Microchip Technology MCP1726 Manual de usuario

MCP1726

Evaluation Board

User’s Guide

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MCP1726 EVALUATION

BOARD USER’S GUIDE

Table of Contents

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

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

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

1.2 What is the MCP1726 1A LDO Evaluation Board? ..................................6

1.3 What the MCP1726 1A LDO Evaluation Board Kit Includes ....................6

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

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

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

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

2.4 Testing Circuit 1 of the MCP1726 1A LDO Evaluation Board ..................8

2.5 Testing Circuit 2 of the MCP1726 1A LDO Evaluation Board ................10

Appendix A. Schematics and Layouts ......................................................................13

A.1 Introduction .............................................................................................13

A.2 Highlights ................................................................................................ 13

Appendix B. Bill-Of-Materials (BOM) .........................................................................19

Worldwide Sales and Service ....................................................................................20

MCP1726 Evaluation Board User’s Guide

NOTES:

MCP1726 EVALUATION

BOARD USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP1726 1A LDO 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 MCP1726 1A LDO Evaluation Board. The

manual layout is as follows:

•Chapter 1. “Product Overview” – Important information about the MCP1726 1A

LDO Evaluation Board.

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

started with this evaluation board and a description of the evaluation board

operation.

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

diagrams for the MCP1726 1A LDO Evaluation Board.

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

MCP1726 1A LDO Evaluation Board.

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.

MCP1726 Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

RECOMMENDED READING

This user's guide describes how to use MCP1726 1A LDO Evaluation Board. The

following Microchip documents are available and recommended as supplemental

reference resources.

MCP1726 Data Sheet, “1A, Low-Voltage, Low QuiescentCurrent LDO Regulator”,

DS21936

This data sheet provides detailed information regarding the MCP1726 product family.

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 “Save project before build”

Underlined, italic text with

right angle bracket A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

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

Courier font:

Plain Courier Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

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

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | } Choice of mutually exclusive

arguments; an OR selection errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user void main (void)

{ ...

}

Preface

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:

•Product Support – Data sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

•General Technical Support – Frequently Asked Questions (FAQs), technical

support requests, online discussion groups, Microchip consultant program

member listing

•Business of Microchip – Product selector and ordering guides, latest Microchip

press releases, listing of seminars and events, listings of Microchip sales offices,

distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

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://support.microchip.com

In addition, there is a Development Systems Information Line which lists the latest ver-

sions of Microchip's development systems software products. This line also provides

information on how customers can receive currently available upgrade kits.

The Development Systems Information Line numbers are:

1-800-755-2345 – United States and most of Canada

1-480-792-7302 – Other International Locations

DOCUMENT REVISION HISTORY

Revision A (April 2005)

• Initial Release of this Document.

MCP1726 Evaluation Board User’s Guide

NOTES:

MCP1726 EVALUATION

BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP1726 1A LDO Evaluation Board is used to evaluate the Microchip MCP1726

1A, low voltage, low-quiescent current, Low-Dropout (LDO) regulator. This evaluation

board contains two circuits, one for the 8-pin DFN package and one for the 8-pin SOIC

package. Each circuit allows the user to evaluate the adjustable or fixed-voltage

version of the part.

This chapter also covers the following topics:

• What is the MCP1726 1A LDO Evaluation Board?

• What the MCP1726 1A LDO Evaluation Board kit includes

FIGURE 1-1: MCP1726 Evaluation Board Schematic.

+VIN1

PGND

SHDN1

TP7TP8TP9

+VIN1

PGND

10 µF R9

10 kΩ

PGND

MCP1726_DFN

PGND

VIN

GND

SHDN

806Ω

+VIN1

VOUT

VADJ

CDELAY

PWRGD

5C6

0.01 µF

R10

100 kΩ

PGND

10 µF JP5JP6

806Ω

499Ω

VOUT1

Power Good

TP12

TP11

TP10

+VIN1

+VIN2

PGND

SHDN1

TP1TP2TP3

+VIN2

PGND

4.7 µF R1

10 kΩ

PGND

MCP1726_SOIC8

PGND

VIN

GND

SHDN

806Ω

+VIN2

VOUT

VADJ

CDELAY

PWRGD

5C3

1000 pF

100 kΩ

PGND

4.7 µF JP3JP2

806Ω

499Ω

VOUT2

Power Good

TP6

TP5

TP4

+VIN2

JP1

JP4

MCP1726 Evaluation Board User’s Guide

1.2 WHAT IS THE MCP1726 1A LDO EVALUATION BOARD?

The MCP1726 1A LDO Evaluation Board allows the user to evaluate both the fixed and

adjustable versions of the part in the 8-pin SOIC and 8-lead 3X3 DFN packages. An

on-boardpotentiometer allows theusertoeasilysettheoutputvoltageoftheadjustable

voltage version of the device. Status LEDs indicate when input voltage is applied and

when the Power Good (PWRGD) output is in a high condition (output voltage is in

regulation).

Connection terminals are provided for the input voltage, output voltage, ground, power

good and shutdown.

1.3 WHAT THE MCP1726 1A LDO EVALUATION BOARD KIT INCLUDES

This MCP1726 1A LDO Evaluation Board Kit includes:

• The MCP1726 1A LDO Evaluation Board

• MCP1726 1A LDO Evaluation Board User’s Guide (DS51550)

• MCP1726 Data Sheet (DS21936)

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