Linear Technology Corporation introduced the LTM4676A, a new dual 13A or single 26A, current sharing, up to 100A µModule (micro-module) step-down DC-DC regulator with PMBus string Line digital interface. Digital interfaces allow system designers and remote operators to command and monitor system power conditions and power consumption.
The LTM4676A µModule regulator has a 70ms power-up time, an 8ms ADC telemetry update rate, and a 400kHz PMBus-compatible I²C serial interface. These improvements enable faster system startup time and faster power data collection in applications with the longest startup time requirements, such as PCIe-based platforms. Examples of end products include optical transmission systems, data communications and telecommunications switches and routers, industrial test equipment, robotics, and RAID and enterprise systems where the cost of electricity, cooling, and maintenance is critical and must be continuous And accurate measurement.
The LTM4676A consists of EEPROM, power MOSFET, inductor and supporting components. It features fast dual analog control loops, precision mixed-signal circuits, and is packaged in a 16mm x 16mm x 5.01mm BGA (ball grid array) package.
In addition to powering the point of load, the LTM4676A has configurability and telemetry monitoring capabilities based on power and power management parameters over PMBus (an open standard digital serial interface protocol based on I2C). The LTM4676A operates from a 4.5V to 17V input supply and steps down VIN to two outputs ranging from 0.5V to 5.4V. The two channels can share current to provide up to 26A (ie, one output is 13A + 13A). Up to 4 LTM4676A devices can be shared in multiple phases to share currents up to 100A output.
To evaluate the performance of the LTM4676A, LTpowerPlay GUI (graphical user interface, free download), USB to PMBus converter and demo kit (DC1811B-KIT) are provided. The LTM4676A has a maximum DC output error of ± 0.5% over the entire temperature range, a current readback accuracy of ± 2.5%, and an integrated 16-bit delta-sigma ADC and EEPROM, mixing first-class analog switching regulator performance with precision Combination of signal data acquisition. At startup, the output voltage, switching frequency, and channel phase angle assignments can be set via pin jumper resistors. The LTM4676A's internal operating temperature range is -40C to 125C.
