10.3 A 94.2%-peak-efficiency 1.53A direct-battery-hook-up hybrid Dickson switched-capacitor DC-DC converter with wide continuous conversion ratio in 65nm CMOS

Liu, Wen-Chuen; Assem, Pourya; Lei, Yutian; Hanumolu, Pavan Kumar; Pilawa-Podgurski, Robert C. N.

doi:10.1109/isscc.2017.7870321

Cited by 51 publications

(9 citation statements)

References 4 publications

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“…A hybrid SIC converter that possesses the advantages of both a SC converter and a SI converter is an attractive solution [22][23][24][25][26][27][28][29][30]. However, it is complicated to design because of the many complex combinations of power switches and flying capacitors.…”

Section: Energy Transfer Mediamentioning

confidence: 99%

“…From Equation (25), IL can also be maintained at half of ILOAD, the same value as IL of the conventional multi-phase buck converter (CMBK) with two inductors [19]. Thus, the MBKETM can generate triple current paths (one L-path, two C-paths) with a single inductor and two low-cost,…”

Section: Multi-phase Buck Converter With Etmmentioning

confidence: 99%

“…Figure 20 shows the waveforms when f IN and f OUT are both equal to 1 MHz. I L is reduced to half of I LOAD because the output duty is fixed at 0.5, as shown in Equation (25). Moreover, ∆V O is as small as 25 mV because i D is continuous due to the presence of both the L-path and the C-path.…”

Section: Multi-phase Buck Converter With Etmmentioning

confidence: 99%

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An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

Shin

2019

Energies

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As miniaturized mobile devices with various functionalities are highly desired, the current requirement for loading blocks is gradually increasing. Accordingly, the efficiency of the power converter that supports the current to the loading bocks is a critical specification to prolong the battery time. Unfortunately, when using a small inductor for the miniaturization of mobile devices, the efficiency of the power converter is limited due to a large parasitic DC resistance (RDCR) of the inductor. To achieve high power efficiency, this paper proposes an energy transfer media (ETM) that can make a switched inductor capacitor (SIC) converter easier to design, maintaining the advantages of both a conventional switched capacitor (SC) converter and a switched inductive (SI) converter. This paper shows various examples of SIC converters as buck, boost, and buck-boost topologies by simply cascading the ETM with conventional non-isolated converter topologies without requiring a sophisticated controller. The topologies with the ETM offer a major advantage compared to the conventional topologies by reducing the inductor current, resulting in low conduction loss dissipated at RDCR. Additionally, the proposed topologies have a secondary benefit of a small output voltage ripple owing to the continuous current delivered to the load. Extensions to a multi-phase converter and single-inductor multiple-output converter are also discussed. Furthermore, a detailed theoretical analysis of the total conduction loss and the inductor current reduction is presented. Finally, the proposed topologies were simulated in PSIM, and the simulation results are discussed and compared with conventional non-isolated converter topologies.

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Section: Energy Transfer Mediamentioning

confidence: 99%

Section: Multi-phase Buck Converter With Etmmentioning

confidence: 99%

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An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

Shin

2019

Energies

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“…Hybrid architectures have recently emerged as an alternative to the SC-based approaches mentioned above. By cascading an SC stage with an inductive stage [6] or by merely placing an inductor between the power source and an SC converter [7], [8], these architectures seek to combine the advantages of inductive-and SC-based converters. Placing the inductor in the path of the charging/discharging current of the flying capacitor reduces hard-charging losses to a great extent.…”

Section: Introductionmentioning

confidence: 99%

A 91.15% Efficient 2.3–5-V Input 10–35-V Output Hybrid Boost Converter for LED-Driver Applications

Pal

Fish

McIntyre

et al. 2021

IEEE J. Solid-State Circuits

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This article presents a hybrid boost converter architecture for improving the efficiency of light-emitting diode (LED) drivers used in mobile applications. By cascading a lowswitching frequency time-interleaved series-parallel switchedcapacitor (SC)-stage with an inductive-boost converter, we facilitate lower voltage-rated switches, thus significantly reducing the switching losses. Charge-sharing losses of the SC stage are minimized by soft-charging flying capacitors with the inductor of the boost (BST) stage. Fabricated in 180-nm bipolar CMOS DMOS (BCD) process, the prototype converter generates 30-V output voltage from a Li-ion battery source. It can provide a load current in the range of 0-100 mA with an excellent peak power efficiency of 91.15% at 30 mA, which represents a 3% improvement over the state of the art.

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“…The main difference between switching regulators and linear ones, is that switching regulators store power in one phase, and discharge it in a second phase, so the current is 90 o out of phase with the voltage, while linear regulators uses voltage drop to regulate the voltage. So, energy within switching regulators can be stored and recovered during the discharge phase of the switching cycle, which make them higher in efficiency and more attractive for EHS for IoT smart nodes [73][74][75][76][77][78][79][80][81][82][83][84]. Thus, for maximum charge transfer efficiency, the clock duty cycle tends to be 50% with a small non-overlap period to avoid shoot-through current.…”

Section: Switching Regulatorsmentioning

confidence: 99%

Ultra-low power energy harvesting and power management circuits for IoT applications

Rawy¹

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Recent progress in integrated circuits (IC) technology and design techniques, especially in ultra-low power circuits domain, has led a rapid growth of fully integrated and portable electronics within internet of things (IoT) smart nodes and wearable sensors system on chip (SoC). IoT applications including biomedical sensors, body area networks and wireless sensors, have taken advantage of such a progress. However, with the increase of people needs, numerous blocks must be integrated within the IoT SoC. Hence, a compact, efficient and self-sustained power management circuit (PMC) with a long life-time design becomes crucial for IoT SoC. Thus, energy scavengers, such as photovoltaic cells (PV), thermos-electric generators (TEG) and electro-static harvesters, become an attractive solution to power the PMC, for self-sustaining and

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10.3 A 94.2%-peak-efficiency 1.53A direct-battery-hook-up hybrid Dickson switched-capacitor DC-DC converter with wide continuous conversion ratio in 65nm CMOS

Cited by 51 publications

References 4 publications

An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

A 91.15% Efficient 2.3–5-V Input 10–35-V Output Hybrid Boost Converter for LED-Driver Applications

Ultra-low power energy harvesting and power management circuits for IoT applications

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