VOLTAGE REGULATOR, APPLICATION-SPECIFIC INTEGRATED CIRCUIT AND METHOD FOR PROVIDING A LOAD WITH A REGULATED VOLTAGE

摘要

A voltage regulator (200) for digital loads (203) combines a closed loop regulation circuit (207,210) with an open loop topology. A (closed loop) transistor (210) and a bank of (open loop) transistors (218, 220, 221 ) share the same voltage source VDD and gate control current. Each of the bank of transistors is sized to match different current load requirements and one or more may be switched in or out as appropriate when the digital load transitions from one operating mode to another. The regulator has good DC load regulation and unconditional stability regardless of output capacitance.