An Inductor-First Single-Inductor Multiple-Output Hybrid DC-DC Converter With Integrated Flying Capacitor for SoC Applications

With the increasing complexity of highly integrated system on chips (SoCs), the power management system (PMS) is required to provide several power supplies efficiently for individual blocks. This paper presents a single-inductor multiple-output (SIMO) inductor-first hybrid converter that generates t...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2022-12, Vol.69 (12), p.4823-4836
Main Authors: Zhou, Zhiyuan, Tang, Nghia, Nguyen, Bai, Hong, Wookpyo, Pande, Partha Pratim, Krishnamurthy, Ram K., Heo, Deukhyoun
Format: Article
Language:English
Subjects:
Capacitors
cross-regulation
dc-dc converter
Electric potential
Electric power supplies
fast transient response
hybrid buck converter
Hybrid power systems
Inductors
Power management
Regulators
Response time
single-inductor multiple-output
Switches
System-on-chip
Topology
Transient response
Voltage
Voltage control
Voltage converters (DC to DC)
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Summary:With the increasing complexity of highly integrated system on chips (SoCs), the power management system (PMS) is required to provide several power supplies efficiently for individual blocks. This paper presents a single-inductor multiple-output (SIMO) inductor-first hybrid converter that generates three outputs between 0.4V and 1.6V from a 1.8V input. The proposed multiple-output hybrid power stage can improve the conversion efficiency by reducing inductor current while extending the output voltage range compared with the existing hybrid topologies. In addition, the proposed converter employs an on-chip switched-capacitor power stage (SCPS) with a dual-switching frequency technique, resulting in a fast response time, low cross-regulation, and reduced number of on-chip pads. Measurement results show that the converter achieves a peak efficiency of 87.5% with the maximum output current of 450mA. The converter is integrated with a fast voltage regulation loop with 500MHz system clock to achieve a less than 0.01mA/mV cross-regulation and a maximum 20mV overshoot at full-load transient response. The design is fabricated in the standard 180nm CMOS technology.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2022.3198389