Power supply interface having multiple voltage sources

摘要

Aspects of the present disclosure are directed to circuits, apparatuses, and methods for power management. According to an example embodiment, an apparatus includes a low drop-out (LDO) voltage-regulation circuit configured to generate a regulated voltage from a voltage provided to a supply terminal of the LDO voltage-regulation circuit. The apparatus also includes switching circuitry coupled to the LDO voltage-regulation circuit and to a plurality of voltage sources. The voltage sources include at least power line carried along with a data bus and another voltage source. Each of the plurality of voltage sources provides a respectively different voltage range. The switching circuitry is configured, in response to a power-related condition of the plurality of voltage sources and while maintaining power to the LDO voltage-regulation circuit, to select and couple one of the voltage sources to the supply terminal and uncouple other ones of voltage sources from the supply terminal.

主权项

1. An apparatus comprising:
a low drop-out (LDO) voltage-regulation circuit configured and arranged to generate a regulated voltage from a voltage provided to a supply terminal of the LDO voltage-regulation circuit; and switching circuitry coupled to the LDO voltage-regulation circuit and to a plurality of voltage sources including a power line carried along with a data bus and another voltage source, each of the plurality of voltage sources providing respectively different voltage ranges, the switching circuitry is configured and arranged, in response to a power-related condition of the plurality of voltage sources and while maintaining power to the LDO voltage-regulation circuit, to select and couple one of the power line and the other voltage source for providing energy to the supply terminal and un-couple the other of the power line and the other voltage source from the supply terminal.