Analog Circuit Design Volume Three: Design Note Collection

1145 Pages·2014·52.47 MB·English

by  Bob Dobkin

Analog Circuit Design
Volume 3
The Design Note Collection
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Analog Circuit Design
Volume 3
The Design Note Collection
E d i t e d b y
Bob Dobkin and
John Hamburger
AMSTERDAM • BOSTON • HEIDELBERG • LONDON • NEW YORK • OXFORD
PARIS • SAN DIEGO • SAN FRANCISO • SINGAPORE • SYDNEY • TOKYO
Newnes
Newnes is an imprint of Elsevier
Newnes is an imprint of Elsevier
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The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UK
First edition 2015
Copyright © 2015, Linear Technology Corporation. Published by Elsevier Inc. All rights reserved.
See separate Publisher’s Note for copyright details of Trade Marks used in this book.
The right of Linear Technology Corporation to be identified as the author of this work has been asserted in
accordance with the Copyright, Designs and Patents Act 1988.
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No responsibility is assumed by the publisher or authors/contributors for any injury and/or damage to persons
or property as a matter of products liability, negligence or otherwise, or from any use or operation of any meth-
ods, products, instructions or ideas contained in the material herein. Because of rapid advances in the medical
sciences, in particular, independent verification of diagnoses and drug dosages should be made.
Library of Congress Cataloging-in-Publication Data
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A catalogue record for this book is available from the British Library
ISBN: 978-0-12-800001-4
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14 15 16 17 18 10 9 8 7 6 5 4 3 2 1
Cover photo by Anne Hamersky
Dedicated to all the authors of these Design Notes.
And to analog engineers everywhere in hopes that we will continue to develop more.
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For Sandra, Naomi, David and Sarah, the bright lights in my analog world.
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Contents
Publisher’s Note xxv
Acknowledgments xxxv
Introduction xxxvii
Foreword xxxix

PART 1 Power Management 1
Section 1 Power Management Design . . . . . . . . . . . . . . . . . . . 3
1 High performance single phase DC/DC controller with power system management . . . . 5
2 One device replaces battery charger, pushbutton controller, LED driver and
voltage regulator ICs in portable electronics . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Simple circuit replaces and improves on power modules at less than half the price . . . . 9
4 Wide input range, high efficiency DDR termination power supply achieves fast
transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5 Minimize input capacitors in multioutput, high current power supplies . . . . . . . . . . .13
6 Dual phase high efficiency mobile CPU power supply minimizes size and
thermal stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 SOT-23 SMBus fan speed controller extends battery life and reduces noise . . . . . . . .17
8 Active voltage positioning reduces output capacitors . . . . . . . . . . . . . . . . . . . .19
9 5 V to 3 .3 V circuit collection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
10 Hex level shift shrinks board space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Section 2 Microprocessor Power Design . . . . . . . . . . . . . . . . . 25
11 Cost effective, low profile, high efficiency 42 A supply powers AMD
Hammer processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
12 Efficient, compact 2-phase power supply delivers 40A to Intel mobile CPUs . . . . . . . . 29
13 Microprocessor core supply voltage set by I2C bus without VID lines . . . . . . . . . . . . 31
14 High efficiency I/O power generation for mobile Pentium III microprocessors . . . . . . .33
15 PolyPhase sur face mount power supply meets AMD Athlon processor
requirements with no heat sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
16 2-step voltage regulation improves performance and decreases CPU
temperature in portable computers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
17 Dual regulators power Pentium processor or upgrade CPU . . . . . . . . . . . . . . . . .39
18 Big power for big processors: a synchronous regulator . . . . . . . . . . . . . . . . . . .41
19 High efficiency power sources for Pentium processors . . . . . . . . . . . . . . . . . . .43
20 Fast regulator paces high performance processors . . . . . . . . . . . . . . . . . . . . .45
21 Techniques for deriving 3 .3 V from 5 V supplies . . . . . . . . . . . . . . . . . . . . . . . .47
22 Regulator circuit generates both 3 .3 V and 5 V outputs from 3 .3 V or 5 V to
run computers and RS232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49