Patent ID: 11906995
Assignee: STMICROELECTRONICS S.R.L.
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A circuit, comprising:
a first voltage input node configured to receive a supply voltage from a first power supply source;
a second voltage input node coupled in a first circuit configuration to the supply voltage and in a second circuit configuration to a ground voltage;
a low voltage regulator circuit coupled to receive the supply voltage from the second voltage input node and output a first regulated voltage;
an operational circuit configured to generate control signals;
a switch configured to selectively apply the first regulated voltage to the operational circuit in response to an enable signal;
a voltage regulator coupled to the second voltage input node and including first regulator circuitry and second regulator circuitry;
wherein in the first circuit configuration the first regulator circuitry is controlled in response to the control signals from the operational circuit to provide full-power operation of the voltage regulator in generating a second regulated output voltage at an output voltage node and the second regulator circuitry is controlled in response to the control signals from the operational circuit to provide low-power operation of the voltage regulator in generating the second regulated output voltage at the output voltage node;
wherein in the second circuit configuration the first regulator circuitry and second regulator circuitry are not operational;
wherein at power-on and in the first circuit configuration the control signals activate the first regulator circuitry and deactivate second regulator circuitry; and
wherein in the first circuit configuration when the operational circuit is not active the control signals deactivate the first regulator circuitry and activate second regulator circuitry.