Highly Efficient Power Management in Wearables and IoT Devices

  • Juergen WittmannEmail author
  • Francesco Cannillo
  • Dan Ciomaga
  • Mihail Jefremow
  • Fabio Rigoni


Wearables and IoT devices cover a large design space for power management. Sensor applications require a very efficient standby mode to allow an operation over several years with one battery, while battery charging or data processing utilizes voltage converters providing tens of Watts with negligible power losses. This work presents design techniques to address a large range of the IoT power management design space. Architecture and circuit design techniques in power management ICs, including an analog core supply concept, linear regulators, and reference generators, are proposed, which allow an IoT device to consume a standby current in the sub-microampere region. A switched-capacitor converter and a 3-level buck converter are presented, which are especially suitable for input voltages up to 10 V and output currents as high as 10 A, achieving up to 98% peak efficiency.


IoT Power management Efficiency Multi-level buck converter Switched-capacitor converter 


  1. 1.
    H. Bauer, M. Patel, J. Veira, The internet of things: sizing up the opportunity (2014)Google Scholar
  2. 2.
    D. Serpanos, M. Wolf, Internet-of-Things (IoT) Systems (Springer, Cham, 2018)CrossRefGoogle Scholar
  3. 3.
    M.D. Saulles, The Internet of Things and Business (Routledge, Columbia, 2016)Google Scholar
  4. 4.
    Dialog datasheet, DA9313, high efficiency dual cell switched capacitor divider, in Dialog Semiconductor (2018). Available
  5. 5.
    M. Al-Shyoukh, A. Kalnitsky, A 500nA quiescent current, trim-free, ±1.75% absolute accuracy, CMOS-only voltage reference based on anti-doped N-channel MOSFETs, in Proceedings of the IEEE 2014 Custom Integrated Circuits Conference, San Jose, CA (2014), pp. 1–4Google Scholar
  6. 6.
    M. Seeman, A design methodology for switched-capacitor DC-DC converters, University of California, Berkeley, Technical Report No. UCB/EECS-2009-78, 2009Google Scholar
  7. 7.
    L. Chang et al., A fully-integrated switched-capacitor 2:1 voltage converter with regulation capability and 90% efficiency at 2.3A/mm2, in IEEE Symposium on VLSI Circuits (2010)Google Scholar
  8. 8.
    T.A. Meynard, H. Foch, Multi-level conversion: high voltage choppers and voltage-source inverters, in IEEE Power Electronics Specialists Conference (1992), pp. 397–403Google Scholar
  9. 9.
    V. Yousefzadeh et al., Three-level buck converter for envelope tracking applications. IEEE Trans. Power Electron. 21(2), 549–552 (2006)CrossRefGoogle Scholar
  10. 10.
    W. Kim et al., A fully integrated 3-level DC-DC converter for nanosecond-scale DVFS. IEEE J. Solid-State Circuits 47(1), 206–219 (2012)CrossRefGoogle Scholar
  11. 11.
    Dialog datasheet, DA9230, ultra-low quiescent current buck, in Dialog Semiconductor (2018). Available

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Juergen Wittmann
    • 1
    Email author
  • Francesco Cannillo
    • 1
  • Dan Ciomaga
    • 1
  • Mihail Jefremow
    • 1
  • Fabio Rigoni
    • 1
  1. 1.Dialog SemiconductorGermeringGermany

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