MCP7381X
Low-Cost Li-Ion Battery
Charger Evaluation Board
User’s Guide
© 2008 Microchip Technology Inc.
DS51729A
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DS51729A-page ii
© 2008 Microchip Technology Inc.
MCP7381X LI-ION BATTERY CHARGER
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
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP7381X Li-Ion Battery Charger Evaluation Board? ............... 7
1.3 What the MCP7381X Li-Ion Battery Charger Evaluation Board Kit Includes . 7
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 9
2.2 Features ......................................................................................................... 9
2.3 Getting Started ............................................................................................. 10
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 13
A.2 Board – Schematic ....................................................................................... 14
A.3 Board – Top Layer ....................................................................................... 15
A.4 Board – Top Metal Layer ............................................................................. 15
A.5 Board – Bottom Layer ................................................................................. 16
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 18
© 2008 Microchip Technology Inc.
DS51729A-page iii
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
NOTES:
DS51729A-page iv
© 2008 Microchip Technology Inc.
MCP7381X LI-ION BATTERY CHARGER
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
MCP7381X Li-Ion Battery Charger 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 MCP7381X Li-Ion Battery Charger Evaluation
Board 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 MCP7381X
Li-Ion Battery Charger 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 MCP7381X Li-Ion Battery Charger Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP7381X Li-Ion Battery Charger Evaluation Board.
© 2008 Microchip Technology Inc.
DS51729A-page 1
MCP7381X Li-Ion Battery Charger 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
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
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
RECOMMENDED READING
This user's guide describes how to use MCP7381X Li-Ion Battery Charger Evaluation
Board. The following Microchip documents are available and recommended as
supplemental reference resources.
MCP73811/2 Data Sheet, “Simple, Miniature Single-Cell, Fully Integrated Li-Ion /
Li-Polymer Charge Management Controllers”, DS22036
This data sheet provides detailed information regarding the MCP73811/2 product
family.
DS51729A-page 2
© 2008 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
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 (April 2008)
• Initial Release of this Document.
© 2008 Microchip Technology Inc.
DS51729A-page 3
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
NOTES:
DS51729A-page 4
© 2008 Microchip Technology Inc.
MCP7381X LI-ION BATTERY CHARGER
EVALUATION BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP7381X Li-Ion Battery Charger Evaluation Board demonstrates the features
and abilities for Microchip’s MCP7381X Li-Ion Battery Charger Evaluation Board Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management
Controllers. The MCP73811/2 are standalone highly integrated linear Li-Ion battery
chargers that employ a constant current/constant voltage (CCCV) charge algorithm for
cost sensitive and space limited applications.
The MCP7381X Li-Ion Battery Charger Evaluation Board has two independent circuits
that are available to evaluate an USB port powered Li-Ion / Li-Polymer battery charger
and an ac-dc wall adapter powered Li-Ion / Li-Polymer battery charger. For an ac-dc
wall adapter powered battery charger, an external resistor (RPROG) sets the magnitude
of the charge current up to 500 mA. When the USB port provides power to the battery
charger, the MCP73811 specifically adheres to the current limits governed by the USB
specification. The PROG pin selects two preset charge current rates of typical 85 mA
(Low) or 450 mA (High) and does not exceed 100 mA (Low) or 500 mA (High)
maximum charge current. As for USB regulation, a device may draw either low-power
at one unit load or high-power at 5 unit loads. A unit load is defined to be 100 mA. The
drawn current per unit load is an absolute maximum value, not an average over time.
This chapter covers the following topics:
• “What is the MCP7381X Li-Ion Battery Charger Evaluation Board?”
• “What the MCP7381X Li-Ion Battery Charger Evaluation Board Kit includes.”
Li-Ion Battery Charger
4
VBAT 3
VDD
CIN
COUT
PROG
+
5
REGULATED
WALL CUBE
-
Single
Li-Ion
Cell
RPROG
1 CE
VSS 2
MCP73812
FIGURE 1-1:
© 2008 Microchip Technology Inc.
MCP73812 Typical Application.
DS51729A-page 5
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
5.0
400
3.0
300
1
2.0
200
100
180
165
150
135
120
105
90
0
75
60
45
0
0.0
30
MCP73812T-420I/OT
VDD = 5.0V
RPROG = 2 kΩ
1.0
Charge Current (mA)
4.0
15
Battery Voltage (V)
500
Time (Minutes)
FIGURE 1-2:
Typical MCP73812 Charge Profile (950 mAh Li-Ion Battery Pack).
500 mA Li-Ion Battery Charger
VIN
4
VDD
VBAT
3
1 µF
1 µF
5
+
Single
Li-Ion
Cell
PROG
-
1
VSS
CE
2
MCP73811
FIGURE 1-3:
DS51729A-page 6
Typical MCP73811 Applications.
© 2008 Microchip Technology Inc.
Product Overview
1.2
WHAT IS THE MCP7381X LI-ION BATTERY CHARGER EVALUATION
BOARD?
The MCP7381X Li-Ion Battery Charger Evaluation Board demonstrates the use of the
MCP73811/2 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer
Charger Management Controllers.
The MCP7381X Li-Ion Battery Charger Evaluation Board is setup to evaluate low cost
single-cell Li-Ion / Li-Polymer battery chargers. This board utilizes Microchip's
MCP7381X Li-Ion Battery Charger Evaluation Board that efficiently charge Li-Ion /
Li-Polymer batteries with a preset +1% voltage accuracy regulation at 4.2V. The
MCP7381X Li-Ion Battery Charger Evaluation Board comes with two pre-installed circuits: An ac-dc adapter powered Li-Ion /Li-Polymer battery charger and an USB port
powered Li-Ion / Li-Polymer battery charger.
The MCP73811 is available for the USB port powered circuit while the MCP73812 is
designed for the ac-dc wall adapter powered circuit. A SOT-23-5 MCP73811 is
pre-installed on the evaluation board with a mechanical dip switch which selects charge
current High (450 mA) or Low (85 mA) for the USB port powered battery charger
system. A SOT23-5 MCP73812 is pre-installed on the evaluation board with a programming resistor RPROG which delivers 500 mA from the ac-dc wall adapter source.
When the Chip Enable (CE) pin is in “High” condition, that particular circuit is ready to
charge single-cell Li-Ion batteries.
Note:
The systems are designed in operation mode with CE pin High and can be
disabled when driving CE pin Low.
The two dashed silk screen areas on the evaluation board show the required circuit
size for the printed circuit board (PCB) layout and provide system / product designers
a visual aid prior design the system.
The MCP7381X Li-Ion Battery Charger Evaluation Board is designed to observe the
performance and features via multiple test points that are available on the circuits.
Users are able to discover the compact size of the layout in addition to the device itself.
The circuit can also be implemented into suitable applications without any additional
works.
1.3
WHAT THE MCP7381X LI-ION BATTERY CHARGER EVALUATION BOARD
KIT INCLUDES
The MCP7381X Li-Ion Battery Charger Evaluation Board kit includes:
• MCP7381X Li-Ion Battery Charger Evaluation Board, 102-00172
• Pre-installed 5-Lead SOT-23 MCP73811, 5-Lead SOT-23 MCP73812 and
required components.
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
- MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide,
(DS51729)
- MCP73811/2 Data Sheet, “Simple, Miniature Single-Cell, Fully Integrated
Li-Ion / Li-Polymer Charge Management Controllers”, (DS22036)
© 2008 Microchip Technology Inc.
DS51729A-page 7
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
NOTES:
DS51729A-page 8
© 2008 Microchip Technology Inc.
MCP7381X LI-ION BATTERY CHARGER
EVALUATION BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP7381X Low-Cost Li-Ion Battery Charger Evaluation Board demonstrates
Microchip's Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge
Management Controllers, MCP73811 and MCP73812. The MCP73811 is powered
from USB port to charge Li-Ion / Li-Polymer batteries. The charge current is logic
selectable between High (500 mA) and Low (100 mA). The MCP73812 is designed to
charge Li-Ion / Li-Polymer batteries with programmable charging current up to 500 mA
by a single resistor from a regulated 5V ac-dc wall adapter.
The MCP73811/2 require only minimum components to implement a completed circuit
of Li-Ion / Li-Polymer battery charge management in any systems. The development of
MCP73811/2 meets the challenges of today’s cost-sensitive and space-limited applications.
The MCP7381X Low-Cost Li-Ion Battery Charger Evaluation Board comes with a
pre-installed 5-Lead SOT-23 MCP73811 and a pre-installed 5-Lead SOT-23
MCP73812.
Typical applications for MCP73811/2 are Rechargeable Toys, Low-Cost Lithium-Ion /
Lithium-Polymer Battery Chargers, Electronic Cigarettes, Rechargeable Portable
Electronic Devices, Bluetooth Headsets or USB Chargers.
2.2
FEATURES
The MCP7381X Low-Cost Li-Ion Battery Charger Evaluation Board has the following
features:
• Color coded test points ensuring the proper connections: Red for VDD and VBAT+;
Black for GND & VBAT-;White for CE (Chip Enable).
• 2-position Dip Switch for charge current selections between USB_Low and
USB_High.
• Chip Enable (CE) Pin to disable the system when drive Low.
• Evaluating different charge current rates by changing RPROG (Programming
Resistor) values. See Figure 2-1
© 2008 Microchip Technology Inc.
DS51729A-page 9
Charge Current (mA)
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
550
500
450
400
350
300
250
200
150
100
50
0
1
2
4
6
8
10
12
14
16
18
20
Programming Resistor (kΩ)
FIGURE 2-1:
2.3
Charge Current (IOUT) vs. Programming Resistor (RPROG).
GETTING STARTED
The MCP7381X Low-Cost Li-Ion Battery Charger Evaluation Board is fully assembled
and tested for charging single-cell Li-Ion / Li-Polymer batteries with a regulated 5V DC
source or USB port.
2.3.1
Power Input and Output Connection
2.3.1.1
POWERING THE MCP7381X LOW-COST LI-ION BATTERY CHARGER
EVALUATION BOARD
1. Connect the negative battery terminal to VBAT- pin on the evaluation board and
positive battery terminal to VBAT+ pin on the evaluation board.
2. Connect 5V DC power supply negative terminal to GND pin on the evaluation
board.
3. Connect 5V DC power supply positive terminal to VDD pin on the evaluation
board. Slowly increase the supply voltage to 5V.
Note:
Make sure the current limit of the DC power supply is not set below the
charge current.
4. The battery charge cycle initiates when minimum supply voltage is present. The
charge current can be measured by placing a current meter in series between
VBAT+ pin on the evaluation board and positive battery terminal.
5. Position the DIP Switch to USB_Hi for a maximum charge rate up to 500 mA and
USB_Low for maximum charge rate up to 100 mA.
Note:
DS51729A-page 10
Remove protection film before using the DIP Switch. This may be done by
the manufacturer prior shipping.
© 2008 Microchip Technology Inc.
Installation and Operation
6. Fast Charge Current for MCP73812 can be programmed with various resistors
that based on the Figure 2-1. RPROG is represented as R1 on the evaluation
board.
Note:
The battery can be replaced with test circuit or electronic load that can sink
current with DC power supply.
7. Pull CE pin on the evaluation board Low to disable the system or terminate the
charge.
1
FIGURE 2-2:
Top Silk Layout.
© 2008 Microchip Technology Inc.
MCP7831X Low Cost Li-Ion Battery Charger Evaluation Board
DS51729A-page 11
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
NOTES:
DS51729A-page 12
© 2008 Microchip Technology Inc.
MCP7381X LI-ION BATTERY CHARGER
EVALUATION BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP7381X Low
Cost Li-Ion Battery Charger Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Metal Layer
Board – Bottom Layer
© 2008 Microchip Technology Inc.
DS51729A-page 13
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
A.2
BOARD – SCHEMATIC
DS51729A-page 14
© 2008 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
A.4
BOARD – TOP METAL LAYER
© 2008 Microchip Technology Inc.
DS51729A-page 15
MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide
A.5
BOARD – BOTTOM LAYER
DS51729A-page 16
© 2008 Microchip Technology Inc.
MCP7381X LI-ION BATTERY CHARGER
EVALUATION BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
QTY
BILL OF MATERIALS (BOM)
Reference
Description
Manufacture
MFG PART #
4
C1, C2, C3, C4
CAP CERAMIC 2.2 μF 10V X5R 0603 Taiyo Yuden
SMD
LMK107BJ225KA-T
1
R1
RES 2K OHM 1/10W 1% 0603 SMD
Yageo Corp.
RC0603FR-072KL
2
R2, R3
RES 100K OHM 1/10W 1% 0603
SMD
Panasonic - ECG
ERJ-3EKF1003V
1
SW1
SWITCH SLIDE SPDT SMD J-LEAD
COPAL ELECTRONICS
INC
CJS-1200TA
4
Bump
BUMPON HEMISPHERE.44X.20
WHITE
3M
SJ5003-9-ND
1
U1
Simple, Miniature Single-Cell, Fully
Microchip Technology, Inc MCP73812T-420I/OT
Integrated Li-Ion / Li-Polymer Charge
Management controllers: Programmable Charge Current
1
U2
Simple, Miniature Single-Cell, Fully
Integrated Li-Ion / Li-Polymer Charge
Management controllers: Selectable
Charge Current
Microchip Technology, Inc MCP73811T-420I/OT
1
PCB
Printed Circuit Board
—
Note 1:
104-00172-R1
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.
DS51729A-page 17
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Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/02/08
DS51729A-page 18
© 2008 Microchip Technology Inc.