1、Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 SeriesSynchronous Step-Up DC/DCConverter with PFM ControlCE8401 Series INTRODUCTIONThe CE8401 Series is a Synchronous step-up DC/DC Converter with PFM Control.With the CE8401 Series, a step-up switching DC/DC converter can be configured by u

2、sing an external coil, capacitor. The built-in MOSFET is turned off by a protection circuit when the voltage at the LX pin exceeds the limit to prevent it from being damaged. FEATURESz External parts: Coil, capacitorz Output voltage: Settable to between 2.1V to 5.5 V in 0.1 V stepsz Maximum Oscillat

3、ion frequency:300KHzz Accuracy of 2%z High efficiency：95% APPLICATIONSzDigital cameraszCameras, video equipment,z Electronic notebooks and PDAszCommunications equipmentzPortable CD/MD playersz Power supply for microcomputers BLOCK DIAGRAM ORDER INFORMATIONCE8401DESIGNATORSYMBOLDESCRIPTIONAStandard L

4、XBWith shutdown, LXOutput VoltageInteger（2.15.5）e.g.：3.0V=:3; :0MPackage：SOT-23-3/5MBPackage：SOT-23PPackage：SOT-89TPackage：TO92V1.21(10)Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 Series PIN CONFIGURATIONTable 1CE8401A Series（SOT-23-3/SOT-23 PKG）PIN NO.PIN NAMEFUNCTION1VOUTOutput volt

5、age pin2VSSGND pin3LXExternal inductor connection pinTable 2 CE8401B Series（SOT-23-5 PKG）PIN NO.PIN NAMEFUNCTIONShutdown pin1EN“H”: Normal operation“L”: Step-up stopped2VOUTOutput voltage pin3NC(N.C.)4VSSGND pin5LXExternal inductor connection pinTable 3CE8401A Series （SOT-89-3 PKG）PIN NO.PIN NAMEFUN

6、CTION1VSSGND pin2VOUTOutput voltage pin3LXExternal inductor connection pinTable 4CE8401A Series （TO-92 PKG）PIN NO.PIN NAMEFUNCTION1VSSGND pin2VOUTOutput voltage pin3LXExternal inductor connection pinV1.22(10)Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 Series ABSOLUTE MAXIMUM RATINGS(U

7、nless otherwise specified, Ta=25C)PARAMETERSYMBOLRATINGSUNITSVOUT Pin VoltageVOUTVSS-0.3 VSS+8VENPin VoltageENVSS-0.3 VSS+8VLXPin VoltageVLXVSS-0.3 VSS+8VLXPin CurrentILX1000mASOT-23250mWPowerSOT23-3/SOT-23-5PD250mWDissipationSOT-89-3500mWTO-92500mWOperating TemperatureTopr-40 +85CStorage Temperatur

8、eTstg-40 +125CSoldering Temperature & TimeTsolder260C, 10s ELECTRICAL CHARACTERISTICS(Unless otherwise specified, Ta=25C)PARAMETERSYNBOLCONDITIONSMINTYPMAXUNITSOutput VoltageVOUTVOUT(S)VOUTVOUT(S)V0.981.02Input VoltageVIN5VOperation Start VoltageVST1IOUT= 1 mA0.9VInput Current At No LoadISSVIN=1.8V,

9、VOUT=3.0V15-ACurrent Consumption 2ISS2VOUT=VOUT0.5 V610ACurrent ConsumptionISSSVEN = 0 V1.0ADuring ShutdownMaximum OscillationfOSCVOUT= 0.95VOUT， measure300KHzFrequencywaveform at LX pinVOUT= 0.95VOUT，Duty Ratio 1Duty1measure waveform at707885%LX pinEfficiencyEFFI90%VSHVOUT=0.95VOUT， judge0.75VShutd

10、own Pin Inputoscillation at LX pinVoltageVSL1VOUT= 0.95VOUT，0.3Vjudge stop at LX pinShutdown Pin InputISHVEN6V-0.10.1ACurrentISLVEN0V-0.10.1ARemark：VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output voltage.V1.23(10)Synchronous Step-Up DC/DC C

11、onverter with PFM ControlCE8401 Series STANDARD CIRCUITSComponent:Inductor：47uH(Sumida)Capacitor：47uF/16V(Tantalum)1、 CE8401A：2、CE8401B：V1.24(10)Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 Series TYPICAL PERFORMANCE CHARACTERISTICSCin=Cout=100uFL=47uHV1.25(10)Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 Series PACKAGE INFORMATION SOT-23V1.26(10)Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 Series SOT-23-3V1.27(10)Synchronous Step-Up DC/DC Converter with PFM ControlCE8401 Serie