US 11,966,241 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 Feb. 11, 2022, as Appl. No. 17/650,668.
Claims priority of provisional application 63/220,331, filed on Jul. 9, 2021.
Prior Publication US 2023/0009027 A1, Jan. 12, 2023
Int. Cl. G05F 1/595 (2006.01); G05F 1/575 (2006.01); H03K 19/0175 (2006.01)
CPC G05F 1/595 (2013.01) [G05F 1/575 (2013.01); H03K 19/017509 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a voltage divider circuit configured to generate a feedback voltage according to an output voltage;
an operational amplifier configured to output a driving signal according to the feedback 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 and connected in parallel between the voltage divider circuit and a power reference node, wherein the pass gate circuit is configured to operate in a plurality of modes; and
a logic circuit configured to determine one of the plurality of modes as a selected mode according to a plurality of enable signals respectively received from a plurality of output enable pins.