Microchip Technology MCP16321 User guide

MCP16321 Evaluation Board

User’s Guide

 2011 Microchip Technology Inc. DS52024A

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

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
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Trademarks

The Microchip name and logo, the Microchip logo, dsPIC,
K

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

32

PIC

logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, chipKIT,
chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,
FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,
Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,
MPLINK, mTouch, Omniscient Code Generation, PICC,
PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,
rfLAB, Select Mode, Total Endurance, TSHARC,
UniWinDriver, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.

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.

© 2011, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.

Printed on recycled paper.

ISBN: 978-1-61341-850-5

Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.

®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

DS52024A-page 2  2011 Microchip Technology Inc.

MCP16321 EVALUATION BOARD

USER’S GUIDE

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 MCP16321 Short Overview ............................................................................ 9

1.3 What is the MCP16321 Evaluation Board? .................................................. 10

1.4 MCP16321 Evaluation Board Kit Contents .................................................. 10

Chapter 2. Installation and Operation

2.1 Introduction ................................................................................................... 11

2.2 Getting Started ............................................................................................. 12

Appendix A. Schematic and Layouts

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

A.2 Board – Schematic ....................................................................................... 14

A.3 Board – Top Layer ....................................................................................... 15

A.4 Board – Top Copper ................................................................................... 15

A.5 Board – Bottom Copper ............................................................................... 16

Appendix B. Bill of Materials

Worldwide Sales and Service ....................................................................................18

 2011 Microchip Technology Inc. DS52024A-page 3

MCP16321 Evaluation Board User’s Guide

NOTES:

DS52024A-page 4  2011 Microchip Technology Inc.

MCP16321 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 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 on-line help files.

INTRODUCTION

®

IDE on-line help.

This chapter contains general information that will be useful to know before using the
MCP16321 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 MCP16321 Evaluation Board. The manual
layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP16321

Evaluation Board.

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

started with the MCP16321 Evaluation Board and a description of the user’s
guide.

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

diagrams for the MCP16321 Evaluation Board.

• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP16321

Evaluation Board.

 2011 Microchip Technology Inc. DS52024A-page 5

MCP16321 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

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

®

IDE User’s Guide

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options]
errorlevel {0|1}

var_name...]
void main (void)

{ ...
}

DS52024A-page 6  2011 Microchip Technology Inc.

RECOMMENDED READING

This user's guide describes how to use MCP16321 Evaluation Board. Other useful doc­uments are listed below. The following Microchip documents are available and
recommended as supplemental reference resources.

• MCP16321/2 Data Sheet – “24V Input, 1A/2A Output, High Efficiency
Synchronous Buck Regulator with Power Good Indication” (DS22285)

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

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://support.microchip.com.

DOCUMENT REVISION HISTORY

Revision A (November 201 1)

• Initial Release of this Document.

 2011 Microchip Technology Inc. DS52024A-page 7

MCP16321 Evaluation Board User’s Guide

NOTES:

DS52024A-page 8  2011 Microchip Technology Inc.

MCP16321 EVALUATION BOARD

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP16321 Evaluation Board and covers the
following topics:

• MCP16321 Short Overview

• What is the MCP16321 Evaluation Board?

• MCP16321 Evaluation Board kit contents

1.2 MCP16321 SHORT OVERVIEW

The MCP16321 is a highly integrated, 1A output current capable, high-efficiency, fixed
frequency, synchronous, step-down DC-DC converter in a popular 3 mm x 3 mm
16-lead QFN package that operates from input voltage sources up to 24V. Integrated
features include a low resistance high-side switch, low resistance low-side switch,

1.0 Mhz fixed-frequency peak-current mode control, internal compensation, power

good output, peak current limit, V
Minimal external components are necessary to develop a complete step-down DC-DC
converter power supply. The MCP16321 draws less than 10

High converter efficiency is achieved by integrating the current limited, low resistance,
high-speed N-Channel MOSFETs and associated drive circuitry. Incorporating both the
upper and lower switches reduces the need for external components. High switching
frequency minimizes the size of external filtering components resulting in an overall
small solution size.

The MCP16321 can supply 1A of continuous current while regulating the output voltage
from 0.9V to 5V. An integrated high performance peak-current mode architecture keeps
the output voltage tightly regulated, even during input voltage steps and output current
transient conditions that are common in power systems.

The evaluation board is populated with the adjustable version of the MCP16321; V
is set to 3.0V using an external resistor divider. The evaluation board was developed
to accommodate the MCP16321 fixed output voltage options.

USER’S GUIDE

overvoltage and overtemperature protection.

OUT

µA while disabled.

OUT

 2011 Microchip Technology Inc. DS52024A-page 9

MCP16321 Evaluation Board User’s Guide

V

IN

6.0V to 24V

C

BOOST

22 nF

L1

4.7 μH

C

IN

2 x 10 μF

C

OUT

2 x 22 μF

V

OUT

3.0V @ 1A

10k

23.2k

10k

P

good

EN

10

INJ

V

FB

S

GND

P

GND

SWV

IN

EN

BOOST

MCP16321

PG

FB

FIGURE 1-1: Typical MCP16321 Buck Application.

1.3 WHAT IS THE MCP16321 EVALUATION BOARD?

The MCP16321 Evaluation Board is designed to operate from a 6V to 24V input and
regulate the output to 3.0V. Test points for input power and load are provided to dem­onstrate the capability of the MCP16321 Evaluation Board over the entire range. The
MCP16321 Evaluation Board was designed using small surface-mount components to
show application size for a high-voltage buck design. The board was designed to be
the evaluation platform for the MCP16321 product.

1.4 MCP16321 EVALUATION BOARD KIT CONTENTS

This MCP16321 Evaluation Board kit includes the following items:

• MCP16321 Evaluation Board, 102-00414

• Important Information Sheet

DS52024A-page 10  2011 Microchip Technology Inc.

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.1.1 MCP16321 Features

The MCP16321 devices have been developed to provide high input voltage, high
current applications with a precisely regulated rail while operating at high efficiency.

The key features of the MCP16321 include:

• Up to 95% Typical Efficiency for 5V Output Applications

• Input Voltage Range: 6.0V to 24V

• Output Voltage Range: 0.9V to 5V set using external resistor divider

•1.5% V

• Fixed Output Voltage Options 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V

•2.0% V

• Integrated High-Side N-Channel Switch: 180 mΩ

• Integrated Low-Side N-Channel Switch: 120 mΩ

• 1A Output Current MCP16321

• 1 MHz Fixed Frequency

• Adjustable Output Voltage

• Low Device Shutdown Current

• Peak Current Mode Control

• Internal Compensation

• Stable with Ceramic Capacitors

• Internal Soft-Start

• Cycle by Cycle Peak Current Limit

• Under Voltage Lockout (UVLO): 5.75V (typical)

• Output Overvoltage Protection

• Overtemperature Protection

• Available Package: 3 mm x 3 mm QFN-16 lead package

A high-performance peak-current mode control system is used to deliver a fast
response to sudden line and load changes

Accuracy

REF

Accuracy

OUT

MCP16321 EVALUATION BOARD

USER’S GUIDE

2.1.1.1 MCP16321 EVALUATION BOARD FEATURES

The MCP16321 Evaluation Board is developed to demonstrate how the MCP16321
buck regulator operates over a wide input voltage and load range. Test points are pro­vided for input and output voltage, allowing the MCP16321 Evaluation Board to be con­nected directly to a system. Test vias are also included to give the user easy access to
the switch, power good, enable and injection nodes for easy evaluation of the device.
There are also ancillary vias provided for attaching extra input and output connections.
The 1A maximum continuous output current is available over the entire V
(6.0V to 24.0V), along with the entire adjustable output range (0.9V to 5.0V).

 2011 Microchip Technology Inc. DS52024A-page 11

range,

IN

MCP16321 Evaluation Board User’s Guide

A copper via, labeled PGD, connected to the power good pin on the device, can be pop­ulated to monitor the power good output of the device. The power good pin is externally
pulled up to V
pulled to a voltage higher than 6.0V.

A copper via, labeled INJ, connected between the 10Ω injection resistor (R1) and the
R

resistor can be populated to allow a convenient injection point for stability

TOP

analysis.

A copper via, labeled EN, connected to the enable input on the device can be populated
and used to turn the MCP16321 on and off. Turning the device ON (Enable > 2.2V)
when the under-voltage lockout threshold is met (V
This pin must be pulled low (Enable < 0.8V) to disable the device. The EN input is inter­nally pulled high enabling the device. It is not necessary to pull the EN input high for
the device to operate and regulate output voltage. The Enable input pin should not be
driven to a voltage higher than 6.0V.

A copper via, labeled SW, connected to the switch node of the device can be populated
to analyze the switch node of the device.

2.2 GETTING STARTED

The MCP16321 Evaluation Board is fully assembled and tested to evaluate and dem­onstrate the MCP16321 operational capabilities.

with a 10 kΩ resistor (R2).The power good output pin should not be

OUT

> 5.75V), will enable the device.

IN

2.2.1 Power Input and Output Connection

2.2.1.1 POWERING THE MCP16321 EVALUATION BOARD

The MCP16321 Evaluation Board is fully assembled, tested and ready to begin evalu­ation. Apply positive input voltage to the V
The maximum input voltage should not exceed 24V. An electronic load or resistive load
can be used for evaluation, or the intended system load can be connected. Electronic
loads attempt to sink current at 0V during startup; a resistive load or constant resis­tance is recommended for startup evaluation. Connect the positive voltage terminal of
the load to the V

terminal on the demo board and connect the negative or return

OUT

side of the load to the GND terminal.

2.2.1.2 BOARD TESTING

To test the board:

1. Apply greater than 6V to the input for proper operation; no minimum load is
required to regulate the output to 3.0V.

2. The EN input is internally pulled up to a low voltage internal source enabling the
device. To disable the device, the EN input can be pulled below 0.8V.

3. The measured output voltage should be 3.0.V typical. Adjusting the input voltage
and load should not cause the output to vary significantly over the operating
range of the converter.

terminal and its return to the GND terminal.

IN

DS52024A-page 12  2011 Microchip Technology Inc.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP16321
Evaluation Board:

• Board – Schematic

• Board – Top Layer

• Board – Top Copper Layer

• Board – Bottom Copper Layer

MCP16321 EVALUATION BOARD

USER’S GUIDE

 2011 Microchip Technology Inc. DS52024A-page 13

MCP16321 Evaluation Board User’s Guide

SW

1

Vin2Vin

3

Sgnd

4

FB

5

NC6NC

7

PG

8

SW

16

Pgnd15Pgnd

14

SW13SW

12

Vin

11

BO OST

10

EN

9

Pgnd (Pad)

17

U1

MC P 16321/2

1 2

22n

C1

1 2

10u

C2

10

R1

10k

Rbot

36.5k

Rtop

GND

GND

GND

12

22u

C5

GND

GND

Vout

Vin

GND

Vout

Vout

10k

R2

Enable

Vin

GND

IN J

SW

Vout

GND

12

22u

C4

1 2

10u

C3

Pgood

1 2

4.7u

L1

DNP

DNP

DNP DNP

DNP

DNP

DNP

DNP

A.2 BOARD – SCHEMATIC

DS52024A-page 14  2011 Microchip Technology Inc.

A.3 BOARD – TOP LAYER

Schematic and Layouts

A.4 BOARD – TOP COPPER

 2011 Microchip Technology Inc. DS52024A-page 15

MCP16321 Evaluation Board User’s Guide

A.5 BOARD – BOTTOM COPPER

DS52024A-page 16  2011 Microchip Technology Inc.

MCP16321 EVALUATION BOARD

USER’S GUIDE

Appendix B. Bill of Mater ials

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

1 C1 CAP 22000pF 25V CERAMIC X7R 0603

10%

2 C2, C3 CAP 10uF 35V CERAMIC X7R 1210 20% Taiyo Yuden GMK325AB7106MM-T

2 C4, C5 CAP 22uF 6.3V CERAMIC X7R 1206 10% Murata GCM31CR70J226KE23L

1 L1 XFL4020 4.7uH Shielded Power Inductor Coilcraft XFL4020-472MEB

1 PCB MCP16321 6V to 24V VIN, 3.3V Printed

Circuit Board

1 R1 RES 10.0 OHM 1/10W 1% 0603 SMD Yageo RC0603FR-0710RL

1 R2, Rbot RES 10.0K OHM 1/10W 1% 0603 SMD Yageo RC0603FR-0710KL

1 Rtop RES 23.2K OHM 1/10W 1% 0603 SMD Yageo RC0603FR-0723K2L

1 U1 MCP16321 High Input Buck Converter

QFN16

4 VIN, VOUT,

GND, GND

Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The

PC TEST POINT COMPACT SMT Keystone 5016

released BOM used in manufacturing uses all RoHS-compliant components.

AVX Corporation 0603YC104KAT2A

Microchip Technology
Inc.

Microchip Technology
Inc.

104-00414

MCP16321

 2011 Microchip Technology Inc. DS52024A-page 17

Worldwide Sales and Service

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DS52024A-page 18  2011 Microchip Technology Inc.