MICROCHIP DS51652A Technical data

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MCP1603

Buck Converter

Evaluation Board

User’s Guide

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

MCP1603 BUCK CONVERTER

EVALUATION BOARD USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Introduction............................................................................................................ 1

Document Layout .................................................................................................. 1

Conventions Used in this Guide ............................................................................ 2

Recommended Reading........................................................................................ 2

The Microchip Web Site ........................................................................................ 3

Customer Support ................................................................................................. 3

Document Revision History................................................................................... 3

Chapter 1. Product Overview ....................................................................................... 5

1.1 Introduction ..................................................................................................... 5

1.2 What is the MCP1603 Buck Converter Evaluation Board? ............................ 6

1.3 What the MCP1603 Buck Converter Evaluation Board Kit includes .............. 6

Chapter 2. Installation and Operation ......................................................................... 7

2.1 Introduction ..................................................................................................... 7

2.2 Features ......................................................................................................... 7

2.3 Getting Started ............................................................................................... 7

Appendix A. Schematic and Layouts ........................................................................... 9

A.1 Introduction .................................................................................................... 9

A.2 Board - Schematic ....................................................................................... 10

A.3 Board - Top Silk Layer ................................................................................. 11

A.4 Board - Top Metal Layer .............................................................................. 12

A.5 Board - Bottom Metal Layer ......................................................................... 13

Appendix B. Bill Of Materials (BOM) .......................................................................... 15

Worldwide Sales and Service .................................................................................... 16

MCP1603 Buck Converter Evaluation Board User’s Guide

NOTES:

MCP1603 BUCK CONVERTER

EVALUATION BOARD USER’S GUIDE

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 page 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 on-line help files.

IDE on-line help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the MCP1603 Buck Converter Evaluation Board. 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 MCP1603 Buck Converter Evaluation Board as a development tool to evaluate the MCP1603. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP1603

Buck Converter Evaluation Board.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get

started with this user’s guide and a description of the user’s guide.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout

diagrams for the MCP1603 Buck Converter Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the

MCP1603 Buck Converter Evaluation Board.

MCP1603 Buck Converter Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters 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 brackets < > 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 repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix 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 mutually exclusive 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)

{ ... }

Chapter 1. Product Overview

Input

MCP1603

OUT

2.7V - 5.5V

Voltage

Buck

Regulator

Setting

Switches

500 mA

(maximum)

1.1 INTRODUCTION

Step-down converter choices include a variety of linear and switching regulators. The MCP1603 500 mA synchronous buck regulator provides a low profile, cost effective, and efficient solution for devices like cellular telephones, USB-powered devices and hand held instruments. The device provides a solution with minimal board space because of the high-frequency operation, which reduces the size requirements of the external inductor and capacitor and the 1 mm maximum height TSOT package.

The MCP1603 switches at a fixed frequency of 2.0 MHz when operating at a heavy load. This provides a low-noise, small size solution. When operating at light loads, the MCP1603 changes operation to a pulse frequency modulation (PFM) mode to minimize quiescent current drawn from the input source. No intervention is necessary for smooth transition from one mode to another.

This chapter covers the following topics.

• "What is the MCP1603 Buck Converter Evaluation Board?”

• "What the MCP1603 Buck Converter Evaluation Board Kit includes.”

MCP1603 BUCK CONVERTER

EVALUATION BOARD USER’S GUIDE

FIGURE 1-1: MCP1603 Buck Converter Evaluation Board Block Diagram.

MCP1603 Buck Converter Evaluation Board User’s Guide

1.2 WHAT IS THE MCP1603 BUCK CONVERTER EVALUATION BOARD?

The MCP1603 Buck Converter Evaluation Board demonstrates the use of Microchip’s MCP1603 device in a step-down application. The evaluation board is a fully functional platform to evaluate the MCP1603 buck regulator over the input voltage, output voltage and current range of the device.

Test points are provided to allow easy connection of the input voltage source and the output load.

1.3 WHAT THE MCP1603 BUCK CONVERTER EVALUATION BOARD KIT

INCLUDES

This MCP1603 Buck Converter Evaluation Board kit includes:

• MCP1603 Buck Converter Evaluation Board (102-00133)

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- MCP1603 Buck Converter Evaluation Board User’s Guide (DS51652)

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP1603 Buck Converter Evaluation Board is designed to demonstrate Microchip’s MCP1603 in an adjustable output voltage configuration. The MCP1603 is a 500 mA synchronous buck regulator that features both Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM). The PFM mode is used at light loads to improve system efficiency while the 2.0 MHz PWM mode is entered at heavy loads. The transition between PFM and PWM modes automatically occurs without any external intervention. The MCP1603 is available in both adjustable parts that require an external divider to set the output voltage and fixed output voltage parts.

The high switching speed and TSOT package (1 mm maximum height) make the MCP1603 ideal for space constrained applications that require an efficient stepped down voltage.

2.2 FEATURES

The MCP1603 Buck Converter Evaluation Board has the following features:

• Compact size and low profile 500 mA converter design.

• Wide Input voltage range from 2.7V to 5.5V.

• Five different output voltage settings: 0.8V, 1.2V, 1.8V, 2.5V, and 3.3V.

• Test points for connecting input voltage source and external load.

MCP1603 BUCK CONVERTER

EVALUATION BOARD USER’S GUIDE

2.3 GETTING STARTED

The MCP1603 Buck Converter Evaluation Board is fully assembled and tested for evaluating the MCP1603 device. The board requires the use of an external input voltage source of 2.7V to 5.5V and an external load capable of 500 mA.

2.3.1 Power Input and Output Connection

2.3.1.1 POWERING THE MCP1603 BUCK CONVERTER EVALUATION BOARD

1. Connect the positive side of the input source (+) to TP1 (VIN).

2. Connect the negative or return side (-) of input source to TP2 (GND). Refer to Figure 2-1. The input voltage should be limited from 2.7V to 5.5V range.

MCP1603 Buck Converter Evaluation Board User’s Guide

FIGURE 2-1: Setup Configuration Diagram.

2.3.1.2 APPLYING LOAD TO MCP1603 BUCK CONVERTER EVALUATION BOARD

1. Connect the positive side of the load (+) to TP3 (VOUT).

2. Connect the negative side of the load (-) to TP4 (GND). Refer to Figure 2-1. The

maximum load current should not exceed 500 mA.

As an alternative, a resistor can be connected between TP3 and TP4. The value of this resistor must be sized such that the maximum load current does not exceed 500 mA for the selected output voltage.

2.3.1.3 SETTING THE OUTPUT VOLTAGE ON THE MCP1603 BUCK CONVERTER EVALUATION BOARD

The output voltage of the MCP1603 Buck Converter Evaluation Board is set by the position of switch S1 locations. Table 2-1 shows the position of the four S1 switch locations to achieve the five different standard output voltages.

TABLE 2-1: SETTING THE OUTPUT VOLTAGE

Output Voltage S1 - POS1 S1 - POS2 S1 - POS3 S1 - POS4

0.8V Off Off Off Off

1.2V Off Off Off On

1.8V Off Off On Off

2.5V Off On Off Off

3.3V On Off Off Off

Evaluating the Application

The best way to evaluate the MCP1603 Buck Converter Evaluation Board is to dig into the circuit. Measure voltages and currents with a DVM and probe the board with an oscilloscope.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP1603 Buck Converter Evaluation Board:

• Board – Schematic

• Board – Top Silk Layer

• Board – Top Metal Layer

• Board – Bottom Metal Layer

MCP1603 BUCK CONVERTER

EVALUATION BOARD USER’S GUIDE

MCP1603 Buck Converter Evaluation Board User’s Guide

A.2 BOARD - SCHEMATIC

A.3 BOARD - TOP SILK LAYER

Schematic and Layouts

MCP1603 Buck Converter Evaluation Board User’s Guide

A.4 BOARD - TOP METAL LAYER

A.5 BOARD - BOTTOM METAL LAYER

Schematic and Layouts

MCP1603 Buck Converter Evaluation Board User’s Guide

NOTES:

MCP1603 BUCK CONVERTER

EVALUATION BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

2 C1, C2 Cap Ceramic 4.7µF 6.3V X5R 0603 Panasonic 1 C3 Cap Ceramic 33 pF 50V 0603 Panasonic - ECG ECJ-1VC1H330J 1 L1 4.7 µH Inductor Coiltronics SD3812-4R7-R 1 R1 Res 200 kΩ 1/10W 1% 0603 Panasonic - ECG ERJ-3EKF2003V 1 R2 Res 402 kΩ 1/10W 1% 0603 Panasonic - ECG ERJ-3EKF4023V 1 R3 Res 160 kΩ 1/10W 5% 0603 Panasonic - ECG ERJ-3GEYJ164V 1 R4 Res 499 kΩ 1/10W 1% 0603 Panasonic - ECG ERJ-3EKF4993V 1 R5 Res 63.4 kΩ 1/10W 1% 0603 Panasonic - ECG ERJ-3EKF6342V 1 R6 Res 93.1 kΩ 1/10W 1% 0603 Panasonic - ECG ERJ-3EKF9312V 1 R7 Res 4.99 kΩ 1/10W 1% 0603 Panasonic - ECG ERJ-3EKF4991V 1 S1 Switch DIP SPST Sealed 4POS SMD ITT Industries / C&K Div SD04H1SK 4 TP1, TP2, TP3,

TP4

1 U1 500 mA Synchronous Buck Regulator Microchip Technology Inc. MCP1603L-ADJI/OS Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM

used in manufacturing uses all RoHS-compliant components.

PC Test Point Compact SMD Keystone Electronics

- ECG ECJ-1VB0J475K

5016

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12/08/06

MICROCHIP DS51652A Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP1603 BUCK CONVERTER EVALUATION BOARD?

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 BOARD - SCHEMATIC

A.3 BOARD - TOP SILK LAYER

A.4 BOARD - TOP METAL LAYER

A.5 BOARD - BOTTOM METAL LAYER

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE