Patent ID: 7701690

Claim:
A power supply control circuit comprising: a low drop out circuit that comprises an operational amplifier having an output coupled to a low drop out transistor; a switcher circuit having an output coupled to the low drop out circuit, the switcher circuit configured to provide a switcher operating voltage to the low drop out transistor; and load transient suppression circuitry configured to suppress a load transient in the switcher operating voltage that is provided to the low drop out transistor, wherein the load transient suppression circuitry comprises: a preload control signal circuit configured to generate a preload control signal; an active current source responsive to the preload control signal; a comparator configured to determine whether a specified load is present at the output of the low drop out circuit; and a flip flop circuit configured to reset the preload control signal when the comparator determines that the specified load is present at the output of the low drop out circuit.