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  • MCP19111 PMBus Protocol-Enabled Point-of-Load Converter

  • Created: Jun 02, 2016

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Summary

Nowadays, industries are challenged by high peak current demands that are required by high-performance semiconductors. Among these semiconductors include microcontrollers and Application-Specific ICs (ASICs). Due to these demands, there is a need to place individual power supply regulators close to the point of use. Also, Point-of-Load (POL) power supplies are useful to increase low noise margins that are necessary for high-performance applications in the industries. This reference design is a PMBus protocol-enabled point-of-load converter, which demonstrates how the MCP19111 device operates in a synchronous buck topology over a wide input voltage and load range.


This circuit is specifically designed to provide a compact, low-cost, and efficient step-down conversion from low to medium output currents. This design accepts an input voltage that ranges from 8V to 14V, and outputs a voltage of 1.2V. This also features a status report via the PMBus communication protocol. Status report includes errors, input voltage, output voltage and current. For precise measurements of the output current, an op amp MCP6001 and an inductor temperature sensor MCP9700 are used in the design. The PMBus monitoring Graphical User Interface (GUI) can be used to program the functioning parameters and to check the operational status. To simplify the connection, a USB to PMBus converter is implemented on board, allowing a standard interface to any Windows computer. The board also contains headers for In-Circuit Serial Programming (ICSP) as well as I2C and mini-USB communication, pull-up and pull-down resistor pads and test point pads on each GPIO pin, and a pushbutton for system development.


This design is intended for high-performance applications that also require high noise margins. This design explores the capability of MCP19111, which is a highly integrated, mixed signal, Analog Pulse-Width Modulation (PWM) current mode controller with an integrated microcontroller core for synchronous DC-to-DC step-down applications.

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