TC1303B Dual-Output
Regulator with Power-Good Output
User’s Guide
© 2005 Microchip Technology Inc.
DS51563A
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DS51563A-page ii
© 2005 Microchip Technology Inc.
TC1303B DUAL-OUTPUT
REGULATOR USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 5
1.2 What is the TC1303B Dual-Output Regulator with Power-Good
Output Demo Board? ..................................................................................... 6
1.3 What the TC1303B Dual-Output Regulator with Power-Good
Output Demo Board kit includes .................................................................... 6
Chapter 2. Installation and Operation
2.4 Introduction ..................................................................................................... 7
2.5 Features ......................................................................................................... 7
2.6 Getting Started ............................................................................................... 7
Appendix A. Schematic and Layouts .......................................................................... 9
A.1 Introduction .................................................................................................... 9
A.2 Board Schematic ........................................................................................ 10
A.3 Board – Assembly Drawing ........................................................................ 11
A.4 Board – Top Overlay .................................................................................. 12
A.5 Board – Top Layer ..................................................................................... 13
A.6 Board – Bottom Layer
.............................................................................. 14
Appendix B. Bill-Of-Materials (BOM) ......................................................................... 15
Worldwide Sales and Service .................................................................................... 16
© 2005 Microchip Technology Inc.
DS51563A-page iii
TC1303B Dual-Output Regulator User’s Guide
NOTES:
DS51563A-page iv
© 2005 Microchip Technology Inc.
TC1303B DUAL-OUTPUT
REGULATOR 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
TC1303B Dual-Output Regulator with Power-Good Output Demo Board. Items
discussed in this chapter include:
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Recommended Reading
The Microchip Web Site
Customer Support
IDocument Revision History
DOCUMENT LAYOUT
This document describes how to use the TC1303B Dual-Output Regulator with
Power-Good Output Demo Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the TC1303B
Dual-Output Regulator with Power-Good Output Demo Board.
• Chapter 2. “Installation and Operation” – Provides a description of the demo
board and includes instructions on how to get started.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the TC1303B Dual-Output Regulator with Power-Good Output Demo
Board.
• Appendix B. “Bill-Of-Materials (BOM)” – Lists the parts used to build the
TC1303B Dual-Output Regulator with Power-Good Output Demo Board.
© 2005 Microchip Technology Inc.
DS51563A-page 1
TC1303B Dual-Output Regulator 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
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 font:
Plain Courier
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 TC1303B Dual-Output Regulator with
Power-Good Output Demo Board. The following Microchip document is available and
recommended as a supplemental reference resources.
TC1303B Data Sheet, “500 mA Synchronous Buck Regulator + 300 mA LDO with
Power-Good Output”, (DS21949)
This data sheet provides detailed information regarding the TC1303B product family.
DS51563A-page 2
© 2005 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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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
IDOCUMENT REVISION HISTORY
Revision A (June 2005)
• Initial Release of this Document.
© 2005 Microchip Technology Inc.
DS51563A-page 3
TC1303B Dual-Output Regulator User’s Guide
NOTES:
DS51563A-page 4
© 2005 Microchip Technology Inc.
TC1303B DUAL-OUTPUT
REGULATOR USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The TC1303B Dual-Output Regulator with Power-Good Output Demo Board is used to
demonstrate the operation of the TC1303B. The TC1303B combines a 500 mA
synchronous buck regulator and 300 mA Low-Dropout Regulator (LDO) with a
power-good monitor to provide a highly integrated solution for devices that require
multiple supply voltages. The unique combination of an integrated buck switching
regulator and low-dropout linear regulator provides the smallest, lowest system cost for
dual-output voltage applications, with one low processor core voltage and one higher
bias voltage.
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 solution. When the load on the buck
output is reduced to light levels, it changes operation to a pulse frequency modulation
mode to minimize quiescent current draw 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 TC1303B, the power-good output logic level is based on the regulation of the
LDO output only. The buck regulator can be turned on and off without affecting the
power-good signal.
This chapter covers the following topics:
• What is the TC1303B Dual-Output Regulator with Power-Good Output Demo
Board?
• What the TC1303B Dual-Output Regulator with Power-Good Output Demo Board
kit includes
© 2005 Microchip Technology Inc.
DS51563A-page 5
TC1303B Dual-Output Regulator User’s Guide
1.2
WHAT IS THE TC1303B DUAL-OUTPUT REGULATOR WITH POWER-GOOD
OUTPUT DEMO BOARD?
The TC1303B Dual-Output Regulator with Power-Good Output Demo Board can be
used to evaluate the TC1303B device over the input voltage range and output current
range for both the synchronous buck regulator output and the low-dropout linear
regulator output.
Test points are provided for input power, output loads, shutdown control and
power-good monitoring.
1.3
WHAT THE TC1303B DUAL-OUTPUT REGULATOR WITH POWER-GOOD
OUTPUT DEMO BOARD KIT INCLUDES
This TC1303B Dual-Output Regulator with Power-Good Output Demo Board kit
includes:
• The TC1303B Dual-Output Regulator with Power-Good Output Demo Board
Board (102-00055)
• TC1303B 500 mA Buck Regulator, 300 mA LDO with Power-Good Output Demo
Board User’s Guide (DS51563)
• TC1303B Data Sheet, “500 mA Synchronous Buck Regulator, + 300 mA LDO with
Power-Good Output”, (DS21949)
DS51563A-page 6
© 2005 Microchip Technology Inc.
TC1303B DUAL-OUTPUT
REGULATOR USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The TC1303B Dual-Output Regulator with Power-Good Output Demo Board
demonstrates Microchip’s TC1303B Dual Output Voltage Regulator over its entire
range of operation.
2.2
FEATURES
The TC1303B Dual-Output Regulator with Power-Good Output Demo Board has the
following features:
• Test points for applying input voltage (0V to 5.5V)
• Test points for connecting external loads
- Buck VOUT1 = 0 mA to 500 mA
- LDO VOUT2 = 0 mA to 300 mA
- PG Output
- Shutdown VOUT1 and shutdown VOUT2
• The fixed output voltages for the TC1303B can be determined by using the data
sheet section titled “Product Identification System”. Refer to the TC1303B data
sheet (DS21949) for details.
2.3
GETTING STARTED
The TC1303B Dual-Output Regulator with Power-Good Output Demo Board is fully
assembled and tested for evaluating the TC1303B device operation.
2.3.1
Power Input and Output Connections
2.3.1.1
POWERING THE TC1303B DUAL-OUTPUT REGULATOR WITH
POWER-GOOD OUTPUT DEMO BOARD
For normal operation, it is not necessary to pull up the shutdown pins of the TC1303B
device, pull-up resistors are placed on the board.
1. Apply the input voltage (+2.7V to +5.5V for normal operation) to board test point
TP2 (+VIN) and TP4 (PGND).
2. Connect buck regulator load (0 mA to 500 mA for normal operation) to board test
point TP3 (+VO1) and TP7 (PGND).
3. Connect LDO regulator load (0 mA to 300 mA for normal operation) to TP10
(+VO2) and TP11 (AGND).
4. The power-good output signal is available on test point TP5 (PG).
5. To shutdown VOUT1, a jumper wire from TP8, (SHDN1) to the AGND test point
(TP11) can be used. This will disable the buck regulator output voltage (the LDO
output voltage is not affected).
6. To shutdown VOUT2, a jumper wire from TP9 (SHDN2) to the AGND test point
(TP11) can be used. This will disable the LDO output voltage (the buck regulator
output voltage is not affected).
© 2005 Microchip Technology Inc.
DS51563A-page 7
TC1303B Dual-Output Regulator User’s Guide
Note:
DS51563A-page 8
When grounding the shutdown pins, the input voltage is placed across the
1 MΩ pull-up resistor. This will cause the input current to increase by a few
micro-amps.
© 2005 Microchip Technology Inc.
TC1303B DUAL-OUTPUT
REGULATOR USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematic and layout diagrams for the TC1303B
Dual-Output Regulator with Power-Good Output Demo Board:
•
•
•
•
•
Board Schematic
Board – Assembly Drawing
Board – Top Overlay
Board – Top Layer
Board – Bottom Layer
© 2005 Microchip Technology Inc.
DS51563A-page 9
TC1303B Dual-Output Regulator User’s Guide
A.2
BOARD SCHEMATIC
DS51563A-page 10
© 2005 Microchip Technology Inc.
Schematic and Layouts
BOARD – ASSEMBLY DRAWING
0.17
1.50
M
A.3
0.17
2.10
© 2005 Microchip Technology Inc.
DS51563A-page 11
TC1303B Dual-Output Regulator User’s Guide
A.4
BOARD – TOP OVERLAY
DS51563A-page 12
© 2005 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – TOP LAYER
© 2005 Microchip Technology Inc.
DS51563A-page 13
TC1303B Dual-Output Regulator User’s Guide
A.6
BOARD – BOTTOM LAYER
DS51563A-page 14
© 2005 Microchip Technology Inc.
TC1303B DUAL-OUTPUT
REGULATOR USER’S GUIDE
Appendix B. Bill-Of-Materials (BOM)
TABLE B-1:
Qty.
BILL-OF-MATERIALS (BOM)
Reference
2
2
1
1
C1, C2
C4,C6
L1
U1
3
9
R2, R3, R4
TP2, TP3, TP4, TP5,
TP7, TP8, TP9, TP10,
TP11
© 2005 Microchip Technology Inc.
Description
Mfgr.
®
Panasonic -ECG
Panasonic-ECG
Coilcraft®
Microchip
Technology Inc.
1M, 1/16W, Chip Resistor, 0603
Panasonic-ECG
PC TEST POINT COMPACT SMT Keystone Electronics®
4.7 µF, X7R Ceramic, 6.3V, 0805
1 µF, X5R Ceramic, 6.3V, 0603
4.7 µH Surface Mount Inductor
TC1303B Dual Output Regulator
Part Number
ECJ-2FB0J475M
ECJ-1VB0J105K
1008PS-472KL
TC1303B-PG0EMF
ERJ-3EKF1004V
5016
DS51563A-page 15
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04/20/05
DS51563A-page 16
© 2005 Microchip Technology Inc.