原标题：TI TPS544x25PMBus 1.2兼容20A/30A电源转换方案

　　TI公司的TPS544x25系列是PMBus 1.2兼容的非隔离的DC/DC转换器,集成了高频率工作的FET,输出电流20A或30A,输入电压4.5V-18V,输出电压0.5V-5.5V,主要用在测量和仪表,以太网交换,光交换,路由器,基站和服务器,企业存储SSD和高效率电源解决方案.本文介绍了TPS544x25系列产品主要特性,功能框图,典型应用电路,以及评估模块PWR681EVM主要特性,电路图,材料清单和PCB设计文件.

　　The TPS544x25 devices are PMBus 1.2 Compliant, non-isolated DC-DC converters with integrated FETs, capable of high-frequency operation and 20-A or 30-A current output from a 5 mm × 7 mm package. High-frequency, low-loss switching, provided by an integrated NexFET power stage and optimized drivers, allows for very high-density power solutions. The PMBus interface enables the AVS through VOUT_COMMAND, flexible converter configuration, as well as key parameters monitoring including output voltage, current and an optional external temperature. Response to fault conditions can be set to either restart, latch-off or ignore depending on system requirements.

　　TPS544x25主要特性:

　　PMBus 1.2 Compliant Converters: 20 A and 30 A

　　Input Voltage Range: 4.5 V to 18 V

　　Output Voltage Range: 0.5 V to 5.5 V

　　5 mm×7 mm LQFN Package

　　Single Thermal Pad

　　Integrated 5.5-mΩ and 2.0-mΩ Stacked NexFET Power Stage

　　500-mV to 1500-mV Reference for Adapative Voltage Scaling (AVS) and Margining through PMBus

　　0.5% Reference Accuracy at 600 mV and Above

　　Lossless Low-Side MOSFET Current Sensing

　　Voltage Mode Control with Input Feed-Forward

　　Differential Remote Sensing

　　Monotonic Start-Up into Pre-Biased Output

　　Output Voltage and Output Current Reporting

　　External Temperature Monitoring with 2N3904 Transistor

　　Programmable via the PMBus interface

　　VOUT_COMMAND and AVS VOUT Transition Rate

　　Overcurrent Protection with Thermal Compensation

　　UVLO, Soft-Start and Soft-Stop

　　PGOOD, OV, UV, OT Levels

　　Fault Responses

　　Turn-On and Turn-Off Delays

　　Thermal Shutdown

　　Pin Strapping for Switching Frequency: 200 kHz to 1 MHz

　　Frequency Synchronization to an External Clock

　　Footprint Compatible 20-A, 30-A Converters

　　TPS544x25应用:

　　Test and Instrumentation

　　Ethernet Switches, Optical Switches, Routers, Base Stations

　　Servers

　　Enterprise Storage SSD

　　High-Density Power Solutions

　　图.TPS544x25功能框图

　　评估模块PWR681EVM

　　The PWR681EVM evaluation module uses either the TPS544B25 or TPS544C25 devices. TheTPS544B25 and TPS544C25 are highly integrated synchronous buck converters that are designed for upto 20-A or 30-A current output, respectively.

　　The PWR681EVM is designed as a single output DC-DC converter that demonstrates either theTPS544B25 or the TPS544C25 in a typical low-voltage application while providing a number of test pointsto evaluate the performance. It uses a nominal 12-V input bus to produce a regulated 0.95-V output at upto either 20-A or 30-A of load current, depending on the device installed.

　　评估模块PWR681EVM终端应用:

　　• High-Density Power Solutions

　　• Communications Equipment

　　• Servers and Computing Equipment

　　• Smart Power Systems

　　评估模块PWR681EVM主要特性:

　　• Regulated 0.95-V output up to 30-ADC, steady-state output current

　　• Configuarable features via the PMBus interface include:

　　– Programmable Output Voltage via the PMBus Interface

　　– Programmable UVLO, Soft Start, and Enable via the PMBus Interface

　　– Programmable Overcurrent Warning, Fault Limits and Programmable Response to Faults via thePMBus Interface

　　– Programmable Overvoltage, Undervoltage Warning, Fault Limit and Programmable Response toFaults via the PMBus Interface

　　– Programmable external Overtemperature Warning, Fault Limit and Programmable Response toFaults via the PMBus Interface

　　• Convenient Test Points for Probing Critical Waveforms

　　• Optional External Temperature Sensor

　　图.评估模块PWR681EVM外形图