LMV431xLow-Voltage(1.24-V)AdjustablePrecisionShuntRegulators

1 Features3 DescriptionThe LMV431,LMV431Aand LMV431Bare precision1• Low-VoltageOperation/WideAdjustRange1.24V shuntregulatorscapableof adjustmentto 30(1.24V/30V)V. Negativefeedbackfromthe cathodeto the adjust• 0.5%InitialTolerance(LMV431B)pin controlsthe cathodevoltage,muchlike a non-• TemperatureCompensatedfor Industrialinvertingop ampconfiguration(RefertoSymbolandFunctionalDiagrams). A two-resistorvoltagedividerTemperatureRange(39 PPM/°C for theterminatedat the adjustpin controlsthe gainof aLMV431AI)1.24V band-gapreference.Shortingthe cathodeto• Low OperationCurrent(55 μA)the adjustpin (voltagefollower)providesa cathode• Low OutputImpedance(0.25Ω)voltageof a 1.24V.• FastTurn-OnResponseTheLMV431,LMV431AandLMV431Bhave• Low Costrespectiveinitialtolerancesof 1.5%,1%, and 0.5%,andfunctionallylendthemselvesto several2 Applicationsapplicationsthatrequirezenerdiodetypeperformanceat low voltages.Applicationsincludea 3• ShuntRegulatorV to 2.7 V low drop-outregulator,an erroramplifierin• SeriesRegulatora 3 V off-lineswitchingregulatorandevenas a• CurrentSourceor Sinkvoltagedetector.Thesepartsare typicallystablewithcapacitiveloadsgreaterthan10 nF and less than50• VoltageMonitorpF.• ErrorAmplifierTheLMV431,LMV431AandLMV431Bprovide• 3-V Off-LineSwitchingRegulatorperformanceat a competitiveprice.