MCP73837/8
AC/USB
Dual Input Battery Charger
Evaluation Board
User’s Guide
© 2007 Microchip Technology Inc.
DS51684A
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© 2007 Microchip Technology Inc.
DS51684A-page ii
MCP73837/8 AC/USB 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 MCP73837/8 AC/USB Dual Input Battery Charger Evaluation
Board? ...................................................................................................... 6
1.3 What the MCP73837/8 AC/USB Dual Input 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 – Top Layer ....................................................................................... 13
A.4 Board – Top Metal Layer ............................................................................. 14
A.5 Board – Bottom Layer ................................................................................. 15
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 18
© 2007 Microchip Technology Inc.
DS51684A-page iii
MCP73837/8 AC/USB Evaluation Board User’s Guide
NOTES:
DS51684A-page iv
© 2007 Microchip Technology Inc.
MCP73837/8 AC/USB 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
MCP73837/8 AC/USB Dual Input 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 MCP73837/8 AC/USB Dual Input Battery
Charger Evaluation Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP73837/8
AC/USB Dual Input 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 MCP73837/8 AC/USB Dual Input Battery Charger Evaluation
Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board.
© 2007 Microchip Technology Inc.
DS51684A-page 1
MCP73837/8 AC/USB 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 MCP73837/8 AC/USB Dual Input Battery
Charger Evaluation Board. Other useful documents are listed below. The following
Microchip documents are available and recommended as supplemental reference
resources.
MCP73837/8 Data Sheet, “Advanced Stand-Alone Li-Ion / Li-Polymer Battery
Charge Management Controller with Autonomous AC-Adapter or USB-Port
Source Selection”, DS22071
This data sheet provides detailed information regarding the MCP73837/8 product
family.
DS51684A-page 2
© 2007 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
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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
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 (December 2007)
• Initial Release of this Document.
© 2007 Microchip Technology Inc.
DS51684A-page 3
MCP73837/8 AC/USB Evaluation Board User’s Guide
NOTES:
DS51684A-page 4
© 2007 Microchip Technology Inc.
MCP73837/8 AC/USB EVALUATION
BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board demonstrates
the features and abilities of Microchip’s MCP73837 and MCP73838 Single-Chip Linear
Li-Ion Battery Charger with Autonomous AC Adapter or USB-Port Power Source
Selection. The MCP73837 and MCP73838 are stand-alone highly integrated linear
battery charger management controllers which employ a constant current / constant
voltage (CCCV) charge algorithm with selectable preconditioning and charge
termination ratio.
The MCP73837 and MCP73838 automatically select the AC-Adapter or USB-Port as
the power source for the system. For an AC-Adapter powered system, an external
resistor (RPROG) sets the magnitude of the charge current up to a maximum of 1000
mA. With an USB-port providing power to the system, the MCP73837/8 specifically
adheres to the current limits governed by the USB specification. The host microcontroller can select from two preset charge current rates of typical 90 mA (low) or 450 mA
(High) and will 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 MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board?
• What the MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board Kit
includes.
VIN_AC Adapter
1
4.7 µF
2
VIN_USB Port
VAC
VUSB
VBAT
THERM
10
Thermistor
9
4.7 µF
Single
Li-Ion
Cell
4.7 µF
3
VIN_AC or USB
VIN_AC or USB
© 2007 Microchip Technology Inc.
PG
8
VIN_AC or USB
4
5
FIGURE 1-1:
STAT1
STAT2
PROG2
7
VSS
PROG1
6
Low
Hi
MCP73837 Typical Application.
DS51684A-page 5
MCP73837/8 AC/USB Evaluation Board User’s Guide
1.2
WHAT IS THE MCP73837/8 AC/USB DUAL INPUT BATTERY CHARGER
EVALUATION BOARD?
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board demonstrates
the use of Single-Chip Linear Li-Ion Battery Charger with Autonomous AC-Adapter or
USB-Port Power Source Selection.
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board is set up to
evaluate single-cell Li-Ion Battery Charge Management. This board utilizes Microchip's
MCP73837 and MCP73838 (Li-Ion Battery Charge Management Controllers) that
effectively charge Li-Ion batteries with +0.5% high accuracy preset voltage regulation.
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board comes with
two pre-installed circuits: DFN-10 MCP73837 and MSOP-10 MCP73838. Both circuits
are ready to charge Li-Ion battery at a maximum charge current rate up to 1000 mA
when AC Adapter is present and a maximum charge current rate up to 500 mA when
USB-Port is present. A mechanical dip switch is built in to select High (maximum
500 mA) or Low (maximum 100 mA) for the USB-Port powered system.
Two built-in LEDs are ready to indicate charge status: STAT1 and STAT2. The
MCP73837 has a Power-Good Monitor that can be observed via the 3rd LED indicator
on the board.
Note:
Please refer to Table 2-1 for MCP73837/8 Charge Status Outputs.
The MCP73838 has Timer-Enable to active and disable the internal safety timer for
charge special applications which can be selected from TE test point pin.
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board is also
designed for easy modifications to support both MCP73837 in 10-pin DFN and MSOP
packages and MCP73838 in 10-pin DFN and MSOP packages. RPROG (R6 and R12)
are located in the open area for quick charge current programming.
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board is designed to
observe the performance and features on the circuits via multiple test points. Users can
also discover the compact size of the layout in addition to the device itself. The circuit
can also be implemented into suitable applications without additional work.
1.3
WHAT THE MCP73837/8 AC/USB DUAL INPUT BATTERY CHARGER
EVALUATION BOARD KIT INCLUDES
This MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board kit includes:
• MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board, 102-00120
• MCP73837 DFN-10 and MCP73838 MSOP-10 (Pre-Installed)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
- MCP73837/8 AC/USB Evaluation Board User’s Guide, DS51684
DS51684A-page 6
© 2007 Microchip Technology Inc.
MCP73837/8 AC/USB EVALUATION
BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board demonstrates
Microchip's stand-alone Linear Li-Ion Battery Chargers - MCP73837 and MCP73838.
The MCP73837 device features a Power-Good Monitor while the MCP73838 device
uses the same pin for the Timer-Enable function.
The MCP73837/8 require only minimum components to implement a complete battery
charge management circuit. The MCP73837/8 are designed to select AC-Adapter or
USB-Port Power Source automatically where AC-Adapter provides the charge current
when both sources are present.
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board comes with a
10-pin DFN MCP73837 and a 10-pin MSOP MCP73838 pre-installed. The different
packages can be easily evaluated by replacing the device, a resistor and a LED where
the patterns have been pre-designed on the board layout.
Typical applications for the MCP73837/8 devices are Smart Phones, PDA, Portable
Media Players, MP3 Players, USB-Powered Systems, Digital Cameras, Handheld
Medical Instruments, Handheld Devices, Battery Chargers, Bluetooth headsets,
Ultra-Mobile PC and Portable Communicators.
2.2
FEATURES
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board has the
following features:
•
•
•
•
•
•
•
DFN-10 and MSOP-10 package patterns for either MCP73837 or MCP73838
1000 mA maximum charge current for AC-Adapter Input Power
100 mA (low) and 500 mA (high) for USB-Port Input Power
VAC provides when both inputs are present at the same time
Two status LEDs to indicate charge status
Additional LED to indicate Power-Good (PG) (Available only for MCP73837)
Timer Enable (TE) Test Point to enable/disable safety timer
(Available only for MCP73838)
• 2-position Dip Switch for USB charge current control High and Low
• Available THERM pin on the board for temperature monitoring with a thermister
© 2007 Microchip Technology Inc.
DS51684A-page 7
MCP73837/8 AC/USB Evaluation Board User’s Guide
2.3
GETTING STARTED
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board is fully
assembled and tested for charging a single-cell Li-Ion or Li-Polymer battery with a
regulated 5V AC-Adapter or USB-Port.
2.3.1
Power Input and Output Connection
2.3.1.1
POWERING THE MCP73837/8 AC/USB DUAL INPUT 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 GND.
3. Connect the 5V DC power supply Positive Terminal to VAC for AC-Adapter Power
Source.
4. Connect the DC power supply Negative Terminal to GND.
5. Connect the 5V DC power supply Positive Terminal to VUSB for USB-Port Power
Source.
6. It should initiate the battery charging cycle when either power source is present.
When both power sources are present, the AC-Adapter Power Source will
provide the input power.
7. Position the DIP Switch high for maximum up to 500 mA charge rate and low for
maximum up to 100 mA charging rate. Charging current should be able to read
off multi-meter that is in series with battery.
Note:
The battery can be replaced with test circuit or electronic load that can sink
current with DC power supply.
Charge Current (mA)
8. For MCP73838, TE pull low to enable the internal safety timer while high to
disable the internal safety timer.
9. Fast Charge Current can be programmed with various resistors that based on
the Figure 2-1.
1000
900
800
700
600
500
400
300
200
100
0
1
1
3
5
7
9
11
13
15
17
19
Programming Resistor (k:)
FIGURE 2-1:
DS51684A-page 8
Charge Current (IOUT) vs. Programming Resistor (RPROG).
© 2007 Microchip Technology Inc.
Installation and Operation
1
FIGURE 2-2:
TABLE 2-1:
Board Top Assembly.
MCP73837/8 CHARGE STATUS OUTPUTS
CHARGE CYCLE STATE
STAT1
GREEN
STAT2
YELLOW
PG
RED
Hi-Z
Shutdown
Hi-Z
Hi-Z
Standby
Hi-Z
Hi-Z
L
L
Hi-Z
L
Precondition
Constant Current Fast Charge
L
Hi-Z
L
Constant Voltage
L
Hi-Z
L
Charge Complete - Standby
Hi-Z
L
L
Temperature Fault
Hi-Z
Hi-Z
L
System Test Mode
L
L
L
Note:
© 2007 Microchip Technology Inc.
Power-Good (PG) option is only available on MCP73837. The PG option is
an open-drain output. The PG is low whenever the input to the MCP73837
is above the UVLO (Undervoltage Lockout) threshold and greater than the
battery voltage.
DS51684A-page 9
MCP73837/8 AC/USB Evaluation Board User’s Guide
NOTES:
DS51684A-page 10
© 2007 Microchip Technology Inc.
MCP73837/8 AC/USB EVALUATION
BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
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 schematics and
board layouts may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP73837/8
AC/USB Dual Input Battery Charger Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Metal Layer
Board – Bottom Layer
© 2007 Microchip Technology Inc.
DS51684A-page 11
MCP73837/8 AC/USB Evaluation Board User’s Guide
BOARD – SCHEMATIC
M
A.2
DS51684A-page 12
© 2007 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
© 2007 Microchip Technology Inc.
DS51684A-page 13
MCP73837/8 AC/USB Evaluation Board User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51684A-page 14
© 2007 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM LAYER
© 2007 Microchip Technology Inc.
DS51684A-page 15
MCP73837/8 AC/USB Evaluation Board User’s Guide
NOTES:
DS51684A-page 16
© 2007 Microchip Technology Inc.
MCP73837/8 AC/USB EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
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 the Bill Of Materials may
differ from those in this document. Please refer to our web site (www.microchip.com) to
obtain the latest documentation available.
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
3M
Part Number
4
Bump
BUMPON HEMISPHERE .44X.20
WHITE
SJ5003-9-ND
6
C1, C2, C3, C4,
C5, C6
CAP CERAMIC 4.7 μF 6.3V X5R 0805 Panasonic® - ECG
2
D1, D5
LED SUPER GREEN 0603 SMD
Para Light Corp. (USA)
L-C191KGCT-U1
2
D2, D6
LED SUPER YELLOW 0603 SMD
Para Light Corp. (USA)
L-C191KYCT-U1
1
D3
LED SUPER RED CLEAR 0603 SMD Para Light Corp. (USA)
L-C191KRCT-U1
Semiconductor®
ECJ-GVB0J475M
2
D7, D8
DIODE SWITCH DUAL CC 50V
SOT23
On
1
---
Printed Circuit Board
—
104-00161-R1
8
R1, R2, R5, R6,
R8, R9, R11,
R12
RES 1K OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1001V
2
R3, R13
RES 1.54K OHM 1/10W 1% 0603
SMD
Panasonic - ECG
ERJ-3EKF1541V
2
R4, R14
RES 69.8K OHM 1/10W 1% 0603
SMD
Panasonic - ECG
ERJ-3EKF6982V
2
R7, R10
RES 10K OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1002V
1
SW1, SW2
SWITCH SLIDE SPDT SMD J-LEAD
COPAL ELECTRONICS
INC
CJS-1200TA
12
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10, TP11,
TP12
PC Test Point Compact SMT
Keystone Electronics®
5016
1
U1
Single-Chip Linear Li-Ion Battery
Charger with Autonomous USB-Port
Microchip Technology, Inc MCP73837-FC/MF
1
U2
Single-Chip Linear Li-Ion Battery
Charger with Autonomous USB-Port
Microchip Technology, Inc MCP73838-FC/UN
Note:
BAV74LT1G
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.
© 2007 Microchip Technology Inc.
DS51684A-page 17
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Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Fuzhou
Tel: 86-591-8750-3506
Fax: 86-591-8750-3521
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
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 - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
10/05/07
DS51684A-page 18
© 2007 Microchip Technology Inc.