MCP1603
Tiny Reference Design
© 2008 Microchip Technology Inc.
DS51750A
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
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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.
•
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© 2008, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
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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.
DS51750A-page ii
© 2008 Microchip Technology Inc.
MCP1603 TINY
REFERENCE DESIGN
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP1603 Tiny Reference Design Board? .................................. 6
1.3 What the MCP1603 Tiny Reference Design Board Kit Includes? .................. 6
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 7
2.3.1 Power Input and Output Connection ........................................................... 7
Appendix A. Schematics and Layouts
A.1 Introduction and Highlights ............................................................................ 9
A.2 Board - Schematic ....................................................................................... 10
A.3 Board - Top Pads and Silk-Screen .............................................................. 11
A.4 Board - Top Pads and Trace ........................................................................ 11
A.5 Board - Bottom Trace ................................................................................... 11
Appendix B. Bill of Materials (BOM)
Worldwide Sales and Service .................................................................................... 14
© 2008 Microchip Technology Inc.
DS51750A-page iii
MCP1603 Tiny Reference Design
DS51750A-page iv
© 2008 Microchip Technology Inc.
MCP1603 TINY
REFERENCE DESIGN
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 Tiny Reference Design. 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 Tiny Reference Design 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 MCP1603
Tiny Reference Design
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this reference design board and a description of the reference design
board operation.
• Appendix A. “Schematics and Layouts” – Shows the schematic and layout
diagrams for the MCP1603 Tiny Reference Design.
• Appendix B. “Bill of Materials (BOM)” - Lists the parts used to build the
MCP1603 Tiny Reference Design.
© 2008 Microchip Technology Inc.
DS51750A-page 1
MCP1603 Tiny Reference Design
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
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
#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
DS51750A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2008 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP1603 Tiny Reference Design. Other useful
documents are listed below. The following Microchip document is available and
recommended as supplemental reference resources:
• MCP1603 Data Sheet, “2.0 MHz, 500 mA Synchronous Buck Regulator”,
DS22042
• AN793 - “Power Management in Portable Applications: Understanding the
Buck Switchmode Power Converter”, DS00793
• MCP1603 Buck Converter Evaluation Board User's Guide, DS51652
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 (October 2008)
• Initial Release of this Document.
© 2008 Microchip Technology Inc.
DS51750A-page 3
MCP1603 Tiny Reference Design
NOTES:
DS51750A-page 4
© 2008 Microchip Technology Inc.
MCP1603 TINY
REFERENCE DESIGN
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 automatically 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 Tiny Reference Design?
• What the MCP1603 Tiny Reference Design Kit includes?
Input
Voltage
2.7V - 5.5V
FIGURE 1-1:
© 2008 Microchip Technology Inc.
MCP1603
Buck
Regulator
±VOUT
500 mA
(maximum)
MCP1603 Tiny Reference Design Block Diagram.
DS51750A-page 5
MCP1603 Tiny Reference Design
1.2
WHAT IS THE MCP1603 TINY REFERENCE DESIGN BOARD?
The MCP1603 Tiny Reference Design 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. The evaluation board is designed to show off one of the
main advantages of MCP1603 - its small size.
Test points are provided to allow easy connection of the input voltage source and the
output load.
FIGURE 1-2:
1.3
MCP1603 Tiny Reference Design Board Size.
WHAT THE MCP1603 TINY REFERENCE DESIGN BOARD KIT INCLUDES?
This MCP1603 Tiny Reference Design kit includes:
• Three separate MCP1603 Tiny Reference Design boards with the following output
voltage options:
- Fixed 3.3V using the MCP1603T-330I/OS
- Fixed 1.8V using the MCP1603T-180I/OS
- Fixed 1.2V using the MCP1603T-120I/OS
• Analog and Interface Products Demonstration Boards CD-ROM
- MCP1603 Tiny Reference Design (DS51750)
DS51750A-page 6
© 2008 Microchip Technology Inc.
MCP1603 TINY
REFERENCE DESIGN
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1603 Tiny Reference Design is designed to demonstrate Microchip's
MCP1603 in a fixed output voltage configuration. The board is designed to
demonstrate how to generate both positive and negative rails using the MCP1603. 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 Tiny Reference Design has the following features:
• Ultra compact size and low profile 500 mA converter design
• Wide Input voltage range from 2.7V to 5.5V
• Fixed output voltages: 3.3V, 1.2V, 1.8V as well as -1.2V and -1.8V (from 3.3V
supply)
• Test points for connecting input voltage source and external load
2.3
GETTING STARTED
The MCP1603 Tiny Reference Design 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
Powering the MCP1603 Tiny Reference Design (Positive Output Voltage
Configuration)
1. Connect the positive side of the input source (+) to VIN.
2. Connect the negative or return side (-) of input source to GND. Refer to
Figure 2-1. The input voltage must be within the range of 2.7V to 5.5V.
© 2008 Microchip Technology Inc.
DS51750A-page 7
MCP1603 Tiny Reference Design
2.7V - 5.5V
+
VOUT
–
FIGURE 2-1:
Positive Output Voltage Setup Configuration Diagram.
Powering the MCP1603 Tiny Reference Design (Negative Output
Configuration
1. Connect the positive side of the input source (+) to VIN.
2. Connect the negative or return side (-) of input source to VOUT. Refer to
Figure 2-2. In this configuration the output voltage will appear between the VOUT
terminal and GND terminal of the board.
Note:
For negative voltage generation the following condition must be met:
VIN-VOUT < 5.5V. For example, if generating -1.2V output,
VIN-(-1.2V) < 5.5V, therefore, VIN < 4.3V.
The MCP1603 device will be able to provide full load current in this configuration.
VIN
_
VOUT
(Negative)
+
FIGURE 2-2:
Negative Output Voltage Setup Configuration Diagram.
Applying Load to MCP1603 Tiny Reference Design Board (Positive
Output Configuration)
1. Connect the positive side of the load (+) to VOUT.
2. Connect the negative side of the load (-) to GND. Refer to Figure 2-1 and
Figure 2-2. The maximum load current should not exceed 500 mA.
As an alternative, a resistor can be connected between GND and VOUT. The value of
this resistor must be sized such that the maximum load current does not exceed
500 mA for the selected output voltage.
DS51750A-page 8
© 2008 Microchip Technology Inc.
MCP1603 TINY
REFERENCE DESIGN
Appendix A. Schematics and Layouts
A.1
INTRODUCTION AND HIGHLIGHTS
This appendix contains the following schematics and layouts for the MCP1603 Tiny
Reference Design:
•
•
•
•
Board - Schematic
Board - Top Silk Layer
Board - Top Metal Layer
Board - Bottom Metal Layer
© 2008 Microchip Technology Inc.
DS51750A-page 9
DS51750A-page 10
A
B
1
Gnd
TP2
Vin
TP1
AGND
1
2
3
MCP1603
Vin
Gnd
SHDN
U1
Vfb
Lx
4
6
4.7uH, 740mA
L1
3
2
3
AGND
C2
10uF, 6.3V (C)
Gnd
TP3
Vout
TP4
Author: Alex Irkliy
MCP1603.sch
MCP1603 Tiny Reference Design Board
AGND
C1
10uF, 6.3V (C)
2
4
Rev 1.0
4
A
B
C
D
A.2
C
D
1
MCP1603 Tiny Reference Design
BOARD - SCHEMATIC
© 2008 Microchip Technology Inc.
Schematics and Layouts
A.3
BOARD - TOP PADS AND SILK-SCREEN
A.4
BOARD - TOP PADS AND TRACE
A.5
BOARD - BOTTOM TRACE
© 2008 Microchip Technology Inc.
DS51750A-page 11
MCP1603 Tiny Reference Design
NOTES:
DS51750A-page 12
© 2008 Microchip Technology Inc.
MCP1603 TINY REFERENCE
DESIGN BOARD
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty
2
BILL OF MATERIALS (BOM)
Designator
C1, C2
Description
Manufacturer
Part Number
10uF, 6.3V, 0603 Ceramic Capacitor
Panasonic® - ECG
ECJ-1VB0J106M
TDK Corporation
VLF3012AT-4R7MR74
1
L1
4.7uH, 740mA Inductor
1
PCB
RoHS Compliant Bare PCB, MCP1603 Microchip Technology Inc.
Tiny Reference Design Board
104-00220
4
TP1, TP2,
TP3, TP4
PC Test Point Compact SMT
Keystone Electronics®
5016
1
U1
500 mA Synchronous Buck Regulator
in SOT23-5 Package
Microchip Technology Inc.
MCP1603T-120I/OS
1
U1
500 mA Synchronous Buck Regulator
in SOT23-5 Package
Microchip Technology Inc.
MCP1603T-180I/OS
1
U1
500 mA Synchronous Buck Regulator
in SOT23-5 Package
Microchip Technology Inc.
MCP1603T-330I/OS
Note 1:
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.
© 2008 Microchip Technology Inc.
DS51750A-page 13
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01/02/08
DS51750A-page 14
© 2008 Microchip Technology Inc.