Dissertation Talk: Power Management for Li-ion Battery to Processor Core Supply: A direct Power Delivery Scheme Enabled with a Hybrid DC-DC Converter Approach

Apr26

Dissertation Talk: Power Management for Li-ion Battery to Processor Core Supply: A direct Power Delivery Scheme Enabled with a Hybrid DC-DC Converter Approach

531 Cory Hall
  • Yongjun Li
Due to limited platform size, most portable and wearable electronics call for a compact power management achitecture with high efficiency and high power density. The conventional buck converter requires bulky magnetics that consume a large amount of board areas. The switched capacitor (SC) converter, though promising for a fully integrated solution, is not efficient for continuous voltage regulation to cover a wide operation range. In this talk, we introduce a family of hybrid DC-DC converter topologies to mitigate the limitations in either purely inductive or capacitive power conversion approach. The proposed hybrid topology enables efficacious use of standard CMOS technology as in a SC converter and at the same eliminate the fundamental charge sharing loss by leveraging much smaller inductance compared to buck converter. A intuitive model is developed to capture the operation principle and facilitate the control design. A silicon prototype was implemented in 0.15um CMOS process for achieving conversion > 3:1 with utilizing package interconnection loop as the effective inductor. The prototype achieves 87.2% peak efficiency with 83.4% at a power density of 0.46W/mm2 and 50mV undershoot/overshoot under a 0.4A on-die load step.
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