A 100MHz Eight-Phase Buck Converter Delivering 12A in 25mm2 Using Air-Core Inductors

Schrom, G.; Hazucha, P.; Paillet, F.; Rennie, D.; Moon, Sung Tae; Gardner, Donald S.; Kamik, T.; Sun, Pengju; Nguyen, Trung-Thu; Hill, Michael J.; Radhakrishnan, Kaladhar; Memioglu, T.

doi:10.1109/apex.2007.357595

Cited by 57 publications

(39 citation statements)

References 3 publications

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“…These capabilities are increasingly reflected in the literature. Recently, several high frequency (> 100 MHz) low-voltage dc-dc converters have been demonstrated in deep sub-micron CMOS [49,94,93,114]. The switching frequencies of these converters are roughly one to two orders of magnitude higher than commercial products.…”

Section: Wl Whmentioning

confidence: 99%

Miniaturized Low-Voltage Power Converters With Fast Dynamic Response

Giuliano

D'Asaro

Zwart

et al. 2014

IEEE J. Emerg. Sel. Topics Power Electron.

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This thesis introduces a two-stage architecture that combines the strengths of switched capacitor (SC) techniques (small size, light-load performance) with the high efficiency and regulation capability of switch-mode power converters. The resulting designs have a superior efficient-power density trade-off over traditional designs. These power converters can provide numerous lowvoltage outputs over a wide input voltage range with a very fast dynamic response, which are ideal for powering logic devices in the mobile and high-performance computing markets.Both design and fabrication considerations for power converters using this architecture are addressed. The results are demonstrated in a 2.4 W dc-dc converter implemented in a 180 nm CMOS IC process and co-packaged with its passive components for high-performance. The converter operates from an input voltage of 2.7 V to 5.5 V with an output voltage of < 1.2 V, and achieves a 2210 W/inch 3 power density with ;> 80% efficiency.

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Section: Wl Whmentioning

confidence: 99%

Miniaturized Low-Voltage Power Converters With Fast Dynamic Response

Giuliano

D'Asaro

Zwart

et al. 2014

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Switched-capacitor converters have shown high efficiency at reasonable current densities but have done so only at fixed conversion ratio and without addressing transient requirements [2,3]. Meanwhile, switched-inductor (buck) converters have shown high current densities and efficiencies with a continuous range of conversion ratios, making buck converters the most promising of IVR candidates [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

An integrated four-phase buck converter delivering 1A/mm<sup>2</sup> with 700ps controller delay and network-on-chip load in 45-nm SOI

Sturcken

Petracca

Warren

et al. 2011

2011 IEEE Custom Integrated Circuits Conference (CICC)

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Abstract-We present a four-phase integrated buck converter in 45nm SOI technology. The controller uses unlatched pulse-width modulation (PWM) with nonlinear gain to provide both stable small-signal dynamics and fast response (~700ps) to large input and output transients. This fast control approach reduces the required output capacitance by 5X in comparison to a controller with latched PWM at similar operating point. The converter switches at 80MHz and delivers 1A/mm 2 at 83% efficiency and 0.66 conversion ratio.

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“…Since the required small volume and the low permeability of air limit the achievable inductance value, the switching frequency of the DC-DC converters has to be increased correspondingly, leading to low efficiencies without proper measures. The use of multiple air-core inductors in multi-phase Voltage-Regulator Module (VRM) applications has shown that efficiencies between 72% and 84% are possible for switching frequencies of 480 MHz and 100 MHz, respectively, for output powers above 10 W [5], [6]. However, for mobile applications the required output powers are much lower, complexity should be low and the height of SMD inductors inside the package is unacceptable.…”

Section: Introductionmentioning

confidence: 99%

An inductive down converter system-in-package for integrated power management in battery-powered applications

Bergveld

Karadi

Nowak

2008

2008 IEEE Power Electronics Specialists Conference

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Abstract-With the increasing number of voltage conversions that have to be efficiently implemented in a mobile device, the PCB space occupied by switched-mode DC-DC converters with external passive components will become unacceptably high. Therefore, a clear need exists for small-form-factor high-efficiency DC-DC converters having the necessary passive components integrated within one package. This will enable the integration of a DC-DC converter with the load and consequently the system integration of power management. This paper describes the measurement results of an integrated inductive down converter, where the active electronics (power stage and driver circuitry) has been implemented in 0.18-μ μ μ μm CMOS technology and the passive components (output LC filter and decoupling capacitor) have been implemented in a stateof-the-art proprietary passive-integration process technology using high-density trench-MOS capacitors (80 nF/mm 2 ) and an 8-μ μ μ μm thick copper top metallization layer. The active die of the converter has been flip-chipped on top of the passive die to reduce parasitic component values. This yields a System-in-Package (SiP) that achieves a step-down DC-DC conversion without any external components. Due to the limited inductance achievable with the used planar air coil in the acceptable area, the switching frequency of the DC-DC converter has been increased. At the same time, Zero-Voltage-Switching (ZVS) measures have been implemented to reduce the switching losses at this increased frequency. A maximum efficiency of 65% at 80 MHz has been achieved for an input voltage of 1.8 V, an output voltage of 1.1 V and an output current of 100 mA. After explaining the motivation behind integrated power management and the choice for an integrated inductive converter, this paper describes the main design aspects of the realized integrated inductive DC-DC down converter. Next, it presents some details of the used passive-integration process, the design of the passive die including the LC filter and the construction of the SiP. Finally, the measurement results of the converter are discussed and conclusions are drawn.

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A 100MHz Eight-Phase Buck Converter Delivering 12A in 25mm2 Using Air-Core Inductors

Cited by 57 publications

References 3 publications

Miniaturized Low-Voltage Power Converters With Fast Dynamic Response

Miniaturized Low-Voltage Power Converters With Fast Dynamic Response

An integrated four-phase buck converter delivering 1A/mm<sup>2</sup> with 700ps controller delay and network-on-chip load in 45-nm SOI

An inductive down converter system-in-package for integrated power management in battery-powered applications

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