Abstract: A power management integrated circuit and a method of operating the power management integrated circuit are disclosed. The power management integrated includes an upper regulator circuit that receives a system voltage as an input and outputs a first output voltage; a lower regulator circuit having the first output voltage as an input; and a Kelvin switch circuit connected between the upper regulator circuit and the lower regulator circuit. The Kelvin switch circuit includes a plurality of switches that connect any one of a plurality of upper regulators included in the upper regulator circuit to any one of a plurality of lower regulators included in the lower regulator circuit.

Abstract: A power management device includes a main power management integrated circuit (PMIC) and at least one sub PMIC that communicates with the main PMIC through a dedicated pin. The main PMIC includes a first pin, enables first functions associated with a first initial operation based on a battery voltage during a stand-by period before generating first output voltages based on the battery voltage and applies a first sub enable signal to the at least one sub PMIC through the first pin based on a power-on signal after completing the first initial operation. The at least one sub PMIC includes a second pin, receives the first sub enable signal through the second pin and enables second functions associated with a second initial operation based on the battery voltage, in response to an activation of the first sub enable signal.

Abstract: A power management device includes a main power management integrated circuit (PMIC) and at least one sub PMIC that communicates with the main PMIC through a dedicated pin. The main PMIC includes a first pin, enables first functions associated with a first initial operation based on a battery voltage during a stand-by period before generating first output voltages based on the battery voltage and applies a first sub enable signal to the at least one sub PMIC through the first pin based on a power-on signal after completing the first initial operation. The at least one sub PMIC includes a second pin, receives the first sub enable signal through the second pin and enables second functions associated with a second initial operation based on the battery voltage, in response to an activation of the first sub enable signal.

Abstract: A power management integrated circuit and a method of operating the power management integrated circuit are disclosed. The power management integrated includes an upper regulator circuit that receives a system voltage as an input and outputs a first output voltage; a lower regulator circuit having the first output voltage as an input; and a Kelvin switch circuit connected between the upper regulator circuit and the lower regulator circuit. The Kelvin switch circuit includes a plurality of switches that connect any one of a plurality of upper regulators included in the upper regulator circuit to any one of a plurality of lower regulators included in the lower regulator circuit.