MCP7386X
Battery Charger
Evaluation Board
User’s Guide
© 2006 Microchip Technology Inc.
DS51475C
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DS51475C-page ii
© 2006 Microchip Technology Inc.
MCP7386X EVALUATION
BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview
1.1 Introduction and Highlights ............................................................................. 5
1.2 What is the MCP7386X Battery Charger Evaluation Board? ......................... 5
1.3 What the MCP7386X Battery Charger Evaluation Board Includes ................ 5
Chapter 2. Installation and Operation
2.1 Features ......................................................................................................... 7
2.2 Getting Started ............................................................................................... 7
2.3 Detailed Description ....................................................................................... 8
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 11
A.2 Board Schematic ........................................................................................ 12
A.3 Board – Top Layer ..................................................................................... 13
A.4 Board – Silk Screen Layer ......................................................................... 14
A.5 Board – Bottom Layer ................................................................................ 15
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 18
© 2006 Microchip Technology Inc.
DS51475C-page iii
MCP7386X Evaluation Board User’s Guide
NOTES:
DS51475C-page iv
© 2006 Microchip Technology Inc.
MCP7386X 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.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP7386X 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 MCP7386X 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 MCP7386X
Battery Charger Evaluation Board.
• Chapter 2. “Installation and Operation” – For users evaluating the
MCP73861/2/3/4 devices, this chapter describes how to use the various features
of the hardware.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP7386X Battery Charger Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP7386X Battery Charger Evaluation Board.
© 2006 Microchip Technology Inc.
DS51475C-page 1
MCP7386X 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 key on the keyboard
Click OK
Click the Power tab
Press <Enter>, <F1>
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
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
File>Save
var_name [,
var_name...]
void main (void)
{ ...
}
RECOMMENDED READING
This user's guide describes how to use the MCP7386X Battery Charger Evaluation
Board. Other useful documents are listed below. The following Microchip documents
are available and recommended as supplemental reference resources.
MCP73861/2/3/4 Data Sheet, “Advanced Single or Dual-Cell, Fully-Integrated
Li-Ion/Li-Polymer Charge Management Controllers” (DS21893)
This data sheet provides detailed information regarding the MCP73861 Advanced
Single or Dual-Cell, Fully-Integrated, Lithium-Ion/Lithium-Polymer Charge
Management Controllers.
DS51475C-page 2
© 2006 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
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 C (July 2006)
• Add disclaimer to Bill of Materials regarding RoHS-Compliant part numbers.
Revision B (September 2005)
• Added References to MCP73861/2/3/4.
Revision A (June 2004)
• Initial Release of this Document.
© 2006 Microchip Technology Inc.
DS51475C-page 3
MCP7386X Evaluation Board User’s Guide
NOTES:
DS51475C-page 4
© 2006 Microchip Technology Inc.
MCP7386X EVALUATION
BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP7386X Battery Charger Evaluation Board
and covers the following topics:
• What is the MCP7386X Battery Charger Evaluation Board?
• What the MCP7386X Battery Charger Evaluation Board Includes
1.2
WHAT IS THE MCP7386X BATTERY CHARGER EVALUATION BOARD?
The MCP7386X Battery Charger Evaluation Board is an evaluation and demonstration
tool for Microchip Technology’s MCP7386X Advanced Single or Dual-Cell,
Fully-Integrated, Lithium-Ion/Lithium-Polymer Charge Management Controllers. The
design provides for dynamic versatility while being able to handle accurate
measurements.
When connected, this evaluation board allows for the evaluation of the MCP7386X
devices in a variety of applications.
1.3
WHAT THE MCP7386X BATTERY CHARGER EVALUATION BOARD
INCLUDES
This MCP7386X Battery Charger Evaluation Board Kit includes:
• The MCP7386X Battery Charger Evaluation Board
• MCP73861 Device (Installed)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
- MCP7386X Battery Charger Evaluation Board User’s Guide
© 2006 Microchip Technology Inc.
DS51475C-page 5
MCP7386X Evaluation Board User’s Guide
NOTES:
DS51475C-page 6
© 2006 Microchip Technology Inc.
MCP7386X EVALUATION
BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
FEATURES
The MCP7386X Battery Charger Evaluation Board has the following features:
•
•
•
•
•
2.2
Evaluation of MCP7386X devices in 4 x 4, 16-lead QFN packages
Simple, stand-alone operation or microcontroller-compatible
Powered from external bench supply or wall cube
Surface-mount design
Fully assembled and tested
GETTING STARTED
The MCP7386X Battery Charger Evaluation Board is a fully-functional, assembled and
tested surface-mount board for evaluation of Microchip’s MCP7386X Advanced Single
or Dual-Cell, Fully Integrated Lithium-Ion/Lithium-Polymer Charge Management
Controllers. The following steps provide simple, stand-alone operation. Refer to
Figure 2-1 for the setup configuration diagram. The setup configuration diagram
depicts evaluation of the installed MCP73861 for single-cell applications.
1. Connect an external bench supply or wall cube to the surface-mount test points
provided. The input voltage source should be in the range of 5V to 12V. Refer to
Section 2.3.1 “Input Source” for details on the input source requirements.
Note:
Observe correct polarity of connection. Positive terminal connects to J2
(VIN+); negative terminal connects to J3 (VIN–).
2. Connect a single-cell Lithium-Ion or Lithium-Polymer battery pack to the circuit
for evaluation.
Note:
Observe correct polarity of connection. Positive terminal connects to J5
(VBAT+); negative terminal connects to J6 (VBAT –).
3. Connect an external battery pack thermistor to the J7 (THERM) input. The
thermistor should be connected from J7 (THERM) to J6 (VBAT –). If continuous
cell temperature monitoring is not desired, place a 10 kΩ resistor from THERM
to VBAT –, or populate R5 with a 10 kΩ resistor.
4. Turn on the bench supply or plug in the wall cube.
5. A green LED (D1) provides status during the charge cycle. A red LED (D2)
indicates a Fault condition. Refer to the MCP73861/2/3/4 data sheet (DS21893)
for details.
© 2006 Microchip Technology Inc.
DS51475C-page 7
MCP7386X Evaluation Board User’s Guide
+ Single
Lithium-Ion
- Cell
Unregulated
Wall Cube
FIGURE 2-1:
2.3
Setup Configuration Diagram.
DETAILED DESCRIPTION
The MCP7386X Battery Charger Evaluation Board is set up to evaluate simple,
stand-alone, linear charging of single/dual-cell Lithium-Ion/Lithium-Polymer battery
packs. The reference design provides constant current charging, followed by constant
voltage charging with automatic charge termination. As provided, the MCP7386X
Battery Charger Evaluation Board is set for a fast charge, constant current level of
1.2A, typical for single-cell applications. The MCP73861 is provided in a 4 x 4, 16-lead
QFN package and is equipped with shutdown control, status indicator, fault indicator,
safety timer and a continuous cell temperature monitor. For dual-cell applications, the
MCP73862 or MCP73864 can be substituted for the MCP73861. Refer to the
MCP73861/2/3/4 data sheet (DS21893) for details on the individual device features.
2.3.1
Input Source
The MCP7386X Battery Charger Evaluation Board is designed to provide a fast charge
current of 1.2A, typical. The input source should provide a voltage in the range of 5V to
12V. The input source should be capable of providing a minimum of 7.5W.
Lower peak currents can be obtained by adjusting the value of the charge programming
resistors (R2). A corresponding lower-power input source may then be utilized. Refer
to the MCP73861/2/3/4 data sheet (DS21893) for details on determining the
appropriate programming resistor.
2.3.2
Safety Timer Periods
The MCP7386X Battery Charger Evaluation Board can be used with a variety of battery
packs. As provided, the MCP7386X Battery Charger Evaluation Board is set up to
perform well with single-cell, 1000 mAh battery packs. Battery packs with alternative
capacities and various charge currents can be implemented. The safety timer periods
may need to be adjusted in order to ensure a full charge. The safety timer periods can
be adjusted by changing the capacitance of C3. Refer to the MCP73861/2/3/4 data
sheet (DS21893) for details on determining the appropriate timer capacitance.
2.3.3
Disable Control
The MCP7386X Battery Charger Evaluation Board is designed to provide stand-alone
operation. The installed MCP73861 device is enabled whenever the input source is
present. To disable charging, a jumper can be placed between J1, EN and J3 (VIN–).
DS51475C-page 8
© 2006 Microchip Technology Inc.
Installation and Operation
2.3.4
Battery Headers
Independent battery connections are provided. The battery pack positive terminal
should be connected to J5 (VBAT+). The battery pack negative terminal should be
connected to J6 (VBAT –). In addition, a connection is provided for a nominal 10 kΩ at
+25°C NTC thermistor, situated in the battery pack for temperature sensing. When the
cell temperature is between -5°C and +55°C, installed resistors provide a charging
window when a thermistor with a sensitivity index (β) of 3982 is utilized. Charging is
inhibited when the cell temperature deviates outside the preset window. The resistor
values can be adjusted to provide the desired charging window for a variety of
thermistors. Refer to the MCP73861/2/3/4 data sheet (DS21893) for details.
Note:
2.3.5
Improper connection of the battery may result in damage to the battery
and increase the possibility of personal injury. It is also important to avoid
shorting the battery terminals together.
Device Support Options
The MCP7386X Battery Charger Evaluation Board supports the entire MCP7386X
family. The MCP7386X Battery Charger Evaluation Board is provided with one
reference design utilizing the MCP73861. Alternate devices can be substituted in
order to evaluate the different MCP7386X family options.
2.3.6
Microcontroller Option
Connection points provide easily-accessible locations for interface to a host
microcontroller. The host microcontroller can be used to disable the charger, monitor
charge status or terminate a charge.
2.3.7
Output Voltage Options
The MCP7386X Battery Charger Evaluation Board is provided with a
Constant-Voltage mode output voltage of 4.2V per cell, the evaluation of which can be
achieved by moving resistor R4 to R3, or by shorting the R3 pads.
© 2006 Microchip Technology Inc.
DS51475C-page 9
MCP7386X Evaluation Board User’s Guide
NOTES:
DS51475C-page 10
© 2006 Microchip Technology Inc.
MCP7386X EVALUATION
BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP7386X
Evaluation Board:
•
•
•
•
Board Schematic
Board – Top Layer
Board – Silk Screen Layer
Board – Bottom Layer
© 2006 Microchip Technology Inc.
DS51475C-page 11
1
DS51475C-page 12
1
1
1
TIMER
J8
EN
J1
VIN-
J3
C3
0.1uF
C1
4.7uF
R1
1.50k
R8
100k
R3
DNP
R4
100k
D2
RED
D1
GREEN
R2
0
2
3
16
15
1
14
8
5
VBAT1
VBAT2
VBAT3
VSS1
VSS2
EXPAD
VSS3
THERM
THREF
MCP73861/QFN(16)
VDD1
VDD2
STAT1
STAT2
VSET
EN
TIMER
PROG
U1
10
11
12
4
13
17
9
7
6
R7
7.32k
R6
6.19k
R5
DNP
C2
4.7uF
PROG
1
J4
THERM
1
J7
VBAT-
1
J6
VBAT+
1
J5
A.2
VIN+
J2
MCP7386X Evaluation Board User’s Guide
BOARD SCHEMATIC
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
© 2006 Microchip Technology Inc.
DS51475C-page 13
MCP7386X Evaluation Board User’s Guide
A.4
BOARD – SILK SCREEN LAYER
DS51475C-page 14
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM LAYER
© 2006 Microchip Technology Inc.
DS51475C-page 15
MCP7386X Evaluation Board User’s Guide
NOTES:
DS51475C-page 16
© 2006 Microchip Technology Inc.
MCP7386X EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
2
BILL OF MATERIALS (BOM)
Designator
Description
Manufacturer
Panasonic®
Part Number
C1, C2
4.7 µF, X5R Ceramic, 16V, 0805
1
C3
0.1 µF, X7R Ceramic, 16V, 0805
Panasonic
ECJ-2VB1C104K
1
D1
Green LED, 0805
Lumex® Opto/
Components Inc.
SML-LXT0805GW
1
D2
Red LED, 0805
Lumex Opto/
Components Inc.
SML-LXT0805SRW
8
J1 - J8
Surface-Mount Test Point, 5016
Keystone®
Electronics
5016
1
R1
1.5 kΩ, 1/8W, Chip Resistor, 0805
Panasonic
ERJ-6GEYJ152V
1
R2
0Ω Jumper, 0805
Panasonic
ERJ-6GEY0R00V
0
R3, R5
DNP, 0805
2
R4, R8
100 kΩ, 1/10W, Chip Resistor, 0805
Panasonic
ERJ-6ENF1003V
1
R6
6.19 kΩ, 1/10W, Chip Resistor, 0805
Panasonic
ERJ-6ENF6191V
1
R7
7.32 kΩ, 1/10W, Chip Resistor, 0805
Panasonic
ERJ-6ENF7321V
1
U1
Single-Cell Lithium-Ion Charger, 4X4QFN16 Microchip
Technology Inc.
Note 1:
ECJ-2FB1C475K
MCP73861-I/MLG
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.
© 2006 Microchip Technology Inc.
DS51475C-page 17
WORLDWIDE SALES AND SERVICE
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07/21/06
DS51475C-page 18
© 2006 Microchip Technology Inc.