原标题：Linear LTM4647 30A降压DC-DC电源模块(μModule)解决方案

　　Linear公司的LTM4647是完整的30A降压DC/DC电源模块(μModule)稳压器,集成了开关控制器,功率FET,电感和支持元件.输入电压4.7V-15V,输出电压0.6V-1.8V由单个外接电阻设定.效率高达87%,主要用在通信,网络和工业设备,点负载稳压器.本文介绍了LTM4647主要特性,框图和多种应用电路,以及演示板DC2141A主要特性,测量图,电路图和材料清单.

　　The LTMR4647 is a complete 30A output switching modestep-down DC/DC μModuleR (power module) regulator.Included in the package are the switching controller, powerFETs, inductor and all supporting components. Operatingover an input voltage range of 4.7V to 15V, the LTM4647supports an output voltage range of 0.6V to 1.8V, set bya single external resistor. Only a few input and outputcapacitors are needed.

　　Its high efficiency design delivers 87% efficiency from 12Vinput to 1.0V output with 30A continuous load current.High switching frequency and a current mode architectureenable a very fast transient response to line and loadchanges without sacrificing stability. The device supportsfrequency synchronization, programmable multiphaseoperation, N+1 phase redundancy, and output voltagetracking for supply rail sequencing.

　　Fault protection features include overvoltage and overcurrentprotection. The power module is offered in a spacesaving 9mm × 15mm × 5.01mm BGA package. TheLTM4647 is available with SnPb (BGA) or RoHS compliantterminal finish.

　　LTM4647主要特性:

　　n4.7V to 15V Input Voltage Range

　　n0.6V to 1.8V Output Voltage Range

　　n30A DC Output Current

　　n±1.2% Total DC Output Voltage Error (–40°C to 125°C)

　　nHigh Reliability N + 1 Phase Redundancy Supported

　　nInternal or External Control Loop Compensation

　　nDifferential Remote Sense Amplifier for PrecisionRegulation

　　nCurrent Mode Control/Fast Transient Response

　　nMultiphase Current Sharing Up to 180A

　　nBuilt-In Temperature Monitoring

　　nSelectable Pulse-Skipping, Burst ModeR Operation

　　nSoft-Start/Voltage Tracking

　　nFrequency Synchronization

　　nOutput Overvoltage Protection

　　nOutput Overcurrent Foldback Protection

　　n9mm × 15mm × 5.01mm BGA Package

　　LTM4647应用:

　　nTelecom, Networking and Industrial Equipment

　　nPoint-of-Load Regulation

　　图1.LTM4647简化框图

　　图2.LTM4647应用电路:输入6V-15V,输出1.0V/30A

　　图3.LTM4647应用电路:输入4.7V-5.5V,输出1.2V/30A

　　图4.LTM4647应用电路:输入6V-15V,输出1.0V/60A

　　图5.LTM4647应用电路:输入6V-15V,跟踪输出1.0V和1.2V

　　图6.LTM4647应用电路:3相90A,1相30A冗余

　　图7.LTM4647应用电路:4相1V 120A

　　演示板DC2141A

　　Demonstration circuit 2141A features the LTM®4647EY,a 30A high efficiency, switch mode step-down powerμModule regulator. The input voltage range is from 6V to15V. To use DC2141A for input voltage range from 4.7V to6V, connect INTVCC to SVIN (change R22 from OPT to 0Ω),DRVCC to VIN (change R21 from 0Ω to OPT, R28 from OPTto 0Ω). The output voltage range is 0.6V to 1.8V. Deratingis necessary for certain VIN, VOUT, frequency and thermalconditions. The DC2141A offers the TRK/SS pin allowingthe user to program output tracking or soft-start period. Theboard operates in continuous conduction mode in heavyload conditions. For high efficiency at low load currents,the MODE_PLLIN jumper selects pulse-skipping mode fornoise sensitive applications or Burst Mode® operation inless noise sensitive applications. The MODE_PLLIN pinalso allows the LTM4647 to synchronize to an externalclock signal (between 400kHz and 800kHz). DC2141Ahas the option of choosing both internal and externalcompensation circuit for LTM4647. Tying the PHASMDpin to different voltage generates certain phase differencebetween MODE_PLLIN and CLKOUT. The LTM4647 datasheet must be read in conjunction with this demo manualprior to working on or modifying demo circuit DC2141A.

　　图8.演示板DC2141A外形图

　　演示板DC2141A材料清单: