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MSU ECE 4512 - Low Dropout CMOS Linear Regulators

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LP38690-ADJ/LP38692-ADJGeneral DescriptionFeaturesApplicationsTypical Application CircuitsConnection DiagramsPin DescriptionOrdering InformationAbsolute Maximum RatingsOperating RatingsElectrical CharacteristicsBlock DiagramsFIGURE 1. LP38690-ADJ Functional Diagram (LLP) FIGURE 2. LP38692-ADJ Functional Diagram (SOT-223, LLP) Typical Performance CharacteristicsApplication HintsEXTERNAL CAPACITORSSELECTING A CAPACITORCapacitor CharacteristicsPCB LAYOUTRFI/EMI SUSCEPTIBILITYOUTPUT NOISEPhysical DimensionsLP38690-ADJ/LP38692-ADJ1A Low Dropout CMOS Linear Regulators withAdjustable OutputStable with Ceramic Output CapacitorsGeneral DescriptionThe LP38690/2-ADJ low dropout CMOS linear regulatorsprovide 2.5% precision reference voltage, extremely lowdropout voltage (450mV@1A load current, VOUT= 5V) andexcellent AC performance utilizing ultra low ESR ceramicoutput capacitors.The low thermal resistance of the LLP and SOT-223 pack-ages allow the full operating current to be used even in highambient temperature environments.The use of a PMOS power transistor means that no DC basedrive current is required to bias it allowing ground pin currentto remain below 100 µA regardless of load current, inputvoltage, or operating temperature.Dropout Voltage: 450 mV (typ)@1A (typ. 5V out).Ground Pin Current: 55 µA (typ) at full load.Adjust Pin Voltage: 2.5% (25˚C) accuracy.Featuresn Output voltage range of 1.25V - 9Vn 2.5% adjust pin voltage accuracy (25˚C)n Low dropout voltage: 450mV@1A (typ, 5V out)n Wide input voltage range (2.7V to 10V)n Precision (trimmed) bandgap referencen Guaranteed specs for -40˚C to +125˚Cn 1µA off-state quiescent currentn Thermal overload protectionn Foldback current limitingn SOT-223 and 6-Lead LLP packagesn Enable pin (LP38692-ADJ)Applicationsn Hard Disk Drivesn Notebook Computersn Battery Powered Devicesn Portable InstrumentationTypical Application Circuits2012670120126702VOUT=VADJx (1 + R1/R2)Note: *Minimum value required for stability.January 2005LP38690-ADJ/LP38692-ADJ 1A Low Dropout CMOS Linear Regulators with Adjustable OutputStable with Ceramic Output Capacitors© 2005 National Semiconductor Corporation DS201267 www.national.comConnection Diagrams20126703SOT-223, Top ViewLP38692MP-ADJ201267046-Lead LLP, Bottom ViewLP38690SD-ADJ201267056-Lead LLP, Bottom ViewLP38692SD-ADJPin DescriptionPIN DESCRIPTIONVINThis is the input supply voltage to the regulator. For LLP package devices, both VINpins must betied together for full current operation (500mA maximum per pin).GND Circuit ground for the regulator. This is connected to the die through the lead frame, and alsofunctions as the heat sink when the large ground pad is soldered down to a copper plane.VOUTRegulated output voltage.VENThe enable pin allows the part to be turned ON and OFF by pulling this pin high or low.ADJ The adjust pin is used to set the regulated output voltage by connecting it to the external resistorsR1 and R2 (see Typical Application Circuit).Ordering InformationOrder Number Package Marking Package Type Package Drawing Supplied AsLP38690SD-ADJ L112B 6-Lead LLP SDE06A 1000 Units Tape and ReelLP38692SD-ADJ L122B 6-Lead LLP SDE06A 1000 Units Tape and ReelLP38692MP-ADJ LJNB SOT-223 MP05A 1000 Units Tape and ReelLP38690SDX-ADJ L112B 6-Lead LLP SDE06A 4500 Units Tape and ReelLP38692SDX-ADJ L122B 6-Lead LLP SDE06A 4500 Units Tape and ReelLP38692MPX-ADJ LJNB SOT-223 MP05A 2000 Units Tape and ReelLP38690-ADJ/LP38692-ADJwww.national.com 2Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.Storage Temperature Range −65˚C to +150˚CLead Temp. (Soldering, 5 seconds) 260˚CESD Rating (Note 3) 2 kVPower Dissipation (Note 2) Internally LimitedV(max) All pins (with respect to GND) -0.3V to 12VIOUTInternally LimitedJunction Temperature −40˚C to +150˚COperating RatingsVINSupply Voltage 2.7V to 10VOperating JunctionTemperature Range−40˚C to +125˚CElectrical Characteristics Limits in standard typeface are for TJ= 25˚C, and limits in boldface type applyover the full operating temperature range. Unless otherwise specified: VIN=VOUT+ 1V, CIN=COUT= 10 µF, ILOAD= 10mA.Min/Max limits are guaranteed through testing, statistical correlation, or design.Symbol Parameter Conditions MinTyp(Note 4)Max UnitsVADJADJ Pin VoltageVIN= 2.7V 1.219 1.25 1.281V3.2V ≤ VIN≤ 10V100 µA<IL<1A1.187 1.25 1.313∆VO/∆VINOutput Voltage Line Regulation(Note 6)VO+ 0.5V ≤ VIN≤ 10VIL= 25mA0.03 0.1 %/V∆VO/∆ILOutput Voltage Load Regulation(Note 7)1mA<IL<1AVIN=VO+1V1.8 5 %/AVIN-VODropout Voltage (Note 8)(VO= 1.8V)IL=1A950 1600mV(VO= 2.5V)IL= 0.1AIL=1A808001451300(VO= 3.3V)IL= 0.1AIL=1A656501101000(VO= 5V)IL= 0.1AIL=1A45450100800IQQuiescent Current VIN≤ 10V, IL= 100 µA - 1A 55 100µAVEN≤ 0.4V, (LP38692-ADJ Only) 0.001 1IL(MIN) Minimum Load Current VIN-VO≤ 4V 100IFBFoldback Current Limit VIN-VO>5V 450mAVIN-VO<4V 1500PSRR Ripple Rejection VIN=VO+ 2V(DC), with 1V(p-p) /120Hz Ripple55 dBTSDThermal Shutdown Activation(Junction Temp)160˚CTSD(HYST)Thermal Shutdown Hysteresis(Junction Temp)10IADJADJ Input Leakage Current VADJ= 0 - 1.5VVIN= 10V-100 0.01 100 nALP38690-ADJ/LP38692-ADJwww.national.com3Electrical Characteristics Limits in standard typeface are for TJ= 25˚C, and limits in boldface type applyover the full operating temperature range. Unless otherwise specified: VIN=VOUT+ 1V, CIN=COUT= 10 µF, ILOAD= 10mA.Min/Max limits are guaranteed through testing, statistical correlation, or design. (Continued)Symbol Parameter Conditions MinTyp(Note 4)Max UnitsenOutput Noise BW = 10Hz to 10kHzVO= 3.3V0.7µV/VO(LEAK) Output Leakage Current VO=VO(NOM) + [email protected] 2 µAVENEnable Voltage (LP38692-ADJOnly)Output = OFF 0.4VOutput = ON, VIN=4V 1.8Output = ON, VIN=6V 3.0Output = ON, VIN= 10V 4.0IENEnable Pin Leakage(LP38692-ADJ Only)VEN= 0V or 10V, VIN= 10V -1 0.001 1µANote 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the deviceis intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics. Specifications do notapply when operating the device outside of its rated operating conditions.Note 2: At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink values (if a heatsink


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MSU ECE 4512 - Low Dropout CMOS Linear Regulators

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