Datasheet

 2013 Microchip Technology Inc. DS22331A-page 7
MCP19111
1.0 DEVICE OVERVIEW
The MCP19111 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 integra-
tion of the PIC
®
microcontroller mid-range core is used
to provide complete customization of device operating
parameters, start-up and shut down 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, bootstrap device, internal linear
regulator and 4 kW nonvolatile memory all in a
space-saving 28-pin 5 mm x 5mm QFN package.
After initial device configuration using Microchip’s
MPLAB
®
X Integrated Development Environment (IDE)
software, the PMBus or I
2
C can be used by a host to
communicate with, or modify, the operation of the
MCP19111.
Two internal linear regulators generate two 5V rails.
One 5V rail is used to provide power for the internal
analog circuitry and is contained on-chip. The second
5V rail provides power to the PIC device and is present
on the V
DD
pin. It is recommended that a 1 µF 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.
FIGURE 1-1: TYPICAL APPLICATION CIRCUIT
HDRV
BOOT
PHASE
LDRV
V
IN
V
DD
V
DR
+I
SEN
-I
SEN
+V
SEN
-V
SEN
GND
P
GND
GPB0
GPA7
GPA4
GPA1
GPB6
GPB7
GPA3
GPB2
GPA2
GPA5
GPB4
GPB5
GPA0
GPB1
GPA6
MCLR
ICDCLK
ICDDAT
SDA
SCL
SMBus Alert
SYNC
ADDR0
ADDR1
CNTL
PGOOD
TRACK
MCP19111
V
IN
+V
OUT
-V
OUT
X I CD
Programmer
MPLAB
®