An event driven compensation low dropout regulator with adaptive self oscillating cross-feedback comparator and parallel shift register

With the development of electric vehicles (EVs), many vehicle sensors are gradually being integrated into electric cars. To enable vehicles to perform functions more quickly, in the power management system, higher transient response and faster recovery times becomes an emphasis. This paper presents "An Event Driven Compensation Low Dropout Regulator with Adaptive Self Oscillating Cross-Feedback Comparator and Parallel Shift Register". To accelerate chasing time, an adaptive frequency oscillator and four parallel shift registers are designed, allowing the circuit to operate at double the actual frequency, substantial reducing chasing time, and achieving low power consumption once a steady state is reached. The oscillator in this work apart from conventional ones is that it is composed of two comparators. By providing cross-feedback to each other, it can generate two clocks with different phases but same frequency. This oscillator allows the circuit to switch frequencies between 200MHz, 100MHz, and 10MHz, without the need for capacitors can achieve a fast-chasing time of <100ns and a low power consumption of 29.63μA. In the transient compensation circuit can detect transient conditions at any time, and compensation power is added afterward. This enables the circuit to quickly restart and keeps the transient voltage variation below 15%.