HT7660HT7660--CMOSSwitched-CapacitorVoltageConverterGeneralDescriptionHT7660isamonolithicCMOSswitched-capacitorvoltageconverter.HT7660isdesignedtocompleteavoltageconversionfrompositivetonegative.Theonlyrequiredexternalcomponentsaretwolowcostelectrolyticcapacitors.HT7660includesavoltageregulator,anRCoscillatorandfouroutputpowerMOSswitches.ThefrequencyofanRCoscillatorcanbeloweredbyaddinganexternalcapacitorbetweenVDDandtheOSCpin,oranexternalclockcanbeconnectedtotheOSCpintoreplacetheoriginaloscillator.TheLVterminalmaybetiedtoVSStodisablethevoltageregulator.Bydoingthis,lowvoltageoperationcanbeimproved.FeaturesSimpleconversionofVDDto-VDDCascadeconnection(twodevicesareconnected,VOUT=-2VDD)BoostpinforhigherswitchingfrequencyEasytouse-RequiresonlytwoexternalcapacitorsNoexternaldioderequiredTypicallywithnoloadvoltageconversion,99.9%efficiencyTypicalpowerefficiencyis98%Wideoperatingvoltagerange:3Vto12V8-pinDIP/SOPpackage)