MCP16322
Evaluation Board
User’s Guide
2011 Microchip Technology Inc.
DS52030A
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and may be superseded by updates.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.
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Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 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: 978-1-61341-851-2
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.
DS52030A-page 2
2011 Microchip Technology Inc.
MCP16322 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 MCP16322 Short Overview ............................................................................ 9
1.3 What is the MCP16322 Evaluation Board? .................................................. 10
1.4 MCP16322 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.
DS52030A-page 3
MCP16322 Evaluation Board User’s Guide
DS52030A-page 4
2011 Microchip Technology Inc.
MCP16322 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 on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP16322 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 MCP16322 Evaluation Board. The manual
layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP16322
Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with the MCP16322 Evaluation Board and a description of the user’s
guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP16322 Evaluation Board.
• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP16322
Evaluation Board.
2011 Microchip Technology Inc.
DS52030A-page 5
MCP16322 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
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
DS52030A-page 6
Examples
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 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP16322 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
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 2011)
• Initial Release of this Document.
2011 Microchip Technology Inc.
DS52030A-page 7
MCP16322 Evaluation Board User’s Guide
NOTES:
DS52030A-page 8
2011 Microchip Technology Inc.
MCP16322 EVALUATION BOARD
USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP16322 Evaluation Board and covers the
following topics:
• MCP16322 Short Overview
• What is the MCP16322 Evaluation Board?
• MCP16322 Evaluation Board kit contents
1.2
MCP16322 SHORT OVERVIEW
The MCP16322 is a highly integrated, high-efficiency, fixed frequency, synchronous,
step-down DC-DC converter in a popular 16-pin 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 MCP16322 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 MCP16322 can supply 2A 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.
2011 Microchip Technology Inc.
DS52030A-page 9
MCP16322 Evaluation Board User’s Guide
Pgood
10k
CBOOST
22 nF
VIN
6.0V to 24V
CIN
2 x 10 μF
PG
VIN
1.3
10
MCP16322
EN
VOUT
3.0V @ 2A
SW
INJ
EN
COUT
2 x 22 μF
V
FBFB
SGND
FIGURE 1-1:
L1
4.7 μH
BOOST
PGND
10k
23.2k
Typical MCP16322 Buck Application.
WHAT IS THE MCP16322 EVALUATION BOARD?
The MCP16322 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 MCP16322 Evaluation Board over the entire range. The
MCP16322 Evaluation Board was designed using small surface-mount components to
show application size for a high-voltage buck design.
1.4
MCP16322 EVALUATION BOARD KIT CONTENTS
This MCP16322 Evaluation Board kit includes the following items:
• MCP16322 Evaluation Board, 102-00423
• Important Information Sheet
DS52030A-page 10
2011 Microchip Technology Inc.
MCP16322 EVALUATION
BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
2.1.1
MCP16322 Features
The MCP16322 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 MCP16322 include:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Up to 95% Typical Efficiency
Input Voltage Range: 6.0V to 24V
Output Voltage Range: .9V to 5V
1.5% Output Voltage Accuracy
Integrated High-Side N-Channel Switch: 180 mΩ
Integrated Low-Side N-Channel Switch: 120 mΩ
2A Output Current MCP16322
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: QFN-16
A high-performance peak-current mode control system is used to deliver a fast
response to sudden line and load changes.
2.1.2
MCP16322 Evaluation Board Features
The MCP16322 Evaluation Board is developed to demonstrate how the MCP16322
device operates as a Buck Topology over a wide input voltage and load range. Test
points are provided for input and output, allowing the MCP16322 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 2A maximum continuous output current is available over the entire VIN
range (6.0V to 24.0V), along with the entire adjustable output voltage range (0.9V to
5.0V).
A copper via, labeled Pgood, 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).
2011 Microchip Technology Inc.
DS52030A-page 11
MCP16322 Evaluation Board User’s Guide
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 Enable, connected to the enable input on the device can be
populated and used to turn the MCP16322 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.
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 MCP16322 Evaluation Board is fully assembled and tested to evaluate and
demonstrate the MCP16322 operational capabilities.
2.2.1
Power Input and Output Connection
2.2.1.1
POWERING THE MCP16322 EVALUATION BOARD
The MCP16322 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 startup; a resistive load
or constant resistance is recommended for startup evaluation. Connect the positive
voltage terminal of the load to the VOUT terminal on the MCP16322 Evaluation 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.
2.2.2
How the MCP16322 High-Side Drive Boost Circuit Operates
The MCP16322 integrates both high-side and low-side, low resistance N-Channel
MOSFETs. A high-side or floating supply is needed to drive the gate of the high-side
N-Channel MOSFET above the input voltage to turn it on. The evaluation board uses
the output voltage to charge the boost cap while the inductor current flows. Prior to
startup, there is no inductor current, so an internal pre-charge circuit charges the boost
cap up to a minimum threshold. Once charged, the N-Channel can be turned on,
ramping current into the inductor.
The worst case operating conditions for charging the boost capacitor occur at minimum
VIN and no load. At minimum VIN (6V), there is not enough headroom to pre-charge the
boost cap to a high value. At no load, the converter is operating at a minimum or very
low duty cycle, putting a small amount of current into the inductor. When the switch
turns off, the inductor current decays very quickly, resulting in a short time to recharge
the boost capacitor.
DS52030A-page 12
2011 Microchip Technology Inc.
MCP16322 EVALUATION BOARD
USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP16322
Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Copper Layer
Board – Bottom Copper Layer
2011 Microchip Technology Inc.
DS52030A-page 13
V in
2
GND
GND
1
C2
10u
2
DNP
GND
1
C3
10u
GND
DNP
Enable
V in
4
15
14
17
9
6
7
2
3
11
MC P16321/2
Sgnd
Pgnd
Pgnd
Pgnd (Pad)
EN
NC
NC
V in
V in
V in
U1
FB
PG
SW
SW
SW
SW
BO OST
1
5
8
DNP
Pgood
1
12
13
16
10
10k
R2
22n
C1
2
1
DNP
SW
V out
4.7uH
L1
DNP
IN J
2
GND
Rbot
10k
Rtop
23.2k
R1
10
1
2
DS52030A-page 14
C4
22u
V out
1
GND
C5
22u
DNP
GND
DNP
V out
GND
V out
A.2
2
DNP
V in
MCP16322 Evaluation Board User’s Guide
BOARD – SCHEMATIC
2011 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
A.4
BOARD – TOP COPPER
2011 Microchip Technology Inc.
DS52030A-page 15
MCP16322 Evaluation Board User’s Guide
A.5
BOARD – BOTTOM COPPER
DS52030A-page 16
2011 Microchip Technology Inc.
MCP16322 EVALUATION BOARD
USER’S GUIDE
Appendix B. Bill of Materials
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
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
XAL5030 4.7uH Shielded Power Inductor
Coilcraft
XAL5030-472MEB
1
PCB
MCP16322 6V to 24V VIN, 3.3V Printed
Circuit Board
Microchip Technology Inc. 104-00423
1
R1
RES 10.0 OHM 1/10W 1% 0603 SMD
Yageo
RC0603FR-0710RL
2
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
MCP16322 High Input Buck Converter
QFN16
Microchip Technology Inc. MCP16322
4
VIN, VOUT, PC TEST POINT COMPACT SMT
GND, GND
Note 1:
AVX Corporation
Part Number
1
Keystone
0603YC104KAT2A
5016
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 Microchip Technology Inc.
DS52030A-page 17
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
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Tel: 39-0331-742611
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DS52030A-page 18
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Tel: 81-45-471- 6166
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11/29/11
2011 Microchip Technology Inc.