MICROCHIP TC1303B User Guide

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TC1303B Dual-Output

Regulator with Power-Good Output

User’ s Guide

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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 St a rt ed ................. ... ............. .. ............. .. .............. .. ............. .. .............. 7

Appendix A. Schematic and Layouts ..........................................................................9

A.1 Introduction ....................................................................................................9

A.2 Board Sche m a t ic ..................... .. .............. .. ............. .. .............. .. ............. .. ... 10

A.3 Board – As se mbly Drawing .................. .............. .. ............. ............. ... ......... 11

A.4 Board – Top Ov e rl a y ............. ............. .. .............. .. ............. .. .............. .. ....... 12

A.5 Board – Top La y er ... ............. .. ............. ... ............. .. ............. .............. .. ....... 13

A.6 Board – Bottom Layer ..... .. .. ............. ............. ... ............. .. ............. ... ......... 14

Appendix B. Bill-Of-Materials (BOM) .........................................................................15

Worldwide Sales and Service ....................................................................................16

TC1303B Dual-Output Regulator User’s Guide

NOTES:

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.

TC1303B Dual-Output Regulator User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only comp ile r...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

Text in angle br ackets < > A key on the keyboard Press <Enter>, <F1>

Courier font:

Plain Courier Sample source code #define START

Italic Courier A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

IDE User’s Guide

“Save project before build”

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

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 ap plications , with one low p rocessor core voltage a nd one hig her 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 t he 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 outpu t 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. T he 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

TC1303B DUAL-OUTPUT

REGULATOR USER’S GUIDE

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)

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 V

-LDO V

- PG Output

- Shutdown V

• The fixed output voltages for the TC1303B can be determined by using the data sheet section titled “Product Ident ifica tion Syste m”. Refer to the TC1303B data sheet (DS21949) for details.

= 0 mA to 500 mA

OUT1

= 0 mA to 300 mA

OUT2

and shutdown V

OUT1

TC1303B DUAL-OUTPUT

REGULATOR USER’S GUIDE

OUT2

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 (+V

2. Connect buck regulator load (0 mA to 500 mA for normal operation) to board test

point TP3 (+V

3. Connect LDO regulator load (0 mA to 300 mA for normal operation) to TP10

(+V

) and TP11 (A

4. The power-good output signal is available on test point TP5 (PG).

5. To shutdown V

(TP11) can be used. This will disable the buck regulator output voltage (the LDO output voltage is not affected).

6. To shutdown V

(TP11) can be used. This will disable the LDO output voltage (the buck regulator output voltage is not affected).

) and TP4 (P

) and TP7 (P

OUT1

OUT2

GND

, a jumper wire from TP8, (SHDN1) to the A

, a jumper wire from TP9 (SHDN2) to the A

GND

test point

GND

test point

TC1303B Dual-Output Regulator User’s Guide

Note: When grounding the shutdown pins, the input voltage is placed across the

1MΩ pull-up resistor. This will cause the input current to increase by a few micro-amps.

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

TC1303B DUAL-OUTPUT

REGULATOR USER’S GUIDE

TC1303B Dual-Output Regulator User’s Guide

A.2 BOARD SCHEMATIC

A.3 BOARD – ASSEMBLY DRAWING

Schematic and Layouts

1.50

0.17

2.10

0.17

TC1303B Dual-Output Regulator User’s Guide

A.4 BOARD – TOP OVERLAY

A.5 BOARD – TOP LAYER

Schematic and Layouts

TC1303B Dual-Output Regulator User’s Guide

A.6 BOARD – BOTTOM LAYER

TC1303B DUAL-OUTPUT

REGULATOR USER’S GUIDE

Appendix B. Bill-Of-Materials (BOM)

TABLE B-1: BILL-OF-MATERIALS (BOM)

Qty. Reference Description Mfgr. Part Number

2 C1, C2 4.7 µF, X7R Ceramic, 6.3V, 0805 Panasonic 2 C4,C6 1 µF, X5R Ceramic, 6.3V, 0603 Panasonic-ECG ECJ-1VB0J105K 1 L1 4.7 µH Surface Mount Inductor Coilcraft 1 U1 TC1303B Dual Output Regulator Microchip

Technology Inc. 3 R2, R3, R4 1M, 1/16W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EKF1004V 9 TP2, TP3, TP4, TP5,

TP7, TP8, TP9, TP10, TP11

PC TEST POINT COMPACT SMT Keystone Electronics

-ECG ECJ-2FB0J475M

1008PS-472KL TC1303B-PG0EMF

5016

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04/20/05

MICROCHIP TC1303B User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE TC1303B DUAL-OUTPUT REGULATOR WITH POWER-GOOD OUTPUT DEMO BOARD?

1.3 WHAT THE TC1303B DUAL-OUTPUT REGULATOR WITH POWER-GOOD OUTPUT DEMO BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

Appendix B. Bill-Of-Materials (BOM)