TC1303 DFN
Adjustable Output
Demo Board
User’s Guide
© 2006 Microchip Technology Inc.
DS51617A
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DS51617A-page ii
© 2006 Microchip Technology Inc.
TC1303 DFN ADJUSTABLE OUTPUT
DEMO 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 TC1303 DFN Adjustable Output Demo Board? .......................... 6
1.3 What the TC1303 DFN Adjustable Output Demo Board Kit includes ............. 6
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 7
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 11
A.2 Board – Schematic ..................................................................................... 12
A.3 Board – Top Silk Screen Layer .................................................................. 13
A.4 Board – Top Metal Layer ............................................................................ 14
A.5 Board – Bottom Metal Layer ...................................................................... 15
Appendix B. Bill Of Materials (BOM)
Worldwide Sales and Service .................................................................................... 18
© 2006 Microchip Technology Inc.
DS51617A-page iii
TC1303 DFN Adjustable Output Demo Board User’s Guide
NOTES:
DS51617A-page iv
© 2006 Microchip Technology Inc.
TC1303 DFN ADJUSTABLE OUTPUT
DEMO 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
TC1303 DFN Adjustable Output 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 TC1303 DFN Adjustable Output Demo Board
. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the TC1303 DFN
Adjustable Output 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. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the TC1303 DFN Adjustable Output Demo Board .
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
TC1303 DFN Adjustable Output Demo Board .
© 2006 Microchip Technology Inc.
DS51617A-page 1
TC1303 DFN Adjustable Output Demo 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 TC1303 DFN Adjustable Output Demo Board.
The following Microchip documents are available and recommended as supplemental
reference resources.
TC1303A/TC1303B/TC1303C Data Sheet, "500mA Synchronous Buck Regulator,
+ 300mA LDO with Power-Good Output" (DS21949)
This data sheet provides detailed information regarding the TC1303 product family.
DS51617A-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
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
In addition, there is a Development Systems Information Line which lists the latest
versions of Microchip's development systems software products. This line also provides information on how customers can receive currently available upgrade kits.
The Development Systems Information Line numbers are:
1-800-755-2345 – United States and most of Canada
1-480-792-7302 – Other International Locations
DOCUMENT REVISION HISTORY
Revision A (July 2006)
• Initial Release of this Document.
© 2006 Microchip Technology Inc.
DS51617A-page 3
TC1303 DFN Adjustable Output Demo Board User’s Guide
NOTES:
DS51617A-page 4
© 2006 Microchip Technology Inc.
TC1303 DFN ADJUSTABLE OUTPUT
DEMO BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
Step-down-converter choices include a variety of linear and switching regulators. The
TC1303C Adjustable Output Regulator provides a unique combination of a 500 mA
synchronous buck regulator and 300 mA Low-Dropout Regulator (LDO) with a
Power-Good (PG) monitor to provide a highly integrated solution of dual supply
applications for devices like Cellular Phones, Portable Computers, USB-Powered
Devices, Hand Held instruments, etc. The device provides a very cost-effective solution
with minimal board space because of the high-frequency operation of the buck
converter, which reduces the size requirements of the external inductor and capacitor,
the minimal external component requirement by the LDO and the small DFN (dual flat
no leads) package size.
The 500 mA synchronous buck regulator switches at a fixed frequency of 2.0 MHz
when the load is heavy, providing a low-noise, small-size solution. When the load on
the buck output is reduced to light levels, it changes operation to a pulse frequency
modulation (PFM) mode to minimize quiescent current drawn from the battery. No intervention is necessary for smooth transition from one mode to another.
The LDO provides a 300 mA auxiliary output that requires a single 1 µF ceramic output
capacitor, minimizing board area and cost. Typical dropout voltage for the LDO output
is 137 mV for a 200 mA load.
For the TC1303C, the power-good output is based on the regulation of the buck regulator output, the LDO output or the combination of both. Additional protection features
include UVLO, overtemperature and overcurrent protection on both outputs.
This chapter covers the following topics.
• What is the TC1303 DFN Adjustable Output Demo Board?
• What the TC1303 DFN Adjustable Output Demo Board Kit includes.
TC1303C
500mA Synchronous Buck
Regulator + 300mA LDO
with Power-Good Output
Resistor Divider
Network
Buck Regulator
Output Voltage
1.8V,2.5V,3.3V,
4.0V @500 mA
LDO Regulator
Output Voltage
2.5V @300 mA
INPUT VOLTAGE:
2.7V - 5.5V
Switch S1 for
SHDN1 and SHDN2
FIGURE 1-1:
© 2006 Microchip Technology Inc.
TC1303 DFN Adjustable Output Demo Board Block Diagram.
DS51617A-page 5
TC1303 DFN Adjustable Output Demo Board User’s Guide
1.2
WHAT IS THE TC1303 DFN ADJUSTABLE OUTPUT DEMO BOARD?
The TC1303 DFN Adjustable Output demo board demonstrates the use of Microchip’s
TC1303C device in applications that require dual supply voltage.The demo board is
used to evaluate the TC1303C device over the input voltage range, output voltage and
current range for both the synchronous buck regulator output and the low dropout linear
regulator output.
Test points are provided to monitor the Input voltage, Output voltage, shut down control
and power good signal.
1.3
WHAT THE TC1303 DFN ADJUSTABLE OUTPUT DEMO BOARD KIT
INCLUDES
This TC1303 DFN Adjustable Output Demo Board kit includes:
• TC1303 DFN Adjustable Output Demo Board (102-00092)
• TC1303 DFN Adjustable Output Demo Board User’s Guide
(Electronic version on CD-ROM)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
DS51617A-page 6
© 2006 Microchip Technology Inc.
TC1303 DFN ADJUSTABLE OUTPUT
DEMO BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The TC1303 DFN Adjustable Output Demo Board demonstrates the use of Microchip's
TC1303C 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good
output device for dual supply voltage applications.
2.2
FEATURES
TheTC1303 DFN Adjustable Output Demo Board has the following features.
• Test points for applying Input voltage (2.7V to 5.5V)
• Using Potentiometer, one can set the Buck regulator output voltage from 1.8V to
4.0V
• Fixed LDO regulator output voltage of 2.5V
• Test points for connecting external loads:
- Buck regulator Output VOUT1 = 0 mA to 500 mA
- LDO regulator Output VOUT2 = 0 mA to 300 mA
• Test points for monitoring:
- Power-Good Output for both VOUT1 and VOUT2
- Shutdown for VOUT1 and Shutdown for VOUT2
- Feedback voltage
• Switch S1 can used to perform the shutdown operation on VOUT1 and VOUT2
2.3
GETTING STARTED
The TC1303 DFN Adjustable Output Demo Board is fully assembled and tested for
evaluating the TC1303C device. The board requires the use of an external input voltage source of (2.7V to 5.5V) and maximum external load of 500 mA for buck regulator
output and 300 mA for LDO regulator output.
2.3.1
Power Input and Output Connection
2.3.1.1
POWERING THE TC1303 DFN ADJUSTABLE OUTPUT DEMO BOARD
For normal operation, it is necessary to pull up the shutdown pins of TC1303C device,
the pull up is provided through switch S1 provided on-board.
1. Apply the Input voltage (2.7V to 5.5V for normal operation) to the board test
points to TP1 (+VIN) and TP2 (PGND) (refer to Figure 2-1).
2. Connect the buck regulator load (0 mA to 500 mA for normal operation) to the
board test points TP3 (VOUT1) and TP4 (PGND).The output voltage can be varied
from 1.8V to 4.0V using the potentiometer provided on-board. By turning the
potentiometer clockwise or counterclockwise, the voltage can be increased or
decreased within the 1.8V to 4.0V range.
3. Connect the LDO regulator load (0 mA to 300 mA for normal operation) to test
point TP6 (VOUT2) and TP10 (AGND). The LDO regulator provides a fixed output
voltage of 2.5V.
© 2006 Microchip Technology Inc.
DS51617A-page 7
TC1303 DFN Adjustable Output Demo Board User’s Guide
4. The power-good output signal is available on the test point TP5 (PG).
5. The switch S1, position 1 and position 2 are used to determine the SHDN1 and
SHDN2 modes for the TC1303C device.
6. With switch S1, position 1 pushed to the right, the SHDN1 pin is pulled up and
the output VOUT1 of the TC1303C device is enabled. When switch S1, position 1
is to the left, the TC1303C device is in low quiescent current SHDN1 mode and
the output VOUT1 is disabled. The signal is available on test point TP8.
7. Similarly with switch S1, position 2 pushed to the right, the SHDN2 pin is pulled
up and the output VOUT2 of the TC1303C device is enabled. When switch S1,
position 2 is to the left, the TC1303C device is in low quiescent current SHDN2
mode and the output VOUT2 is disabled. The signal is available on test point TP7.
FIGURE 2-1:
DS51617A-page 8
Setup Configuration Diagram
© 2006 Microchip Technology Inc.
Installation and Operation
2.3.1.2
APPLYING LOAD TO TC1303 DFN ADJUSTABLE OUTPUT DEMO
BOARD
A variable resistive load can be used to verify the line and load regulation. The load
resistance is connected between the points TP3 and TP4 for the buck regulator. To
measure the output voltage, connect the common point of multi-meter to TP4 and the
positive terminal to TP3. By varying the load one can verify the load regulation by
measuring the output voltage over entire load range of 0 mA to 500 mA. Similarly, by
varying the line voltage from 2.7V to 5.5V and checking the output voltage, the line
regulation can be calculated.
The best way to evaluate the TC1303 DFN Adjustable Output Demo Board is to dig into
the circuit. Measure voltages and currents with a DVM and probe the board with an
oscilloscope.
Calculating Adjustable Output Voltage
The buck regulator output voltage is adjustable by using two external resistors as a
voltage divider. For adjustable-output voltages, it is recommended that the top resistor
divider value be 200 kohm. The bottom resistor can be calculated using the following
formula.
EQUATION 2-1:
V FB
⎛
⎞
R BOT = R TOP × ⎜ ------------------------------------- ⎟
⎝ V OUT1 – V FB ⎠
Where:
RTOP
=
Top resistor (200 kohm)
VOUT1
=
Output Voltage
VFB
=
0.8V
RBOT
=
Bottom resistor
Example
For setting the output voltage to 3.2V.
EQUATION 2-2:
0.8V
R BOT = 200 kohm × ⎛ ----------------------------- ⎞
⎝ 3.2V – 0.8V ⎠
= 66.66 kohm
Where:
RTOP
=
200 kohm
VOUT1
=
3.2V
VFB
=
0.8V
The RBOT resistor can be set using the potentiometer (R7) provided on board so as to
provide an output voltage of 3.2V.
© 2006 Microchip Technology Inc.
DS51617A-page 9
TC1303 DFN Adjustable Output Demo Board User’s Guide
NOTES:
DS51617A-page 10
© 2006 Microchip Technology Inc.
TC1303 DFN ADJUSTABLE OUTPUT
DEMO BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the TC1303 DFN
Adjustable Output Demo board:
•
•
•
•
Board – Schematic
Board – Top Silk Screen Layer
Board – Top Metal Layer
Board – Bottom Metal Layer
© 2006 Microchip Technology Inc.
DS51617A-page 11
TC1303 DFN Adjustable Output Demo Board User’s Guide
A.2
BOARD – SCHEMATIC
DS51617A-page 12
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP SILK SCREEN LAYER
© 2006 Microchip Technology Inc.
DS51617A-page 13
TC1303 DFN Adjustable Output Demo Board User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51617A-page 14
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM METAL LAYER
© 2006 Microchip Technology Inc.
DS51617A-page 15
TC1303 DFN Adjustable Output Demo Board User’s Guide
NOTES:
DS51617A-page 16
© 2006 Microchip Technology Inc.
TC1303 DFN ADJUSTABLE OUTPUT
DEMO BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
QTY
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
®
Part Number
1
C1
Cap Ceramic 4.7μF 6.3V X5R 0805
1
C2
Cap 10uF 6.3V Ceramic X5R 0805
Panasonic - ECG
ECJ-2FB0J106M
1
C3
Cap 33pF 50V Cerm Chip 0805 SMD
Panasonic - ECG
ECJ-2VC1H330J
2
C4,C5
Cap 1uF 16V Ceramic 0805 X5R
Panasonic - ECG
ECJ-2FB1C105K
1
L1
Inductor power shield 4.7μH
Coiltronics/Div of Cooper/Bussmann
SD3118-4R7-R
3
R1, R2, R3
Res 1.0M Ohm 1/8W 5% 0805 SMD
Panasonic - ECG
ERJ-6GEYJ105V
1
R4
Res 200K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF2003V
1
R5
Res 4.99K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF4991V
1
R6
Res 49.9K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF4992V
1
R7
Trimpot 500K Ohm 11 Trn 5mm Top
Murata Electronics®
North America
PVG5A504C01R00
1
S1
Switch Dip 2 Pos half pitch SMT
ITT Industries / C&K Div
TDA02H0SK1
Keystone®
5016
10
TP1, TP2, TP3, PC Test point compact SMT
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10
1
U1
Panasonic - ECG
Electronics
IC PWM 500mA/ LDO 300mA 10 DFN Microchip Technology Inc
© 2006 Microchip Technology Inc.
ECJ-2FB0J475K
TC1303C-ZI0EMF
DS51617A-page 17
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Tel: 886-3-572-9526
Fax: 886-3-572-6459
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
San Jose
Mountain View, CA
Tel: 650-215-1444
Fax: 650-961-0286
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
DS51617A-page 18
06/08/06
© 2006 Microchip Technology Inc.