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A push-pull multi-loop architecture for the digital low drop-out (D-LDO) regulators is presented with small variations of output voltage and 200 mA load capacity. The propose D-LDO adopts voltage peak detector (VPD) to observe the output voltage ripples. Once undershoot or overshoot on output voltage is detected, the push-pull feedback loop is quickly triggered, which minimizes the voltage shoots even if the load current changes abruptly. Meanwhile, the shift register (S/R) feedback loopdoi:10.1587/elex.15.20180611 fatcat:toy5e5u2xrcmngk4iuyd2uygsu