LM2990SX-12 ,Negative Low Dropout RegulatorElectrical Characteristics= = =V −5V+V (Note 6) , I 1A, C 47 μF, unless otherwise specified. Boldfa ..
LM2990SX-15 ,Negative Low Dropout RegulatorMICROCIRCUIT DATA SHEETOriginal Creation Date: 04/30/96MNLM2990-5.0-X REV 0B1Last Update Date: 03/0 ..
LM2990SX-15 ,Negative Low Dropout RegulatorGeneral DescriptionThe LM2990 is a low dropout, 1 ampere negative voltage regulator available with ..
LM2990SX-5.0 ,Negative Low Dropout RegulatorMICROCIRCUIT DATA SHEETOriginal Creation Date: 04/30/96MNLM2990-5.0-X REV 0B1Last Update Date: 03/0 ..
LM2990T-12 ,Negative Low Dropout RegulatorFeatures- 5% output accuracy over entire operating range - Output current in excess of 1A - Dropout ..
LM2990T-15 ,Negative Low Dropout RegulatorGeneral DescriptionThe LM2990 is a low dropout, 1 ampere negative voltage regulator available with ..
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LM2990SX-12
Negative Low Dropout Regulator
LM2990
Negative Low Dropout Regulator
General DescriptionThe LM2990isa three-terminal,low dropout,1 ampere
negative voltage regulator available with fixed output volt-
agesof−5, −5.2, −12,and −15V.
The LM2990 uses new circuit design techniquesto provide
low dropoutandlow quiescent current.The dropout voltage1A load currentis typically 0.6V anda guaranteed
worst-case maximumof1V overthe entire operating tem-
perature range. The quiescent currentis typically1mAwith load current andan input-output voltage differential
greater than3V.A unique circuit designofthe internal bias
supply limitsthe quiescent currentto only9mA (typical)
when theregulatorisinthe dropoutmode (VOUT −VIN ≤3V).
Output voltage accuracyis guaranteedto ±5% over load,
and temperature extremes.
The LM2990is short-circuit proof,and thermal shutdownin-
cludes hysteresisto enhancethe reliabilityofthe device
when overloadedforan extended periodof time. The
LM2990is availablein a3-leadTO-220 packageandis rated
for operation overthe automotive temperature rangeof
−40˚Cto +125˚C.
Features5% output accuracy over entire operating range Output currentin excessof1A Dropout voltage typically 0.6Vat1A load Low quiescent current Internal short circuit current limit Internal thermal shutdown with hysteresis Functional complementtothe LM2940 series
Applications Post switcher regulator Local, on-card, regulation Battery operated equipment
Typical Application
Ordering Information and Connection Diagrams
Temperature
Range
Output Voltage Package
-5.0 -5.2 -12 -15−40˚Cto
+125˚C
LM2990T-5.0 LM2990T-5.2 LM2990T-12 LM2990T-15 TO-220
LM2990S-5.0 LM2990S-12 LM2990S-15 TO-263
−55˚Cto
+125˚C
LM2990J-5.0-QML
5962-9571101QEA
LM2990J-12-QML
5962-9571001QEA
LM2990J-15-QML
5962-9570901QEA J16A
LM2990WG5.0-QML
5962-9571101QXA WG16A
DS010801-1
*Requiredifthe regulatoris locatedfurtherthan6 inchesfrom thepower supplyfilter capacitors.A1 μFsolid tantalumora10μF aluminum electrolyticcapacitoris recommended.
**Requiredfor stability.Mustbeatleasta10μF aluminum electrolytic ora1μFsolidtantalumto maintain stability.Maybe increased withoutboundtomaintain regulation during transients. Locatethe capacitorascloseas possibletothe regulator.The equivalentseries resistance (ESR)is critical,and
shouldbeless than10Ωover thesame operatingtemperature range asthe regulator.
June 1999
LM2990
Negative
Low
Dropout
Regulator 1999 National Semiconductor Corporation DS010801
