LM9074 TI1 | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 12

Technical content

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

System Voltage Regulator with Keep-Alive ON/OFF Control General Description The LM9074 is a 5V, 3% accurate, 180 mA NPN voltage regulator. The regulator features an active low delayed reset output flag which can be used to reset a microprocessor system on turn-ON and in the event that the regulator output falls out of regulation for any reason. An external capacitor programs a delay time interval before the reset output can return high. Designed for automotive application the LM9074 contains a variety of protection features such as reverse battery, over- voltage shutdown, thermal shutdown, input transient protec- tion and a wide operating temperature range. A unique two-input logic control scheme is used to enable or disable the regulator output. An ON/OFF input can be pro- vided by an ignition switch derived signal while a second, Keep-Alive input, is generated by a system controller. This allows for a system to remain ON after ignition has been switched OFF. The system controller can then execute a power-down routine and after which command the regulator OFF to a low quiescent current state (60 µA max). Design techniques have been employed to allow the regu- lator to remain operational and not generate false reset signals when subjected to high levels of RF energy (300V/m from 2 MHz to 400 MHz).

Features

n Automotive application reliability n 3% output voltage tolerance n Insensitive to radiated RFI n Dropout voltage less than 2.5V with 180mA output current n Externally programmed reset delay interval n Keep-alive feature with 2 logic control inputs n +40V Load dump transient protection n Thermal shutdown n Short circuit protection and disable safety features n Reverse battery protection n Low OFF quiescent current, 60µA maximum n Wide operating temperature range −40˚C to +125˚C Connection Diagram and Ordering Information(Top View) 14-Pin SO Package 10130502 Order Number LM9074M See NS Package Number M14A November 2005 LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control © 2005 National Semiconductor Corporation DS101305 www.national.com

Absolute Maximum Ratings(Note 1) Input Voltage ON/OFF, Keep-Alive Inputs (through 1 kΩ) DC Input Voltage −26V to +26V Positive Input Transient (t <100 ms) 40V Negative Input Transient (t <1 ms) −50V Reset Output Sink Current 5 mA Power Dissipation Internally Limited Junction Temperature 150˚C ESD Susceptibility (Note 2) 12 kV, 2 kV Lead Temperature (Soldering, 10 seconds) 260˚C Storage Temperature −50˚C to +150˚C Operating Ratings(Note 1) Input Voltage 7.5V to 16.5V Ambient Temperature −40˚C to +125˚C θja, M14A Package 88˚C/W θjc, M14A Package 34˚C/W

Electrical Characteristics

Symbol Parameter Conditions Min Max Units REGULATOR OUTPUT V OUT Output Voltage 20 mA ≤ IOUT ≤ 180 mA 4.85 5.15 V ∆VOUT Line Line Regulation I OUT = 20 mA, 9V ≤ VIN ≤ 16.5V IOUT = 20 mA, 7.5V ≤ VIN ≤ 16.5V mV mV ∆VOUT Load Load Regulation V IN = 14.4V, 20 mA ≤ IOUT ≤ 180 mA 50 mV Iq Quiescent Current 4V ≤ VON/OFF ≤ VIN 20mA ≤ IOUT ≤ 180mA 25 mA Ioff OFF Quiescent Current V IN ≤ 16.5V, Regulator OFF 60˚C ≤ TJ ≤ 135˚C µA µA Vdo Dropout Voltage I OUT =2 0m A IOUT = 180 mA 2.0 2.5 V V Isc Short Circuit Current R L =1 Ω 0.4 1.0 A PSRR Ripple Rejection V IN = (14VDC) + (1VRMS @ 120Hz) IOUT =5 0m A 6 0 d B VothOFF Safety VOUT Latch-OFF Threshold In Keep-Alive mode VON/OFF = 0V, VKA = 0V 4 4.5 V Vo Transient V OUT during Transients V IN Peak ≤ 40V, RL = 100Ω, τ = 100 ms 5.5 V RESET OUTPUT Vth Threshold Voltage ∆VOUT Required to Generate a Reset Output 4.85V ≤ V OUT ≤ 5.15V −300 −500 mV Vlow Reset Output Low Voltage Isink = 1.6 mA, V OUT > 3.2V 0.4 V 1.4V ≤ VOUT ≤ 3.2V 0.8 V Vhigh Reset Output High Voltage 0.9 V OUT VOUT V tdelay Delay Time Cdelay = 0.1 µFd 7 45 ms Idelay Charging Current for Cdelay −7 25 µA Rpu Internal Pull-up Resistance 12 80 k Ω CONTROL LOGIC V KAlow Low Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 0.3 V OUT 0.5 VOUT V VKAhigh High Input Threshold Voltage, Keep-Alive Input 3.5V ≤ VOUT ≤ 5.25V 0.6 V OUT 0.8 VOUT V VON/OFF low Low Input Voltage, ON/OFF Input Rserie s=1k Ω −2 2 V VON/OFF high High Input Voltage, ON/OFF Input Rserie s=1k Ω 4V IN V LM9074 www.national.com 2

Electrical Characteristics (Continued) Symbol Parameter Conditions Min Max Units CONTROL LOGIC I ON/OFF Input Current, ON/OFF Input V ON/OFF ≤ 4V 330 µA 4V < VON/OFF < 7V 670 µA VON/OFF ≥ 7V 10 mA RpuKA Internal Pull-up Resistance, Keep-Alive Input 20 100 k Ω RpdON/OFF Internal Pull-down Resistance ON/OFF Input 50 210 k Ω Note 1: Absolute Maximum Ratingsindicate limits beyond which damage to the device may occur. Operating Ratingsindicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and conditions, see the Electrical Characteristics. Note 2: All pins will survive an ESD impulse of ±2000V using the human body model of 100 pF discharged through a 1.5 kΩ resistor. In addition, input pins VIN and the ON/OFF input will withstand ten pulses of ±12 kV from a 150 pF capacitor discharged through a 560 Ω resistor with each pin bypassed with a 22 nF, 100V capacitor. Reset Operation and Protection Features 10130505 LM9074 www.national.com3

Typical Performance Characteristics (TA = 25˚C unless indicated otherwise) Turn ON Characteristics Turn OFF Characteristics 10130506 10130507 Reset Delay Time vs Temperature 10130513 ON/OFF, Keep-Alive and Safety Latch-Off Control Diagrams Note: If Keep-Alive is provided by a microprocessor powered by the output voltage of the LM9074, the logic “1” voltage level will track VOUT as the regulator turns OFF. Simple ON/OFF control (Keep-Alive input must be high to turn OFF output) 10130518 Keep-Alive Mode; Turn ON with ON/OFF control, Keep output biased with Keep-Alive input, Turn OFF with Keep-Alive (Keep-Alive low keeps output ON, Keep-Alive going high turns output OFF) 10130519 LM9074 www.national.com 4

ON/OFF, Keep-Alive and Safety Latch-Off Control Diagrams (Continued) Switch ON with ON/OFF input; Keep output biased with Keep-Alive; Hold ouput ON with ON/OFF; Turn OFF with ON/OFF input. (Temporary Keep-Alive Mode) 10130520 Safety Latch OFF of VOUT when in Keep-Alive Mode (ON/OFF going high required to turn Output back ON) 10130521 Control Logic Truth Table ON/OFF Input Keep-Alive Input Output Voltage Reset Output Operating Condition L X 0V L Low quiescent current standby (OFF) condition ↑ X5 V ↑ after delay Output turns ON H X 5V H Normal ON condition ↓ H 0V L Output turns OFF ↓ L 5V H Output kept ON by Keep-Alive Input ↑ L 5V H Output remains ON (or turns ON) HX ∆VOUT ≥ −300 mV L Output pulled out of regulation, reset flag generated LL V OUT ≤ 4V L Output latches OFF LM9074 www.national.com5

Application Information

The LM9074 voltage regulator has been optimized for use in microprocessor based automotive systems. Several unique design features have been incorporated to address many FMEA (Failure Mode Effects Analysis) concerns for fail-safe system performance. FAULT TOLERANT FEATURES While not specifically guaranteed due to production testing limitations, the LM9074 has been tested and shown to con- tinue to provide a regulated output and, not generate an erroneous system reset signal while subjected to high levels of RF electric field energy (up to 300 V/m signal strength over a 2 MHz to 400 MHz frequency range). This is very important in vehicle safety related applications where the system must continue to operate normally. To maintain this immunity to RFI the output bypass capacitor is important (47 µF is recommended). This regulator is suitable for applications where continuous connection to the battery is required ( Refer to the Typical Application Circuit ). ON/OFF control of the regulator and system can be accomplished by switching the ON/OFF input to the battery or ignition supply V IN supply through a SPST switch. If this input becomes open circuited, an internal pull-down resistor ensures that the regulator turns OFF. When the regulator is switched OFF the current load on the battery drops to less than 60 µA. With the possibility in many applications for V IN and the ON/OFF input pins to be con- nected in a system through long lengths of wire, the ESD protection of these pins has been increased to 12 kV with the addition of small input bypass capacitors. LM9074 www.national.com 6

Application Information (Continued) hold the micro in a reset condition for a programmable time interval to allow the system operating voltages and clock to stabilize before executing code. The typical delay time interval can be estimated using the following equation: t DELAY = ((3.4V x C DELAY)/I DELAY)) F o raCDELAY value of 0.1 µF and a typical I DELAY of 12 µA, the typical delay time will be: tDELAY = ((3.4V x 0.1 µF) / 12 µA)) = 28.3 ms 10130526 MICROPROCESSOR SYSTEM REGULATOR WITH KEEP-ALIVE INTERVAL AT TURN-OFF The following circuit illustrates a system application utilizing both of the logic control inputs of the LM9074. Closing the ON/OFF switch powers ON the system. Once powered, the system controller sets the Keep-Alive line low. The NPN transistor is used only to signal the controller that the ON/ OFF switch has been opened and the system is to be turned OFF. Upon detecting this high level at the ON/OFF Sense input line, the controller can then perform a power down routine. The system will remain fully powered until the con- troller commands total shut down by taking the Keep-Alive line high. The system then shuts OFF and reverts to a very low current drain standby condition until switched back on. LM9074 www.national.com 8

Application Information (Continued) 10130525 LM9074 www.national.com9

Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead (0.150" Wide) Molded SO Package Order Number LM9074M National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. Leadfree products are RoHS compliant. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control

Texas InstrumentsIncorporatedand itssubsidiaries(TI)reservetherighttomake corrections,modifications,enhancements,improvements, and otherchanges toitsproductsand servicesatany timeand todiscontinueany productorservicewithoutnotice.Customersshould obtainthelatestrelevantinformationbeforeplacingordersand shouldverifythatsuch informationiscurrentand complete.Allproductsare soldsubjecttoTI’s termsand conditionsofsalesuppliedatthetimeoforderacknowledgment. TIwarrantsperformanceofitshardwareproductstothespecificationsapplicableatthetimeofsaleinaccordancewithTI’s standard warranty.Testingand otherqualitycontroltechniquesareused totheextentTIdeems necessarytosupportthiswarranty.Exceptwhere mandated by governmentrequirements,testingofallparametersofeach productisnotnecessarilyperformed. TIassumes no liabilityforapplicationsassistanceorcustomerproductdesign.Customersareresponsiblefortheirproductsand applicationsusingTIcomponents.To minimizetherisksassociatedwithcustomerproductsand applications,customersshouldprovide adequatedesignand operatingsafeguards. TIdoes notwarrantorrepresentthatany license,eitherexpressorimplied,isgrantedunderany TIpatentright,copyright,mask work right, orotherTIintellectualpropertyrightrelatingtoany combination,machine,orprocessinwhichTIproductsorservicesareused.Information publishedby TIregardingthird-partyproductsorservicesdoes notconstitutea licensefromTItouse such productsorservicesora warrantyorendorsementthereof.Use ofsuch informationmay requirea licensefroma thirdpartyunderthepatentsorotherintellectual propertyofthethirdparty,ora licensefromTIunderthepatentsorotherintellectualpropertyofTI. ReproductionofTIinformationinTIdatabooks ordatasheetsispermissibleonlyifreproductioniswithoutalterationand isaccompanied by allassociatedwarranties,conditions,limitations,and notices.Reproductionofthisinformationwithalterationisan unfairand deceptive businesspractice.TIisnotresponsibleorliableforsuch altereddocumentation.Informationofthirdpartiesmay be subjecttoadditional restrictions. ResaleofTIproductsorserviceswithstatementsdifferentfromorbeyond theparametersstatedby TIforthatproductorservicevoidsall expressand any impliedwarrantiesfortheassociatedTIproductorserviceand isan unfairand deceptivebusinesspractice.TIisnot responsibleorliableforany such statements. TIproductsarenotauthorizedforuse insafety-criticalapplications(suchas lifesupport)where a failureoftheTIproductwouldreasonably be expectedtocause severepersonalinjuryordeath,unlessofficersofthepartieshave executedan agreementspecificallygoverning such use.Buyersrepresentthattheyhave allnecessaryexpertiseinthesafetyand regulatoryramificationsoftheirapplications,and acknowledgeand agreethattheyaresolelyresponsibleforalllegal,regulatoryand safety-relatedrequirementsconcerningtheirproducts and any use ofTIproductsinsuch safety-criticalapplications,notwithstandingany applications-relatedinformationorsupportthatmay be providedby TI.Further,Buyersmust fullyindemnifyTIand itsrepresentativesagainstany damages arisingoutoftheuse ofTIproductsin such safety-criticalapplications. TIproductsareneitherdesignednorintendedforuse inmilitary/aerospaceapplicationsorenvironmentsunlesstheTIproductsare specificallydesignatedby TIas military-gradeor"enhanced plastic." Onlyproductsdesignatedby TIas military-grademeet military specifications.Buyersacknowledgeand agreethatany such use ofTIproductswhichTIhas notdesignatedas military-gradeissolelyat theBuyer's risk,and thattheyaresolelyresponsibleforcompliancewithalllegaland regulatoryrequirementsinconnectionwithsuch use. TIproductsareneitherdesignednorintendedforuse inautomotiveapplicationsorenvironmentsunlessthespecificTIproductsare designatedby TIas compliantwithISO/TS 16949 requirements.Buyersacknowledgeand agreethat,iftheyuse any non-designated productsinautomotiveapplications,TIwillnotbe responsibleforany failuretomeet such requirements. FollowingareURLs where you can obtaininformationon otherTexas Instrumentsproductsand applicationsolutions: Products Applications Audio www.ti.com/audio Communicationsand Telecom www.ti.com/communications Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps DLP ® Products www.dlp.com Energyand Lighting www.ti.com/energy DSP dsp.ti.com Industrial www.ti.com/industrial Clocksand Timers www.ti.com/clocks Medical www.ti.com/medical Interface interface.ti.com Security www.ti.com/security Logic logic.ti.com Space,Avionicsand Defense www.ti.com/space-avionics-defense Power Mgmt power.ti.com Transportationand Automotive www.ti.com/automotive Microcontrollers microcontroller.ti.com Videoand Imaging www.ti.com/video RFID www.ti-rfid.com OMAP MobileProcessors www.ti.com/omap WirelessConnectivity www.ti.com/wirelessconnectivity TIE2E Community Home Page e2e.ti.com MailingAddress:Texas Instruments,PostOfficeBox 655303,Dallas,Texas 75265 Copyright© 2011,Texas InstrumentsIncorporated