Power Supply Module for System on Chip with Wide Input Range

This paper presents a power supply module (PSM) for SoCs (system on chip). This module, which is based on an improved LDO, has a wide input range and switchable power path. The proposed PSM can output a steady voltage of 6v as input voltage varies between 5.7 V-30 V, with a max error of 4.3%. It also provides a flexible power path. The SoCs will be supplied by either internal LDO or external power supply directly in corresponding applications. Further more, because of fast step of load condition in SoCs, a speedup loop was introduced to increase the stabilizing speed of output voltage, and up to 26.9% boost can be achieved according to simulation. The design accomplished under the 1.5 um BCD (Bipolar-CMOS-DMOS) technology.