An apparatus is provided which comprises: a first power supply rail to provide a first power supply voltage; a second power supply rail to provide a second power supply voltage, wherein the first power supply voltage is higher than the second power supply voltage; a first circuitry coupled to the first and second supply rails, wherein the first circuitry is to operate using the first supply voltage, and wherein the first circuitry is to inject charge on to the second power supply rail in response to a droop indication; and a second circuitry to detect voltage droop on the second power supply rail, wherein the second circuitry is to generate the droop indication for the first circuitry.