ARD00609: 1.2V @ 20A, 8 ~ 14V in, Buck

The MCP19111 device is a highly integrated, mixed signal, Analog Pulse-Width Modulation (PWM) Current mode controller with an integrated microcontroller core for synchronous DC/DC step-down applications. Since the MCP19111 uses traditional analog control circuitry to regulate the output of the DC/DC converter, the integration of the PIC® microcontroller mid-range core is used to provide complete customization of the device operating parameters, start-up and shutdown profiles, protection levels and Fault handling procedures.

The MCP19111 is designed to efficiently operate from a single, 4.5V to 32V supply. It features integrated synchronous drivers, a bootstrap device, internal linear regulator and 4000 words of nonvolatile memory, all in a space-saving, 28-pin 5 mm x 5 mm QFN package.

PMBus™ or I2C™ can be used by a host to communicate with, or modify the operation of, the MCP19111. A subset of the commands contained in the “PMBus™ Power System Management Protocol Specification, Revision 1.1” are supported by the ARD00609 board. An internal 5V rail provides power to the PIC MCU and is also present on the VDD pin.

It is recommended that a 1 μF capacitor be placed between VDD and PGND. The VDD pin may also be directly connected to the VDR pin or connected through a low-pass RC filter. The VDR pin provides power to the internal synchronous driver.