MCP1603
Buck Converter
Evaluation Board
User’s Guide
© 2007 Microchip Technology Inc.
DS51652A
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DS51652A-page ii
© 2007 Microchip Technology Inc.
MCP1603 BUCK CONVERTER
EVALUATION BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Introduction............................................................................................................ 1
Document Layout .................................................................................................. 1
Conventions Used in this Guide ............................................................................ 2
Recommended Reading........................................................................................ 2
The Microchip Web Site ........................................................................................ 3
Customer Support ................................................................................................. 3
Document Revision History ................................................................................... 3
Chapter 1. Product Overview ....................................................................................... 5
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP1603 Buck Converter Evaluation Board? ............................ 6
1.3 What the MCP1603 Buck Converter Evaluation Board Kit includes .............. 6
Chapter 2. Installation and Operation ......................................................................... 7
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 7
Appendix A. Schematic and Layouts ........................................................................... 9
A.1 Introduction .................................................................................................... 9
A.2 Board - Schematic ....................................................................................... 10
A.3 Board - Top Silk Layer ................................................................................. 11
A.4 Board - Top Metal Layer .............................................................................. 12
A.5 Board - Bottom Metal Layer ......................................................................... 13
Appendix B. Bill Of Materials (BOM) .......................................................................... 15
Worldwide Sales and Service .................................................................................... 16
© 2007 Microchip Technology Inc.
DS51652A-page iii
MCP1603 Buck Converter Evaluation Board User’s Guide
NOTES:
DS51652A-page iv
© 2007 Microchip Technology Inc.
MCP1603 BUCK CONVERTER
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
MCP1603 Buck Converter 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 MCP1603 Buck Converter Evaluation Board
as a development tool to evaluate the MCP1603. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1603
Buck Converter Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this user’s guide and a description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP1603 Buck Converter Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP1603 Buck Converter Evaluation Board.
© 2007 Microchip Technology Inc.
DS51652A-page 1
MCP1603 Buck Converter Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
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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
#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}
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 code supplied by
user
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
RECOMMENDED READING
This user's guide describes how to use MCP1603 Buck Converter Evaluation Board.
Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources.
MCP1603 Data Sheet, "2.0 MHz, 500 mA Synchronous Buck Regulator"
(DS22042)
This data sheet provides detailed information regarding the MCP1603 Buck Regulator
product.
DS51652A-page 2
© 2007 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
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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
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 2007)
• Initial Release of this Document.
© 2007 Microchip Technology Inc.
DS51652A-page 3
MCP1603 Buck Converter Evaluation Board User’s Guide
NOTES:
DS51652A-page 4
© 2007 Microchip Technology Inc.
MCP1603 BUCK CONVERTER
EVALUATION BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
Step-down converter choices include a variety of linear and switching regulators. The
MCP1603 500 mA synchronous buck regulator provides a low profile, cost effective,
and efficient solution for devices like cellular telephones, USB-powered devices and
hand held instruments. The device provides a solution with minimal board space
because of the high-frequency operation, which reduces the size requirements of the
external inductor and capacitor and the 1 mm maximum height TSOT package.
The MCP1603 switches at a fixed frequency of 2.0 MHz when operating at a heavy
load. This provides a low-noise, small size solution. When operating at light loads, the
MCP1603 changes operation to a pulse frequency modulation (PFM) mode to minimize
quiescent current drawn from the input source. No intervention is necessary for smooth
transition from one mode to another.
This chapter covers the following topics.
• "What is the MCP1603 Buck Converter Evaluation Board?”
• "What the MCP1603 Buck Converter Evaluation Board Kit includes.”
Input
Voltage
2.7V - 5.5V
VOUT
500 mA
(maximum)
MCP1603
Buck
Regulator
VOUT
Setting
Switches
FIGURE 1-1:
© 2007 Microchip Technology Inc.
MCP1603 Buck Converter Evaluation Board Block Diagram.
DS51652A-page 5
MCP1603 Buck Converter Evaluation Board User’s Guide
1.2
WHAT IS THE MCP1603 BUCK CONVERTER EVALUATION BOARD?
The MCP1603 Buck Converter Evaluation Board demonstrates the use of Microchip’s
MCP1603 device in a step-down application. The evaluation board is a fully functional
platform to evaluate the MCP1603 buck regulator over the input voltage, output voltage
and current range of the device.
Test points are provided to allow easy connection of the input voltage source and the
output load.
1.3
WHAT THE MCP1603 BUCK CONVERTER EVALUATION BOARD KIT
INCLUDES
This MCP1603 Buck Converter Evaluation Board kit includes:
• MCP1603 Buck Converter Evaluation Board (102-00133)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
- MCP1603 Buck Converter Evaluation Board User’s Guide (DS51652)
DS51652A-page 6
© 2007 Microchip Technology Inc.
MCP1603 BUCK CONVERTER
EVALUATION BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1603 Buck Converter Evaluation Board is designed to demonstrate
Microchip’s MCP1603 in an adjustable output voltage configuration. The MCP1603 is
a 500 mA synchronous buck regulator that features both Pulse Frequency Modulation
(PFM) and Pulse Width Modulation (PWM). The PFM mode is used at light loads to
improve system efficiency while the 2.0 MHz PWM mode is entered at heavy loads.
The transition between PFM and PWM modes automatically occurs without any
external intervention. The MCP1603 is available in both adjustable parts that require
an external divider to set the output voltage and fixed output voltage parts.
The high switching speed and TSOT package (1 mm maximum height) make the
MCP1603 ideal for space constrained applications that require an efficient stepped
down voltage.
2.2
FEATURES
The MCP1603 Buck Converter Evaluation Board has the following features:
•
•
•
•
2.3
Compact size and low profile 500 mA converter design.
Wide Input voltage range from 2.7V to 5.5V.
Five different output voltage settings: 0.8V, 1.2V, 1.8V, 2.5V, and 3.3V.
Test points for connecting input voltage source and external load.
GETTING STARTED
The MCP1603 Buck Converter Evaluation Board is fully assembled and tested for
evaluating the MCP1603 device. The board requires the use of an external input
voltage source of 2.7V to 5.5V and an external load capable of 500 mA.
2.3.1
Power Input and Output Connection
2.3.1.1
POWERING THE MCP1603 BUCK CONVERTER EVALUATION BOARD
1. Connect the positive side of the input source (+) to TP1 (VIN).
2. Connect the negative or return side (-) of input source to TP2 (GND). Refer to
Figure 2-1. The input voltage should be limited from 2.7V to 5.5V range.
© 2007 Microchip Technology Inc.
DS51652A-page 7
MCP1603 Buck Converter Evaluation Board User’s Guide
FIGURE 2-1:
2.3.1.2
Setup Configuration Diagram.
APPLYING LOAD TO MCP1603 BUCK CONVERTER EVALUATION
BOARD
1. Connect the positive side of the load (+) to TP3 (VOUT).
2. Connect the negative side of the load (-) to TP4 (GND). Refer to Figure 2-1. The
maximum load current should not exceed 500 mA.
As an alternative, a resistor can be connected between TP3 and TP4. The value of this
resistor must be sized such that the maximum load current does not exceed 500 mA
for the selected output voltage.
2.3.1.3
SETTING THE OUTPUT VOLTAGE ON THE MCP1603 BUCK
CONVERTER EVALUATION BOARD
The output voltage of the MCP1603 Buck Converter Evaluation Board is set by the
position of switch S1 locations. Table 2-1 shows the position of the four S1 switch
locations to achieve the five different standard output voltages.
TABLE 2-1:
SETTING THE OUTPUT VOLTAGE
Output Voltage
S1 - POS1
S1 - POS2
S1 - POS3
S1 - POS4
0.8V
Off
Off
Off
Off
1.2V
Off
Off
Off
On
1.8V
Off
Off
On
Off
2.5V
Off
On
Off
Off
3.3V
On
Off
Off
Off
Evaluating the Application
The best way to evaluate the MCP1603 Buck Converter Evaluation Board is to dig into
the circuit. Measure voltages and currents with a DVM and probe the board with an
oscilloscope.
DS51652A-page 8
© 2007 Microchip Technology Inc.
MCP1603 BUCK CONVERTER
EVALUATION BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP1603 Buck
Converter Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Silk Layer
Board – Top Metal Layer
Board – Bottom Metal Layer
© 2007 Microchip Technology Inc.
DS51652A-page 9
MCP1603 Buck Converter Evaluation Board User’s Guide
BOARD - SCHEMATIC
M
A.2
DS51652A-page 10
© 2007 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD - TOP SILK LAYER
© 2007 Microchip Technology Inc.
DS51652A-page 11
MCP1603 Buck Converter Evaluation Board User’s Guide
A.4
BOARD - TOP METAL LAYER
DS51652A-page 12
© 2007 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD - BOTTOM METAL LAYER
© 2007 Microchip Technology Inc.
DS51652A-page 13
MCP1603 Buck Converter Evaluation Board User’s Guide
NOTES:
DS51652A-page 14
© 2007 Microchip Technology Inc.
MCP1603 BUCK CONVERTER
EVALUATION BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Panasonic®
Part Number
2
C1, C2
Cap Ceramic 4.7µF 6.3V X5R 0603
1
C3
Cap Ceramic 33 pF 50V 0603
Panasonic - ECG
ECJ-1VC1H330J
1
L1
4.7 µH Inductor
Coiltronics
SD3812-4R7-R
1
R1
Res 200 kΩ 1/10W 1% 0603
Panasonic - ECG
ERJ-3EKF2003V
1
R2
Res 402 kΩ 1/10W 1% 0603
Panasonic - ECG
ERJ-3EKF4023V
1
R3
Res 160 kΩ 1/10W 5% 0603
Panasonic - ECG
ERJ-3GEYJ164V
1
R4
Res 499 kΩ 1/10W 1% 0603
Panasonic - ECG
ERJ-3EKF4993V
1
R5
Res 63.4 kΩ 1/10W 1% 0603
Panasonic - ECG
ERJ-3EKF6342V
1
R6
Res 93.1 kΩ 1/10W 1% 0603
Panasonic - ECG
ERJ-3EKF9312V
1
R7
Res 4.99 kΩ 1/10W 1% 0603
Panasonic - ECG
ERJ-3EKF4991V
1
S1
Switch DIP SPST Sealed 4POS SMD
ITT Industries / C&K Div
SD04H1SK
4
TP1, TP2, TP3,
TP4
PC Test Point Compact SMD
Keystone Electronics®
5016
1
U1
500 mA Synchronous Buck Regulator Microchip Technology Inc. MCP1603L-ADJI/OS
Note 1:
- ECG
ECJ-1VB0J475K
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.
© 2007 Microchip Technology Inc.
DS51652A-page 15
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12/08/06
DS51652A-page 16
© 2007 Microchip Technology Inc.