4.3 An 87%-peak-efficiency DVS-capable single-inductor 4-output DC-DC buck converter with ripple-based adaptive off-time control

Lu, Danzhu; Qian, Yong; Hong, Zhiliang

doi:10.1109/isscc.2014.6757347

Cited by 58 publications

(35 citation statements)

References 3 publications

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“…These controllers are ripple-based controllers, i.e., they regulate either the peak or valley of the output voltage rather than its average. Therefore, as the load level changes, the average output voltage will change with it as seen in [7] and [9]. Moreover, the IR drop between the measurement point on the PCB where the load step is being applied and the internal feedback node that the controller is regulating contributes to that offset as well.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…Moreover, since the input loop regulates , its quiescent component is . Combining (2)-(4), the following simultaneous equations for the quiescent components of , , and can be derived for a given and : These simultaneous equations can be solved numerically; and using linearization techniques on (2)-(5), the small-signal loop transfer function can then be written as: (8) where (9) Equations (8) and (9) show that the loop transfer function does not contain any poles or zeros despite the fact that the inductor is operating in CCM. This can be understood by considering that using current-mode control for the input stage reduces the order of the system to first order rather than second order, which is generally true for current-mode controllers [19].…”

Section: Control Loop and Small-signal Analysismentioning

confidence: 99%

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A Low-Power Dual-Frequency SIMO Buck Converter Topology With Fully-Integrated Outputs and Fast Dynamic Operation in 45 nm CMOS

Chen

Fayed

2015

IEEE J. Solid-State Circuits

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The dual-frequency single-inductor multiple-output (DF-SIMO) buck converter topology is proposed. Unlike conventional single-frequency SIMO topologies, the DF-SIMO decouples the rate of power conversion at the input stage from the rate of power distribution at the output stage. Switching the input stage at low frequency ( 2 MHz) simplifies its design in nanometer CMOS, especially with input voltages higher than 1.2 V, while switching the output stage at higher frequency enables faster output dynamic response, better cross-regulation, and smaller output capacitors without the efficiency and design complexity penalty of switching both the input and output stages at high frequency. Moreover, for output switching frequency higher than 100 MHz, the output capacitors can be small enough to be integrated on-chip. A low-power 5-output 2 MHz/120 MHz design in 45 nm with 1.8 V input targeting low-power microcontrollers is presented as an application. The outputs vary from 0.6 V to 1.6 V, with 4 outputs providing up to 15 mA and one output providing up to 50 mA. The design uses single 10 µH off-chip inductor, 2 nF on-chip capacitor for each 15 mA output and 4.5 nF for the 50 mA output. The peak efficiency is 73%, dynamic voltage scaling (DVS) is 0.6 V/80 ns, and settling time is 30 ns for half-to-full load steps with no observable overshoot/undershoot or cross-regulation transients.Index Terms-Dynamic voltage scaling, inductor-based power converters, integrated DC-DC power converters, power management, SIMO power converters.

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Section: Measurement Resultsmentioning

confidence: 99%

Section: Control Loop and Small-signal Analysismentioning

confidence: 99%

A Low-Power Dual-Frequency SIMO Buck Converter Topology With Fully-Integrated Outputs and Fast Dynamic Operation in 45 nm CMOS

Chen

Fayed

2015

IEEE J. Solid-State Circuits

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“…The inductive switching converter has high power efficiency and large current driving capability, but requires external inductor and capacitor. However, it is not practical to use multiple external inductors in generating multiple supply voltages which are required for mobile devices [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In [4][5][6][7][8][9][10][11][12], the single-inductor multiple-outputs (SIMO) DC-DC converter was introduced to generate the required supply voltages without increasing the number of external inductors. This SIMO DC-DC converter uses only one inductor to generate multiple outputs.…”

Section: Introductionmentioning

confidence: 99%

A Highly Power-Efficient Single-Inductor Multiple-Outputs (SIMO) DC-DC Converter with Gate Charge Sharing Method

Nam

Seo

Ahn

et al. 2014

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper proposes a highly powerefficient single-inductor multiple-outputs (SIMO) DC-DC converter with a gate charge sharing method in which gate charges of output switches are shared to improve the power efficiency and to reduce the switching power loss. The proposed converter was fabricated by using a 0.18 µm CMOS process technology with high voltage devices of 5 V. The input voltage range of the converter is from 2.8 V to 4.2 V, which is based on a single cell lithium-ion battery, and the output voltages are 1.0 V, 1.2 V, 1.8 V, 2.5 V, and 3.3 V. Using the proposed gate charge sharing method, the maximum power efficiency is measured to be 87.2% at the total output current of 450 mA. The measured power efficiency improved by 2.1% compared with that of the SIMO DC-DC converter without the proposed gate charge sharing method.Index Terms-DC-DC converter, single inductor multiple outputs (SIMO), power efficiency, charge sharing, switching power loss

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“…Single-Inductor Multiple-Output (SIMO) converters are excellent candidates to meet this requirement [1][2][3]. However, there are several issues with SIMO converters, such as cross regulation, instability and inefficiency at light load.…”

mentioning

confidence: 99%

12.5 An error-based controlled single-inductor 10-output DC-DC buck converter with high efficiency at light load using adaptive pulse modulation

Jung

Park

Bang

et al. 2015

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers

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Reducing the number of large external components, especially inductors, is a very important issue for Power-Management ICs (PMICs). Single-Inductor Multiple-Output (SIMO) converters are excellent candidates to meet this requirement [1][2][3]. However, there are several issues with SIMO converters, such as cross regulation, instability and inefficiency at light load. Under normal load conditions, comparator-based controlled SIMO converters [1,2] show good cross regulation performance due to the fast response of the comparator. However, the switching loss remains constant and degrades light load efficiency due to the fixed switching frequency of output switches. The low-efficiency characteristic when any output is under light load condition is a critical issue that must be solved because a SIMO converter is very suitable for light load applications. In addition, the cross regulation issue appears again when any output is under no load because the output receives energy from the inductor every cycle despite the load condition. To solve these issues, a SIMO converter was previously reported to support Pulse Frequency Modulation (PFM) mode [3]. However, the mode change control method increases the complexity of the control loop, which makes it unsuitable for a multi-output SIMO converter. In this paper, an Error Based Controlled (EBC) SIMO converter is presented to resolve the problems raised above using load-dependent Adaptive Pulse Modulation (APM). A hybrid topology composed of a switching converter and a linear regulator is also presented to minimize the cross regulation issue. To highlight the advantages, a 10-output SIMO converter is designed.

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4.3 An 87%-peak-efficiency DVS-capable single-inductor 4-output DC-DC buck converter with ripple-based adaptive off-time control

Cited by 58 publications

References 3 publications

A Low-Power Dual-Frequency SIMO Buck Converter Topology With Fully-Integrated Outputs and Fast Dynamic Operation in 45 nm CMOS

A Low-Power Dual-Frequency SIMO Buck Converter Topology With Fully-Integrated Outputs and Fast Dynamic Operation in 45 nm CMOS

A Highly Power-Efficient Single-Inductor Multiple-Outputs (SIMO) DC-DC Converter with Gate Charge Sharing Method

12.5 An error-based controlled single-inductor 10-output DC-DC buck converter with high efficiency at light load using adaptive pulse modulation

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