A 91.15% Efficient 2.3-5-V Input 10-35-V Output Hybrid Boost Converter for LED-Driver Applications

Nilanjan Pal, Adam Fish, William McIntyre, Nathanael Griesert, Greg Winter, Travis Eichhorn, Robert Pilawa-Podgurski, Pavan Kumar Hanumolu

Research output: Contribution to journalArticlepeer-review


This article presents a hybrid boost converter architecture for improving the efficiency of light-emitting diode (LED) drivers used in mobile applications. By cascading a low-switching frequency time-interleaved series-parallel switched-capacitor (SC)-stage with an inductive-boost converter, we facilitate lower voltage-rated switches, thus significantly reducing the switching losses. Charge-sharing losses of the SC stage are minimized by soft-charging flying capacitors with the inductor of the boost (BST) stage. Fabricated in 180-nm bipolar CMOS DMOS (BCD) process, the prototype converter generates 30-V output voltage from a Li-ion battery source. It can provide a load current in the range of 0-100 mA with an excellent peak power efficiency of 91.15% at 30 mA, which represents a 3% improvement over the state of the art.

Original languageEnglish (US)
Pages (from-to)3499-3510
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Issue number11
StateAccepted/In press - 2021


  • DC-DC converter
  • hybrid converter
  • Inductors
  • Light emitting diodes
  • light-emitting diode (LED) drivers.
  • Logic gates
  • Mathematical model
  • Switches
  • Switching frequency
  • Switching loss

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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