Low-Battery Indicator Is Low Cost, Highly Efficient, and Environmentally Friendl

Abstract:Thisapplicationnotepresentsacircuitthatusesalow-powerCMOScomparatortoprovideanLEDvisualindicationofalow-batterycondition.ThisLBO(low-battery-indicator)isachievedbypulsingtheLEDatalowfrequencyandlowdutycycle.Thecircuitaccomplishesthiswithoutdrainingexcessivebatterycurrentthatcanleadtopermanentbatterydamageand,ultimately,hazardouswastedisposal.Thiscircuitalsohelpsconservebatterycurrentintheoffcyclebyplacingthecomparatorinshutdown.Equationsandcircuitanalysisareincludedfordeterminingdutycycleandcomparatortrippoints.Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Automotive>APP1872Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>BatteryManagement>APP1872Keywords:comparator,lowbattery,LED,lowcost,lowpowerconsumption,comparatorsFeb03,2003APPLICATIONNOTE1872Low-BatteryIndicatorIsLowCost,HighlyEfficient,andEnvironmentallyFriendlyFeb03,2003Abstract:Thisapplicationnotepresentsacircuitthatusesalow-powerCMOScomparatortoprovideanLEDvisualindicationofalow-batterycondition.ThisLBO(low