voltage range at the current load additionally the adapter current into the system from the external power source may be measured and reported to the pmic the main pmic may decide the optimal target external power source voltage and send the request to the external power source e g usb or adapter the pmic may determine the external source type e g usb type or adapter type and signal the external source for voltages that the external source is capable of producing an algorithm in the pmic may minimize power loss of the smbc smpss and boost smps within the voltage ranges available from the particular external power source for example in one embodiment the external source voltage may be advantageously higher than the current system power plus a guardband divided by the maximum connector current limit for example changing conditions such as modem wireless activity application processor e g arm graphics processors etc activity battery charging etc may cause the system to signal the external power source to change the external voltage supplied to the system for example benefits of these techniques may include lower temperatures while battery charging more thermal budget for cpu and graphics intensive workloads additionally faster battery charging may be achieved because there is better thermal room for the smbc further improved efficiencies and thermal performance may result in reduced form factor thinner designs and allow the use of a standard usb connector that may have current limitations for example embodiments of the present invention may be implemented using high.