An apparatus for power management, comprising: a top power-domain and a bottom power-domain arranged in a stacked configuration; a current sink/source sensor configured to monitor a power-supply to inter-power-domain sink/source-current and to generate a current mismatch signal if the power-supply to inter-power-domain sink/source-current exceeds a threshold range, wherein the power-supply to inter-power-domain sink/source-current is a current either supplied to or sunk from an electrical node in between the top power-domain and the bottom power-domain; and a current imbalance controller coupled to receive the current mismatch signal and configured to generate a set of power-domain control signals, including: a top power-domain frequency selection signal and a bottom power-domain frequency selection signal generated by a power-domain frequency controller coupled to the current imbalance controller; and a top power-domain voltage selection signal and a bottom power-domain voltage selection signal generated by a power-domain voltage controller coupled to the current imbalance controller, to control the top and bottom power-domains (102, 108) in order to reduce an absolute value of the power-supply to inter-power-domain sink/source-current wherein the current imbalance controller is configured to target a reduced current mismatch signal by varying the top power-domain voltage selection, the bottom power-domain voltage selection, the top power-domain frequency selection and the bottom power-domain frequency selection while taking into account one or more constraints of the system, wherein the constraints of the system include one or more of: a minimum throughput of individual power-domains; a combined total throughput of two-power-domains; a voltage headroom for individual power-domains; a total headroom for two power-domains; and an allowed frequency vs voltage of each power-domain and wherein the current imbalance controller is configured to target the reduced current mismatch signal by altering at least two of the: top power-domain frequency selection; bottom power-domain frequency selection; top power-domain voltage selection; and bottom power-domain voltage selection, according to a recursive algorithm a top power-domain and a bottom power-domain arranged in a stacked configuration; a current sink/source sensor configured to monitor a power-supply to inter-power-domain sink/source-current and to generate a current mismatch signal if the power-supply to inter-power-domain sink/source-current exceeds a threshold range, wherein the power-supply to inter-power-domain sink/source-current is a current either supplied to or sunk from an electrical node in between the top power-domain and the bottom power-domain; and a current imbalance controller coupled to receive the current mismatch signal and configured to generate a set of power-domain control signals, including: a top power-domain frequency selection signal and a bottom power-domain frequency selection signal generated by a power-domain frequency controller coupled to the current imbalance controller; and a top power-domain voltage selection signal and a bottom power-domain voltage selection signal generated by a power-domain voltage controller coupled to the a top power-domain frequency selection signal and a bottom power-domain frequency selection signal generated by a power-domain frequency controller coupled to the current imbalance controller; and a top power-domain voltage selection signal and a bottom power-domain voltage selection signal generated by a power-domain voltage controller coupled to the current imbalance controller, to control the top and bottom power-domains (102, 108) in order to reduce an absolute value of the power-supply to inter-power-domain sink/source-current wherein the current imbalance controller is configured to target a reduced current mismatch signal by varying the top power-domain voltage selection, the bottom power-domain voltage selection, the top power-domain frequency selection and the bottom power-domain frequency selection while taking into account one or more constraints of the system, wherein the constraints of the system include one or more of: a minimum throughput of individual power-domains; a combined total throughput of two-power-domains; a voltage headroom for individual power-domains; a total headroom for two power-domains; and an allowed frequency vs voltage of each power-domain and a minimum throughput of individual power-domains; a combined total throughput of two-power-domains; a voltage headroom for individual power-domains; a total headroom for two power-domains; and an allowed frequency vs voltage of each power-domain and wherein the current imbalance controller is configured to target the reduced current mismatch signal by altering at least two of the: top power-domain frequency selection; bottom power-domain frequency selection; top power-domain voltage selection; and bottom power-domain voltage selection, according to a recursive algorithm top power-domain frequency selection; bottom power-domain frequency selection; top power-domain voltage selection; and bottom power-domain voltage selection, according to a recursive algorithm