Abstract
A high frequency voltage-controlled PWM/PSM dual-mode Buck DC-DC converter is presented in this paper. In order to achieve high efficiency over its entire load range, pulse-width modulation (PWM) and pulse-skip modulation (PSM) were integrated in the proposed Buck converter. By adopting a novel load current sensing circuit, the converter’s operation mode can be automatically changed between PWM and PSM mode according to load current. Different from the traditional inductor current sensing circuit, the proposed load current sensing circuit is realized by detecting the gate driver signal of synchronous power NMOS which changes with the load current simultaneously. The proposed Buck converter has been designed and simulated in SMIC 0.18 μm CMOS process. Simulation results show that the peak conversion efficiency of the Buck converter is about 85 %. It is able to regulate the output voltage at 1.2 V from a 1.6 ~ 3 V supply voltage for the maximum output current of 500 mA with 20 MHz switching frequency.
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