MCP19111 PMBus™
PROTOCOL-ENABLED POL
CONVERTER REFERENCE DESIGN
USER’S GUIDE
2015 Microchip Technology Inc.
DS50002379A-page 13
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP19111 PMBus™ Protocol-Enabled
Point-of-Load Converter Reference Design and covers the following topics:
•
MCP19111 Device Short Overview
•
What is the MCP19111 PMBus™ Protocol-Enabled Point-of-Load Converter
Reference Design?
•
What the MCP19111 PMBus™ Protocol-Enabled Point-of-Load Converter
Reference Design Kit Contains?
1.2
MCP19111 DEVICE SHORT OVERVIEW
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 I
2
C™ 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 V
DD
pin.
It is recommended that a 1
μ
F capacitor be placed between V
DD
and P
GND
. The V
DD
pin may also be directly connected to the V
DR
pin or connected through a low-pass
RC filter. The V
DR
pin provides power to the internal synchronous driver.
NOTICE TO CUSTOMERS
The present reference design is intended to be used only to prove the MCP19111 functionality
and performance, solely in laboratory environment. Microchip Technology Inc. assumes no
liability for any damage resulting from using the present reference design in other purposes.
CAUTION
All the functionalities described in this document are specific to the original firmware
loaded in the MCP19111. Once the user software is loaded, the PMBus communication
and board settings become the user’s responsibility.