A new topology for a buck-boost switching regulator is provided herein.
Embodiments provide an efficient buck-boost switching regulator that
provides a regulated output voltage from an unregulated input voltage.
Embodiments include a buck-boost switching regulator topology, where the
operating mode is determined separately from the pulse-width modulated
(PWM) control signal. This topology, in one embodiment, provides a better
transient response than typical buck-boost switching regulator
topologies, where PWM control circuitry and operating mode circuitry are
combined. Furthermore, embodiments provide a buck-boost switching
regulator that allows for high efficiency when the output voltage is
close to the input voltage.