DC/DC芯片版图分层次拍照，金属、poly，等等，很详细，没见过的同学可以下载看看TI的降压dcdc，比较老的一款芯片，图片不是很清楚，做这方面的下下来看看无妨！TPS62040FEATURESUp to 95% Conversion EfficiencyTypical Quiescent Current: 18 μALoad Current: 1.2 AOperating Input Voltage Range: 2.5 V to 6.0 VSwitching Frequency: 1.25 MHzAdjustable and Fixed Output VoltagePower Save Mode Operation at Light load Currents100% Duty Cycle for Lowest DropoutInternal SoftstartDynamic Output Voltage PositioningThermal ShutdownShort-Circuit Protection10 Pin MSOP PowerPad Package10 Pin QFN 3 X 3 mm PackageAPPLICATIONSPDA, Pocket PC and Smart PhonesUSB Powered ModemsCPUs and DSPsPC Cards and NotebooksxDSL ApplicationsStandard 5-V to 3.3-V ConversionDESCRIPTIONThe TPS6204x family of devices are high efficiencysynchronous step-down dc-dc converters optimized forbattery powered portable applications. The devices areideal for portable applications powered by a single Li-Ionbattery cell or by 3-cell NiMH/NiCd batteries. With anoutput voltage range from 6.0 V down to 0.7 V, the devicessupport low voltage DSPs and processors in PDAs,pocket PCs, as well as notebooks and subnotebookcomputers. The TPS6204x operates at a fixed switchingfrequency of 1.25 MHz and enters the power save modeoperation at light load currents to maintain high efficiencyover the entire load current range. For low noiseapplications, the devices can be forced into fixedfrequency PWM mode by pulling the MODE pin high. TheTPS6204x supports up to 1.2-A load current.TI的降压dcdc，比较老的一款芯片，图片不是很清楚，做这方面的下下来看看无妨！TPS62040FEATURESUp to 95% Conversion EfficiencyTypical Quiescent Current: 18 μALoad Current: 1.2 AOperating Input Voltage Range: 2.5 V to 6.0 VSwitching Frequency: 1.25 MHzAdjustable and Fixed Output VoltagePower Save Mode Operation at Light load Currents100% Duty Cycle for Lowest DropoutInternal SoftstartDynamic Output Voltage PositioningThermal ShutdownShort-Circuit Protection10 Pin MSOP PowerPad Package10 Pin QFN 3 X 3 mm PackageAPPLICATIONSPDA, Pocket PC and Smart PhonesUSB Powered ModemsCPUs and DSPsPC Cards and NotebooksxDSL ApplicationsStandard 5-V to 3.3-V ConversionDESCRIPTIONThe TPS6204x family of devices are high efficiencysynchronous step-down dc-dc converters optimized forbattery powered portable applications. The devices areideal for portable applications powered by a single Li-Ionbattery cell or by 3-cell NiMH/NiCd batteries. With anoutput voltage range from 6.0 V down to 0.7 V, the devicessupport low voltage DSPs and processors in PDAs,pocket PCs, as well as notebooks and subnotebookcomputers. The TPS6204x operates at a fixed switchingfrequency of 1.25 MHz and enters the power save modeoperation at light load currents to maintain high efficiencyover the entire load current range. For low noiseapplications, the devices can be forced into fixedfrequency PWM mode by pulling the MODE pin high. TheTPS6204x supports up to 1.2-A load current……