Patent ID: 8344713

Claim:
A voltage regulating system that receives an external reference voltage and generates an output voltage, the system comprising: a low dropout (LDO) regulator that includes: an error amplifier for comparing the external reference voltage and a scaled-down version of the output voltage to generate an error amplified signal; and a pass transistor having a gate connected to the error amplifier, a source connected to a voltage source, and a drain connected to a load, wherein the pass transistor generates the output voltage based on the error amplified signal; a transient response circuit, connected to the LDO regulator, for improving a transient response of the LDO regulator, the transient response circuit including: a first current mirror connected to the pass transistor, wherein an input terminal of the first current mirror is connected to the drain of the pass transistor and an output terminal of the first current mirror is connected to the gate of the pass transistor; and a second current mirror connected to the pass-transistor, wherein an input terminal of the second current mirror is connected to the drain of the pass transistor and an output terminal of the second current mirror is connected to the gate of the pass transistor.