contek LM79XX
3
R2 -Vo
Fig.3 Circuit for increasing output voltage
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
6

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