Analog-Assisted Digital Low Dropout Regulator (AAD-LDO) with 59% Faster Transient Response and 28% Ripple Reduction

K. Mori, Y. Okuma, X. Zhang, H. Fuketa, T. Sakurai, M. Takamiya
2013 Extended Abstracts of the 2013 International Conference on Solid State Devices and Materials   unpublished
An analog-assisted digital low dropout regulator (AAD-LDO) is proposed to solve the problems of a slow transient response and a large output ripple in a conventional digital LDO. In AAD-LDO, a fast-response auxiliary analog LDO is added to the digital LDO in parallel. Compared with the digital LDO, the measured AAD-LDO in 180nm CMOS reduces the transient response time and the output ripple by 59% and 28%, respectively, at the same current efficiency of 97.1%.
doi:10.7567/ssdm.2013.h-2-4l fatcat:koputtosqrfq7aaxlahmd6kdca