A highly efficient interleaved DC-DC converter using coupled inductors in gaas technology

摘要

This paper presents a high power efficiency DC-DC buck converter in Gallium Arsenide technology targeting integrated power amplifier modules. The buck converter adopts an interleaved structure with negatively coupled inductors. Analysis of the effect of coupling on the steady state and transient response of the converter is given. The coupling factor is selected to achieve a maximum power efficiency for a given duty cycle with a minimum penalty on current ripple performance. The DC-DC converter is implemented in 0.5 mum GaAs pHEMT process and occupies 2.7times2.7 mm² without the output network. It converts 4.5 V input to 3.3 V output for 1 A load current under 250 MHz switching frequency with a power efficiency of 86.1%.