A 2-PHASE HYBRID BOOST CONVERTER WITH SHARED BOOTSTRAP CAPACITOR ACHIEVING 90% EFFICIENCY AT 5.0 CONVERSION RATE
Keywords:
DC-DC converter, 2-phase hybrid boost, soft charging, capacitor cross-connected, shared capacitor bootstrap.
Abstract
Many devices now require a higher voltage supply than its predecessors. This has enabled the development of hybrid boost topology, which proved to have
a higher conversion rate, though not without its own problems, especially the hard-charging of capacitors. This work introduces a voltage converter that
eliminates hard-charging losses by ensuring that the flying capacitors charge and discharge through inductors. The design is simulated in the Cadence 180nm
CMOS process. The step-up power conversion from the input voltage of 2 - 4.2V to 15 - 20V output voltage, providing 1.3 - 5W output power at 2MHz operating
frequency. The simulation result shows a peak efficiency of 90% at 3.3V input voltage and 16.5V output voltage.
