MCP16321
Evaluation Board
User’s Guide
2011-2013 Microchip Technology Inc.
DS52024B
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and may be superseded by updates.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
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
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OTHERWISE, RELATED TO THE INFORMATION,
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Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash
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,
MTP, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
Analog-for-the-Digital Age, Application Maestro, BodyCom,
chipKIT, chipKIT logo, CodeGuard, dsPICDEM,
dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O,
Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA
and Z-Scale 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.
GestIC and ULPP are registered trademarks of Microchip
Technology Germany II GmbH & Co. KG, a subsidiary of
Microchip Technology Inc., in other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2011-2013, Microchip Technology Incorporated, Printed in
the U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 9781620771587
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
== ISO/TS 16949 ==
DS52024B-page 2
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® MCUs and dsPIC® DSCs, KEELOQ® code hopping
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.
2011-2013 Microchip Technology Inc.
Object of Declaration: MCP16321 Evaluation Board User’s Guide
2011-2013 Microchip Technology Inc.
DS52024B-page 3
Digital Power Starter Kit User’s Guide
NOTES:
DS52024B-page 4
2011-2013 Microchip Technology Inc.
MCP16321 EVALUATION BOARD
USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 7
Introduction............................................................................................................ 7
Document Layout .................................................................................................. 7
Conventions Used in this Guide ............................................................................ 8
Recommended Reading........................................................................................ 9
The Microchip Web Site ........................................................................................ 9
Customer Support ................................................................................................. 9
Document Revision History ................................................................................... 9
Chapter 1. Product Overview
1.1 Introduction ................................................................................................... 11
1.2 MCP16321 Short Overview .......................................................................... 11
1.3 What Is the MCP16321 Evaluation Board? .................................................. 12
1.4 MCP16321 Evaluation Board Kit Contents .................................................. 12
Chapter 2. Installation and Operation
2.1 Introduction ................................................................................................... 13
2.2 Getting Started ............................................................................................. 14
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 15
A.2 Board – Schematic ....................................................................................... 16
A.3 Board – Top Layer ....................................................................................... 17
A.4 Board – Top Copper ................................................................................... 17
A.5 Board – Bottom Copper ............................................................................... 18
Appendix B. Bill of Materials
Worldwide Sales and Service .................................................................................... 20
2011-2013 Microchip Technology Inc.
DS52024B-page 5
MCP16321 Evaluation Board User’s Guide
NOTES:
DS52024B-page 6
2011-2013 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 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® IDE online help.
Select the Help menu, and then Topics to open a list of available online help files.
INTRODUCTION
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.
2011-2013 Microchip Technology Inc.
DS52024B-page 7
MCP16321 Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
Represents code supplied by
user
DS52024B-page 8
File>Save
Press <Enter>, <F1>
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
var_name [,
var_name...]
void main (void)
{ ...
}
2011-2013 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user’s guide describes how to use the MCP16321 Evaluation Board. Another
useful document is listed below. The following Microchip document is available and
recommended as a supplemental reference resource.
• 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
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 B (April 2013)
• Replaced A.5 “Board – Bottom Copper”.
• Changed C1 manufacturer number in Appendix B. “Bill of Materials”
• Other minor typographical corrections
Revision A (November 2011)
• Initial Release of this Document.
2011-2013 Microchip Technology Inc.
DS52024B-page 9
MCP16321 Evaluation Board User’s Guide
NOTES:
DS52024B-page 10
2011-2013 Microchip Technology Inc.
MCP16321 EVALUATION BOARD
USER’S GUIDE
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, VOUT overvoltage and overtemperature protection.
Minimal external components are necessary to develop a complete step-down DC-DC
converter power supply. The MCP16321 draws less than 10 µA while disabled.
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; VOUT
is set to 3.0V using an external resistor divider. The evaluation board was developed
to accommodate the MCP16321 fixed output voltage options.
2011-2013 Microchip Technology Inc.
DS52024B-page 11
MCP16321 Evaluation Board User’s Guide
PGOOD
10 kΩ
CBOOST
22 nF
VIN
6.0V to 24V
CIN
2 x 10 µF
PG
VIN
1.3
10Ω
MCP16321
EN
VOUT
3.0V @ 1A
SW
INJ
EN
COUT
2 x 22 µF
V
FB
FB
SGND
FIGURE 1-1:
L1
4.7 µH
BOOST
PGND
10 kΩ
23.2 kΩ
Typical MCP16321 Buck Application.
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 (ADM00414)
• Important Information Sheet
DS52024B-page 12
2011-2013 Microchip Technology Inc.
MCP16321 EVALUATION BOARD
USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
2.1.1
MCP16321 Features
The MCP16321 device was 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% VREF Accuracy
Fixed Output Voltage Options 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
2.0% VOUT Accuracy
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
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 VIN range,
(6.0V to 24.0V), along with the entire adjustable output range (0.9V to 5.0V).
2011-2013 Microchip Technology Inc.
DS52024B-page 13
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 VOUT with a 10 kΩ resistor (R2).The power good output pin
should not be pulled to a voltage higher than 6.0V.
A copper via, labeled INJ, connected between the 10Ω injection resistor (R1) and the
RTOP resistor can be populated to allow a convenient injection point for stability
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 undervoltage lockout threshold is met (VIN > 5.75V) will enable the device.
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.
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 VIN terminal and its return to the GND
terminal. 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 start-up; a resistive
load or constant resistance is recommended for start-up evaluation. Connect the
positive voltage terminal of the load to the VOUT terminal on the demo board and
connect the negative or return 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 3.0V typical. Adjusting the input voltage
and load should not cause the output to vary significantly over the operating
range of the converter.
DS52024B-page 14
2011-2013 Microchip Technology Inc.
MCP16321 EVALUATION BOARD
USER’S GUIDE
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
Board – Bottom Copper
2011-2013 Microchip Technology Inc.
DS52024B-page 15
VIN
2
C2
10u
GND
GND
1
2
DNP
GND
1
C3
10u
GND
DNP
Enable
4
15
14
17
9
6
7
2
3
11
SGND
MCP16321/2
PGND
PGND
PGND (Pad)
EN
NC
NC
VIN
VIN
VIN
U1
FB
1
DNP
PGOOD
1
12
13
16
10
5
PG 8
SW
SW
SW
SW
BOOST
2
10k
R2
22n
C1
DNP
SW
1
VOUT
4.7U
L1
DNP
INJ
2
GND
RBOT
10K
RTOP
36.5K
R1
10
1
2
DS52024B-page 16
GND
22U
C4
VOUT
1
22U
C5
DNP
GND
DNP
VOUT
GND
VOUT
A.2
2
DNP
VIN
MCP16321 Evaluation Board User’s Guide
BOARD – SCHEMATIC
2011-2013 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
A.4
BOARD – TOP COPPER
2011-2013 Microchip Technology Inc.
DS52024B-page 17
MCP16321 Evaluation Board User’s Guide
A.5
BOARD – BOTTOM COPPER
DS52024B-page 18
2011-2013 Microchip Technology Inc.
MCP16321 EVALUATION BOARD
USER’S GUIDE
Appendix B. Bill of Materials
TABLE B-1:
BILL OF MATERIALS (BOM)
Qty Reference
Description
Manufacturer
Part Number
1
C1
Cap. 22000pF 25V Ceramic X7R 0603 10%
AVX Corporation
06033C223KAT2A
2
C2, C3
Cap. 10uF 35V Ceramic X7R 1210 20%
Taiyo Yuden Co., LTD
GMK325AB7106MM-T
Electronics®
2
C4, C5
Cap.P 22uF 6.3V Ceramic X7R 1206 10%
Murata
1
L1
XFL4020 4.7uH Shielded Power Inductor
Coilcraft
XFL4020-472MEB
1
PCB
RoHS Compliant Bare PCB MCP16321
Evaluation Board
Microchip
Technology Inc.
104-00414
1
R1
Res. 10.0 Ohm 1/10W 1% 0603 SMD
Yageo Corporation
RC0603FR-0710RL
1
R2, RBOT
Res. 10.0K Ohm 1/10W 1% 0603 SMD
Yageo Corporation
RC0603FR-0710KL
1
RTOP
Res. 23.2K Ohm 1/10W 1% 0603 SMD
Yageo Corporation
RC0603FR-0723K2L
1
U1
MCP16321 High Input Buck Converter
QFN16
Microchip
Technology Inc.
MCP16321
4
VIN, VOUT, PC Test Point Compact SMT
GND, GND
Keystone
Electronics Corp.
5016
Note 1:
GCM31CR70J226KE23L
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.
2011-2013 Microchip Technology Inc.
DS52024B-page 19
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82-2-558-5934
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Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
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Tel: 63-2-634-9065
Fax: 63-2-634-9069
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Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
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Tel: 65-6334-8870
Fax: 65-6334-8850
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Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
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Tel: 886-3-5778-366
Fax: 886-3-5770-955
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Tel: 86-755-8864-2200
Fax: 86-755-8203-1760
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Tel: 886-7-213-7828
Fax: 886-7-330-9305
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Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2508-8600
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Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
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Fax: 66-2-694-1350
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Tel: 86-756-3210040
Fax: 86-756-3210049
DS52024B-page 20
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Fax: 39-0331-466781
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Tel: 81-3-6880- 3770
Fax: 81-3-6880-3771
11/29/12
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