A Low Dropout regulator using current buffer compensation technique

A current buffer compensation Low Dropout (LDO) regulator for portable applications is present in this paper. The current buffer compensation scheme is a current feedback amplifier, which provides low output impendence in order to move the non-dominant pole due to the large gate capacitance of the pass transistor of the LDO regulator to high frequency. This LDO circuit had been designed and implemented in a 0.35-μm CMOS processes, it occupied a chip area of 810×572 μm². The measurement results show that this circuit functions properly with supply voltage of 2.2~3.3 V and provides maximum current of 200 mA. The output voltage can be adjusted from 0.6 V to 3.1 V when the supply voltage is 3.3 V.