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UTC LM79XX
LINEAR INTEGRATED CIRCUIT
3 TERMINAL 1A NEGATIVE VOLTAGE REGULATOR
DESCRIPTION
The UTC 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 *Thermal overload protection *Short circuit protection available
TO-220
1:GND
2:Input
3:Output
BLOCK DIAGRAM
GND
R1
R2
OUTPUT
Voltage reference
Protection circuitry
RSC INPUT
UTC
UNISONIC TECHNOLOGIES
CO., LTD.
1
QW-R101-007,B
UTC LM79XX
PARAMETER
Input voltage Thermal resistance junction-air Thermal resistance junction-cases Operating Temperature Storage Temperature
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vi R JA R JC Topr Tstg
ABSOLUTE MAXIMUM RATINGS(Ta=25C)
VALUE
-35 65 5 0 ~ +125 -65 ~ +150
UNIT
V C /W C /W C C
UTC7905 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
UTC7906 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
-0.5 130 60 2 300 2.2
UTC
UNISONIC TECHNOLOGIES
CO., LTD.
2
QW-R101-007,B
UTC LM79XX
LINEAR INTEGRATED CIRCUIT
UTC7908 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
UTC7912 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
UTC
UNISONIC TECHNOLOGIES
CO., LTD.
3
QW-R101-007,B
UTC LM79XX
LINEAR INTEGRATED CIRCUIT
UTC7915 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
UTC7918 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
-1 300 60 2 300 2.2
UTC
UNISONIC TECHNOLOGIES
CO., LTD.
4
QW-R101-007,B
UTC LM79XX
LINEAR INTEGRATED CIRCUIT
UTC7924 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 Vo Vo IQ IQ Vo/T VN RR Vo Isc Ipk Tj=25C 5.0mA54
-1 400 60 2 300 2.2
APPLICATION CIRCUITS
C1 2.2 F 1 -Vi 2 C0 1 F -Vo
UTC LM79XX
3
Fig.1 Fixed output regulator
+20V 1 0.33 F +15V 3 0.1 F 1N4001
UTC LM7815
2
2.2 F 2 -20V
1
1 F 3
1N4001
UTC LM7915
-15V
Fig.2 Split power supply(+-15V,1A)
UTC
UNISONIC TECHNOLOGIES
CO., LTD.
5
QW-R101-007,B
UTC LM79XX
C1 2.2 F
LINEAR INTEGRATED CIRCUIT
C3 2.5 F 1 R2 2 R1 C2 1 F
UTC LM79XX
3 -Vo
-Vi
Fig.3 Circuit for increasing output voltage
UTC
UNISONIC TECHNOLOGIES
CO., LTD.
6
QW-R101-007,B

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