MCP73X23
Lithium Iron Phosphate (LiFePO4)
Battery Charger
Evaluation Board
User’s Guide
© 2009 Microchip Technology Inc.
DS51850A
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DS51850A-page ii
© 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE
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 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
© 2009 Microchip Technology Inc.
DS51850A-page iii
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
NOTES:
DS51850A-page iv
© 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE
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
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.
© 2009 Microchip Technology Inc.
DS51850A-page 1
MCP73X23 Lithium Iron Phosphate 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
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
‘bnnnn
Text in angle brackets < >
Courier font:
Plain Courier
Italic Courier
0xnnnn
Square brackets [ ]
Curly brackets and pipe
character: { | }
Ellipses...
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 binary number where n is a
digit
A key on the keyboard
Click OK
Click the Power tab
‘b00100, ‘b10
File>Save
Press <Enter>, <F1>
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
A variable argument
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
file.o, where file can be
any valid filename
A hexadecimal number where 0xFFFF, 0x007A
n is a hexadecimal digit
Optional arguments
mcc18 [options] file
[options]
Choice of mutually exclusive errorlevel {0|1}
arguments; an OR selection
Replaces repeated text
var_name [,
var_name...]
Represents code supplied by void main (void)
user
{ ...
}
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.
DS51850A-page 2
© 2009 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
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• Business of Microchip – Product selector and ordering guides, latest Microchip
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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
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 (July 2009)
• Initial Release of this Document.
© 2009 Microchip Technology Inc.
DS51850A-page 3
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
NOTES:
DS51850A-page 4
© 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
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”
1
VDD
VBAT
2 VDD
VBAT
3
4
CIN
COUT
7
REGULATED
WALL CUBE
STAT
RLED
+
5 NC
PROG
VSS
6 NC
VSS
10
9
LiFePO4
Battery
RPROG
-
8
MCP73123
FIGURE 1-1:
MCP73123 Typical Application.
© 2009 Microchip Technology Inc.
DS51850A-page 5
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
1.2
WHAT IS THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER
EVALUATION BOARD?
The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board demonstrates the features of Microchip’s MCP73123 and MCP73223 “Lithium Iron Phosphate (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.
Note:
Please refer to Table 2-2 for Charge Status Outputs and Table 2-1 for Fast
Charge Current vs. Resistor Lookup Table.
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, automatic 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.
DS51850A-page 6
© 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
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
© 2009 Microchip Technology Inc.
DS51850A-page 7
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
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.
Note 1:
2:
The MCP73123 circuit is designed to charge one-cell LiFePO4 battery
and the MCP73223 circuit is designed to charge two-cell LiFePO4
battery.
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.
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.
Note:
Fast Charge Current can be programmed with various resistors based on
Figure 2-2 and Table 2-2.
1
FIGURE 2-1:
DS51850A-page 8
Board Top Assembly.
© 2009 Microchip Technology Inc.
Charge Current (mA)
Installation and Operation
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
VDD = 5.2V
TA = +25°C
1
1 2 3 4 5 6 7 8 9 1011121314151617181920
Programming Resistor (Ω)
FIGURE 2-2:
(RPROG).
TABLE 2-1:
MCP73123/223 Charge Current (IOUT) vs. Programming Resistor
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
© 2009 Microchip Technology Inc.
950
1.18k
1.20k
1000
1.10k
1.10k
1100
1.00k
1.00k
DS51850A-page 9
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
Amp
Meter
DC
Power
Source
Volt
Meter
R
5Ω
10W
1000 µF
Microchip
Battery
Charge
Management
Controller
VBAT+
VBAT-
GND
FIGURE 2-3:
1
Simulated Battery Load for MCP73123/223.
TABLE 2-2:
DS51850A-page 10
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)
© 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE
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 MCP73X23
Lithium Iron Phosphate Battery Charger Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Metal Layer
Board – Bottom Layer
© 2009 Microchip Technology Inc.
DS51850A-page 11
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
BOARD – SCHEMATIC
M
A.2
DS51850A-page 12
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
© 2009 Microchip Technology Inc.
DS51850A-page 13
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51850A-page 14
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM LAYER
© 2009 Microchip Technology Inc.
DS51850A-page 15
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide
NOTES:
DS51850A-page 16
© 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE
BATTERY CHARGER EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS
Reference
Description
Part Number
4
Bump
3M
SJ5003-9-ND
4
C1, C2, C3, C4 CAP CERAMIC 4.7 µF 25V X5R 1206
TDK
C2012X5R1E475M
2
D1, D2
Blue Water Clear 0603 SMD LED
Para Light USA
L-C191LBCT-U1
1
PCB
RoHS Compliant Bare PCB, MCP73X23
Evaluation Board
Microchip Technology Inc.
104-00262
4
R1, R3, R4, R5 RES 2.37K OHM 1/10W 1% 0603 SMD
Panasonic® - ECG
ERJ-3EKF2371V
2
R2, R6
Panasonic - ECG
ERJ-3EKF1001V
8
TP1, TP2, TP3, PC Test Point Compact SMT
TP4, TP5, TP6,
TP7, TP8
Keystone Electronics®
5016
1
U1
Single-Cell Lithium Iron Phosphate Battery Microchip Technology Inc.
Charger with OVP
MCP73123-22S/MF
1
U2
Dual-Cell Lithium Iron Phosphate Battery
Charger with OVP
MCP73223-C2S/MF
Note 1:
BUMPON HEMISPHERE .44X.20 WHITE
Manufacturer
RES 1K OHM 1/10W 1% 0603 SMD
Microchip Technology Inc.
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.
© 2009 Microchip Technology Inc.
DS51850A-page 17
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Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
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: 886-3-6578-300
Fax: 886-3-6578-370
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
03/26/09
DS51850A-page 18
© 2009 Microchip Technology Inc.