LM9074 LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control Literature Number: SNVS078E

L November2005 M 9 0 7 4 LM9074 S y s System Voltage Regulator with Keep-Alive ON/OFF t e m Control V General Description Design techniques have been employed to allow the regu- o lator to remain operational and not generate false reset l The LM9074 is a 5V, 3% accurate, 180 mA NPN voltage signalswhensubjectedtohighlevelsofRFenergy(300V/m ta regulator.Theregulatorfeaturesanactivelowdelayedreset from2MHzto400MHz). g output flag which can be used to reset a microprocessor e systemonturn-ONandintheeventthattheregulatoroutput Features R falls out of regulation for any reason.An external capacitor e programs a delay time interval before the reset output can n Automotiveapplicationreliability g returnhigh. n 3%outputvoltagetolerance u DesignedforautomotiveapplicationtheLM9074containsa n InsensitivetoradiatedRFI la varietyofprotectionfeaturessuchasreversebattery,over- n Dropoutvoltagelessthan2.5Vwith180mAoutput t o voltageshutdown,thermalshutdown,inputtransientprotec- current r tionandawideoperatingtemperaturerange. n Externallyprogrammedresetdelayinterval w Auniquetwo-inputlogiccontrolschemeisusedtoenableor n Keep-alivefeaturewith2logiccontrolinputs i disable the regulator output.An ON/OFF input can be pro- n +40VLoaddumptransientprotection th vided by an ignition switch derived signal while a second, n Thermalshutdown K Keep-Alive input, is generated by a system controller. This n Shortcircuitprotectionanddisablesafetyfeatures e allows for a system to remain ON after ignition has been n Reversebatteryprotection e switched OFF. The system controller can then execute a n LowOFFquiescentcurrent,60µAmaximum p power-downroutineandafterwhichcommandtheregulator - n Wideoperatingtemperaturerange−40˚Cto+125˚C A OFFtoalowquiescentcurrentstate(60µAmax). l i v e Connection Diagram and Ordering Information (Top View) O 14-PinSOPackage N / O F F C o n t r o l 10130502 OrderNumberLM9074M SeeNSPackageNumberM14A ©2005NationalSemiconductorCorporation DS101305 www.national.com

4 7 0 Absolute Maximum Ratings (Note 1) LeadTemperature 9 M (Soldering,10seconds) 260˚C L InputVoltage StorageTemperature −50˚Cto+150˚C ON/OFF,Keep-AliveInputs (through1kΩ) Operating Ratings DCInputVoltage −26Vto+26V (Note 1) PositiveInputTransient(t<100ms) 40V InputVoltage 7.5Vto16.5V NegativeInputTransient(t<1ms) −50V AmbientTemperature −40˚Cto+125˚C ResetOutputSinkCurrent 5mA θja,M14APackage 88˚C/W PowerDissipation InternallyLimited θjc,M14APackage 34˚C/W JunctionTemperature 150˚C ESDSusceptibility(Note2) 12kV,2kV Electrical Characteristics ThefollowingspecificationsapplyforV =7.5Vto16.5V,−40˚C≤T ≤125˚C,unlessotherwisespecified.C =0.1µF. CC A OUT Symbol Parameter Conditions Min Max Units REGULATOROUTPUT V OutputVoltage 20mA≤I ≤180mA 4.85 5.15 V OUT OUT ∆V Line LineRegulation I =20mA,9V≤V ≤16.5V 25 mV OUT OUT IN I =20mA,7.5V≤V ≤16.5V 50 mV OUT IN ∆V Load LoadRegulation V =14.4V,20mA≤I ≤180mA 50 mV OUT IN OUT Iq QuiescentCurrent 4V≤V ≤V 25 mA ON/OFF IN 20mA≤I ≤180mA OUT Ioff OFFQuiescentCurrent V ≤16.5V,RegulatorOFF IN −40˚C≤T ≤60˚C 20 µA J 60˚C≤T ≤135˚C 60 µA J Vdo DropoutVoltage I =20mA 2.0 V OUT I =180mA 2.5 V OUT Isc ShortCircuitCurrent R =1Ω 0.4 1.0 A L PSRR RippleRejection V =(14V )+(1V @ 120Hz) IN DC RMS I =50mA 60 dB OUT Voth SafetyV Latch-OFFThreshold InKeep-Alivemode OFF OUT V =0V,V =0V 4 4.5 V ON/OFF KA VoTransient V duringTransients V Peak≤40V, OUT IN 5.5 V R =100Ω,τ=100ms L RESETOUTPUT Vth ThresholdVoltage ∆V RequiredtoGenerateaReset OUT Output −300 −500 mV 4.85V≤V ≤5.15V OUT Vlow ResetOutputLowVoltage Isink=1.6mA,V > 3.2V 0.4 V OUT 1.4V≤V ≤3.2V 0.8 V OUT Vhigh ResetOutputHighVoltage 0.9V V V OUT OUT t DelayTime Cdelay=0.1µFd 7 45 ms delay I ChargingCurrentforCdelay −7 25 µA delay Rpu InternalPull-upResistance 12 80 kΩ CONTROLLOGIC V low LowInputThresholdVoltage, KA 3.5V≤V ≤5.25V 0.3V 0.5V V Keep-AliveInput OUT OUT OUT V high HighInputThresholdVoltage, KA 3.5V≤V ≤5.25V 0.6V 0.8V V Keep-AliveInput OUT OUT OUT V low LowInputVoltage,ON/OFFInput Rseries=1kΩ −2 2 V ON/OFF V high HighInputVoltage,ON/OFFInput Rseries=1kΩ 4 V V ON/OFF IN www.national.com 2

L Electrical Characteristics M (Continued) 9 ThefollowingspecificationsapplyforVCC=7.5Vto16.5V,−40˚C≤TA≤125˚C,unlessotherwisespecified.COUT=0.1µF. 074 Symbol Parameter Conditions Min Max Units CONTROLLOGIC I InputCurrent,ON/OFFInput V ≤4V 330 µA ON/OFF ON/OFF 4V < V < 7V 670 µA ON/OFF V ≥7V 10 mA ON/OFF Rpu InternalPull-upResistance, KA 20 100 kΩ Keep-AliveInput Rpd InternalPull-downResistance ON/OFF 50 210 kΩ ON/OFFInput Note1: AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatingsindicateconditionsforwhichthedevice isintendedtobefunctional,butdonotguaranteespecificperformancelimits.Forguaranteedspecificationsandconditions,seetheElectricalCharacteristics. Note2: AllpinswillsurviveanESDimpulseof±2000Vusingthehumanbodymodelof100pFdischargedthrougha1.5kΩresistor.Inaddition,inputpinsVINand theON/OFFinputwillwithstandtenpulsesof±12kVfroma150pFcapacitordischargedthrougha560Ωresistorwitheachpinbypassedwitha22nF,100V capacitor. Reset Operation and Protection Features 10130505 3 www.national.com

4 7 0 Typical Performance Characteristics 9 M L (TA=25˚Cunlessindicatedotherwise) TurnONCharacteristics TurnOFFCharacteristics 10130506 10130507 ResetDelayTime vsTemperature 10130513 ON/OFF, Keep-Alive and Safety Keep-AliveMode;TurnONwithON/OFFcontrol, Latch-Off Control Diagrams KeepoutputbiasedwithKeep-Aliveinput, TurnOFFwithKeep-Alive(Keep-Alivelowkeeps Note:IfKeep-Aliveisprovidedbyamicroprocessorpoweredbytheoutput outputON,Keep-AlivegoinghighturnsoutputOFF) voltageoftheLM9074,thelogic“1”voltagelevelwilltrackVOUTasthe regulatorturnsOFF. SimpleON/OFFcontrol (Keep-AliveinputmustbehightoturnOFFoutput) 10130519 10130518 www.national.com 4

L ON/OFF, Keep-Alive and Safety M SafetyLatchOFFofV wheninKeep-AliveMode 9 OUT 0 Latch-Off Control Diagrams (ON/OFFgoinghighrequiredtoturnOutputbackON) 7 4 (Continued) SwitchONwithON/OFFinput;Keepoutput biasedwithKeep-Alive;HoldouputONwith ON/OFF;TurnOFFwithON/OFFinput. (TemporaryKeep-AliveMode) 10130521 10130520 Control Logic Truth Table ON/OFF Keep-Alive Output Reset OperatingCondition Input Input Voltage Output L X 0V L Lowquiescentcurrentstandby(OFF)condition ↑ X 5V ↑ afterdelay OutputturnsON H X 5V H NormalONcondition ↓ H 0V L OutputturnsOFF ↓ L 5V H OutputkeptONbyKeep-AliveInput ↑ L 5V H OutputremainsON(orturnsON) H X ∆V ≥−300mV L Outputpulledoutofregulation,resetflaggenerated OUT L L V ≤4V L OutputlatchesOFF OUT 5 www.national.com

4 7 0 Block Diagram 9 M L 10130522 Application Information immunity to RFI the output bypass capacitor is important (47µFisrecommended). TheLM9074voltageregulatorhasbeenoptimizedforusein This regulator is suitable for applications where continuous microprocessor based automotive systems. Several unique connection to the battery is required (Refer to the Typical design features have been incorporated to address many Application Circuit ). ON/OFF control of the regulator and FMEA(FailureModeEffectsAnalysis)concernsforfail-safe systemcanbeaccomplishedbyswitchingtheON/OFFinput systemperformance. tothebatteryorignitionsupplyV supplythroughaSPST IN switch. If this input becomes open circuited, an internal FAULTTOLERANTFEATURES pull-down resistor ensures that the regulator turns OFF. While not specifically guaranteed due to production testing WhentheregulatorisswitchedOFFthecurrentloadonthe limitations,theLM9074hasbeentestedandshowntocon- batterydropstolessthan60µA.Withthepossibilityinmany tinue to provide a regulated output and, not generate an applications for V and the ON/OFF input pins to be con- erroneoussystemresetsignalwhilesubjectedtohighlevels IN nected in a system through long lengths of wire, the ESD of RF electric field energy (up to 300 V/m signal strength protectionofthesepinshasbeenincreasedto12kVwiththe over a 2 MHz to 400 MHz frequency range). This is very additionofsmallinputbypasscapacitors. important in vehicle safety related applications where the system must continue to operate normally.To maintain this www.national.com 6

L Application Information M (Continued) 9 0 7 4 10130523 FIGURE1.TypicalApplicationCircuit Anoutputbypasscapacitorofatleast0.1µFisrequiredfor oftheregulator.WhentheregulatorisswitchedON,conven- stability(47µFisrecommended).Aninputcapacitorof1µF tionalcurrentlimitingandthermalshutdownprotecttheregu- orlargerisrecommendedtoimprovelinetransientandnoise lator. When the regulator is switched OFF however, a performance. groundedV supplytothemicro(duetotheshortedregu- CC WiththeKeep-Aliveinput,asystemmicroprocessorhasthe lator output) will force the Keep-Alive input to be low and ability to keep the regulator ON (with a logic “0” on Keep- thustrytomaintaintheKeep-Alivemodeofoperation.With Alive)aftertheON/OFFinputhasbeencommandedOFF.A ashortedload,thedrainonthebatterycouldbeashighas power-downsequence,whensystemvariablesaretypically 1.5A.Aseparateinternalcircuitmonitorstheoutputvoltage storedinprogrammablememory,canbeexecutedandtake oftheregulator.IfVOUTislessthan4V,aswouldbethecase asmuchtimeasnecessary.Attheendoftheoperationthe withashortedload,theKeep-Alivefunctionislogicallydis- microthenpullsKeep-Alivehighandtheregulatorandsys- abledtoensurethattheregulatorturnsOFFandrevertsto temturnOFFandreverttothelowquiescentcurrentstandby lessthana60µAloadonthebattery. mode. For additional system reliability, consideration has been madeforthepossibilityofashortcircuitedloadattheoutput 10130524 FIGURE2.ControlLogicNotUsed Conventionalloaddumpprotectionisbuiltintowithstandup LM9071 is available ina5-leadTO-220packageand does to+60Vand−50Vtransients.A1kΩresistorinserieswith notprovidecontrollogicfunctions,butstillretainsallofthe the ON/OFF and Keep-Alive inputs are recommended to protectionfeaturesoftheLM9074. providethesameleveloftransientprotectionforthesepins if required. Protection against reverse polarity battery con- RESETFLAG nectionsisalsobuiltin.Withareversedbatterytheoutputof Excessiveloadingoftheoutputtothepointwheretheoutput theLM9074willnotgomorenegativethanonediodedrop voltagedropsby300mVto500mVwillsignalaresetflagto belowground.Thiswillpreventdamagetoanyofthe5Vload themicro.ThiswillwarnofaV supplythatmayproduce CC circuits. unpredictable operation of the system. On power-up and For applications where the control logic is not required the recoveryfromafaultconditionthedelaycapacitorisusedto logic pins should be configured as shown in Figure 2. A separate device, called the LM9071, can be used. The 7 www.national.com

4 7 90 Application Information (Continued) tDELAY=((3.4VxCDELAY)/IDELAY)) M ForaC valueof0.1µFandatypicalI of12µA, DELAY DELAY L holdthemicroinaresetconditionforaprogrammabletime thetypicaldelaytimewillbe: intervaltoallowthesystemoperatingvoltagesandclockto t =((3.4Vx0.1µF)/12µA))=28.3ms stabilizebeforeexecutingcode. DELAY The typical delay time interval can be estimated using the followingequation: 10130526 MICROPROCESSORSYSTEMREGULATORWITH OFFswitchhasbeenopenedandthesystemistobeturned KEEP-ALIVEINTERVALATTURN-OFF OFF. Upon detecting this high level at the ON/OFF Sense Thefollowingcircuitillustratesasystemapplicationutilizing input line, the controller can then perform a power down both of the logic control inputs of the LM9074. Closing the routine.Thesystemwillremainfullypowereduntilthecon- ON/OFFswitchpowersONthesystem.Oncepowered,the troller commands total shut down by taking the Keep-Alive system controller sets the Keep-Alive line low. The NPN linehigh.ThesystemthenshutsOFFandrevertstoavery transistor is used only to signal the controller that the ON/ lowcurrentdrainstandbyconditionuntilswitchedbackon. www.national.com 8

L Application Information M (Continued) 9 0 7 4 10130525 9 www.national.com

l o Physical Dimensions r inches (millimeters) unless otherwise noted t n o C F F O / N O e v i l A - p e e K h t i w r o t a l u g e R e g a t l o 14-Lead(0.150"Wide)MoldedSOPackage V OrderNumberLM9074M m NSPackageNumberM14A e t s y S 4 7 0 Nationaldoesnotassumeanyresponsibilityforuseofanycircuitrydescribed,nocircuitpatentlicensesareimpliedandNationalreserves 9 therightatanytimewithoutnoticetochangesaidcircuitryandspecifications. M Forthemostcurrentproductinformationvisitusatwww.national.com. L LIFESUPPORTPOLICY NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMS WITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTANDGENERALCOUNSELOFNATIONALSEMICONDUCTOR CORPORATION.Asusedherein: 1. Life support devices or systems are devices or systems 2. A critical component is any component of a life support which,(a)areintendedforsurgicalimplantintothebody,or deviceorsystemwhosefailuretoperformcanbereasonably (b)supportorsustainlife,andwhosefailuretoperformwhen expected to cause the failure of the life support device or properly used in accordance with instructions for use system,ortoaffectitssafetyoreffectiveness. providedinthelabeling,canbereasonablyexpectedtoresult inasignificantinjurytotheuser. BANNEDSUBSTANCECOMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products StewardshipSpecification(CSP-9-111C2)andtheBannedSubstancesandMaterialsofInterestSpecification(CSP-9-111S2)andcontain no‘‘BannedSubstances’’asdefinedinCSP-9-111S2. LeadfreeproductsareRoHScompliant. NationalSemiconductor NationalSemiconductor NationalSemiconductor NationalSemiconductor AmericasCustomer EuropeCustomerSupportCenter AsiaPacificCustomer JapanCustomerSupportCenter SupportCenter Fax: +49(0)180-5308586 SupportCenter Fax:81-3-5639-7507 Email:new.feedback@nsc.com Email: europe.support@nsc.com Email:ap.support@nsc.com Email:jpn.feedback@nsc.com Tel:1-800-272-9959 Deutsch Tel: +49(0)6995086208 Tel:81-3-5639-7560 English Tel: +44(0)8702402171 www.national.com FrançaisTel: +33(0)141918790

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