Microchip Technology MCP1601 Manual de usuario

2003 Microchip Technology Inc. DS51315A

MCP1601

Evaluation Board

User’s Guide

DS51315A - page ii 2003 Microchip Technology Inc.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999

and Mountain View, California in March 2002.

The Company’s quality system processes and

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non-volatile memory and analog products. In

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Note the following details of the code protection feature on Microchip devices:

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Information contained in this publication regarding device

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Accuron, dsPIC, dsPICDEM.net, ECONOMONITOR,

FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming,

ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB,

MPLINK, MPSIM, PICC, PICkit, PICDEM, PICDEM.net,

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trademarks of Microchip Technology Incorporated in the U.S.A.

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Serialized Quick Turn Programming (SQTP) is a service mark of

Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

2002 Microchip Technology Inc. DS51315A-page iii

MMCP1601 Eval. Board

User Guide

Table of Conte nts

General Information .................................................................................. 1

Introduction And Highlights.................................................................. 1

About ThisGuide..................................................................................1

The Microchip Internet Web Site...........................................................2

Customer Support.................................................................................2

Chapter 1. MCP1601 Evaluation Board ...............................................3

1.1 Introduction ................................................................................ 3

1.2 Detailed Description .................................................................. 4

1.3 Test Points ................................................................................ 6

Appendix A. Schematic and Board Layouts ......................................... 7

A.1 Introduction................................................................................ 7

A.2 Evaluation Board Schematic ................................................... 8

A.3 Evaluation Board - Silk Screen Layer ...................................... 8

A.4 Evaluation Board - Top Metal Layer ........................................ 9

A.5 Evaluation Board - Bottom Metal Layer ................................... 9

Appendix B. Bill Of Materials (BOM).................................................... 11

MCP1601 Eval. Board User Guide

DS51315A-page iv 2002 Microchip Technology Inc.

NOTES:

2003 Microchip Technology Inc. DS51315A-page 1

MMCP1601 Eval. Board

User Guide

GeneralInformation

INTRODUCTION AND HIGHLIGHTS

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

MCP1601 Evaluation Board.

This section covers the following topics:

• About this Guide

• Recommended Reading

• The Microchip Internet Web Site

• Customer Support

ABOUT THIS GUIDE

Document Layout

This document describes how to use the MCP1601 Evaluation Board.

The User’s Guide layout is as follows:

•Chapter 1: MCP1601 Evaluation Board - For user’s evaluating the MCP1601

device, this section describes how to use the various features of the board.

Appendices

•Appendix A: Schematic and Board Layout – shows the schematic and Printed

Circuit Board (PCB) layout diagrams for the MCP1601 Evaluation Board.

-AppendixA.1 gives someoverview and highlightinformation.

-AppendixA.2 contains the Evaluation Board Schematic

-AppendixA.3 shows the SilkScreen Layer of the PCB.

-AppendixA.4 shows the SilkScreen and Top Metal Layerof the

PCB.

-AppendixA.5 shows the SilkScreen and Bottom Metal layer of the

PCB.

•Appendix B: Bill of Materials – Table B-1 shows the Bill of Materials (BOM) for

the PCB.

•Worldwide Sales and Service – gives the address, telephone and fax number

for Microchip Technology Inc. sales and service locations throughout the world.

Recommended Reading

For more information regarding the MCP1601 device, the following is recommended

reading:

MCP1601 Data Sheet (DS21762)

This data sheet provides detailed information regarding the MCP1601 500 mA Syn-

chronous BUCK Regulator. The data sheet is available for download from our World

Wide Web Site (www.microchip.com) or from the Technical Library CD-ROM

(DS00161).

MCP1601 Eval. Board User Guide

DS51315A-page 2 2003 Microchip Technology Inc.

THE MICROCHIP INTERNET WEB SITE

Microchip provides easy access to our documentation and on-line support through our

World Wide Web Site at www.microchip.com. You can download files from the web site

or from our FTP site at ftp://ftp.microchip.com

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Corporate Applications Engineer (CAE)

• Hot line

Customers should call their distributor, representative or field application engineer

(FAE) for support. Local sales offices are also available to help customers. See the

back cover for a listing of sales offices and locations.

Corporate Applications Engineers (CAEs) may be contacted at (480) 792-7627.

In addition, there is a Systems Information and Upgrade Line. This line provides system

users a listing of the latest versions of all of Microchip's development systems software

products. Plus, this line provides information on how customers can receive any cur-

rently available upgrade kits.

The Hot Line Numbers are:

• 1-800-755-2345 for U.S. and most of Canada, and

• 1-480-792-7302 for the rest of the world

2003 Microchip Technology Inc. DS51315A-page 3

MMCP1601 Eval. Board

User Guide

Chapter 1. MCP1601 Evaluation Board

1.1 INTRODUCTION

The MCP1601 Evaluation Board is designed to demonstrate the use of the MCP1601

Synchronous BUCK Regulator in a step down, inductor-based DC/DC converter

application. It also describes the capability of the MCP1601 Evaluation Board and how

to select the desired Synchronous Converter operating mode and program the output

voltage.

The Evaluation Board Schematic is shown is Figure 1-1.

FIGURE 1-1: MCP1601 Evaluation Board Schematic.

OUT

Output

AGND

Input

AGNDAGND AGNDAGND

1.24 MΩ

2 1

TP6

SYNC/PWM

2 pos Switch

2 3

1ON

634 KΩ

2 1

1.0 MΩ

10 µF

TP2

10 µH

TP1

+VIN

619 KΩ

MCP1601

4 5

SHDN

AGND SYNC/

PWM

OUT

PGND

TP7

AGND

TP3

Pgnd C3

47 pF

200 KΩ

TP5

/SHDN

2 pos Switch

2 3

TP4

PGND

2ON

MCP1601 Eval. Board User Guide

DS51315A-page 4 2003 Microchip Technology Inc.

1.2 DETAILED DESCRIPTION

The MCP1601 is a 500 mA Synchronous BUCK Regulator. Both the high-side BUCK

P-Channel and the low-side N-Channel switches are integrated within the device. The

integrated synchronous switch makes the MCP1601 very efficient, even when convert-

ing unregulated input voltages to low voltage fixed outputs. This evaluation board is

designed for a wide range of output voltages and currents. For specific applications,

smaller inductors, shielded inductors, tantalum capacitors and different output voltage

settings can improve the total DC/DC converter performance and cost.

The MCP1601 device can operate in three different modes of operation to optimize the

efficiency of the voltage conversion. The three operating modes are:

• Automatic switching from PFM Mode to PWM mode and back

• Synchronization to external Oscillator

• Fixed Frequency Forced PWM Mode

The MCP1601 output voltage is adjustable and is set by two external divider resistors.

A two-position switch is used on the MCP1601 Evaluation Board to change the resis-

tance of the external divider and adjust the output voltage to four different settings.

These output voltage settings are: 1.8V, 2.05V, 2.45V and 3.28V.

1.2.1 Applying Power to the Board

Two surface mount test points are used to apply power to the MCP1601 Evaluation

Board. For proper operation, the input voltage range is 2.7V < +VIN < +5.5V for all oper-

ating conditions. The MCP1601 has an internal Under-Voltage Lockout (UVLO) which

will prevent the board from operating when the input voltage is below the specified 2.7V

minimum.

1. Connect the positive side of the external power supply (+) to the +VIN test point.

2. Connect the negative side (GND) of the external power supply to the PGND test

point which is located directly below the +VIN test point.

1.2.2 Connecting a Load to the Board

To connect an external load to the board, the +VOUT and PGND test points are used.

• Connect the positive side of the load to the +VOUT pin and the negative or ground

side of the load to the PGND test point located directly under the +VOUT test point.

The MCP1601 output is rated for 500 mA (maximum) continuous current. The out-

put is protected against over current and short circuit conditions.

1.2.3 Enabling the MCP1601 - Using Switch U3, Position 1

Switch U3, position 1 is used to determine the SHDN mode for the MCP1601 device.

With switch U3, position 1 pushed to the right, the SHDN pin is pulled up and the output

of the MCP1601 device is enabled. When switch U3, position 1 is to the left, the

MCP1601 device is in a low quiescent current SHDN mode and the output is disabled.

2003 Microchip Technology Inc. DS51315A-page 5

MCP1601 Evaluation Board

1.2.4 Selecting the Operating Mode - Using Switch U3, Position 2

The multi-function SYNC/PWM pin on the MCP1601 is used to set the operating mode

of the device. The three operating modes are:

• Automatic switching from PFM Mode to PWM mode and back

• Synchronization to external Oscillator

• Fixed Frequency Forced PWM Mode

To select automatic PFM/PWM mode:

• Slide switch U3, position 2 to the left or off position. While operating in this mode,

the MCP1601 device will automatically select the most efficient operating mode

by approximating the load current internally.

To synchronize the MCP1601 switching frequency to an external oscillator:

• Slide switch U3, position 2 to the left. Connect the external oscillator to the

SYNC/PWM test point located directly below switch U3and the AGND test point.

See the MCP1601 datasheet (DS21762) for external clock specifications. When

synchronizing to an external oscillator, the MCP1601 will operate in the fixed

frequency mode at the same frequency as the external oscillator.

To select fixed frequency mode that operates off of the 750 kHz internal oscillator:

• Slide switch U3, position 2 to the right or “on” position. This will tie the SYNC/PWM

pin high and force PWM operation from the internal oscillator, making the

MCP1601 device independent of external load conditions.

1.2.5 Selecting the MCP1601 output voltage

Switch U2is used to select the output voltage. Refer to Table 1-1 to choose one of the

pre-selected output voltages.

TABLE 1-1: SWITCH SETTINGS FOR PRE-SELECTED OUTPUT

VOLTAGES

The output voltage for the MCP1601 device is determined by using the following for-

mula.

EQUATION

U2, Position 1 U2, Position 2 VOUT

OFF OFF 3.28V

OFF ON 2.45V

ON OFF 2.05V

ON ON 1.8

Where: VREF = 0.8V Typical

R4= 200 kΩfor the Evaluation board

R2is set by the parallel combination of R1, R2and R3.

VOUT VREF 1R2

-------+





MCP1601 Eval. Board User Guide

DS51315A-page 6 2003 Microchip Technology Inc.

1.3 TEST POINTS

1.3.1 /SHDN

The /SHDN or shutdown test point can be used to monitor the level of the shutdown pin

or as an input to the shutdown pin of the MCP1601 device. With switch U3, position 1

in the “off” position, a 1 MΩresistor will pull the pin low.

1.3.2 SYNC/PWM

The SYNC/PWM pin can be used to monitor the level of the SYNC/PWM pin or as an

input to the MCP1601 device. With switch U3, position 2 in the “off” position, a 1 MΩ

resistor will pull the pin low.

To synchronize to an external oscillator:

• With switch U3, position 2 in the off position, connect the external oscillator to the

SYNC/PWM test point.

1.3.3 AGND

The analog ground or AGND can be used as a quiet ground connection. When using the

external oscillator synchronization function, connect the return or ground of the external

oscillator to the AGND test point.

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