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An On-Chip Digital Soft-Start Circuit for Integrated DC-DC Buck Converter

In this paper, a soft-start circuit is presented by taking advantage of a digital control technique to impede the inrush current and output voltage overshoot effectively during the start-up period of the DC-DC converter. The purpose of introducing a simple digital approach is to restrain the ramping of the reference voltage of the error amplifier during the starting phase of the converter. This digital approach works on the principle of charging a tiny capacitor (300 fF) by a current source to replace the common reference voltage. The proposed architecture fully integrated on the same chip; eliminates the requirement of any external components which leads to a reduction in the chip area as well as the cost. This proposed design is implemented with a voltage mode DC-DC buck converter using SCL 0.18-μm standard CMOS technology. Simulation results indicate that the soft-start circuit is capable of reducing the inrush current and the out voltage of the buck converter also increases smoothly.