MCP16301 High Voltage
Buck Converter
600 mA Demo Board
User’s Guide
2011 Microchip Technology Inc.
DS51978A
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and may be superseded by updates.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
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
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, 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: 978-1-61341-153-7
Microchip received ISO/TS-16949:2002 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.
DS51978A-page 2
2011 Microchip Technology Inc.
MCP16301 600 mA DEMO 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 MCP16301 Short Overview ............................................................................ 9
1.3 What is the MCP16301 600 mA Demo Board? ............................................ 10
1.4 MCP16301 600 mA Demo 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 Silk And Pads .......................................................................... 15
A.4 Board – Top Copper And Pads .................................................................... 15
A.5 Board – Bottom Copper ............................................................................... 16
Appendix B. Bill of Materials
Worldwide Sales and Service .................................................................................... 18
2011 Microchip Technology Inc.
DS51978A-page 3
MCP16301 600 mA DEMO BOARD USER’S GUIDE
NOTES:
DS51978A-page 4
2011 Microchip Technology Inc.
MCP16301 600 mA DEMO 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
MCP16301 600 mA Demo 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 MCP16301 600 mA Demo Board as a development tool to emulate and debug firmware on a target board. The manual layout is as
follows:
• Chapter 1. “Product Overview” – Important information about the MCP16301
600 mA Demo Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with MCP16301 600 mA Demo Board and a description of the user’s
guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP16301 600 mA Demo Board.
• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP16301
600 mA Demo Board.
2011 Microchip Technology Inc.
DS51978A-page 5
MCP16301 600 mA DEMO 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
DS51978A-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 MCP16301 600 mA Demo Board. Other useful
documents are listed below. The following Microchip documents are available and
recommended as supplemental reference resources.
MCP16301 Data Sheet – “High Voltage Input Integrated Switch Step-Down Regulator”
(DS25004)
MCP16301 300 mA D2PAK Demo Board User’s Guide (DS51983)
AN1385, Dynamic Analysis of the MCP16301 Switch Mode Power Converter Utilizing
the MCP16301 Design Analyzer (DS01385)
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 (May 2011)
Initial release of this document.
2011 Microchip Technology Inc.
DS51978A-page 7
MCP16301 600 mA DEMO BOARD USER’S GUIDE
NOTES:
DS51978A-page 8
2011 Microchip Technology Inc.
MCP16301 600 mA DEMO BOARD
USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP16301 600 mA Demo Board and covers
the following topics:
• MCP16301 Short Overview
• What is the MCP16301 600 mA Demo Board?
• MCP16301 600 mA Demo Board Kit Contents
1.2
MCP16301 SHORT OVERVIEW
The MCP16301 is a highly integrated, high-efficiency, fixed frequency, step-down
DC-DC converter in a popular 6-pin SOT23 package that operates from input voltage
sources up to 30V. Integrated features include a high-side switch, fixed-frequency
peak-current mode control, internal compensation, peak current limit and over-temperature protection. Minimal external components are necessary to develop a complete
step-down DC-DC converter power supply.
High converter efficiency is achieved by integrating the current limited, low resistance,
high-speed N-Channel MOSFET and associated drive circuitry. High switching frequency minimizes the size of external filtering components resulting in a small solution
size.
The MCP16301 can supply 600 mA of continuous current while regulating the output
voltage from 2.0V to 15V. 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.
1N4148
VIN
4.5V To 30V
Cboost L1
100 nF 15 µH
BOOST
SW
VIN
CIN
10 µF
VOUT
3.3V @ 600 mA
40V
SCHOTTKY
DIODE
EN
COUT
2 X10 µF
31.2 K
VFB
GND
FIGURE 1-1:
2011 Microchip Technology Inc.
10 K
Typical MCP16301 Step Down Application.
DS51978A-page 9
MCP16301 600 mA Demo Board User’s Guide
1.3
WHAT IS THE MCP16301 600 mA DEMO BOARD?
The MCP16301 600 mA Demo Board is designed to operate from a 4V to 30V input
and regulate the output to 3.3V while delivering 600 mA of load current. Test points for
input power and load are provided to demonstrate the capability of the demo board over
the entire range. The MCP16301 600 mA Demo Board was designed using small
surface-mount components to show application size for a high voltage 600 mA design.
1.4
MCP16301 600 mA DEMO BOARD KIT CONTENTS
This MCP16301 600 mA Demo Board kit includes the following items:
• MCP16301 600 mA Demo Board, 102-00352
• Important Information Sheet
DS51978A-page 10
2011 Microchip Technology Inc.
MCP16301 600 mA DEMO BOARD
USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
2.1.1
MCP16301 Features
The MCP16301 device has been developed to provide high input voltage applications
with a precise low voltage regulated rail while operating at high efficiency.
The key features of the MCP16301 include:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Up to 96% Typical Efficiency
Input Voltage Range: 4.0V to 30V
Output Voltage Range: 2.0V to 15V
2% Output Voltage Accuracy
Integrated N-Channel Buck Switch: 460 m
600 mA Output Current
500 kHz 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): 3.5V
Overtemperature Protection
Available Package: SOT23 - 6
A high performance peak-current mode control system is used to deliver fast response
to sudden line and load changes.
2.1.2
MCP16301 600 mA Demo Board Features
The MCP16301 600 mA Demo Board is developed to demonstrate how the MCP16301
device operates over a wide input voltage and load range. Test points are provided for
input and output, allowing the demo board to be connected directly to a system.
A copper via connected to the EN input can be used to turn the MCP16301 on and off
– turning the device on (EN > 1.4V) when the undervoltage lockout threshold is met
(VIN > 3.5V), will enable the device.
2011 Microchip Technology Inc.
DS51978A-page 11
MCP16301 600 mA Demo Board User’s Guide
2.2
GETTING STARTED
The MCP16301 600 mA Demo Board is fully assembled and tested to evaluate and
demonstrate the MCP16301.
2.2.1
Power Input and Output Connection
2.2.1.1
POWERING THE MCP16301 600 mA DEMO BOARD
The MCP16301 600 mA Demo 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 30V. 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 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, follow the next steps:
1. Apply input voltage.
2. An internal pull up resistor is connected from VIN to the EN input of the
MCP16301, once the input voltage is greater than 3.5V the device will begin to
switch. Apply greater than 4V to the input for proper operation, a minimum load
is required to regulate the output to 3.3V. Detailed information is provided in the
MCP16301 data sheet (DS25004) for minimum load requirements for light load
conditions.
3. The measured output voltage should be 3.3V typical, adjusting the input voltage
and load should not cause the output to vary more than a few mV over the operating range of the converter.
2.2.2
How the MCP16301 High Side Drive Boost Circuit Operates
The MCP16301 integrates a low resistance N-Channel MOSFET. A high side or
floating supply is needed to drive the gate of the N-Channel MOSFET above the input
voltage to turn it on. The demo board uses the output voltage, 3.3V, to charge the boost
cap while inductor current flows clamping the SW node to a diode drop below ground.
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 (4V), there is not enough head room 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.
DS51978A-page 12
2011 Microchip Technology Inc.
MCP16301 600 mA DEMO BOARD
USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP16301 600
mA Demo Board:
•
•
•
•
Board – Schematic
Board – Top Silk And Pads
Board – Top Copper And Pads
Board – Bottom Copper
2011 Microchip Technology Inc.
DS51978A-page 13
MCP16301 600 mA DEMO BOARD USER’S GUIDE
BOARD – SCHEMATIC
2
DS51978A-page 14
1
A.2
2011 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP SILK AND PADS
A.4
BOARD – TOP COPPER AND PADS
2011 Microchip Technology Inc.
DS51978A-page 15
MCP16301 600 mA DEMO BOARD USER’S GUIDE
A.5
BOARD – BOTTOM COPPER
DS51978A-page 16
2011 Microchip Technology Inc.
MCP16301 600 mA DEMO BOARD
USER’S GUIDE
Appendix B. Bill of Materials
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
4
BUMP
BUMPON Square 0.40” x 0.1” Black
3M™
SJ-5007 (Black)
2
C1, C2
CAP 4.7uF 50V CERAMIC X7R 1210 10%
Taiyo Yuden®
UMK325B7475KM-T
2
C3, C4
CAP 10uF 6.3V CERAMIC X7R 0805 10%
Taiyo Yuden
JMK212B7106KG-T
1
C5
CAP 0.1uF 16V CERAMIC X7R 0603 10%
AVX Corporation
0603YC104KAT2A
®
B140-13-F
1
D1
DIODE SCHOTTKY 40V 1A SMA
Diodes Incorporated
1
D2
DIODE SWITCH 75V 200 mW SOD-323
Diodes Incorporated
1N4448WS-7-F
1
L1
MSS6132 15 µH Shielded Power Inductor
Coilcraft®
MSS6132-153ML
1
PCB
MCP16301 4V to 30V VIN, 3.3V 600 mA IOUT Microchip Technology Inc.
Printed Circuit Board
1
R1
RES 1.00M OHM 1/8W 1% 0805 SMD
Panasonic® ECG
ERJ-6ENF1004V
1
R2
RES 10 OHM 1/8W 1% 0805 SMD
Panasonic ECG
ERJ-6ENF10R0V
1
R3
RES 31.6K OHM 1/8W 1% 0805 SMD
Panasonic ECG
ERJ-6ENF3162V
1
R4
RES 10.0K OHM 1/8W 1% 0805 SMD
Panasonic ECG
ERJ-6ENF1002V
1
U1
MCP16301 High Input Voltage Buck
Converter SOT23
Microchip Technology Inc.
MCP16301
4
VIN,
VOUT,
GND,
GND
PC TEST POINT TIN SMD
Harwin
S1751-46R
Note 1:
104-00352
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.
DS51978A-page 17
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://www.microchip.com/
support
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-3090-4444
Fax: 91-80-3090-4123
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Cleveland
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8569-7000
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hangzhou
Tel: 86-571-2819-3180
Fax: 86-571-2819-3189
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Taiwan - Hsin Chu
Tel: 886-3-6578-300
Fax: 886-3-6578-370
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Kaohsiung
Tel: 886-7-213-7830
Fax: 886-7-330-9305
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
DS51978A-page 18
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
05/02/11
2011 Microchip Technology Inc.