US 11,934,217 B2
IC card regulator
Albin Pevec, Ljubljana (SI); Nejc Suhadolnik, Preserje (SI); Vinko Kunc, Ljubljana (SI); and Maksimiljan Stiglic, Maribor (SI)
Assigned to STMicroelectronics Razvoj Polprevodnikov D.O.O., Ljubljana (SI)
Filed by STMicroelectronics Razvoj Polprevodnikov D.O.O., Ljubljana (SI)
Filed on Jan. 23, 2023, as Appl. No. 18/158,170.
Claims priority of application No. 22158957 (EP), filed on Feb. 25, 2022.
Prior Publication US 2023/0273634 A1, Aug. 31, 2023
Int. Cl. G05F 1/575 (2006.01)
CPC G05F 1/575 (2013.01) 18 Claims
OG exemplary drawing
 
1. A linear voltage regulator comprising:
a first transistor coupled between a first input terminal and an output terminal, the first input terminal adapted to receive a first voltage, and the output terminal adapted to provide a regulated voltage;
a second transistor coupled between a second input terminal and the output terminal, the second input terminal adapted to receive a second voltage; and
an amplifier of a difference between a third voltage proportional to the regulated voltage at the output terminal and a reference voltage, an output of said amplifier being selectively coupled to a control terminal of the first transistor and to a control terminal of the second transistor, the amplifier being supplied by a fourth voltage corresponding to a highest voltage of the first voltage and the second voltage;
a comparator configured to: compare the first voltage and the second voltage, and control switches selectively coupling the first input terminal and the second input terminal to an output configured to provide the fourth voltage;
a first diode coupled between the first input terminal and a supply terminal of the comparator;
a second diode coupled between the second input terminal and the supply terminal of the comparator; and
a capacitor coupled between the supply terminal of the comparator and a supply node.