	US 12,265,412 B2
	Low dropout regulator circuits, input/output device, and methods for operating a low dropout regulator
Huan-Neng Chen, Taichung (TW); Yen-Lin Liu, Taichung (TW); Chia-Wei Hsu, New Taipei (TW); Jo-Yu Wu, Hsinchu (TW); Chang-Fen Hu, Hsinchu (TW); Shao-Yu Li, Hsinchu (TW); and Bo-Ting Chen, Fengyuan (TW)
Assigned to Taiwan Semiconductor Manufacturing Company, Ltd., Hsinchu (TW)
Filed by Taiwan Semiconductor Manufacturing Company, Ltd., Hsinchu (TW)
Filed on Apr. 11, 2024, as Appl. No. 18/633,481.
Application 18/633,481 is a continuation of application No. 17/650,668, filed on Feb. 11, 2022, granted, now 11,966,241.
Claims priority of provisional application 63/220,331, filed on Jul. 9, 2021.
Prior Publication US 2024/0255977 A1, Aug. 1, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G05F 1/575 (2006.01); G05F 1/595 (2006.01); H03K 19/0175 (2006.01)

CPC G05F 1/595 (2013.01) [G05F 1/575 (2013.01); H03K 19/017509 (2013.01)]

19 Claims

1. A circuit, comprising: an operational amplifier configured to output a driving signal according to a feedback voltage associated with an output voltage and a reference voltage; a pass gate circuit comprising a plurality of current paths, the plurality of current paths being controlled by the driving signal, wherein the pass gate circuit is configured to operate in a plurality of modes; and a logic circuit configured to determine a selected mode from the plurality of modes according to a plurality of enable signals respectively received from a plurality of output enable pins, wherein a hysteresis comparator is connected to the operational amplifier and configured to compare the driving signal with a second reference voltage to separately turn on or off switches in the plurality of current paths.