LP2950 - Voltage Regulator - Low Power Low, Dropout

1 DATA Semiconductor Components Industries, LLC, 1995 October, 2021 Rev. 341 Publication Order Number: LP2950 /DVoltage Regulator - LowPower Low, Dropout100 mALP2950, LP2951, NCV2951 The LP2950 and LP2951 are micropower Voltage regulators that arespecifically designed to maintain proper regulation with an extremelylow input to output Voltage differential. These devices feature a verylow quiescent bias current of 75 mA and are capable of supplyingoutput currents in excess of 100 mA. Internal current and thermallimiting protection is LP2951 has three additional features. The first is the ErrorOutput that can be used to signal external circuitry of an out ofregulation condition, or as a microprocessor Power on reset. Thesecond feature allows the output Voltage to be preset to V, V V output (depending on the version) or programmed from Vto 29 V. It consists of a pinned out resistor divider along with directaccess to the Error Amplifier feedback input.

2 The third feature isa Shutdown input that allows a logic level signal to turn off or turn onthe Regulator to the low input to output Voltage differential and bias currentspecifications, these devices are ideally suited for battery poweredcomputer, consumer, and industrial equipment where an extension ofuseful battery life is desirable. The LP2950 is available in the threepin case 29 and DPAK packages, and the LP2951 is available in theeight pin dual in line, SOIC 8 and Micro8 surface mount A suffix devices feature an initial output Voltage tolerance Low Quiescent Bias Current of 75 mA Low Input to Output Voltage Differential of 50 mV at 100 mA and380 mV at 100 mA V, V or V Allows Use as a Regulator or Reference Extremely Tight Line and Load Regulation Requires Only a mF Output Capacitor for Stability Internal Current and Thermal Limiting NCV Prefix for Automotive and Other Applications RequiringUnique Site and Control Change Requirements; AEC Q100 Qualified and PPAP Capable These Devices are Pb Free and RoHS CompliantLP2951 Additional Features Error Output Signals an Out of Regulation Condition Output Programmable from V to 29 V Logic Level Shutdown Input(See Following Page for Device Information.)

3 TO 92 CASE 29 10 See detailed ordering and shipping information in the packagedimensions section on pages 14 and 15 of this data CONNECTIONSPin: 1. Output2. Ground3. InputDPAKCASE 369 CHeatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 3(Top View)Pin: 1. Input2. Ground3. Output818181 PIN CONNECTIONS18765234(Top View)OutputSenseShutdownInputFeedbackErr or OutputVO Ta pGNDSOIC 8 CASE 751 PDIP 8 CASE 626 Micro8 CASE 846A123412312 BENT LEADSTRAIGHT LEAD3 See general marking information in the device markingsection on page 16 of this data INFORMATIONDEVICE MARKING INFORMATIONLP2950, LP2951, INFORMATIONP ackageOutput VoltageOperating AmbientTemperature VAdjustableTO 92 Suffix ZLP2950CZ = 40 to +125 CDPAKS uffix DTLP2950 CDT = 40 to +125 CSOIC 8 NCV2951 ACD = 40 to +125 CSOIC 8 Suffix DLP2951CD = 40 to +125 CMicro8 Suffix DMLP2951 CDM = 40 to +125 CDIP 8 Suffix NLP2951CN = 40 to +125 CLP2950Cx xx / LP2951 Cxx xx1% Output Voltage Precision at TA = 25 CLP2950 ACx xx / LP2951 ACxx Output Voltage Precision at TA = 25 CFromCMOS/TTL3 Figure 1.

4 Representative Block DiagramsThis device contains 34 active orUnregulated V/100 VReferenceError Amplifier182 k60 mFGND4182 k60 mFLP2951CD or CNErrorAmplifierBattery orUnregulated DCShutdownErrorOutput5VO Ta V/100 mA330 kTo CMOS/TTL75 mV/60 mVError DetectionComparator50 k60 kLP2950, LP2951, RATINGS (TA = 25 C, unless otherwise noted.)RatingSymbolValueUnitInput VoltageVCC30 VdcPeak Transient Input Voltage (t < 300 ms)VCC32 Vdc Power Dissipation and Thermal Characteristics Maximum Power Dissipation PDInternally LimitedWCase 751(SOIC 8) D SuffixThermal Resistance, Junction to AmbientRqJA180 C/WThermal Resistance, Junction to CaseRqJC45 C/WCase 369A (DPAK) DT Suffix (Note 1)Thermal Resistance, Junction to AmbientRqJA92 C/WThermal Resistance, Junction to C/WCase 29 (TO 226AA/TO 92) Z SuffixThermal Resistance, Junction to AmbientRqJA160 C/WThermal Resistance, Junction to CaseRqJC83 C/WCase 626 N SuffixThermal Resistance, Junction to AmbientRqJA105 C/WCase 846A (Micro8)

5 DM SuffixThermal Resistance, Junction to AmbientRqJA240 C/WFeedback Input VoltageVfb to +30 VdcShutdown Input VoltageVsd to +30 VdcError Comparator Output VoltageVerr to +30 VdcOperating Ambient Temperature RangeTA 40 to +125 CMaximum Die Junction Temperature RangeTJ+150 CStorage Temperature RangeTstg 65 to +150 CStresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionalityshould not be assumed, damage may occur and reliability may be , LP2951, CHARACTERISTICS (Vin = VO + V, IO = 100 mA, CO = mF, TA = 25 C [Note 3], unless otherwise noted.)CharacteristicSymbolMinTypMaxUnit Output Voltage , V VersionsVOVVin = V, IO = 100 mA, TA = 25 CLP2950C * * = 40 to +125 CLP2950C * * = to 30 V, IO = 100 mA to 100 mA, TA = 40 to +125 CLP2950C * * Voltage , V VersionsVOVVin = V, IO = 100 mA, TA = 25 CLP2950C * = 40 to +125 CLP2950C * = to 30 V, IO = 100 mA to 100 mA, TA = 40 to +125 CLP2950C * Voltage , V VersionsVOVVin = V, IO = 100 mA, TA = 25 CLP2950C = 40 to +125 CLP2950C = to 30 V, IO = 100 mA to 100 mA, TA = 40 to +125 CLP2950C parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted.

6 Productperformance may not be indicated by the Electrical Characteristics if operated under different The Junction to Ambient Thermal Resistance is determined by PCB copper area per Figure This device series contains ESD protection and exceeds the following tests:Human Body Model (HBM), 2000 V, Class 2, JESD22 A114 CMachine Model (MM), 200 V, Class B, JESD22 A115 ACharged Device Model (CDM), 2000 V, Class IV, JESD22 C101 C3. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as VO(nom) is the part number Voltage Noise tests on the LP2951 are made with a mF capacitor connected across Pins 7 and Latch up Current Maximum Rating tested per JEDEC standard: JESD78 Inputs Low: passing positive current 100 mA and negative current 100 mA Inputs High: passing positive current 100 mA and negative current 10 mA.*NCV prefix is for automotive and other applications requiring site and change , LP2951, CHARACTERISTICS (continued)(Vin = VO + V, IO = 100 mA, CO = mF, TA = 25 C [Note 9], unless otherwise noted.)

7 CharacteristicSymbolMinTypMaxUnitLine Regulation (Vin = VO(nom) + V to 30 V) (Note 10)Regline%LP2950C XX/LP2951C/LP2951C XX/NCV2951C* XX/LP2951AC/LP2951AC XX/NCV2951AC* Regulation (IO = 100 mA to 100 mA)Regload%LP2950C XX/LP2951C/LP2951C XX/NCV2951C* XX/LP2951AC/LP2951AC XX/NCV2951AC* VoltageVI VOmVIO = 100 mA 3080IO = 100 mA 350450 Supply Bias CurrentICCIO = 100 mA 93120mAIO = 100 mA Supply Bias Current (Vin = VO(nom) V, IO = 100 mA) (Note 10)ICCdropout 110170mACurrent Limit (VO Shorted to Ground)ILimit 220300mAThermal RegulationRegthermal Noise Voltage (10 Hz to 100 kHz) (Note 11)VnmVrmsCL = mF 126 CL = 100 mF 56 LP2951A/LP2951AC OnlyReference Voltage (TA = 25 C)VrefVLP2951C/LP2951C XX/NCV2951C* XX/NCV2951AC* Voltage (TA = 40 to +125 C)VrefVLP2951C/LP2951C XX/NCV2951C* XX/NCV2951AC* Voltage (TA = 40 to +125 C)VrefVIO = 100 mA to 100 mA, Vin = 23 to 30 VLP2951C/LP2951C XX/NCV2951C* XX/NCV2951AC* Pin Bias CurrentIFB 1540nAError ComparatorOutput Leakage Current (VOH = 30 V)Ilkg Low Voltage (Vin = V, IOL = 400 mA)VOL 150250mVUpper Threshold Voltage (Vin = V)Vthu4045 mVLower Threshold Voltage (Vin = V)Vthl 6095mVHysteresis (Vin = V)Vhy 15 mVShutdown InputInput Logic VoltageVshtdnVLogic 0 ( Regulator On )0 1 ( Regulator Off ) 30 Shutdown Pin Input CurrentIshtdnmAVshtdn = V 3550 Vshtdn = 30 V 450600 Regulator Output Current in Shutdown ModeIoff (Vin = 30 V, Vshtdn = V, VO = 0, Pin 6 Connected to Pin 7)Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted.

8 Productperformance may not be indicated by the Electrical Characteristics if operated under different The Junction to Ambient Thermal Resistance is determined by PCB copper area per Figure ESD data available upon Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as VO(nom) is the part number Voltage Noise tests on the LP2951 are made with a mF capacitor connected across Pins 7 and 1.*NCV prefix is for automotive and other applications requiring site and change , LP2951, Voltage The input/output Voltage differentialat which the Regulator output no longer maintains regulationagainst further reductions in input Voltage . Measured whenthe output drops 100 mV below its nominal value (which ismeasured at V differential), Dropout Voltage is affectedby junction temperature, load current and minimum inputsupply Regulation The change in output Voltage for achange in input Voltage .

9 The measurement is made underconditions of low dissipation or by using pulse techniquessuch that average chip temperature is not Regulation The change in output Voltage for achange in load current at constant chip Power Dissipation The maximum totaldevice dissipation for which the Regulator will operatewithin Current Current which is used to operate theregulator chip and is not delivered to the Noise Voltage The RMS ac Voltage at theoutput, with constant load and no input ripple, measuredover a specified frequency Current Current drawn through a bipolartransistor collector base junction, under a specifiedcollector Voltage , when the transistor is off .Upper Threshold Voltage Voltage applied to thecomparator input terminal, below the reference voltagewhich is applied to the other comparator input terminal,which causes the comparator output to change state from alogic 0 to 1.

10 Lower Threshold Voltage Voltage applied to thecomparator input terminal, below the reference voltagewhich is applied to the other comparator input terminal,which causes the comparator output to change state from alogic 1 to 0 .Hysteresis The difference between Lower Thresholdvoltage and Upper Threshold CFigure 2. Quiescent Current, OUTPUT Voltage (V)Vout, OUTPUT Voltage (V)Vout- , AMBIENT TEMPERATURE ( C)Vin, INPUT Voltage (V) LP2950 /LP2951 BIAS CURRENT (mA)IL, LOAD CURRENT (mA)Figure 3. V Dropout Characteristics overLoadFigure 4. Output Voltage versus = 50 kWRL = 50 WLP2951 CTA = 25 CLP2951C200, OUTPUT Voltage (V) , INPUT Voltage (V)Figure 5. V Dropout Characteristics withRL = 50 C 40 CLP2951 CLP2950, LP2951, Voltage (mV)= 50T, TEMPERATURE ( C) , INPUT Voltage (V)t, TIME (ms)SHUTDOWN AND OUTPUT Voltage (V)t, TIME (ms), OUTPUT Voltage (V)Vin, INPUT Voltage (V) Dropout Voltage (mV)IO, OUTPUT CURRENT (mA) = 50 Vin DecreasingVin IncreasingVinVoutRL = 50 kTA = 25 CCL = mFIL = mAVO = VTA = 25 CIL = 10 mAVin = VVout = VCL = 10 mFShutdown Input350 RLDROPOUT Voltage (mV)= 50 Voltage CHANGE (mV) = mFTA = 25 CLP2951 CRL = 330 kTA = 25 C0250 BIAS CURRENT ( A) Vin, INPUT Voltage (V)Figure 6.