The density of portable electronic equipment requires
the design engineer to pay particular attention to a
number of important design parameters. For the power
conversion circuitry, two of these parameters are the
efficiency and the total circuitry footprint. Keeping the
efficiency high extends battery life and controls the
temperature rise of the equipment. Limiting the circuitry
footprint helps minimize the size of the Printed Circuit
Board (PCB) and, ultimately, the total cost of the
device.
The MCP1612 is an ideal choice for such a design.
Since both the switching and synchronous MOSFETs
are internal and switching is 1.4 MHz, the inductor,
input and output capacitor size is minimized. The
output voltage is set by using a simple resistor divider,
with a high-bandwidth loop being accomplished by a
series resistor capacitor to ground. Efficiencies of 90%
and a typical shutdown current of 0.01 µA help to
extend battery life.
This Application Note contains all of the information
needed to design a synchronous buck converter using
the MCP1612. It also contains a real-world design
example with measured laboratory data. AN968
Simple Synchronous Buck Converter Design - MCP1612
Author: Cliff Ellison Solving the standard inductor equation for inductor
Microchip Technology Inc. ripple current (IL) yields:
VL
I L = -----
- × T
L
INTRODUCTION
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