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XC9235 Dataheets PDF



Part Number XC9235
Manufacturers Torex Semiconductor
Logo Torex Semiconductor
Description Synchronous Step-Down DC/DC Converter
Datasheet XC9235 DatasheetXC9235 Datasheet (PDF)

XC9235/XC9236/XC9237 Series ETR05014-017a 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters ■GENERAL DESCRIPTION ☆Green Operation Compatible The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC ☆coGnvreeertneOrspweritahtiaonbuCilot-minp0a.4tib2Ωle Pchannel MOS driver transistor and 0.52Ω N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V (A~C types), 1.8V to 6.0V (D~G.

  XC9235   XC9235


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XC9235/XC9236/XC9237 Series ETR05014-017a 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters ■GENERAL DESCRIPTION ☆Green Operation Compatible The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC ☆coGnvreeertneOrspweritahtiaonbuCilot-minp0a.4tib2Ωle Pchannel MOS driver transistor and 0.52Ω N-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V (A~C types), 1.8V to 6.0V (D~G types). For the D/F types which have a reference voltage of 0.8V (accuracy:±2.0%), the output voltage can be set from 0.9V by using two external resistors. The A/B/C/E/G types have a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy:±2.0%). The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. The B/F/G types have a high speed soft-start as fast as 0.25ms in typical for quick turnon. With the built-in UVLO function, the internal P-channel MOS driver transistor is forced OFF when input voltage becomes 1.4V or lower. The B to G types integrate CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function. Four types of package SOT-25, USP-6C, USP-6EL and WLP-5-03 are available. ■APPLICATIONS ●Smart phones / Mobile phones ●Bluetooth ●Mobile devices / terminals ●Portable game consoles ●Digital still cameras / Camcorders ●Note PCs / Tablet PCs ■APPLICATIONS ●Mobile phones, Smart phones ●■BluTeYtoPotIhChAeaLdAsePtsPLICATION CIRCUIT ●Mobile WiMAX PDAs, MIDs, UMPCs ●●●●6600VV● A●00OOmm●   ●  UUDMN/PBAATTXXooi/XAXACCPgCrC,C,t993it/e9B9BtE22aab2,2,33/PbGl3C3Co55llc5,5,//eaotXX/E/EaykyCCpg9,9,mee2G2G99cars3シ 3シ22eoms6633r(m,O66aリ リ//eLLP//99supXXー ー 22ct,ouCCp33oCrut99ズ ズ 77tent22aarsV33((bmsoo77 lleltcea ogMsLrex deFed ixriesa dP)V lINa ye))rs A/B/C/E/G types (Output VoltagLex Fixed)VIN VSS VSS VSS VSS CL (cerCaLmic) (ceramic) VOUT VOUT CE/ CMEO/DE MODE VIN VIN CIN (ceCraINmic) (ceramic) CE/MODE CE/MODE ■FEATURES Driver Transistor Built-In : 0.42Ω P-ch driver transistor Input Voltage 0.52Ω N-ch switch transistor : 2.0V ~ 6.0V (A/B/C types) 1.8V ~ 6.0V (D/E/F/G types) Output Voltage : 0.8V ~ 4.0V (Internally set) 0.9V ~ 6.0V (Externally set) High Efficiency Output Current Oscillation Frequency : 92% (TYP.)* : 600mA : 1.2MHz, 3.0MHz (+15%) Maximum Duty Cycle : 100% Control Methods Function : PWM (XC9235) PWM/PFM Auto (XC9236) PWM/PFM Manual (XC9237) : Current Limiter Circuit Built-In (Constant Current & Latching) Capacitor Operating Ambient Temperature CL Discharge (B/C/D/E/F/G types) High Speed Soft Start (B/F/G type) : Low ESR Ceramic Capacitor :-40℃ ~ 85℃ Packages : SOT-25 (A/B/C types only) USP-6C USP-6EL (A/B/C/G types only) Environmentally Friendly WLP-5-03 (A/B types only) : EU RoHS Compliant, Pb Free * Performance depends on external components and wiring on the PCB. ● D●  ●  /FXCXDXDtyC,C,9p9F9F2e2シ2シ3s3355リ5リ(/OX//Cu9ー9ーt229p3ズ23ズu636t6/(/(V/99oX22lCt 33a977g2e3E7xternally Set) )) VOUT 6V0O0mUTA 600mA L L Lx VIN Lx VIN CL (cerCaLmic) (ceramic) RFB1 CFB RFB1 CFB VSS VSS VSS VSS FB FB CE/ MCEO/DE MODE RFB2 RFB2 ■TYPICAL PERFORMInpAut VNoltCageE: VINC(VH) ARACTERISTICS ●Efficiency vs. Output Current (fOSC=1.2MHz, VOUT=1.8V) 100 PWM/PFM Automatic Sw itching Control EfficieEffniccye:ncEyF:FEIF(FI(%)%) ■TYPICAL 98P00 ERFORMANCE CHARACTERISTICS VIN VIN ●Efficiency vs. 70 Ou6t0put VIN= 4.2V Cu3.r6rVent(fOSC=1.2MHz,PWVMOCUoTn=tro1l .8V) CIN (ceCraINmic) 50 2.4V VIN= 4.2V 3.6V (ceramic) 40 2.4V CE/MODE 30 CE/MODE 20 10 0 0.1 1 10 100 1000 Output Current:IOUT(mA) 1/33 XC9235/XC9236/XC9237 Series ■BLOCK DIAGRAM ●XC9235 / XC9236 / XC9237 A Series ●XC9235 / XC9236 /PhXaseC9237 Compensation AVOSUeTries CFB R2 Error Amp. PWM Comparator FB R1 .


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