MCP1612 Evaluation Board
User’s Guide
2005 Microchip Technology Inc.
DS51529A
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and may be superseded by updates.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,
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RELATED TO THE INFORMATION, INCLUDING BUT NOT
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
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Analog-for-the-Digital Age, Application Maestro, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, MPASM, MPLIB, MPLINK,
MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail,
PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB,
rfPICDEM, Select Mode, Smart Serial, SmartTel and Total
Endurance are trademarks of Microchip Technology
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All other trademarks mentioned herein are property of their
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© 2005, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, 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.
DS51529A-page ii
2005 Microchip Technology Inc.
MCP1612 Evaluation Board
User’s Guide
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Installation and Operation .......................................................................... 5
1.1
1.2
1.3
1.4
Introduction ................................................................................................ 5
Evaluation Board Description .................................................................... 5
How it is used ............................................................................................ 6
How it works .............................................................................................. 7
Appendix A. Schematic and Board Layouts ............................................................... 9
A.1
A.2
A.3
A.4
A.5
A.6
Introduction ................................................................................................ 9
Schematic ................................................................................................ 10
Top Silk-Screen Layer ............................................................................. 11
Top Metal Layer....................................................................................... 12
Bottom Metal Layer ................................................................................. 13
Bottom Silk-Screen Layer (Top View) ..................................................... 14
Appendix B. Bill-of-Materials (BOM) ......................................................................... 15
B.1
Introduction .............................................................................................. 15
Worldwide Sales and Service ..................................................................................... 16
2005 Microchip Technology Inc.
DS51529A-page iii
MCP1612 Evaluation Board User’s Guide
NOTES:
DS51529A-page iv
2005 Microchip Technology Inc.
MCP1612 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
MCP1612 Evaluation Board. Items discussed in this chapter include:
•
•
•
•
About This Guide
Recommended Reading
The Microchip Web Site
Customer Support
ABOUT THIS GUIDE
Document Layout
This document describes how to use the MCP1612 Evaluation Board. The manual
layout is as follows:
• Chapter 1: Installation and Operation – Describes how to use the various
features of the MCP1612 Evaluation Board.
• Appendix A: Schematic and Layouts – Shows the schematic and Printed
Circuit Board (PCB) layout diagrams for the MCP1612 Evaluation Board.
• Appendix B: Bill-of-Materials – Shows the parts used to build the MCP1612
Evaluation Board.
2005 Microchip Technology Inc.
DS51529A-page 1
MCP1612 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
‘bnnnn
Text in angle brackets < >
Courier font:
Plain Courier
Italic Courier
0xnnnn
Square brackets [ ]
Curly brackets and pipe
character: { | }
Ellipses...
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 binary number where n is a
digit
A key on the keyboard
Click OK
Click the Power tab
‘b00100, ‘b10
File>Save
Press <Enter>, <F1>
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
A variable argument
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
file.o, where file can be
any valid filename
A hexadecimal number where 0xFFFF, 0x007A
n is a hexadecimal digit
Optional arguments
mcc18 [options] file
[options]
Choice of mutually exclusive errorlevel {0|1}
arguments; an OR selection
Replaces repeated text
var_name [,
var_name...]
Represents code supplied by void main (void)
user
{ ...
}
RECOMMENDED READING
The following Microchip documents are available and recommended as supplemental
reference resources.
MCP1612 Data Sheet, “Single 1A, 1.4 MHz Synchronous Buck Regulator“,
DS21921
The data sheet provides detailed information regarding the MCP1612 buck regulator.
DS51529A-page 2
2005 Microchip Technology Inc.
Preface
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
Development Systems Information Line
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
In addition, there is a Development Systems Information Line which lists the latest
versions of Microchip's development systems software products. This line also
provides information on how customers can receive currently available upgrade kits.
The Development Systems Information Line numbers are:
1-800-755-2345 – United States and most of Canada
1-480-792-7302 – Other International Locations
REVISION HISTORY
Revision A (January 2005)
• Initial Release of this Document.
2005 Microchip Technology Inc.
DS51529A-page 3
MCP1612 Evaluation Board User’s Guide
NOTES:
DS51529A-page 4
2005 Microchip Technology Inc.
MCP1612 Evaluation Board
User’s Guide
Chapter 1. Installation and Operation
1.1
INTRODUCTION
The MCP1612 is a 1A, 1.4 MHz, fully integrated buck regulator. The output voltage is
selectable from 0.8V to VIN by use of an external resistor divider. It is available in both
the 8L-MSOP and 8L-DFN packages.
The MCP1612 Evaluation Board contains two independent buck regulators featuring
the 8L-MSOP and the 8L-DFN packages. The output voltage is set to one of eight
different preset values (four per regulator circuit) by use of a two-position DIP switch.
Each regulator circuit can supply an output current of 0 to 1A.
1.2
EVALUATION BOARD DESCRIPTION
The MCP1612 Evaluation Board consists of two separate 0 to 1A buck regulator
circuits. One circuit (CKT1) features the 8L-MSOP package, while the other circuit
(CKT2) features the 8L-DFN package. Each circuit has four different preset output
voltage (VOUT) settings.
The settings for VOUT on CKT1 are 0.8V, 1.0V, 1.2V, and 1.4V. Refer to
Section 1.3.1 “CKT1 Operation” for an explanation detailing how to set VOUT. The
input voltage (VIN) of CKT1 can be 2.7V to 5.5V for any setting of VOUT.
The settings for VOUT on CKT2 are 0.8V, 1.7V, 2.4V, and 3.3V. Refer to
Section 1.3.2 “CKT2 Operation” for an explanation detailing how to set VOUT. Since
the MCP1612 is a buck regulator, VOUT has to be lower than VIN. Therefore, it is
recommended that VIN for CKT2 be greater than VOUT plus 500 mV to 5.5V to ensure
proper operation.
2005 Microchip Technology Inc.
DS51529A-page 5
MCP1612 Evaluation Board User’s Guide
1.3
HOW IT IS USED
1.3.1
CKT1 Operation
1. Connect the 2.7V to 5.5V lab power supply to the VIN (TP1) pin and the GND
(TP2) pin.
Note:
The MCP1612 will not operate until VIN is above the 2.7V threshold.
2. Connect an electronic or resistive load between VOUT (TP4) pin and GND (TP5)
pin.
Note:
The MCP1612 is specified to deliver 0 to 1A of load current. The internal
overcurrent limit is 2.3A. However, care should be taken not to exceed the
1A current rating of the part.
3. The values of VOUT are predetermined and are selectable by a two-position DIP
switch (S1). Table 1-1 lists the switch settings and VOUT.
TABLE 1-1:
S1 SWITCH SETTINGS AND VOUT
S1, Position 1
S1, Position 2
VOUT
Off
Off
0.8V
On
Off
1.0V
Off
On
1.2V
On
On
1.4V
4. With VIN applied, verify that VOUT agrees with the switching settings listed above.
5. A resistor pulls the shutdown (SHDN), pin up to VIN, making the circuit always
enabled. The circuit can be disabled by pulling the SHDN (TP3) pin to ground.
DS51529A-page 6
2005 Microchip Technology Inc.
Installation and Operation
1.3.2
CKT2 Operation
1. Connect the 2.7V to 5.5V power supply to the VIN (TP9) pin and the GND (TP10)
pin.
Note 1:
The MCP1612 will not operate until VIN is above the 2.7V threshold.
Since the MCP1612 is a buck regulator, VOUT has to be lower than VIN.
Therefore, it is recommended to ensure proper operation that VIN be
greater than VOUT plus 500 mV to 5.5V.
2:
2. Connect an electronic or resistive load between VOUT (TP7) pin and GND (TP6)
pin.
Note:
The MCP1612 is specified to deliver 0 to 1A of load current. The internal
overcurrent limit is 2.3A. However, care should be taken not to exceed the
1A current rating of the part.
3. The values of VOUT are predetermined and are selectable by a two-position DIP
switch (S2). Table 1-2 lists the switch settings and VOUT.
TABLE 1-2:
S2 SWITCH SETTING AND VOUT
S2, Position 1
S2, Position 2
VOUT
Off
Off
0.8V
On
Off
1.7V
Off
On
2.4V
On
On
3.3V
4. With VIN applied, verify that VOUT agrees with the switching settings listed above.
5. A resistor pulls the shutdown (SHDN) pin up to VIN, making the circuit always
enabled. The circuit can be disabled by pulling the SHDN (TP8) pin to ground.
1.4
HOW IT WORKS
1.4.1
MCP1612 Functions
The MCP1612 is a fixed 1.4 MHz synchronous buck regulator that has integrated
switching and synchronous MOSFETs. Other features integrated into the device
include shutdown control, soft start, undervoltage lockout, overcurrent and
overtemperature protection. The high switching frequency allows the use of a smaller
inductor and filter capacitors which ultimately lead to a space-saving design. The output voltage is set by a simple resistor divider network and compensation is accomplished by a series resistor capacitor to ground.
1.4.2
Power Topology and Output Regulation
The MCP1612 is a buck regulator with integrated switching and synchronous
MOSFETs. Under normal operation, current ramps up in the buck inductor when the
P-channel MOSFET is on. This current is sensed and compared to the output of the
error amplifier. The error amplifier output is the difference between the internal 0.8V
reference and the divided down VOUT. When the sensed inductor current ramps up to
the point that is equal to the amplifier error signal, the P-channel MOSFET is turned off
and the N-channel synchronous MOSFET is turned on until the beginning of the next
switching cycle.
2005 Microchip Technology Inc.
DS51529A-page 7
MCP1612 Evaluation Board User’s Guide
NOTES:
DS51529A-page 8
2005 Microchip Technology Inc.
MCP1612 Evaluation Board
User’s Guide
Appendix A. Schematic and Board Layouts
A.1
INTRODUCTION
This appendix contains the schematic and Printed Circuit Board (PCB) layout diagrams
for the MCP1612 Evaluation Board.
A.1.1
Highlights
The MCP1612 Evaluation Board is constructed using a two-layer PCB. The top and
bottom layers are for components and traces.
Diagrams included in this appendix:
•
•
•
•
•
Schematic
Top Silk-Screen Layer
Top Metal Layer
Bottom Metal Layer
Bottom Silk-Screen Layer
2005 Microchip Technology Inc.
DS51529A-page 9
MCP1612 Evaluation Board User’s Guide
A.2
SCHEMATIC
DS51529A-page 10
2005 Microchip Technology Inc.
Schematic and Board Layouts
A.3
TOP SILK-SCREEN LAYER
2005 Microchip Technology Inc.
DS51529A-page 11
MCP1612 Evaluation Board User’s Guide
A.4
TOP METAL LAYER
DS51529A-page 12
2005 Microchip Technology Inc.
Schematic and Board Layouts
A.5
BOTTOM METAL LAYER
2005 Microchip Technology Inc.
DS51529A-page 13
MCP1612 Evaluation Board User’s Guide
A.6
BOTTOM SILK-SCREEN LAYER (TOP VIEW)
DS51529A-page 14
2005 Microchip Technology Inc.
MCP1612 Evaluation Board
User’s Guide
Appendix B. Bill-of-Materials (BOM)
TABLE B-1:
Qty
BILL-OF-MATERIALS (BOM)
Reference
Description
Manufacture
Electronics®
Manufacture P/N
2
C2, C11
Capacitor, 0.1 µF, 0603
KEMET
2
C6, C8
Capacitor, 4.7 µF, 0805
Panasonic - ECG
ECJ-2FB1C475K
2
C1, C9
Capacitor, 10 µF, 0805
MuRata Electronics®
GRM21BR61A106KE19L
2
C3, C7
Capacitor, 560 pF, 0603
TDK Electronics Co., LTD C1608C0G1H561J
4
C4, C5, C10, C12,
C13, C14
Do Not Populate
–
–
2
L1, L2
3.3 µH Inductor
Coilcraft®
DO1608C-332
1
U2
MCP1612 DFN
Microchip
Technology Inc.
MCP1612-ADJI/MF
1
U1
MCP1612 MSOP
Microchip
Technology Inc.
MCP1612-ADJI/MS
2
R2, R8
Resistor, 10Ω, 0603
Yageo America
9C06031A10R0FKHFT
2
R3, R12
Resistor, 24.9 kΩ, 0603
Yageo America
9C06031A2492FKHFT
1
R10
Resistor, 86.6 kΩ, 0603
Yageo America
9C06031A8662FKHFT
1
R9
Resistor, 154 kΩ, 0603
Yageo America
9C06031A1543FKHFT
2
R6, R11
Resistor, 174 kΩ, 0603
Yageo America
9C06031A1743FKHFT
1
R5
Resistor, 348 kΩ, 0603
Yageo America
9C06031A3483FKHFT
2
R1, R7
Resistor, 500 kΩ, 0603
Yageo America
9C06031A5003FKHFT
1
R4
Resistor, 698 kΩ, 0603
Yageo America
9C06031A6983FKHFT
2
S1, S2
DIP Switch
ITT Industries, C&K Div.
TDA02H0SK1
10
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10
SMT Test Point
Keystone Electronics®
5016
2005 Microchip Technology Inc.
C0603C104J4RACTU
DS51529A-page 15
WORLDWIDE SALES AND SERVICE
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Fax: 905-673-6509
10/20/04
DS51529A-page 16
2005 Microchip Technology Inc.