Current equalization scheme for parallel low-dropout regulators

Parallel connected low-dropout regulators are used to share the current delivered to a large power plane. Current sharing helps supply large load currents while still using individual low capacity regulators that can be optimized for other attributes such as PSRR and transient response. However, in presence of mismatch in the LDOs, the performance of current sharing degrades significantly. The idea proposed in this paper addresses the load current equalization aspect of parallel connected LDOs in the presence of large within-die variations.