Microchip Technology MCP1640 User Manual

MCP1640

12V/50 mA Two Cells Input

Boost Converter Reference Design

User’s Guide

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code hopping

MCP1640 12V/50 mA TWO CELLS

INPUT BOOST CONVERTER

REFERENCE DESIGN

Table of Contents

Preface ...........................................................................................................................5

Introduction............................................................................................................5

Document Layout .................................................................................................. 5

Conventions Used in this Guide............................................................................ 6

Recommended Reading.............................................................. .. ........................7

The Microchip Web Site........................................................................................ 7

Customer Support.................... .................................... .................. .......................7

Document Revision History................................................................................... 7

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................9

1.2 MCP1640 Short Overview .............................. ......................... .......................9

1.3 What is the MCP1640 12V/50 mA Two Cells Input Boost Converter

Reference D e si g n ? ................................................................................. 11

1.4 What Does the MCP1640 12V/50 mA Two Cells Input Boost Converter

Reference Design Kit Include? ............................ .................. .................11

Chapter 2. Installation and Operation

2.1 Introduction ...................................................................................................13

2.2 Getting Sta rted .... .................................................................................. ....... 15

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................19

A.2 Board – Schematic ... .................................................................... ................ 2 0

A.3 Board – Top Silk and Pads ..........................................................................21

A.4 Board – Top Copper and Pads ....................................................................22

A.5 Board – Bottom Copper and Pads ...............................................................23

Appendix B. Bill of Materials

Worldwide Sales and Service ....................................................................................26

MCP1640 12V/50 mA Two Cells Input Boost Converter Reference Design

NOTES:

MCP1640 12V/50 mA TWO CELLS

INPUT BOOST CONVERTER

REFERENCE DESIGN

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the p age number. The numbering convention for the DS number is “DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available online help files.

IDE online help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the MCP1640 12V/50 mA Two Cells Input Boost Converter Reference Design. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP1640 12V/50 mA Two Cells Input Boost Converter Refere nce Des ign as a develop ment t ool to ev aluate the MC P1640 de vice’ s capability to boost low voltages to a high output value, using a single inductor. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP1640 Input Boost Converter.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get started with the MCP1640 Input Boost Converter and a description of the User’s Guide.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP1640 Input Boost Converter.

• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP1640 Input Boost Converter.

MCP1640 12V/50 mA Two Cells Input Boost Converter Reference Design

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic chara c ters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brac kets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of digits, R is th e radi x and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mut ually exclus ive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information:

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Preface

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.

Technical support is available through the web site at:

http://www.microchip.com/support

DOCUMENT REVISION HISTORY

Revision A (September 2011)

• Initial Release of this Document.

MCP1640 12V/50 mA Two Cells Input Boost Converter Reference Design

NOTES:

MCP1640 12V/50 mA TWO CELLS

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:

• MCP1640 Short Overview

• What is the MCP1640 12V/50 mA Two Cells Input Boost Converter Reference

Design?

• What Does the MCP1640 12V/50 mA Two Cells Input Boost Converter Reference

Design Kit Include?

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.

INPUT BOOST CONVERTER

REFERENCE DESIGN

TABLE 1-1: PART NUMBER SELECTION

True Output

Part Number

MCP1640 X — X — MCP1640B — X X — MCP1640C X — — X MCP1640D — X — X

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).

PWM/PFM

Mode

PWM

Mode

Disconnect

Shutdown

Option

Input to Output

Bypass

Shutdown

Option

+ 18 hidden pages

Microchip Technology MCP1640 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Trademarks

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 MCP1640 SHORT OVERVIEW