모바일 SoC 응용을 위한 다중 분할 스위칭 기반의 고효율 저잡음 PWM DC-DC buck 변환기
A High-Efficiency Low-Noise PWM DC-DC Buck Converter Based on Multi-Partition Switching for Mobile SoC Applications
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초록
본 논문에서는 모바일 SoC 응용을 위해 다상 스위칭 기법을 적용한 고효율 저잡음 PWM DC-DC buck 변환기를 제안한다. 제안하는 DC-DC buck 변환기에 적용된 다상 스위칭 기법은 출력단 트랜지스터의 고속 스위칭 동작에 의해 발생하는 기판 잡음 및 출력전압의 오버슈트 및 언더슈트와 같은 글리치 잡음을 최소화하기 위하여, 출력단 트랜지스터를 몇 개의 쌍으로 나누어서 순차적으로 스위칭 동작을 하도록 하였다. 또한 큰 출력전류에서 전력변환효율을 최적화하기 위하여 2MHz의 스위칭 주파수를 가지는 PWM 제어방식을 사용하였으며, Type-3 보상기법을 적용하여 전체 루프가 충분한 위상여유를 가지도록 하였다. 제안하는 DC-DC 변환기는 0.18µm BCD 공정을 사용하여 제작되었으며 0.28mm2의 면적을 차지한다. 시제품 DC-DC 변환기는 1.8V의 출력전압에서 200mA의 출력전류를 구동할 때 최대 93%의 전력변환효율을 가지며, 각각 0.04%/V와 0.11%/A의 line regulation 및 load regulation을 가진다.
Abstract
This work presents a high-efficiency low-noise PWM DC-DC buck converter based on a multi-partition switching for mobile SoC applications. The proposed DC-DC buck converter employs a multi-partition switching technique, which sequentially switches the output circuits in a properly divided interval to minimize the glitch noise of output voltages, such as overshoot and undershoot caused by high-frequency switching operation. In addition, the proposed DC-DC buck converter adopts a PWM control with a switching frequency of 2MHz to optimize power efficiency at a large output load current and Type-3 compensation circuits to achieve a enough phase margin. The prototype DC-DC buck converter with an active die area of 0.28mm2 was implemented using a 0.18µm BCD process. The power efficiency shows 93% while supplying an output current of 200mA and an output voltage of 1.8V. The measured line regulation and load regulation are 0.04%/V and 0.11%/A, respectively.
참고문헌 (23)
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