适用于12V电源系统的具有电荷汇聚相降低电感电流的高密度混合降压转换器.pdf

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1、A High-Density Hybrid Buck Converter with a Charge Converging Phase Reducing Inductor Current for 12V Power Supply SystemsYichao Ji,Ji Jin,Lin ChengUniversity of Science and Technology of China,Hefei,ChinaMotivationCPU/GPUPoint of load1VMemory1.8V12VMotherboard12V-to-1V ConverterInput/Flying Capacit

2、or.DDR5.Requirements:High voltage conversion ratio High efficiency High current density 12V system is widely used in industrial and automotive applications Inductors occupy the most area,leading to low current densityImages from InternetPortable DevicesAutomotive ElectronicsData CenterIndustrial Aut

3、omation12V RailConventional Buck ConverterVINLCOIOVOS1S2DCR:VIN High-voltage device(high FoM)and high power loss High inductor current and large DCR conduction loss0481216202424681012FoM(mnC)Drain-Source Voltage(V)FoM=RONQG1.8V5V9V12V6V0.18m BCD processVOVINLCF+QL2VINLCFQC+Phase 1Phase 2QC=QL1QL1VOQ

4、L=QL1+QL2=ILTVOVINQC=ILDT or IL(1 D)TQO=IOTLCFEquivalent Charge Breakdown in One T C-Path L-Path QO1QO2Dual-Path Buck ConvertersILIO=QLQO=QLQL+QC=11+Dor12D00.20.40.60.810.20.40.60.81.0D or(1-D)0.30.50.70.9ILIO 1CF QCdependent on D and modest ILreduction Phase 1:CFalong with VOis soft charged by L wi

5、th a QCof ILDT or IL(1D)T Phase 2:QCis transferred to the output in parallel with L realizing ILreductionDual-Path Buck ConvertersILIO=QLQL+QC1+QC2=11+2Dor132Dor1200.20.40.60.810.20.40.60.81.0D or(1-D)0.30.50.70.9ILIO 1CF 2CF_2 2CF_1VOVINPhase 1LCF1CF2+QC2QC1=QL1QL1VOVINLCF2CF1+QC1QC2=QL2QL2QC1=ILDT

6、,QC2=IL(1 D)TPhase 2VOVINPhase 1LCF1CF2+QC2QC1=QL1QL1VOVINPhase 2LCF2+QC2=QC1QL2QC1=QC2=ILDTCF1orG.Cai,ISSCC22J.Ko,VLSI21QL=ILTVOVINQCi=ILDT or IL(1 D)TQO=IOTLCF1CF2(i=1,2)QC1QC2C-Path L-Path Equivalent Charge Breakdown in One T Case 1Case 2 By applying 2 CFs,ILis further reduced.Each QCis dependent