© 2005 Microchip Technology Inc. DS51581A
MCP1650 SEPIC
Demo Board User’s Guide
DS51581A-page ii © 2005 Microchip Technology Inc.
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MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
© 2005 Microchip Technology Inc. DS51581A-page iii
Table of Contents
Preface ...........................................................................................................................1
Chapter 1. Product Overview........................................................................................5
1.1 Introduction ...............................................................................................5
1.2 What is the MCP1650 SEPIC Demo Board? .................... ........... .............5
1.3 What the MCP1650 SEPIC Demo Board Kit Includes ........... .. ....... .. ....... .5
Chapter 2. Installation and Operation ..........................................................................7
2.1 Introduction ...............................................................................................7
2.2 Features ...................................................................................................7
2.3 Getting Started ......................................................................................... 8
Appendix A. Schematic and Layout ..........................................................................11
A.1 Introduction .............................................................................................11
A.2 Board Schematic .................................................................................. 12
A.3 Board – Top Overlay .............................................................................13
A.4 Board – Top Layer ................................................................................14
A.5 B o a rd – B o ttom La y e r ........ ....... ....... ...... ....... .. ....... ...... ....... ....... ...... ... 1 5
Appendix B. Bill Of Materials (BOM) .........................................................................17
Worldwide Sales and Service ....................................................................................18
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page iv © 2005 Microchip Technology Inc.
NOTES:
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
© 2005 Microchip Technology Inc. DS51581A-page 1
Preface
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP1650 SEPIC Demo Board. Items discussed in this chapter include:
• Document Lay out
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Web Site
• Customer Support
• Document Rev isio n History
DOCUMENT LAYOUT
This document describes how to use the MCP1650 SEPIC Demo Board. The manual
layout is as follows:
•Chapter 1. “Product Overview” – Important information about the MCP1650
SEPIC Demo Board.
•Chapter 2. “Installation and Operation” – Includes a description of the
evaluation board, as well as instructions on how to get started.
•Appendix A. “Schematic and Layout” – Shows the schematic and layout
diagrams for the MCP1650 SEPIC Demo Board.
•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP1650 SEPIC Demo Board.
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.
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 2 © 2005 Microchip Technology Inc.
CONVENTIONS USED IN THIS GUIDE
This manu al us es the followi ng docum entatio n conv en tion s:
RECOMMENDED READING
This user's guide describes how to use the MCP1650 SEPIC Demo Board. The
following Microchip documents are available and recommended as supplemental
reference resources.
MCP1650/5 1/52 /53 Data Sheet, “750 kHz Boost Controller” (DS21876)
This data sheet provides detailed information regarding the MCP1650/51/52/53 family
of boost controllers.
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic char acters Referenced books MPLAB® IDE User’s Guide
Emphasized text ...is the only co mp ile r...
Initial caps A window the Output window
A dialog the Settings dialog
A menu selection select Enable Programmer
Quotes A field name in a window or
dialog “Save project before build”
Underlined, italic text with
right angle bracket A menu path File>Save
Bold characters A dialog button Click OK
A tab Click the Power tab
Text in angle brackets < > A key on the keyboard Press <Ent er>, <F1>
Courier New font:
Plain Courier New Sample source code #define START
Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’
Italic Courier New A variable argument file.o, where file can be
any val id filena me
Square brackets [ ] Optional arguments mcc18 [options] file
[options]
Curly brackets and pipe
character: { | } Choice of mutually exclu s ive
arguments; an OR selection errorlevel {0|1}
Ellipses... Replaces repeated text var_name [,
var_name...]
Represents code supplied by
user void main (void)
{ ...
}
Preface
© 2005 Microchip Technology Inc. DS51581A-page 3
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:
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programs, design resources, user’s guides and hardware support documents,
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CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
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• 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
DOCUMENT REVISION HISTORY
Revision A (September 2005)
• Initial Release of this Document.
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 4 © 2005 Microchip Technology Inc.
NOTES:
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
© 2005 Microchip Technology Inc. DS51581A-page 5
Chapter 1. Product Overview
1.1 INTRODUCTION
The MCP1650 SEPIC Demo Board is used to evaluate Microchip’s MCP1650 boost
controller in a low-power application that requires a regulated output voltage from an
input voltage that can be greater than, less than or equal to the output voltage. As pro-
vided, the MCP1650 SEPIC Demo Board generates a 5.0V output from a 3V to 7V
source.
This chapter covers the following topics:
• What is the MCP1650 SEPIC Demo Board?
• What the MCP1650 SEPIC Demo Board Kit Includes.
1.2 WHAT IS THE MCP1650 SEPIC DEMO BOARD?
The MCP1650 SEPIC Demo Board is a complete, step-up or step-down, Switch mode,
DC-DC power converter. The MCP1650 SEPIC Demo Board generates a regulated
5.0V output at load currents up to 160 mA. The SEPIC topology has the ability to
step-up or step-down the input voltage. The input voltage range for the MCP1650
SEPIC Demo Board is from 3.0V to 7.0V.
Test points are provided for input power, output load and shutdown control.
1.3 WHAT TH E MCP1650 SEPIC DEMO BOARD KIT INCLUDES
This MCP1650 SEPIC Demo Board kit includes:
• The MCP1650 SEPIC Demo Board (102-00079)
• The MCP1650 SEPIC Demo Board User’s Guide (DS51581)
• MCP1650/5 1/52 /53 Data Sheet, “750 kHz Boost Controller” (DS21876)
FIGURE 1-1: MCP1650 SEPIC Demo Board Block Diagram.
SEPIC Topology
MCP1650
3V - 7V Input
5V @ 160 mA
Load
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 6 © 2005 Microchip Technology Inc.
NOTES:
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
© 2005 Microchip Technology Inc. DS51581A-page 7
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP1650 SEPIC Demo Board demonstrates Microchip’s MCP1650 750 kHz
Boost Controller in an application that requires a regulated output voltage from a
source that is greater than, less than or equal to the regulated output voltage. The
MCP1650 is a gated oscillator boost controller developed for high-power, portable
applications. By driving an external MOSFET, the MCP1650 controller can deliver
5 watts of power to the load. The high switching frequency minimizes the size of the
external inductor and capacitor, saving both board space and cost.
The Single-Ended Primary Inductance Converter (SEPIC) topology utilized on this
board has the ability to produce a regulated output from a wide-ranging source. Some
advantages of the SEPIC topology versus other topologies are the low-ripple input
current, the ability to step-up or step-down the input voltage without inverting the output
voltage, no required transformer and the output is capacitively isolated from the input
to protect against switch failure.
2.2 FEATURES
The MCP1650 SEPIC Demo Board has the following features:
• Wide input voltage range: 3.0V to 7.0V
• Regulated 5.0V output voltage
• Maximum output current: 160 mA
• Complete low-profile, space-saving power supply
• Test point to apply external Enable signal
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 8 © 2005 Microchip Technology Inc.
2.3 GETTING STARTED
The MCP1650 SEPIC Demo Board is fully assembled and tested for generating a reg-
ulated 5.0V output voltage. The MCP1650 SEPIC Demo Board requires the use of an
external input voltage source (3.0V–7.0V).
2.3.1 Power Input and Output Connections
2.3.1.1 POWERING THE MCP1650 SEPIC DEMO BOARD
Apply the input voltage to the VIN (TP1) and GND (TP2) test points. The input voltage
should be limited to the 0V to +7.0V range. For normal operation, the input voltage must
be between +3.0V and +7.0V.
2.3.1.2 APPLY THE LOAD TO THE R EGULATED OUTPUT VOLTAG E TEST
POINTS
1. To apply a load to the MCP1650 SEPIC Demo Board, the positive side (+) of the
load should be connected to the VOUT test point (TP4). The negative side (–) of
the load should be connected to the GND test point (TP5).
2. The maximum load current for the MCP1650 SEPIC Demo Board is 160 mA.
Applying a load greater than the stated maximum will cause the output voltage
to pull out of regulation.
2.3.1.3 ENABLING/DISABLING THE MCP1650 SEPIC DEMO BOARD
The SHDN pin of the MCP1650 is pulled-up to VIN so that the device is always enabled.
The SHDN test point (TP3) can be used to apply an external Enable signal to the
device. Pulling TP3 to ground will disable the part.
FIGURE 2-1: MCP1650 SEPIC Demo Board Assembly Drawing.
Conne ct inp ut
voltage to TP1
Conne ct inp ut
ground to TP2
Connect output
load to TP4
Connect output
ground to TP5
Installation and Operation
© 2005 Microchip Technology Inc. DS51581A-page 9
2.3.2 Evaluating the Application
The MCP1650 SEPIC Demo Board can be used to provide a low-cost, minimal size,
low-power bias circuit. A well-regulated 5V at 160 mA output is produced from a 3.0V
to 7.0V input source. This voltage range allows the source to be a single Li-Ion battery
or three to four NiMH batteries.
The SEPIC topology is employed to convert this wide-ranging input source to a
well-regulated 5 volts. The SEPIC has the ability to automatically buck or boost the
input source. By coupling the two inductors onto one magnetic core, a small footprint,
low parts-count, low-power step-up or step-down converter is developed.
To truly evaluate the effectiveness of the MCP1650 SEPIC Demo Board, the input volt-
age must be varied over the entire operating range, while the load is varied from 0A to
160 mA. Test points are provided for connecting the variable input voltage source (TP1
and TP2) and a variable load (TP4 and TP5). An additional test point (TP3) is con-
nected to the shutdown pin (SHDN) of the MCP1650. On the board, the SHDN pin is
pulled- up to VIN. However, by connecting TP3 to GND, the converter can be disabled.
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 10 © 2005 Microchip Technology Inc.
NOTES:
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
© 2005 Microchip Technology Inc. DS51581A-page 11
Appendix A. Schematic and Layout
A.1 INTRODUCTION
This appendix contains the following schematic and layout diagrams for the MCP1650
SEPIC Demo Board:
• Board Schem atic
• Board – Top Overlay
• Board – Top Layer
• Board – Bottom Layer
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 12 © 2005 Microchip Technology Inc.
A.2 BOARD SCHEMATIC
2
S
3
D
1
G
Schem ati c an d La yout
© 2005 Microchip Technology Inc. DS51581A-page 13
A.3 BOARD – TOP OVERLAY
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 14 © 2005 Microchip Technology Inc.
A.4 BOARD – TOP LAYER
Schem ati c an d La yout
© 2005 Microchip Technology Inc. DS51581A-page 15
A.5 BOARD – BOTTOM LAYER
MCP1650 SEPIC Demo Board User’s Guide
DS51581A-page 16 © 2005 Microchip Technology Inc.
NOTES:
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
© 2005 Microchip Technology Inc. DS51581A-page 17
Appendix B. Bill Of Materials (BOM)
TABLE B-1: BILL OF MATERIALS (BOM)
Qty. Reference Description Mfgr. Part Number
3 C1, C3, C4 4.7 μF, X5R Ceramic, 16V, 0805 Panasonic®ECJ-2FB1C475K
1C2 2.2 μF, X5R Ceramic, 16V, 0805 Panasonic ECJ-2FB1C225K
1L1 3.3 μH, Dual Inductor Co iltronics®DRQ73-3R3
1 D1 Schott ky Dio de, 30V, Dual Philip s Elec tronics BAT54C
1 D2 Schottky Diode, 20V Panasonic MA2ZD1800L
1 Q1 N-Channel 20V 4.2A MOSFET International Rectifier IRLML2502
1R5 10 KΩ, 1/10W, 1%, 0603 Rohm MCR03EZPJ103
1R1 27.4 KΩ, 1/10W, 1%, 0603 Rohm MCR03EZPFX2742
1R4 30.9 KΩ, 1/10W, 1%, 0603 Rohm MCR03EZPFX3092
1R2 100 KΩ, 1/10W, 1%, 0603 Rohm MCR03EZPFX1003
1R3 499 KΩ, 1/10W, 1%, 0603 Rohm MCR03EZPFX4993
5 TP1,TP2, TP3, TP4 ,
TP5 Test Point Keystone Electronics®5016
1 U1 750 kHz, Boost Controller, MSOP Microchip Technology Inc. MCP1650R-E/MS
DS51581A-page 18 © 2005 Microchip Technology Inc.
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**DS51581A**
WORLDWIDE SALES AND SERVICE
08/24/05
