Datasheet

MCP1640 SINGLE QUADRUPLE-A
BATTERY BOOST CONVERTER
REFERENCE DESIGN
 2010-2011 Microchip Technology Inc. DS51922B-page 9
Chapter 1. Product Overview
1.1 INTRODUCTION
This chapter provides an overview of the MCP1640 Single Quadruple-A Battery Boost
Converter Reference Design and covers the following topics:
• MCP1640 Short Overview
• What Is the MCP1640 Single Quadruple-A Battery Boost Converter Reference
Design?
• MCP1640 Single Quadruple-A Battery Boost Converter Reference Design Kit
Contents
1.2 MCP1640 SHORT OVERVIEW
The MCP1640 device is a compact, high-efficiency, fixed frequency, step-up DC-DC
converter. It provides 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 MCP1640 device automatically selects the best operating mode for efficiency,
PWM (Pulse-Width Modulation) or PFM (Pulse Frequency Modulation). It has a low
quiescent current (19 µA typically), a wide input voltage range (0.35 to 5.5V) and a low
start-up voltage (0.65V at 1 mA load current). The MCP1640 device consumes less
than 1 µA in Shutdown mode.
Microchip Technology Inc. provides the MCP1640 device in four variants, which help
engineers to meet different system requirements. The devices and their available
options are presented in Table 1-1.
TABLE 1-1: PART NUMBER SELECTION
The MCP1640 is available in a SOT23-6 and 8-LD DFN (2x3 mm) packages. For
additional information on the MCP1640 device, refer to the MCP1640/B/C/D Data
Sheet.
Part Number
PWM/PFM
Mode
PWM
Mode
True Output
Disconnect
Shutdown
Option
Input to Output
Bypass
Shutdown
Option
MCP1640 X — X —
MCP1640B — X X —
MCP1640C X — — X
MCP1640D — X — X