A new dynamic fast-settling low dropout regulator with programmable output voltage

The new dynamic fast settling low dropout regulator (LDO) is presented for minimizing setting time in voltage switched by utilizing the multi-voltage control technique and dynamic fast-settling mechanism The proposed LDO provides multiple discrete voltage levels of output by using multi-voltage control technique Meanwhile, the settling time is reduced by utilizing dynamic fast-settling mechanism during output voltage switched Furthermore, we propose the new comparator architecture to avoid the problems of overcharging and over-discharging at feedback node Vp and output node V_out. The simulation results are based on 0.35μm CMOS process. The transient time of the proposed LDO is reduced from 4.2ms to 22fis. Moreover, the power dissipation of the multi-voltage control and dynamic fast-settling mechanism is only 0.3mWin a heavy load condition.