STI8035-DS-EN.pdf

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1、STISTI 80358035650mA650mA LNB-PowerLNB-Power SupplySupply& & ControlControl VoltageVoltage RegulatorRegulatorFEATURESFEATURESGENERALGENERAL DESCRIPTIONDESCRIPTIONI ntended for analog and digital satellitereceivers/sat-TV,sat-OC cards, theSTI8035 is a monolithic voltage regulatorand interface IC, pac

2、kaged in eSOP8EL ,specifically designed to provide the 14/19Vpower supply with high fficiency and the22kHz EXTM signaling to the LNBdown-converter in the antenna dish or tothe multi-switch box.STI8035 consists of a BOOST converterand a low-noise inear regulator along withthe circuitry required for E

3、XTMinjectionand pin controllable interface.The devicemakes the total LNB supply design simple,efficient and compactwith low externalcomponent countThe external modulation input (EXTMpin)can accept a tome modulated DiSEqCcommand and transfer it symmetrically tothe output to meet DiSEqC 1.x protocolLo

4、w noise output to avoid sensitivity ofCan Tuner and DISHs LNA droppingdownNoise +/-80mV350MHz BWL，Noise +/-50mV20MHz BWLSingle chip solution on 700mVpp22KHzEXTM with 10 s Trise/Tfallfor less Transferring noiseLNB Voltages (2levels: 14V and19V) compatible with commonstandards, Push-pull output stagem

5、inimizes 14 19V and 19V 14Voutput transition times;External 22KHz EXTM input;Integrated DC/DC BOOST converterand high efficiency (typ.90%) withintegrated Power Mos-FET1.0MHz Switch Frequency BOOSTIntegrated low Noise Linear Regulator5.0V,3.3V,2.5V,1.8V ,1.2and1.05VlogiccompatibleInternal Short, OCP,

6、OTP, protectioneSOP8L package、eTSSOP14LpackageAPPLICATIONSAPPLICATIONSEFFICIENCYEFFICIENCYLNBPowersupply ForDVB-S/S2/ABSDigital STBSatellite TV cardsHANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 1STISTI 80358035TYPICALTYPICAL APPLICATIONAPPLICATIONPINPIN DESCRIPTIONDESCRIPTION(ESOP8)(ES

7、OP8)NAMENAMEVINVOUTBOOSTVCPLXENH_LEXTMGNDPINPIN123456789Power Supply inputOutput voltage for the LNBDESCRIPTIONDESCRIPTIONBOOST converter output voltage sense, and internal LDOs inputterminalCharge Pump for LDO supplyDC-DC converter switch node connection, connects to inductorWhen this pin is low, t

8、he output is disabled. Setting EN = 1 enables theoutput voltageOutput Voltage set input pin, high:19V, Low:14V22KHz EXTM signal input pinPower Ground (Exposed pad)2014.6Page 2HANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DSSTISTI 80358035ELECTRICALELECTRICAL SPECFICATIONSPECFICATION1 1、ABSOLUTEABSOL

9、UTE MAXIMUMMAXIMUM RATINGSRATINGS (Note(Note 1)1)ITEMSITEMSNAMENAMEVIN，ENBOOSTVOUT(10ns)LX(10ns)VCPH L,TON INJunction TemperatureStorage TemperatureVALUEVALUE-0.340-0.327-227-240-0.330-0.35.5-40150-50150UNITUNITVVVVVVVoltage RangeTjTstg2 2、DISSIPATIONDISSIPATION RATINGSRATINGS(2oz.(2oz. tracetrace a

10、ndand coppercopper pad)pad)PACKAGEPACKAGEJAJAeSOP8L60JCJC40UNITUNIT/W3 3、 RECOMMENDEDRECOMMENDED OPERATINGOPERATING CONDITIONSCONDITIONSOverOver operatingoperating free-airfree-air temperaturetemperature rangerange (unless(unless otherwiseotherwise noted)noted)ITEMSITEMSNAMENAMEMINMINMAXMAXVIN，EN914

11、BOOST，VOUT-0.123Voltage RangeLX-0.130H_L,EXTM_IN-0.15Ground(Exposed Pad)-0.10.1TAOperating free-air temperature-40+85TJOperating junction temperature-40+1254 4、ELECTRICALELECTRICAL CHARACTERISTICSCHARACTERISTICSOverOver operatingoperating free-airfree-air temperaturetemperature range(unlessrange(unl

12、ess otherwiseotherwise noted)noted)VIN=12VVIN=12V，TA=25TA=25PARAMETERPARAMETERSupply VoltageOperatingsupplyvoltage rangeInputUnderVoltageLockout ThresholdInputUnderVoltageLockout ThresholdHysteresisOperatingsupplycurrentSymbolSymbolCONDITIONSCONDITIONSMINMINTYPTYPUNITUNITVVVVVMAXMAXUNITUNITVINVUVLOV

13、UVLO_HYIINEN=”1”,VOUT=19V,EXTM_IN=0VVin rising912814VV0.3V8mAHANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 3STISTI 80358035EN=”1”,VOUT=19V,22KHz EXTM Input241.618.513.619140.944019.914.4mAmAVVVmVDisable Supply CurrentOutput VoltageOutput VoltageLinear Regulator DropVoltageVIN Line Regul

14、ationVOUT output loadregulationRippleandnoiseonVOUT outputOutput Current limitBOOST DC/DCBostDC/DCSwitching FrequencySwitch On ResistanceBOOST Maximum DutyBOOST Minimum OntimeBOOST Current LimitISDNEN=”0”EN=”1”, H_L=”1”EN=”1”, H_L=”0”EN=”1”,ILOAD=450mAVIN=914V,VOUT=19VIload=0450mA,VOUT=19VSlow Rate=

15、255mA/us,CLOAD=0.2uF20MHz BWL350MHz BWLVOUT=19V orVOUT=14VVOUT output shortVOUTVDROPRLINERLOAD30mVVNOISE5080900180mVmVmAmAILIMITFBOOSTRsonDBST_MAXDBST_MINIBST_LIMEN=”1”ILOAD=450mA0.811208002.21.2MHzm%AShort and Overload ProtectionDynamic Overload ONTontimeDynamic Overload OFFTofftimeThermal Shutdown

16、TSDNThresholdTSDN_HThermal ShutdownYHysteresisEXTMInput EXTM FrequencyFEXTMRangeVOUTOutputEXTMVPP_EXAmplitude, peak to peakTMOutput shorted toGNDOutput shorted toGND65180016025mSmS20ILOAD=0450mA,CLOAD=100nF60022660720KHzmVHANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 4STISTI 80358035VOU

17、T output EXTMDutyVOUT output EXTMRising TimeVOUT output EXTMRising TimeEXTM High Logic InputEXTM Low Logic InputEXTMPinLeakageCurrentH_LInputDEXTMTRISE_TONTFALL_TONVTON_INHVTON_INLITON_LEAKPull down 2M RES-3ILOAD=0450mA,CLOAD=570nFILOAD=0450mA,CLOAD=570nFILOAD=0450mA,CLOAD=570nF7.57.50.950.555010101

18、2.512.5%uSuSVV3uAH_L High Logic InputH_L Low Logic InputH_L PinInputLeakageENEN High Logic InputEN Low Logic InputENPINInputCurrentMaximumVHL_INHVHL_INLIHL_LEAKVEN_INHVEN_INLIEN_MAXInput=1.2VPull down2M RES0.950.55-33VVuA0.950.55VV10uAHANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 5STIST

19、I 803580355 5、INTERNALINTERNAL BLOCKBLOCK DIAGRAMDIAGRAM6 6、FUNCTIONFUNCTION DESCRIPTIONDESCRIPTIONThe STI8035 single output LNB supply utilizes built-in DC/DC step-up converters, whichoperate from 9V to 14V and outputs the low noise voltage set by H-L pin, andacceptsa tome modulated DiSEqC command

20、and transfers it symmetrically to the output tomeet DiSEqC 1.x protocol.DiSEqCDiSEqC EncodingEncodingThe EXTM accepts an externally modulated EXTM command and in turn modulatesthe VOUT symmetrically to meet the DiSEqC 1.x and with few more externalcomponents to meet DiSEqC 2.0 transmit protocol. Bur

21、st coding of the EXTM can beaccomplished due to the fast response of the EXTM pin.LinearLinear RegulatorRegulatorThe output linear regulator is designed to source 500mA continuous current and 650mApeak.In order to minimize the power dissipation, the output voltage of theinternalstep-up converter is

22、adjusted to allow the linear regulator to work at a minimumdropout of 1 V typical (Load current =500mA) between the BOOST and VOUT pin. TheBOOST pin is capable of withstanding a back voltage of 27V.HANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 6STISTI 80358035ShortShort andand OverOver

23、LoadLoad ProtectionProtectionWhen the LDO current exceeds the preset overcurrent threshold for a period of65ms,the device enters a TON = 65ms/TOFF = 500ms routine. The device returns to normaloperation after a successful soft-start cycleThis IC is protected against overheating. When the junction tem

24、perature exceeds+160C (typical), the step-up converter and the linear regulator are shut-off. Whenjunction is cooled down to +135C (typical), normal operation is resumed.EXTMEXTM inputinputOnce EN is pulled high, after a 50ms delay before applying 22kHz, 50% square pulse onEXTM in generates the DISE

25、Q EXTM (+/-350mV) on the output VOUT.theHANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 7STISTI 80358035PACKAGEPACKAGE INFORMATIONINFORMATIONESOP8ESOP8Notes:Notes:All dimensions are in millimeters.All dimensions dont include mold flash & metal burr.HANGZHOU SUNTO SEMICONDUCTOR CO., LTD .STI8035DS2014.6Page 8