关键词: Boost型/Cuk型, DC-DC转换器, 单输入反馈环路, 时钟同步

Abstract: A chip which is used as Boost/Cuk DC-DC converter is proposed to this paper.It controls the output voltage to be constant through peak-current-mode and PWM control mode,which containing an internal 2 A,40 V power switch.A novel single input feedback loop makes the chip be configured as either a boost converter or a cuk converter,achieving positive or negative voltage output.The chip is designed and fabricated with ASMC 0.35 μm 5 V/60 V BCD process with input voltage ranged from 2.5 V to 30 V,with up to 2.5 MHz switching frequency.The typical application is generating 12 V at 550 mA or-12 V at 350 mA from 5 V input.The switching frequency of the chip can be synchronized to an external clock.

Key words: Boosttype/Cuktype, DC-DC converter, single input feedback loop, clock asynchronization