A low-dropout regulator with a single-transistor-control providing
improved transient response and stability is disclosed. The
single-transistor-control provides a dynamic resistance at the output of
the regulator for minimizing undershoot and overshoot, and hence improves
transient response. Since the single-control transistor reduces the
output resistance of the regulator, the output pole is pushed to a
sufficiently high frequency without affecting stability. Therefore, the
limited choice of combinations of the output capacitance and its
equivalent-series-resistance is substantially relaxed.