MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST CONVERTER
EVALUATION BOARD USER’S GUIDE
2015 Microchip Technology Inc.
DS50002353A-page 11
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP1642B/D High-Current Synchronous
Boost Converter Evaluation Board and covers the following topics:
• MCP1642B/D Device overview.
• What is the MCP1642B/D High-Current Synchronous Boost Converter Evaluation
• Contents of the MCP1642B/D High-Current Synchronous Boost Converter
1.2
MCP1642B/D DEVICE OVERVIEW
The MCP1642B/D are compact, high-efficiency, fixed frequency, step-up DC-DC
converters. These products provide an easy-to-use power supply solution, with a
minimum number of external components for applications powered by one-cell,
two-cell or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.
The MCP1642B/D operates in Pulse-Width Modulation (PWM), at a fixed 1 MHz
switching frequency, has a wide input voltage range, from 0.35 to 5.5V (with typically
0.65V start-up voltage at 1 mA load current).
The device is available in an 8-Lead MSOP package and an 8-Lead 2 x 3 mm DFN
package. Also, there are two shutdown options for the MCP1642B/D family:
• Output Disconnect mode (MCP1642B)
• Input-to-Output Bypass mode (MCP1642D)
For the fixed output voltage option of the MCP1642B/D devices, the feedback pin (V
FB
)
is not connected. The output voltage is set by an internal feedback divider. The
available fixed output values are 1.8V, 3.0V, 3.3V, 5V.
On the MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board,
the following options are used:
• MCP1642D-33 in DFN-8 package
• MCP1642B-ADJ in MSOP-8 package
The goal of the MCP1642B/D High-Current Synchronous Boost Converter Evaluation
Board is to demonstrate the high output current capabilities of the MCP1642B/D
devices.
TABLE 1-1:
PART NUMBER SELECTION BY SHUTDOWN OPTION
Part Number
True Output Disconnect
Input to output bypass
MCP1642B-ADJ
(or -18; 30; 33; 50)
X
—
MCP1642D-ADJ
(or -18; 30; 33; 50)
—
X
