Smooth Pole Tracking Technique by Power MOSFET Array in Low-Dropout Regulators

Yung-Hsin Lin, Kuo-Lin Zheng, Ke-Horng Chen
2008 IEEE transactions on power electronics  
This paper proposes an advanced -reduction technique of pole-splitting compensations for low dropout (LDO) regulator. The output pole is load dependent and may cause the scenario of complex poles when load current changes. LDO regulators may oscillate because high-incurs the less gain and phase margins. The reasons of causing complex poles depend on the design methodology. For the design of capacitor-free LDO regulator, high-issue happens when load current changes from heavy to light. Recent
more » ... erature provides a method to alleviate the highproblem. However, large dropout voltage in case of suddenly large loads forces designers to include a small load capacitor as an indispensable component for supplying system-on-chip (SoC) systems. Different to the case of capacitor-free LDO regulators, highissue happens when load current changes from light to heavy. According to our proposed power MOSFET array, the highproblem can be alleviated and prevent LDO regulators from oscillating when load changes. Experimental results promise the stability and show the improvement of load and line regulations. Index Terms-Capacitor-free, complex pole, low-dropout regulator (LDO), power MOSFET array, -reduction.
doi:10.1109/tpel.2008.2002053 fatcat:4hsz2577qrcwli7w6fql777d6e