Note the following details of the code protection feature on Microchip devices:
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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
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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
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INTRODUCTION
This chapter contains general information that will be useful to know before using the
TC110 Boost Converter Demo 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 TC110 Boost Converter Demo 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 TC110 Boost
Converter Demo 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. “Schematics and Layouts” – Shows the schematic and layout
diagrams for the TC110 Boost Converter Demo Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the TC110
Boost Converter Demo Board.
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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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
The TC110 Boost Converter Demo Board can charge Li-Ion Batteries with single-cell
Alkaline battery or 2-cell Alkaline battery at maximum 500 mA constant current. The
TC110 Boost Converter Demo Board is used to evaluate Microchip’s TC110 PFM/PWM
Step-Up DC/DC Controller. The TC110 is a step-up (Boost) switching controller that
can regulate output voltage with a typical start-up voltage of 0.9V. The TC110 Boost
Converter Demo Board also includes a MCP73832 Miniature Single-Cell, Fully
Integrated Li-Ion, Li-Polymer Charge Management Controllers. Microchip’s MCP73832
is a highly advanced linear charge management controllers for use in space-limited,
cost-sensitive applications. The TC110 Boost Converter Demo Board is a ready to use
solution for portable applications when no DC plug is available. The TC110 Boost Converter Demo Board can efficiently transfer energy from Alkaline batteries to Li-Ion
battery pack.
This chapter covers the following topics:
• What is the TC110 Boost Converter Demo Board?
• What the TC110 Boost Converter Demo Board Kit includes.
TC110 BOOST CONVERTER
DEMO BOARD USER’S GUIDE
FIGURE 1-1:TC110 Boost Converter Demo Board System Level Block
Diagram.
The TC110 Boost Converter Demo Board demonstrates the use of a PFM/PWM
Step-Up DC/DC Controller (TC110) to supply input voltage for a Miniature Single-Cell,
Fully Integrated Li-Ion, Li-Polymer Charge Management controller (MCP73832) that
charges a Li-Ion Battery from 1-Cell or 2-Cell Alkaline batteries.
The TC110 Boost Converter Demo Board is setup to evaluate simple dc-to-dc conversion while demonstrating the potential integration into a portable battery charger application.The TC110 Boost Converter Demo Board charges Li-Ion battery at constant
current of 200 mA for single Alkaline application set-up. However, the charge current
can be programmed up to 500 mA by changing a resistor value. This demo board is
designed to be able to select between 1-cell Alkaline battery and 2-cell Alkaline battery
using a single switch.
The TC110 Boost Converter Demo Board utilizes Microchip's TC110 (PFM/PWM
Step-Up DC/DC Controller) with the MCP73832 (Miniature Single-Cell Integrated
Li-Ion, Li-Polymer Charge Management Controller) that effectively transfers the energy
from 1-cell or 2-cell Alkaline battery source to a single-cell Li-Ion battery.
The additional test probes can connect to DC source and loads directly for bench
testings.
1.3WHAT THE TC110 DEMO BOARD KIT INCLUDES
This TC110 Boost Converter Demo Board kit includes:
• TC110 Boost Converter Demo Board (102-00122)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
The TC110 Boost Converter Demo Board demonstrates Microchip's 0.9V start-up
PFM/PWM Step-Up DC/DC Controller. A single cell Alkaline battery operates between
0.9V to 1.5V. Thus, the TC1 10 is a good Boost converter for applications that run from
1-cell or 2-cell Alkaline batteries. The TC110 is a Boost switching controller that
provides output current of up to 300 mA with a typical efficiency of 84%. The TC110
Boost Converter Demo Board normally operates in pulse width modulation (PWM)
mode, but automatically switches to pulse frequency modulation (PFM) mode at low
output loads for higher efficiency.
The MCP73832 employs a constant-current/constant-voltage algorithm with selectable
preconditioning and charge termination. Both constant-current and constant-voltage
features will be reviewed in the section 2.2.
The TC110 Boost Converter Demo Board has built-in mechanical switches to turn off
and select voltage source between 1-cell Alkaline or 2-cell Alkaline batteries.
TC110 BOOST CONVERTER
DEMO BOARD USER’S GUIDE
2.2FEATURES
The TC110 Boost Converter Demo Board has the following features:
• Single-Cell Li-Ion Battery Charger, operates stand-alone without firmware added
• Charges 1-cell Li-Ion battery pack from 0.9V to 3.0V Input (Battery types from
• Regulates output dc voltage to 5.0V. (TC110 Output voltages available in 3.0V,
• 300 kHz fixed frequency (TC110 is available in 100 kHz and 300 kHz fixed
• ON/OFF button used to enable and disable system
• 3-position toggle switch to select single, dual battery input or disable
• LED ON/OFF to show the charging activity and standby mode
• Easy adjust constant charging current with single resistor modification (The
• MCP73832 is used to charge Li-Ion battery pack at constant voltage (The
• TC110 Boost Converter Demo Board operates directly from single cell AA battery
• Ready to use design or simple modification to support various new portable
for economic and fast pace design cycle
1-cell to 2-cell Alkaline batteries or similar rating NiCd and NiMH)
3.3V, and 5V)
frequency)
default current is 200 mA to optimize 1-cell Alkaline battery, but can go up to
500 mA for fast charging cycle while running in 2-cell Alkaline battery
MCP73832 is available in 4.20V, 4.35V, 4.40V, or 4.50V fixed voltage rating to
accommodate emerging battery charging requirements)
The TC110 Boost Converter Demo Board is fully assembled and tested for generating
a regulated 5V output voltage from TC110 from a 0.9V to 3V input voltage source while
charging Li-Ion battery pack at constant current up to 500 mA.
2.3.1Power Input and Output Connection
2.3.1.1POWERING THE TC110 BOOST CONVERTER DEMO BOARD
1. Insert the AA Alkaline batteries into battery holders. Brand new Alkaline batteries
are recommended to use for each charge.
2. Connect the positive side of the Li-Ion battery pack voltage to TP8 VBAT, connect
the battery pack return to the TP7 GND.
3. Turn on the TC1 10 Boost Converter Demo Board by moving dip switch toward
Microchip logo. Once the switch is turned on, the TC110 Boost Converter Demo
Board is powered. When powered, adjusting toggle switch position can select
between 1-cell or 2-cell Alkaline battery source. The charging cycle is disabled,
if the switch is keep in OFF position.
4. LED D2 will be illuminated when the charging cycle running.
5. LED D2 blinks when the system is on without Li-Ion battery pack (or load)
present.
6. During normal operation of the TC1 10 Boost Converter Demo Board, the system
can switch between both input sources or pause by adjusting the toggle switch
position.
2.3.1.2APPLYING BATTERY TO TC110 BOOST CONVERTER DEMO BOARD
A 1-cell Li-Ion battery pack shall be connected to the VBAT and GND connectors before
applying input power and turn on S1 and S2 to start the charging cycle. Once the
system starts charging cycle, V
Bat (TP2) are test points that used to measure the battery voltage from Alkaline
batteries (A good Alkaline battery should rate between 0.9V to 1.5V).
2.3.1.3LED STATUS INDICATION
The LED is connected between VBAT and STAT pins to demonstrate the charging
activity. The LED illuminates when the charging cycle begins (battery pack presents,
S1 and S2 are in the ON mode). The LED blinks when no load is present, and remain
off when S1 or S2 are disable or OFF.
2.3.1.4ADJUST CONSTANT CHARGING CURRENT
The TC110 Boost Converter Demo Board is designed to operate with 200 mA constant
current. However, it can be easily programmed to operate with various constant charging current by changing the value of R3. As shown in Figure 2-2, the constant programmed current can go up to 500 mA for fast charge by applying 2 kΩ resistor to R3.
Therefore, the constant charging current can easily be adjusted from selecting different
resistor values.
(TP4) is a constant 5V, 2-cell Bat (TP1) and 1-cell