Microchip Technology MCP1650, User Manual

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M
MCP1650/1/2/3 EVALUATION
BOARD USER’S GUIDE

2004 Microchip Technology Inc. DS51462A-page 5
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP1650 Boost Controller Evaluation Board is designed to demonstrate
Microchip’s family of high-frequency boost controllers. The product family consists of
four high-frequency, boost-converter devices having different combinations of features.
All devices in the family feature 750 kHz high-frequency, low quiescent current,
shutdown capability and the MSOP package. The MCP1650 8-pin MSOP is the base
device. The MCP1651 8-pin MSOP includes all of the features of the MCP1650, with
the addition of a low battery detect and low battery output (LBO) indicator. The
MCP1652 8-pin MSOP includes all of the features of the MCP1650, with the addition
of a power good (PG) indicator. The PG indicator is an open-drain output that is
high-impedance when the output voltage of the converter is within ±15% of its intended
regulation range. When the output of the regulator is not within the ±15% range, the PG
pin will sink up to 10 mA. The MCP1653 10-pin MSOP has all features; the LBO and
PG, along with the base features of the MCP1650.
2.2 FEATURES
The MCP1650 Boost Controller Evaluation Board has the following features:
• Evaluation of the MCP1651 in a boost application configured in the Bootstrap
mode. This application circuit will regulate the output to 5V while delivering 1A of
current as the input voltage varies from 2.8V to 4.8V.
• Evaluation of the MCP1653 in a boost application configured in the non-Bootstrap
mode. This application circuit will regulate the output voltage to 12V while
delivering 400 mA of output current as the input voltage varies from 3.0V to 3.6V.
2.3 GETTING STARTED
The MCP1650 Boost Controller Evaluation Board is fully assembled and tested for
evaluation and demonstration of the MCP1650 family of boost controllers. This board
requires the use of external lab supplies and loads. Both application circuits have a
fuse for input overcurrent protection. As with all boost converters, there is a path from
V
IN
to V
OUT
through the boost inductor and output diode. In the case of a shorted out-
put, there is no means of protecting the inductor and diode, so an external fuse is
provided.
MCP1651R Application Circuit
1. Powering the MCP1651 bootstrap application circuit:
- Apply the input voltage to the surface-mount test points provided. The input
voltage source should be limited to the 2.8V to 4.8V range to regulate the
5V output. The input voltage must not exceed the +5.5V maximum rating of
the MCP165X. The source current necessary to regulate the output voltage
to +5V at 1A should be approximately 3A.
- Connect the positive side of the input source (+) to the +V
IN
_1 test point
(TP1). Connect the negative, or return side, (-) of the input source to the
GND test point (TP4) located next to +V
IN
_1.