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

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