POWER SUPPLY CIRCUIT

摘要

An apparatus for selecting either a High VIN path or a Low VIN path from a voltage source to a low voltage circuit is disclosed. The apparatus has a clamped step down circuit operable to select the High VIN path when a voltage level from the voltage source is above or equal to a pre-determined voltage level and, a power supply control circuit operable to select the Low VIN path when the voltage level from the voltage source is below the pre-determined voltage level.