DDI용 출력전압 가변 전원회로 설계

In this paper, we design a power circuit with variable output voltage for display driver ICs. The power supply operates in two modes, SFM (switching frequency modulation) and PWM (pulse width modulation), according to load currents to have better power efficiency. The proposed circuit has been realized with the Magnachip 0.35㎛ CMOS process and simulated using Hspice. The simulation results show that our circuit produces the output voltage range of -1.0V ~ -0.7V maximum 81.1% power efficiency at load currents 0 ~ 250mA.