Design and Implementation of Fully-Integrated Inductive DC-DC Converters

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Book: Design And Implementation Of Fully-Integrated Inductive DC-DC Converters In Standard CMOS


Author: Mike Wens, Michiel Steyaert
Binding: Hardcover
Publishing Date: 06/2011
Publisher: Springer
Edition: Edition. Edition
Number of Pages: 338
Language: English


Technological progress in the semiconductor industry has led to a revolution towards new advanced, miniaturized, intelligent, battery-operated and wireless electronic applications. The required supply voltage(s) of these applications seldom matches the varying battery voltage, due to technological reasons. Therefore, efficient voltage converters are crucial to bridge this voltage gap, without compromising the battery’s autonomy as do linear voltage converters. In addition, both space and cost constraints form a strong incentive towards fully-integrated CMOS switched-mode DC-DC converters, effectively eliminating the need for large and expensive off-chip passives (inductors and capacitors).
To achieve this goal Fully-Integrated Inductive DC-DC Converters in Standard CMOS provides the following assets:

• A firm but comprehensive theoretical base on switched-mode DC-DC converters, giving the designer the crucial information for understanding the operating principles and fundamental limitations of different types of DC-DC converters, including linear converters, charge-pump converters and inductive converters.
• An overview and comparison of different types of inductive DC-DC converters and their mutual comparison towards monolithic integration provides a versatile knowledge base to match witch the constraints of the converter to be designed.
• An accurate and fast model for fully-integrated inductive DC-DC converters is discussed, taking into account all the significant losses in CMOS technologies. This model allows very accurate prediction of the steady-state parameters, including the efficiency. Furthermore, it allows a fast convergence towards the optimal design values, despite the multi-dimensional design-space.
• High-speed control schemes for controlling the output voltage are explained intuitively and from a practical point of view. In addition three new control concepts: COOT, SCOOT and F²SCOOT are revealed. Many concrete schematics are provided and explained, which are also used in the various chip realizations. As such, this hands-on approach provides the “feeling” for control system design for fully-integrated DC-DC converters to the designer.
• The book is concluded with seven practical proof-of-concept chip realizations of fully-integrated DC-DC converters, thereby using both bondwire and metal-track inductors. Many practical issues, such as chip lay-out and measurement setups, are discussed, providing the designer even more to-the-point practical information on the subject.

Fully-Integrated Inductive DC-DC Converters in Standard CMOS is an essential work for research and design engineers that are confronted with fully- and/or highly-integrated DC-DC converters. The approach in this book ranges from a firm theoretical base to understand the trade-offs, towards a highly practical and realistic mindset.

Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 TheOriginofDC-DCConverters . . . . . . . . . . . . . . . . . . 2
1.1.1 BasicConsiderations . . . . . . . . . . . . . . . . . . . . 2
1.1.2 HistoricalNotes . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 LowPowerDC-DCConverterApplications . . . . . . . . . . . . 9
1.2.1 Mains-Operated . . . . . . . . . . . . . . . . . . . . . . . 10
1.2.2 Battery-Operated . . . . . . . . . . . . . . . . . . . . . . . 11
1.3 Monolithic DC-DC Converters: A Glimpse into the Future . . . . . 14
1.3.1 CMOS Technology . . . . . . . . . . . . . . . . . . . . . 15
1.3.2 The Challenges . . . . . . . . . . . . . . . . . . . . . . . 20
1.4 Structural Outline . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2 Basic DC-DC Converter Theory . . . . . . . . . . . . . . . . . . . . . 27
2.1 Linear Voltage Converters . . . . . . . . . . . . . . . . . . . . . . 27
2.1.1 SeriesConverter . . . . . . . . . . . . . . . . . . . . . . . 28
2.1.2 Shunt Converter . . . . . . . . . . . . . . . . . . . . . . . 29
2.2 Charge-PumpDC-DCConverters . . . . . . . . . . . . . . . . . . 31
2.2.1 On Capacitors . . . . . . . . . . . . . . . . . . . . . . . . 32
2.2.2 Series-ParallelStep-DownConverter . . . . . . . . . . . . 34
2.2.3 Series-ParallelStep-UpConverter . . . . . . . . . . . . . . 38
2.3 Inductive Type DC-DC Converters . . . . . . . . . . . . . . . . . 41
2.3.1 On Inductors . . . . . . . . . . . . . . . . . . . . . . . . . 41
2.3.2 Inductors and Capacitors: The Combination . . . . . . . . 44
2.3.3 Reflections on Steady-State Calculation Methods . . . . . . 49
2.4 INTERMEZZO: The Efficiency Enhancement Factor . . . . . . . 59
2.4.1 The Concept . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.4.2 Interpretations . . . . . . . . . . . . . . . . . . . . . . . . 61
2.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3 Inductive DC-DC Converter Topologies . . . . . . . . . . . . . . . . 65
3.1 Step-DownConverters . . . . . . . . . . . . . . . . . . . . . . . . 65
ix
x Contents
3.1.1 BuckConverter . . . . . . . . . . . . . . . . . . . . . . . 66
3.1.2 BridgeConverter . . . . . . . . . . . . . . . . . . . . . . . 72
3.1.3 Three-LevelBuckConverter . . . . . . . . . . . . . . . . 74
3.1.4 Buck2 Converter . . . . . . . . . . . . . . . . . . . . . . . 77
3.1.5 Watkins-Johnson Converter . . . . . . . . . . . . . . . . . 79
3.1.6 Step-DownConverterSummary . . . . . . . . . . . . . . . 81
3.2 Step-UpConverters . . . . . . . . . . . . . . . . . . . . . . . . . 82
3.2.1 BoostConverter . . . . . . . . . . . . . . . . . . . . . . . 84
3.2.2 Current-FedBridgeConverter . . . . . . . . . . . . . . . . 85
3.2.3 Inverse Watkins-Johnson Converter . . . . . . . . . . . . . 86
3.2.4 Step-UpConverterSummary . . . . . . . . . . . . . . . . 88
3.3 Step-Up/DownConverters . . . . . . . . . . . . . . . . . . . . . . 90
3.3.1 Buck-Boost Converter . . . . . . . . . . . . . . . . . . . . 91
3.3.2 Non-inverting Buck-Boost Converter . . . . . . . . . . . . 92
3.3.3 ´CukConverter . . . . . . . . . . . . . . . . . . . . . . . . 93
3.3.4 SEPICConverter . . . . . . . . . . . . . . . . . . . . . . . 94
3.3.5 ZetaConverter . . . . . . . . . . . . . . . . . . . . . . . . 95
3.3.6 Step-Up/DownConverterSummary . . . . . . . . . . . . . 97
3.4 Other Types of Inductive DC-DC Converters . . . . . . . . . . . . 99
3.4.1 Galvanic Separated Converters . . . . . . . . . . . . . . . 99
3.4.2 Resonant DC-DC Converters . . . . . . . . . . . . . . . . 104
3.5 Topology Variations . . . . . . . . . . . . . . . . . . . . . . . . . 107
3.5.1 Multi-phase DC-DC Converters . . . . . . . . . . . . . . . 107
3.5.2 Single-Inductor Multiple-Output DC-DC Converters . . . . 115
3.5.3 On-Chip Topologies . . . . . . . . . . . . . . . . . . . . . 118
3.6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
4 A Mathematical Model: Boost and Buck Converter . . . . . . . . . . 123
4.1 Second-Order Model: Boost and Buck Converter . . . . . . . . . . 124
4.1.1 DifferentialEquations:BoostConverter . . . . . . . . . . . 124
4.1.2 Calculating the Output Voltage: Boost Converter . . . . . . 126
4.1.3 DifferentialEquations:BuckConverter . . . . . . . . . . . 131
4.1.4 Calculating the Output Voltage: Buck Converter . . . . . . 132
4.2 Non-ideal Converter Components Models . . . . . . . . . . . . . . 135
4.2.1 Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
4.2.2 Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
4.2.3 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
4.2.4 Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
4.2.5 Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . 154
4.3 TemperatureEffects . . . . . . . . . . . . . . . . . . . . . . . . . 158
4.3.1 Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
4.3.2 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
4.4 The Final Model Flow . . . . . . . . . . . . . . . . . . . . . . . . 160
4.4.1 Inserting the Dynamic Losses . . . . . . . . . . . . . . . . 161
4.4.2 InsertingtheTemperatureEffects . . . . . . . . . . . . . . 163
4.4.3 Reflections on Design . . . . . . . . . . . . . . . . . . . . 164
4.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Contents xi
5 Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
5.1 Inductive Type Converter Control Strategies . . . . . . . . . . . . 170
5.1.1 Pulse Width Modulation . . . . . . . . . . . . . . . . . . . 170
5.1.2 Pulse Frequency Modulation . . . . . . . . . . . . . . . . 175
5.1.3 Pulse Width Modulation vs. Pulse Frequency Modulation . 176
5.2 ConstantOn/Off-Time:COOT . . . . . . . . . . . . . . . . . . . 181
5.2.1 The COOT Concept . . . . . . . . . . . . . . . . . . . . . 181
5.2.2 Single-Phase, Single-Output Implementations . . . . . . . 184
5.2.3 Single-Phase, Two-Output SIMO Implementation . . . . . 188
5.3 Semi-ConstantOn/Off-Time:SCOOT. . . . . . . . . . . . . . . . 193
5.3.1 The SCOOT Concept . . . . . . . . . . . . . . . . . . . . 193
5.3.2 Multi-phase Implementations . . . . . . . . . . . . . . . . 195
5.4 Feed-Forward Semi-Constant On/Off-Time: F2-SCOOT . . . . . . 203
5.4.1 The F2-SCOOT Concept . . . . . . . . . . . . . . . . . . . 203
5.4.2 Single-Phase, Two-Output Implementation . . . . . . . . . 205
5.5 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
5.5.1 The Concept . . . . . . . . . . . . . . . . . . . . . . . . . 210
5.5.2 Implementations . . . . . . . . . . . . . . . . . . . . . . . 210
5.6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
6 Implementations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
6.1 Monolithic Converter Components . . . . . . . . . . . . . . . . . 214
6.1.1 Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
6.1.2 Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
6.1.3 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
6.2 OnMeasuringDC-DCConverters . . . . . . . . . . . . . . . . . . 224
6.2.1 MainPrinciples . . . . . . . . . . . . . . . . . . . . . . . 224
6.2.2 PracticalExample . . . . . . . . . . . . . . . . . . . . . . 226
6.3 BoostConverters . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
6.3.1 Bondwire, Single-Phase, Single-Output . . . . . . . . . . . 228
6.3.2 Metal-Track, Single-Phase, Two-Output SIMO . . . . . . . 232
6.4 BuckConverters . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
6.4.1 Bondwire, Single-Phase, Single-Output . . . . . . . . . . . 236
6.4.2 Metal-Track, Single-Phase, Single-Output . . . . . . . . . 240
6.4.3 Metal-Track, Four-Phase, Single Output . . . . . . . . . . 244
6.4.4 Metal-Track, Four-Phase, Two-Output SMOC . . . . . . . 248
6.4.5 Bondwire, Single-Phase, Two-Output SMOC . . . . . . . . 250
6.5 ComparisontoOtherWork . . . . . . . . . . . . . . . . . . . . . 254
6.5.1 Inductive Step-Up Converters . . . . . . . . . . . . . . . . 255
6.5.2 Inductive Step-Down Converters . . . . . . . . . . . . . . 256
6.6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
7 General Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
7.1 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
7.2 Remaining Challenges . . . . . . . . . . . . . . . . . . . . . . . . 263
xii Contents
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273


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hezudao

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Good book; thanks

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