MCP1601
Evaluation Board (Rev. 1)
User’s Guide
2004 Microchip Technology Inc.
DS51511A
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and may be superseded by updates.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
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AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, SEEVAL,
SmartSensor 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, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Migratable Memory, 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 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.
© 2004, 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.
DS51511A-page ii
2004 Microchip Technology Inc.
MCP1601 Evaluation Board
(Rev. 1) User Guide
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview ........................................................................................ 5
1.1
1.2
1.3
Introduction ............................................................................................... 5
What is the MCP1601 Evaluation Board (Rev. 1)? .................................. 6
What the MCP1601 Evaluation Board (Rev. 1) kit includes ..................... 6
Chapter 2. MCP1601 Evaluation Board (Rev. 1) .......................................................... 7
2.1
2.2
2.3
2.4
Introduction ............................................................................................... 7
Features ................................................................................................... 7
Getting Started ......................................................................................... 7
Test Points ................................................................................................ 9
Appendix A. Schematic and Layouts ........................................................................ 11
A.1
A.2
A.3
A.4
Introduction ............................................................................................. 11
Board Schematic ................................................................................... 12
Board - Top Layer ................................................................................. 13
Board - Bottom Layer ............................................................................ 14
Appendix B. Bill-Of-Materials (BOM) ......................................................................... 15
Worldwide Sales and Service .................................................................................... 16
2004 Microchip Technology Inc.
DS51511A-page iii
MCP1601 Evaluation Board (Rev. 1) User Guide
NOTES:
DS51511A-page iv
2004 Microchip Technology Inc.
MCP1601 Evaluation Board
(Rev. 1) 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
MCP1601 Evaluation Board (Rev. 1). 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 MCP1601 Evaluation Board (Rev. 1) 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 MCP1601
Evaluation Board (Rev. 1).
• Chapter 2: MCP1601 Evaluation Board (Rev. 1) – Includes instructions on how
to get started, as well as a description of the evaluation board.
• Appendix A: Schematic and Layouts – Shows the schematic and layout
diagrams for the MCP1601 Evaluation Board (Rev. 1).
• Appendix B: Bill-of-Materials – Lists the parts used to build the MCP1601
Evaluation Board (Rev. 1).
2004 Microchip Technology Inc.
DS51511A-page 1
MCP1601 Evaluation Board (Rev. 1) 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
This user's guide describes how to use MCP1601 Evaluation Board (Rev. 1). Other
useful documents are listed below and are available and recommended as
supplemental reference resources.
MCP1601 Data Sheet (DS21896)
This data sheet provides detailed information regarding the MCP1601 product family.
Application Note 793, “Power Management in Portable Applications:
Understanding the Buck Switchmode Power Converter”, (DS00793)
This application note outlines a design procedure for buck regulators.
DS51511A-page 2
2004 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 (FAQ), 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
2004 Microchip Technology Inc.
DS51511A-page 3
MCP1601 Evaluation Board (Rev. 1) User’s Guide
NOTES:
DS51511A-page 4
2004 Microchip Technology Inc.
MCP1601 Evaluation Board
(Rev. 1) User Guide
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP1601 Evaluation Board (Rev. 1) is designed to demonstrate the use of the
MCP1601 Synchronous Buck Regulator in a step-down, inductor-based DC/DC
converter application.
This document describes the capabilities of the MCP1601 Evaluation Board (Rev. 1)
and how to select the desired synchronous converter operating mode, and to program
the output voltage.
Note:
This users guide applies to the 102-00033 MCP1601 Evaluation Board
(Rev. 1). There is another version of the MCP1601 evaluation board that
uses a different component set and is supplied with a separate user’s
guide.
The MCP1601 Evaluation Board (Rev. 1) Schematic is shown is Figure 1-1.
FIGURE 1-1:
2004 Microchip Technology Inc.
MCP1601 Evaluation Board (Rev. 1) Block Diagram.
DS51511A-page 5
MCP1601 Evaluation Board (Rev. 1) User Guide
1.2
WHAT IS THE MCP1601 EVALUATION BOARD (REV. 1)?
The MCP1601 is a 500 mA synchronous buck regulator. Both the high-side buck
P-channel and the low-side N-channel switches are integrated within the device. The
integrated synchronous switch makes the MCP1601 very efficient, even when converting unregulated input voltages to low-voltage, fixed outputs. This evaluation board is
designed for a wide range of output voltages and currents. For specific applications,
smaller inductors, shielded inductors, tantalum capacitors and different output voltage
settings can improve the total DC/DC converter performance and cost.
1.3
WHAT THE MCP1601 EVALUATION BOARD (REV. 1) KIT INCLUDES
This MCP1601 Evaluation Board (Rev. 1) Kit includes:
• The MCP1601 Evaluation Board (Rev. 1) (102-00033)
• MCP1601 Evaluation Board (Rev. 1) User’s Guide (DS51511)
• MCP1601 Data Sheet (DS21762)
DS51511A-page 6
2004 Microchip Technology Inc.
MCP1601 Evaluation Board
(Rev. 1) User Guide
Chapter 2. MCP1601 Evaluation Board (Rev. 1)
2.1
INTRODUCTION
This chapter provides detailed information illustrating how to apply input power, connect load, select output voltage set points and select the operating mode for the
MCP1601 Evaluation Board (Rev. 1). Board test point descriptions are also provided.
2.2
FEATURES
The MCP1601 device can operate in three different modes of operation to optimize the
efficiency of the voltage conversion. The three operating modes are:
• Automatic switching from PFM mode to PWM mode, and back
• Synchronization to external oscillator
• Fixed-frequency forced PWM mode
The MCP1601 output voltage is adjustable and is set by two external divider resistors.
A two-position switch is used on the MCP1601 Evaluation Board (Rev. 1) to change the
resistance of the external divider and adjust the output voltage to four different settings.
These output voltage settings are: 1.8V, 2.05V, 2.45V and 3.28V.
2.3
GETTING STARTED
2.3.1
Applying Power to the Board
Two surface-mount test points are used to apply power to the MCP1601 Evaluation
Board (Rev. 1). For proper operation, the input voltage range is 2.7V < +VIN < +5.5V
for all operating conditions. The MCP1601 has an internal Undervoltage Lockout
(UVLO) that will prevent the board from operating when the input voltage is below the
specified 2.7V minimum.
1. Connect the positive side of the external power supply (+) to the +VIN test point.
2. Connect the negative side (GND) of the external power supply to the PGND test
point, located to the left of the +VIN test point.
2.3.2
Connecting a Load to the Board
To connect an external load to the board, the +VOUT and PGND test points are used.
1. Connect the positive side of the load to the +VOUT pin and the negative or ground
side of the load to the PGND test point, located to the right of the +VOUT test point.
The MCP1601 output is rated for 500 mA (maximum) continuous current. The
output is protected against over current and short circuit conditions.
2.3.3
Enabling the MCP1601 - Using Switch SW1, Position 1
Switch SW1, position 1 is used to determine the Shutdown mode for the MCP1601
device. With switch SW1, position 1 pushed to the right, the SHDN pin is pulled up and
the output of the MCP1601 device is enabled. When switch SW1, position 1 is to the
left, the MCP1601 device is in a low quiescent current Shutdown mode and the output
is disabled.
2004 Microchip Technology Inc.
DS51511A-page 7
MCP1601 Evaluation Board (Rev. 1) User Guide
2.3.4
Selecting the Operating Mode - Using Switch SW1, Position 2
The multi-function SYNC/PWM pin on the MCP1601 is used to set the operating mode
of the device. The three operating modes are:
• Automatic switching from PFM mode to PWM mode, and back
• Synchronization to external oscillator
• Fixed-frequency forced PWM mode
To select automatic PFM/PWM mode:
1. Slide switch SW1, position 2 to the left (or off) position. While operating in this
mode, the MCP1601 device will automatically select the most efficient operating
mode by approximating the load current internally.
To synchronize the MCP1601 switching frequency to an external oscillator:
1. Slide switch SW1, position 2 to the left. Connect the external oscillator to the
SYNC/PWM test point located below and to the right of switch SW1 and the AGND
test point. See the MCP1601 datasheet (DS21762) for external clock specifications. When synchronizing to an external oscillator, the MCP1601 will operate in
the Fixed-frequency mode at the same frequency as the external oscillator.
To select the Fixed-frequency mode that operates off of the 750 kHz internal oscillator:
1. Slide switch SW1, position 2 to the right (or on) position. This will tie the
SYNC/PWM pin high and force PWM operation from the internal oscillator,
making the MCP1601 device independent of external load conditions.
2.3.5
Selecting the MCP1601 output voltage
Switch SW2 is used to select the output voltage. Refer to Table 2-1 to choose one of
the pre-selected output voltages.
TABLE 2-1:
SWITCH SETTINGS FOR PRE-SELECTED OUTPUT VOLTAGES
SW2, Position 1
SW2, Position 2
VOUT
OFF
OFF
ON
ON
OFF
ON
OFF
ON
3.28V
2.45V
2.05V
1.8
The output voltage for the MCP1601 device is determined by using the following
equation.
EQUATION 2-1:
R 2
V OUT = V REF 1 + -------
R
4
Where:
VREF = 0.8V, typical
R4
= 200 kΩ for the evaluation board
R2 is set by the parallel combination of R1, R2 and R3
DS51511A-page 8
2004 Microchip Technology Inc.
MCP1601 Evaluation Board (Rev. 1) User Guide
2.4
TEST POINTS
2.4.1
Shutdown (SHDN)
The SHDN (or shutdown) test point can be used to either monitor the level of the
shutdown pin or as an input to the shutdown pin of the MCP1601 device. With switch
SW1, position 1 in the off position, a 1 MΩ resistor will pull the pin low.
2.4.2
SYNC/PWM
The SYNC/PWM pin can be used to either monitor the level of the SYNC/PWM pin or
as an input to the MCP1601 device. With switch SW1, position 2 in the off position, a
1 MΩ resistor will pull the pin low.
To synchronize to an external oscillator:
1. With switch SW1, position 2 in the off position, connect the external oscillator to
the SYNC/PWM test point.
2.4.3
Analog Ground (AGND)
The analog ground (or AGND) can be used as a quiet ground connection. When using
the external oscillator synchronization function, connect the return or ground of the
external oscillator to the AGND test point.
2004 Microchip Technology Inc.
DS51511A-page 9
MCP1601 Evaluation Board (Rev. 1) User Guide
NOTES:
DS51511A-page 10
2004 Microchip Technology Inc.
MCP1601 Evaluation Board
(Rev. 1) User Guide
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the schematic and board layout diagrams for the MCP1601
Evaluation Board (Rev. 1).
The MCP1601 Evaluation Board (Rev. 1) is constructed using one silk-screen layer and
two , 1 oz. metal wiring layers. The bottom metal wiring layer is a single ground plane
routed to partition the PGND high-current return pin from the small-signal AGND return
pin on the MCP1601 device.
Diagrams included in this appendix:
• Board Schematic
• Top Metal Layer
• Bottom Metal Layer
2004 Microchip Technology Inc.
DS51511A-page 11
MCP1601 Evaluation Board (Rev. 1) User Guide
BOARD SCHEMATIC
M
A.2
DS51511A-page 12
2004 Microchip Technology Inc.
A.3
BOARD - TOP LAYER
12
2004 Microchip Technology Inc.
DS51511A-page 13
MCP1601 Evaluation Board (Rev. 1) User Guide
A.4
BOARD - BOTTOM LAYER
12
DS51511A-page 14
2004 Microchip Technology Inc.
MCP1601 Evaluation Board
(Rev. 1) User Guide
Appendix B. Bill-Of-Materials (BOM)
TABLE B-1:
Qty
1
BILL-OF-MATERIALS
Reference
R1
Description
Resistor, 1.21 MΩ, 1/10W, 1%, 0603 SMD
Manufacturer
Part Number
Yageo America
9C06031A1214FKHFT
®
1
R2
Resistor, 634 kΩ, 1/16W, 1%, 0603 SMD
Panasonic - ECG
1
R3
Resistor, 619 kΩ, 1/16W, 1%, 0603 SMD
Panasonic - ECG
ERJ-3EKF6193V
1
R4
Resistor, 200 kΩ ,1/16W, 1%, 0603 SMD
Panasonic - ECG
ERJ-3EKF2003V
2
R5, R6
Resistor, 1.00 MΩ, 1/16W, 1%, 0603 SMD
Panasonic - ECG
ERJ-3EKF1004V
2
C1, C2
Capacitor, 10 µF, 6.3V, Ceramic, X5R 0805
Panasonic - ECG
ECJ-2FB0J106M
1
C3
Capacitor, CERAMIC 68 pF 50V,
0603 SMD
Panasonic - ECG
ECJ-1VC1H680J
1
L1
Inductor Power Shield, 10 µH, SMD
Coiltronics®
SD14-100
2
SW1, SW2
Switch Dip, 2pos, Half Pitch, SMT
2
PGND
Test Point Compact, SMT
Keystone
Electronics®
5016
1
AGND
Test Point Compact, SMT
Keystone
Electronics
5016
1
+VIN
Test Point Compact, SMT
Keystone
Electronics
5016
1
+VOUT
Test Point Compact, SMT
Keystone
Electronics
5016
1
SHDN
Test Point Compact, SMT
Keystone
Electronics
5016
1
SYNC/PWM
Test Point Compact, SMT
Keystone
Electronics
5016
4
1
Bumpons - Protective Products
U1
MCP1601 Buck Regulator
2004 Microchip Technology Inc.
C&K™.
ERJ-3EKF6343V
TDA02H0SK1
3M®
SJ5003-0
Microchip
Technology Inc
MCP1601I
DS51511A-page 15
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09/27/04
DS51511A-page 16
2004 Microchip Technology Inc.