An 82.9%-Efficiency Triple-Output Battery Management Unit for Implantable Neuron Stimulator in 180-nm Standard CMOS

Chi Wei Liu, Yi Lun Chen, Pei Chun Liao, Shiau Pin Lin, Ting Wei Wang, Ming Jie Chung, Po-Hung Chen*, Ming-Dou Ker, Chung-Yu Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This brief presents a high-efficiency battery management unit combining a single-inductor dual-output (SIDO) buck converter with two charge pumps (CPs) to provide three voltage levels (6 V,-6 V, and 2 V) for neuron stimulators in implantable medical devices. The stacked power stage in the buck converter mitigates the voltage stress issue in the power stage to manage 3.2-4.8 V battery voltage. By cascading a buck converter and CPs, the voltage across the CP power stage is reduced to generate 6 V and-6 V high voltage outputs without using high voltage devices. As a result, the proposed battery management could provide 6 V,-6 V, and 2 V output voltages from 3.2 to 4.8 V input voltage using a 180-nm standard CMOS process. The measurement results demonstrate that the proposed battery management achieved a peak efficiency of 82.9% with an available input voltage of 3.2-4.8 V.

Original languageEnglish
Article number8684223
Pages (from-to)788-792
Number of pages5
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume66
Issue number5
DOIs
StatePublished - 1 May 2019

Keywords

  • BMU
  • High voltage generator
  • buck converter
  • charge pump
  • overstress
  • soft start-up
  • transistors stacking

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