Microchip MCP73223 Manual
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© 2009 Microchip Technology Inc. DS51850A
MCP73X23
Lithium Iron Phosphate (LiFePO4)
Battery Charger
Evaluation Board
User’s Guide
DS51850A-page ii © 2009 Microchip Technology Inc.
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and may be superseded by updates.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, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
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rfPIC and UNI/O are registered trademarks of Microchip
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ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICkit, PICDEM, PICDEM.net,
PICtail, PIC32 logo, REAL ICE, rfLAB, Select Mode, Total
Endurance, TSHARC, WiperLock and ZENA are trademarks
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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.
© 2009, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
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and India. The Company’s quality system processes and procedures
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.
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
© 2009 Microchip Technology Inc. DS51850A-page iii
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 MCP73X23 Lithium Iron Phosphate Battery Battery Charger
Evaluation Board? .................................................................................... 6
1.3 What the MCP73X23 Lithium Iron Phosphate Battery Battery Charger
Evaluation Board Kit Includes: .................................................................. 6
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 8
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 11
A.2 Board – Schematic ....................................................................................... 12
A.3 Board – Assembly Drawing .......................................................................... 13
A.4 Board – Top Layer ....................................................................................... 14
A.5 Board – Top Metal Layer ............................................................................. 15
A.6 Board – Bottom Layer ................................................................................. 16
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 18
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page iv © 2009 Microchip Technology Inc.
NOTES:
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
© 2009 Microchip Technology Inc. DS51850A-page 1
Preface
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP73X23 Lithium Iron Phosphate 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 MCP73X23 Lithium Iron Phosphate Battery
Charger Evaluation Board. The manual layout is as follows:
•Chapter 1. “Product Overview” – Important information about the MCP73X23
Lithium Iron Phosphate 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 MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation
Board.
•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation 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.
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.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 2 © 2009 Microchip Technology Inc.
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
RECOMMENDED READING
This user's guide describes how to use MCP73X23 Lithium Iron Phosphate Battery
Charger Evaluation Board. The following Microchip document is recommended as
supplemental reference resources.
MCP73123/223 Data Sheet, “Lithium Iron Phosphate (LiFePO4) Battery Charge
Management Controller with Input Overvoltage Protection”, DS22191
This data sheet provides detailed information regarding the MCP73123/223 product
family.
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic characters Referenced books MPLAB® IDE User’s Guide
Emphasized text ...is the only compiler...
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
‘bnnnn A binary number where n is a
digit
‘b00100, ‘b10
Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>
Courier font:
Plain Courier 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
Italic Courier A variable argument file.o, where file can be
any valid filename
0xnnnn A hexadecimal number where
n is a hexadecimal digit
0xFFFF, 0x007A
Square brackets [ ] Optional arguments mcc18 [options] file
[options]
Curly brackets and pipe
character: { | }
Choice of mutually exclusive
arguments; an OR selection
errorlevel {0|1}
Ellipses... Replaces repeated text var_name [,
var_name...]
Represents code supplied by
user
void main (void)
{ ...
}
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 4 © 2009 Microchip Technology Inc.
NOTES:
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
© 2009 Microchip Technology Inc. DS51850A-page 5
Chapter 1. Product Overview
1.1 INTRODUCTION
The MCP73123/223 product family is highly integrated linear charge management
controllers for lithium iron phosphate (LiFePO4) batteries. The MCP73123/223 product
family operates with minimum external components, which is ideal for use in
space-limited and cost-effective applications. The maximum 18V rated input over
voltage protection and battery short circuit protection offer designers a secondary
protection in addition to the Li-Ion battery protection circuit.
This chapter provides an overview of the MCP73X23 Lithium Iron Phosphate Battery
Charger Evaluation Boardand covers the following topics:
• “What is the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation
Board?”
• “What the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board
Kit Includes”
FIGURE 1-1: MCP73123 Typical Application.
STAT
VDD
NC
5
3
1
2
PROG
8
7
9
10
REGULATED
WALL CUBE
CIN
+
-
LiFePO4
Battery
NC
6
4
RLED
VDD
VBAT
VBAT
VSS
VSS
COUT
RPROG
MCP73123
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 6 © 2009 Microchip Technology Inc.
1.2 WHAT IS THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER
EVALUATION BOARD?
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board demon-
strates the features of Microchip’s MCP73123 and MCP73223 “Lithium Iron Phos-
phate (LiFePO4) Battery Charge Management Controller with Input Overvoltage
Protection”.
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board is designed
with two independent circuits. The MCP73123 is designed to charge a single-cell
LiFePO4 battery, while the MCP73223 charges a dual-cell LiFePO4 battery. Both
circuits offer two different fast charging currents. The default value of fast charging
current is 500 mA and when PROG via is tie to ground, the two parallel resistors output
1000 mA fast charging current to a battery pack. One blue LED status output allows
user to learn if the MCP73123/223 is in charging state or not.
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board comes with
installed MCP73123 and MCP73223 devices in 3 mm x 3 mm DFN packages. The
factory preset battery regulation voltage is 3.6V for the MCP73123 and 7.2V for the
MCP73223 with 10% precondition current, 10% termination current set point, auto-
matic recharge and 6.5V over voltage protection threshold voltage.
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board is designed
to observe the performance and features of Microchip’s MCP73123 and MCP73223.
Circuits can also be implemented into suitable applications without extra work.
1.3 WHAT THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER
EVALUATION BOARD KIT INCLUDES
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board kit includes:
• MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board, 102-00262
• Important Information Sheet.
Note: Please refer to Table 2-2 for Charge Status Outputs and Table 2-1 for Fast
Charge Current vs. Resistor Lookup Table.
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
© 2009 Microchip Technology Inc. DS51850A-page 7
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP73123/223 is a highly integrated Li-Ion battery charge management controller
for use in space-limited and cost-sensitive applications. The MCP73123/223 provides
specific charge algorithms for Lithium Iron Phosphate batteries to achieve optimal
capacity and safety in the shortest charging time possible. Along with its small physical
size, the low number of external components makes the MCP73123/223 ideally
suitable for low-cost and small-capacity (less than 2000 mAh) LiFePO4 battery
applications. It will take longer time to complete a charge cycle for larger capacity
LiFePO4 battery packs.
The absolute maximum voltage, up to 18V over voltage protection, allows the use of
MCP73123/223 in harsh environments, such as low cost ac-dc adapter.
The MCP73123/223 employs a constant current / constant voltage (CC-CV) charge
algorithm and 3.6V per cell voltage regulations. The fast charge, constant current value
is set with one external resistor from 130 mA to 1100 mA. The MCP73123/223 also
limits the charge current based on die temperature during high power or high ambient
conditions. This thermal regulation optimizes the charge cycle time while maintaining
device reliability.
The PROG pin of the MCP73123/223 also serves as enable pin. When high impedance
(typ. 200 kΩ) is applied, the MCP73123/223 will be in standby mode.
Typical applications for the reference design are Toys, Power Tools, Uninterrupt Power
Supply, Backup Power Storage and applications in wider temperature range than
typical Li-Ion batteries.
2.2 FEATURES
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board has the
following features:
• Input Over Voltage Protection:
- 6.5V for the MCP73123,
- 13V for the MCP73223
• Charge Regulation Voltage:
- 3.6V for the MCP73123,
- 7.2V for the MCP73223
• 10% Preconditioning of Deeply Depleted Cells
• 32-Minute Preconditioning Timer
• 6-Hour Safety Timer
• 10% Automatic Charge Termination
• 500 mA and 1000 mA Preset Fast Charge Current
• Automatic Recharge
• Thermal Regulation
• One Blue LED Charge Status Indicator For Each Circuit
• Pre-installed MCP73123 and MCP73223 Devices
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 8 © 2009 Microchip Technology Inc.
2.3 GETTING STARTED
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board is fully
assembled and tested for charging LiFePO4 batteries.
2.3.1 Power Input and Output Connection
2.3.1.1 POWERING THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY
CHARGER EVALUATION BOARD
1. Connect the positive battery terminal to VBAT+ and negative battery terminal to
VBAT-.
2. Connect the DC power supply Negative Terminal to VSS.
3. Connect the DC power supply Positive Terminal to VDD.
4. It should initiate the battery charging cycle when the power source is present and
VBAT is below recharge threshold. For example, When VREG is 3.6V, VBAT needs
to be lower than 3.42V to initiate the charge cycle.
5. The charging status table is available on Table 2-2.
6. The fast charge current is preset at 500 mA and can be increased to 1A by
connecting PROG via to ground.
FIGURE 2-1: Board Top Assembly.
Note 1: The MCP73123 circuit is designed to charge one-cell LiFePO4 battery
and the MCP73223 circuit is designed to charge two-cell LiFePO4
battery.
2: The LiFePO4 battery can be replaced with test circuit or electronic load
that can sink current with DC power supply. Refer to Figure 2-3.
Note: Fast Charge Current can be programmed with various resistors based on
Figure 2-2 and Table 2-2.
Installation and Operation
© 2009 Microchip Technology Inc. DS51850A-page 9
FIGURE 2-2: MCP73123/223 Charge Current (IOUT) vs. Programming Resistor
(RPROG).
TABLE 2-1: MCP73123/223 RESISTOR LOOKUP TABLE
Charge Current (mA) Recommended E96 Resistor
( )Ω
Recommended E24 Resistor
( )Ω
130 10k 10k
150 8.45k 8.20k
200 6.20k 6.20k
250 4.99k 5.10k
300 4.02k 3.90k
350 3.40k 3.30k
400 3.00k 3.00k
450 2.61k 2.70k
500 2.32k 2.37k
550 2.10k 2.20k
600 1.91k 2.00k
650 1.78k 1.80k
700 1.62k 1.60k
750 1.50k 1.50k
800 1.40k 1.50k
850 1.33k 1.30k
900 1.24k 1.20k
950 1.18k 1.20k
1000 1.10k 1.10k
1100 1.00k 1.00k
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1 2 3 4 5 6 7 8 9 1011121314151617181920
Programming Resistor (Ω)
Charge Current (mA)
VDD = 5.2V
TA
= +25°C
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 10 © 2009 Microchip Technology Inc.
FIGURE 2-3: Simulated Battery Load for MCP73123/223.
1
DC
Power
Source Volt
Meter
R
5Ω
10W
Microchip
Battery
Charge
Management
Controller
Amp
Meter
VBAT+
VBAT-
GND
1000 µF
TABLE 2-2: MCP73123/223 CHARGE STATUS OUTPUTS
CHARGE CYCLE STATE STAT
Shutdown Hi-Z
Standby Hi-Z
Preconditioning L
Constant Current Fast Charge L
Constant Voltage L
Charge Complete - Standby Hi-Z
Temperature Fault 1.6 second 50% D.C. Flashing (Type 1)
Hi-Z (Type 2)
Timer Fault 1.6 second 50% D.C. Flashing (Type 1)
Hi-Z (Type 2)
Preconditioning Timer Fault 1.6 second 50% D.C. Flashing (Type 1)
Hi-Z (Type 2)
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
© 2009 Microchip Technology Inc. DS51850A-page 11
Appendix A. Schematic and Layouts
A.1 INTRODUCTION
This appendix contains the following schematics and layouts for the MCP73X23
Lithium Iron Phosphate Battery Charger Evaluation Board:
• Board – Schematic
• Board – Top Layer
• Board – Top Metal Layer
• Board – Bottom Layer
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 12 © 2009 Microchip Technology Inc.
A.2 BOARD – SCHEMATIC
M
Schematic and Layouts
© 2009 Microchip Technology Inc. DS51850A-page 13
A.3 BOARD – TOP LAYER
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 14 © 2009 Microchip Technology Inc.
A.4 BOARD – TOP METAL LAYER
Schematic and Layouts
© 2009 Microchip Technology Inc. DS51850A-page 15
A.5 BOARD – BOTTOM LAYER
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
DS51850A-page 16 © 2009 Microchip Technology Inc.
NOTES:
Produkt Specifikationer
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| Kategori: | Ikke kategoriseret |
| Model: | MCP73223 |
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