A 2.5–5-V Input 100-V Output 86.2% Peak Efficiency Fibonacci-Dickson Hybrid Converter for Acoustic Surface Audio Driver

This article introduces a hybrid boost converter designed for the acoustic surface audio driver, operating within an input voltage range of 2.5–5 V and boosting it to a high voltage (HV) of 100 V. The proposed design adopts a cascaded approach by integrating the Fibonacci and Dickson switched-capacitor (SC) topologies. This combination enables the converter to achieve a high-voltage conversion ratio (VCR). It offers the advantages of a reduced number of flying capacitors and reduced voltage stress for power switches. To improve the overall efficiency, we only use laterally diffused N-type metal-oxide-semiconductor (LDNMOS) power switches, which offer lowon-resistance, fast switching, and reduced fabrication mask requirements. In addition, a stacked active bootstrap replaces the conventional bootstrap diode with an actively controlled transistor that has loweron-resistance, overcoming the diode forward voltage drop issue and improving efficiency. The converter delivers a maximum output power of 2 W at 100-V output voltage with a peak efficiency of 86.2% and a power density of 7.43 W/cm3.