2017
DOI: 10.3390/sym9010018
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Fully Integrated on-Chip Switched DC–DC Converter for Battery-Powered Mixed-Signal SoCs

Abstract: This paper presents a fully integrated on-chip switched-capacitor (SC) DC-DC converter that supports a programmable regulated power supply ranging from 2.6 to 3.2 V out of a 5 V input supply. The proposed 4-to-3 step-down topology utilizes two conventional 2-to-1 step-down topologies; each of them (2-to-1_up and 2-to-1_dw) has a different flying capacitance to maximize the load current driving capability while minimizing the bottom-plate capacitance loss. The control circuits use a low power supply provided by… Show more

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Cited by 6 publications
(8 citation statements)
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“…Due to the limitation of existing feedback-based PFM, only limited f max /f min of 132 is used in [6], while the proposed converter allows for an extremely large f max /f min up to 1000. The capacitor banks used in this implementation offer five buck voltage conversion ratios, higher than the works in [5,6,[9][10][11]16]. To further reduce the output ripple while having the wide load range, our architecture allows the number of phases to be increased to match [5,6].…”
Section: Discussionmentioning
confidence: 99%
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“…Due to the limitation of existing feedback-based PFM, only limited f max /f min of 132 is used in [6], while the proposed converter allows for an extremely large f max /f min up to 1000. The capacitor banks used in this implementation offer five buck voltage conversion ratios, higher than the works in [5,6,[9][10][11]16]. To further reduce the output ripple while having the wide load range, our architecture allows the number of phases to be increased to match [5,6].…”
Section: Discussionmentioning
confidence: 99%
“…Therefore, to fully benefit from a converter using multiphase, all capacitor banks must be operational at all times. A popular technique to reduce switching losses is utilizing Pulse Frequency Modulation (PFM), which reduces the switching of the converter depending on the load [6,10,11]. Most of existing PFM methods are reactive (act in response to an event), which change the switching frequency based on the output voltage feedback.…”
Section: Introductionmentioning
confidence: 99%
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“…The switch conductance loss is caused by the resistance in the on state of the switch. Increasing the size of the switch reduces the conductance loss but increases the shunt loss via the parasitic capacitance of the switch [23]. The intrinsic SC loss is caused by voltage ripple ∆V F due to the charge and discharge of the capacitor, as shown in Figure 5d.…”
Section: Operation Of the 2:1 Step-down Sc Dc-dc Convertermentioning
confidence: 99%
“…Depending on the number of mixed signal modules that are required for this portable device, the number of linear regulators needed to supply them power increases as well. Although the more cost and area effective, as the voltage drop between the main power supply and the local power required at each module increases, the collective power loss from the regulators becomes more significant [6]. Therefore, not only does power loss become a concern, but the added circuitry needed to supply the different power rails also takes up area and time for designing and debugging in order to ensure all components work together.…”
Section: Power Managementmentioning
confidence: 99%