原标题：Linear LTM4676 26A降压uModuleR DC电源解决方案

　　Linear公司的LTM4676是双路13A或单路26A的降压微模块(uModuleR) DC/DC稳压器,能通过PMBus总线对电源管理参数进行远距离配置和监视,具有双通道,快速和模拟环路,宽输入电压范围4.5V 至 26.5V,输出电压范围0.5V 至 5.4V,在整个温度范围内具有 ±1% 的最大 DC 输出误差,在 10A 负载条件下具有 ±2.5% 的电流回读准确度,符合 400kHz PMBus 标准的 I2C 串行接口,恒定频率电流模式控制,可对多个模块进行并联和均流,主要用在原型和生产中的系统优化,以及通信,数据通信和存储系统.本文介绍了LTMR4676主要特性框图和功能框图,多个应用电路以及DC1989A-C评估板主要特性,与PC连接图,电路图和材料清单.

　　The LTMR4676 is a dual 13A or single 26A step-down uModuleR (micromodule) DC/DC regulator featuring remote configurability and telemetry-monitoring of power management parameters over PMBus— an open standard I2C-based digital interface protocol . The LTM4676 is comprised of fast analog control loops, precision mixedsignal circuitry, EEPROM, power MOSFETs, inductors and supporting components.

　　The LTM4676’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. Input and output currents and voltages, output power, temperatures, uptime and peak values are readable. Custom configuration of the EEPROM contents is not required. At start-up, output voltages, switching frequency, and channel phase angle assignments can be set by pin-strapping resistors. The LTpowerPlay™ GUI and DC1613 USB-to-PMBus converter and demo kits are available.

　　The LTM4676 is offered in a 16mm × 16mm × 5.01mm BGA package and is RoHS compliant.

　　LTMR4676主要特性:

　　Dual, Fast, Analog Loops with Digital Interface for Control and Monitoring

　　Wide Input Voltage Range: 4.5V to 26.5V

　　Output Voltage Range: 0.5V to 5.4V (4V on VOUT0)

　　±1% Maximum DC Output Error Over Temperature

　　±2.5% Current Readback Accuracy at 10A Load

　　400kHz PMBus-Compliant I2C Serial Interface

　　Integrated 16-Bit ΔΣ ADC

　　Constant Frequency Current Mode Control

　　Parallel and Current Share Multiple Modules

　　16 Slave Addresses; Rail/Global Addressing

　　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

　　LTMR4676应用:

　　System Optimization, Characterization and Data Mining in Prototype, Production and Field Environments

　　Telecom, Datacom, and Storage Systems

　　图1.简化LTMR4676框图

　　图2.LTMR4676功能框图

　　图3.LTMR4676应用电路:26A/1.5V输出DC/DC μModule稳压器, I2C/SMBus/PMBus串行接口.

　　图4.LTMR4676应用电路:13A/1.2V和2.5V输出,3.3V输入, I2C/SMBus/PMBus串行接口.

　　图5.LTMR4676应用电路:四个器件并联,1.0V/100A输出, I2C/SMBus/PMBus串行接口.

　　图6.应用电路:一个LTM4676和三个LTM4620A或LTM4630并联,100-130A/1.0V输出.

　　图7. LTM4676应用电路:带串口的26A/5V输出DC/DC μModule稳压器

　　评估板1989A-C

　　Demonstration circuit 1989A-C is a high efficiency, high density, μModule regulator with 4.5V to 16V input range. The output voltage is adjustable from 0.5V to 4V, and it can supply 100A maximum load current. The demo board has four LTM®4676 μModule regulators. The LTM4676 is a dual 13A or single 26A step-down regulator with PMBus power system management.

　　DC1989A-C powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay™ onto your PC and use LTC’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

　　图8. LTM4676/DC1989A-C评估板外形图

　　图9. DC1989A-C评估板和PC连接图

　　DC1989A-C评估板材料清单: