原标题：Linear LTM4677 36A降压μModuleR模块电源解决方案

　　Linear公司的LTM4677双18A或单36A降压μModuleR(电源模块)DC/DC稳压器,通过PMBus可进行遥控配置和远程监测电源管理参数.器件包括快速模拟控制回路,精密混合信号电路,EEPROM,功率MOSFET,电感和支持元件,主要用在通信,数据通信和存储系统电源以及多种系统优化.本文介绍了LTM4677主要特性,框图,应用框图和多种应用电路,以及36A演示板DC2066A主要特性,电路图,材料清单和PCB设计文件.

　　The LTMR4677 is a dual 18A or single 36A step-downμModuleR (power module) DC/DC regulator featuringremote configurability and telemetry-monitoring of powermanagement parameters over PMBus— an open standardI2C-based digital interface protocol. The LTM4677 iscomprised of fast analog control loops, precision mixedsignalcircuitry, EEPROM, power MOSFETs, inductors andsupporting components.

　　The LTM4677’s 2-wire serial interface allows outputs to bemargined, tuned and ramped up and down at programmableslew rates with sequencing delay times. Input and output currents and voltages, output power, temperatures, uptimeand peak values are readable. Custom configuration ofthe EEPROM contents is not required. At start-up, outputvoltages, switching frequency, and channel phase angleassignments can be set by pin-strapping resistors. TheLTpowerPlay™ GUI and DC1613 USB-to-PMBus converter anddemo kits are available.

　　The LTM4677 is pin compatible with the LTM4676A (dual13A) and is offered in a 16mm × 16mm × 5.01mm BGA packageavailable with SnPb or RoHS compliant terminal finish.

　　LTM4677主要特性:

　　Dual, Fast, Analog Loops with Digital Interfacefor Control and Monitoring

　　Wide Input Voltage Range: 4.5V to 16V

　　Output Voltage Range: 0.5V to 1.8V

　　±0.5% Maximum DC Output Error Over Temperature

　　±2.5% Current Readback Accuracy

　　Pin Compatible with LTM4676A (Dual 13A, Single 26A)

　　400kHz PMBus-Compliant I2C Serial Interface

　　Supports Telemetry Polling Rates up to 125Hz

　　Integrated 16-Bit ΔΣ ADC

　　Constant Frequency Current Mode Control

　　Parallel and Current Share Multiple Modules

　　16mm × 16mm × 5.01mm BGA Package

　　Readable Data:

　　Input and Output Voltages, Currents, and Temperatures

　　Running Peak Values, Uptime, Faults and Warnings

　　Onboard EEPROM Fault Log Record

　　Writable Data and Configurable Parameters:

　　Output Voltage, Voltage Sequencing and Margining

　　Digital Soft-Start/Stop Ramp

　　OV/UV/OT, UVLO, Frequency and Phasing

　　LTM4677应用:

　　System Optimization, Characterization and Data Miningin Prototype, Production and Field Environments

　　Telecom, Datacom, and Storage Systems

　　图1. LTM4677框图

　　图2. LTM4677应用框图

　　图3. LTM4677应用电路:36A,1.2V输出,I2C/SMBus/PMBus串口

　　图4. LTM4677应用电路:18A,1.0V和1.5V输出,3.3V输入,I2C/SMBus/PMBus串口

　　图5.四个LTM4677并联应用电路:144A输出,I2C/SMBus/PMBus串口

　　图6. LTM4677和三个LMT4630A应用电路:144A输出,I2C/SMBus/PMBus串口

　　演示板DC2066A

　　Demonstration circuit 2066A is a dual-output, high efficiency,high density, μModule regulator with 4.5V to16V input range. Each output can supply 18A maximumload current. The demo board has a LTM®4677 μModuleregulator, which is a dual 18A or single 36A step-downregulator with digital power system management. Pleasesee the LTM4677 data sheet for more detailed information.

　　DC2066A powers up to default settings and produces powerbased on configuration resistors without the need for anyserial bus communication. This allows easy evaluation ofthe DC/DC converter. To fully explore the extensive powersystem management features of the part, download theGUI software LTpowerPlay™ onto your PC and use LTC’sI2C/SMBus/PMBus dongle DC1613A to connect to theboard. LTpowerPlay allows the user to reconfigure the parton the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

　　图7.双输出演示板DC2066A外形图

　　双输出演示板DC2066A材料清单: