MCP1663 MINI-MODULE SEPIC
CONVERTER EVALUATION BOARD
USER’S GUIDE
2019 Microchip Technology Inc.
DS50002846A-page 7
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP1663 Mini-Module SEPIC Converter
Evaluation Board and covers the following topics:
•
•
What is the MCP1663 Mini-Module SEPIC Converter Evaluation Board?
•
What the MCP1663 Mini-Module SEPIC Converter Evaluation Board Kit Contains
1.2
MCP1663 SHORT OVERVIEW
The MCP1663 is a compact, high-efficiency, fixed-frequency, non-synchronous step-up
DC-DC converter which integrates a 36V, 400 m
switch. This product provides a
space-efficient, high-voltage step-up, easy-to-use power supply solution and is
configurable in various DC-DC topologies.
The MCP1663 offers the advantage of a minimum number of external components for
applications powered by two-cell or three-cell alkaline, Ultimate Lithium
®
, Ni-Cd,
Ni-MH, one-cell Li-Ion or Li-Polymer batteries.
The MCP1663 operates in Pulse-Width Modulation (PWM), at a fixed 500 kHz switch-
ing frequency. The device features an Undervoltage Lockout (UVLO), which prevents
Fault operation below 1.85V typical (UVLO Stop), corresponding to the value of two dis-
charged alkaline batteries. The MCP1663 starts its normal operation at 2.3V input volt-
age, typically (UVLO Start), and the operating input voltage ranges up to 5.5V.
For standby applications, MCP1663 can be turned off by pulling the EN pin to GND.
The device will stop switching and will consume 300 nA of input current. Note that,
while in Shutdown mode, the input voltage will be bypassed to the output through the
inductor and the Schottky diode. In the Step-Up/Step-Down configuration, using a
SEPIC (Single-Ended Primary Inductor Converter), there is no direct path from input to
output. Connecting the EN pin to GND will provide an output disconnect.
MCP1663 also provides overvoltage protection (OVP) in the event of:
• Short-circuit of the feedback pin to GND
• Disconnected feedback divider from V
OUT
In these conditions, the OVP will stop the switching and will prevent damage to the
device. This feature is disabled during the start-up sequence and thermal shutdown.
The goal of the MCP1663 Mini-Module SEPIC Converter Evaluation Board is to
demonstrate the capabilities of the MCP1663 device used in the SEPIC topology for
applications designed in a very small form factor like the DDPAK package.
1.2.1
SEPIC TOPOLOGY
The SEPIC topology is commonly used in battery-powered devices as it requires the
minimum number of components in order to develop a DC-DC power converter that
provides a positive regulated output voltage from either a lower or a higher input volt-
age. This type of converter follows the flyback design, adding a coupling capacitor
between the windings of the transformer.
