RY8017C 5.5V 1.2A 1.2MHz 同步力矩脉宽调制降压稳压器 SON763 深圳恒锐丰科技.pdf

RY8017C

5.5V1.2A1.2MHzSyncForce-PWMStep-DownRegulator

Features

•2.5Vto5.5VInputVoltageRange•HighEfficiency:Upto96%

•1AContinuousOutputCurrent•OutputAdjustablefrom0.6V

•1.2MHzSwitchingFrequency•NoSchottkyDiodeRequired

•Built-inShortProtectionwithFoldbackMode•LowDropoutOperation:100%DutyCycle

•Built-inOverCurrentLimit•OverTemperatureProtected

•Built-inOverVoltageProtection•LowQuiescentCurrent:40μA

•Force-PWMMode•AvailableinSON763package

•InternalSoft-Start•-40°Cto+85°CTemperatureRange

Applications

•CellularandSmartPhones•PortableInstruments

•WirelessandDSLModems•DigitalStillandVideoCameras

•PDAs•PCCards

GeneralDescription

TheRY8017Cisahigh-efficiencymonolithicsynchronousbuckregulatorusingaconstantfrequency,currentmode

architecture.Thedeviceisavailableinanadjustableversion.Supplycurrentwithnoloadis40uAanddropsto

1uAinshutdown.The2.5Vto5.5VinputvoltagerangemakestheRY8017CideallysuitedforsingleLi-Ion

batterypoweredapplications.100%dutycycleprovideslowdropoutoperation,extendingbatterylifeinportable

systems.PWM/PFMmodeoperationprovidesverylowoutputripplevoltagefornoisesensitiveapplications.

Switchingfrequencyisinternallysetat1.2MHz,allowingtheuseofsmallsurfacemountinductorsandcapacitors.

Lowoutputvoltagesareeasilysupportedwiththe0.6Vfeedbackreferencevoltage