Mobile devices and methods controlling power in mobile devices

A method of controlling power in a mobile device, the method comprising:

• generating power supply voltages using a power management integrated circuit (PMIC), wherein the PMIC is mounted on a second side of a printed circuit board (PCB) including the second side and an opposing first side;
• providing the power supply voltages to low drop-out (LDO) regulators mounted on a second side of a package substrate mounted on the first side of the PCB using first interconnects, the package substrate having a first side and the second side opposing the first side, wherein the LDO regulators are disposed between the first interconnects;
• generating output voltages in the LDO regulators in response to the power supply voltages;
• and
• providing one of the output voltages to a respective one of power domains of an integrated circuit (IC) mounted on the first side of the package substrate using second interconnects.

A mobile device comprising:

• a printed circuit board (PCB) including a first side and an opposing second side;
• a power management integrated circuit (PMIC) mounted on the second side of the PCB, wherein the PMIC generates power supply voltages in response to a battery voltage;
• a package substrate mounted on the first side of the PCB using first interconnects, wherein the package substrate includes a first side and an opposing second side;
• an integrated circuit (IC) mounted on the first side of the package substrate;
• low drop-out (LDO) regulators mounted on the second side of the package substrate, wherein the LDO regulators are disposed between the first interconnects;
• and
• high density capacitors disposed between each of the LDO regulators and the second side of the package substrate,
• wherein the PCB includes first electrical paths connecting the PMIC to the LDO regulators, and
• the package substrate includes second electrical paths connecting the LDO regulators to the IC.