Patent ID: 7301313

Claim:
An apparatus comprising: an output node to coupled to a load; a primary voltage regulator to provide primary power to the output node from at least one of a first power source or a second power source; a secondary voltage regulator to selectively provide additional power to the output node from the second power source based at least in part on availability of the second power source; a first transistor receiving an input from the primary voltage regulator, wherein the first transistor is coupled to a first terminal of a first inductor, and a second terminal of the first inductor is connected to the output node, such that the primary and secondary voltage regulators are coupled to the output node in parallel; a second transistor receiving an input from the secondary voltage regulator wherein the second transistor is coupled to a first terminal of a second inductor and a second terminal of the second inductor is connected to the output node; wherein, the secondary voltage regulator has a greater power capacity than the primary voltage regulator; and the apparatus further comprises: first and second feedback networks to detect power supplied to the output node and to control the primary and secondary voltage regulators, and to detect if the second power source is available, and to detect if a load power reaches a threshold level, and wherein the first and second feedback networks monitor operating conditions of the apparatus, and wherein the first and second feedback networks enable the secondary voltage regulator to supply additional power to the output node if the second power source is available and the load power reaches a threshold level or the operating conditions require the additional power.