Microchip Technology ARD00386 Data Sheet

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MCP1640 12V/50 mA TWO CELLS
INPUT BOOST CONVERTER
REFERENCE DESIGN
© 2011 Microchip Technology Inc.
DS51999A-page 9
Chapter 1.  Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP1640 12V/50 mA Two Cells Input Boost 
Converter Reference Design and covers the following topics:
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/C device automatically selects the best operating mode for efficiency, 
PWM (Pulse-Width Modulation) or PFM (Pulse Frequency Modulation). The 
MCP1640B/D device is running in PWM mode only and is ideal for noise sensitive 
applications. It has a low quiescent current (19 µA, PFM mode typical), 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:
PART NUMBER SELECTION
The MCP1640 is available in 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”
 (DS22234).
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