公开(公告)号：EP4102335A1

公开(公告)日：2022-12-14

申请号：EP22305741.5

申请日：2022-05-19

Applicant: STMicroelectronics (Rousset) SAS ,  STMicroelectronics S.r.l.

Inventor： MANGANO, Daniele ,  TUDOSE, Andrei ,  CLERICI, Francesco ,  BUTTA', Pasquale

IPC: G05F1/46 ,  G06F1/26

Abstract: A circuit (10), such as a microcontroller unit, MCU for instance, comprises a first node (VBAT) configured to be brought to a first voltage such as the supply voltage from a battery (LB), a second node (VDDIO) configured to be coupled (180) with an electrically powered device (ED) such as an external memory to provide electrical supply power thereto, and a voltage regulator (100) such as a LDO regulator embedded in the circuit (10) intermediate the first node (VBAT) and the second node (VDDIO). The voltage regulator (100) is activatable in a first, startup mode during which the voltage regulator (100) applies to the second node (VDDIO), and thus to the external device (ED), a voltage increasing towards a supply threshold (160). The circuit (10) comprises control circuitry (20) activatable (16, 160, vdig_en, 22) in response to the voltage at the second node (VDDIO) reaching the supply threshold (160) to bring the voltage regulator (100) to a second mode of operation (1008) wherein a programmable regulated voltage higher than the supply threshold is applied to the second node (VDDIO). The circuit (100) is configured (162) to receive low-power operation requests (1010) and, in response to low-power operation requests (1010) received, to deactivate a first high-drive regulator circuitry (102) in the voltage regulator (100) and activate a second low-power regulator circuitry (104) thus providing a third, low-power mode of operation of the circuit (10).