Patent ID: 8896279

Claim:
A multi-phase non-inverting buck boost voltage converter, comprising: a plurality of buck boost converters, wherein each buck boost converter of the plurality of buck boost converters is associated with a separate phase of the multi-phase non-inverting buck boost voltage converter, for generating a regulated output voltage responsive to an input voltage; a plurality of current sensors, wherein each current sensor of the plurality of current sensors is coupled to an associated buck boost converter of the plurality of buck boost converters, for monitoring an input current to the associated buck boost converter and generating a current sense signal for the associated phase; a plurality of buck boost mode control circuits, wherein each buck boost mode control circuit of the plurality of buck boost mode control circuits is coupled to an associated buck boost converter, for controlling the associated buck boost converter utilizing peak current mode control in a buck mode of operation and valley current mode control in a boost mode of operation responsive to an error voltage and the current sense signal for the associated phase, wherein each buck boost mode control circuit of the plurality of buck boost mode control circuits includes circuitry for generating a buck control signal or a boost control signal responsive to a maximum duty cycle detection signal, the error voltage and the current sense signal, the maximum duty cycle detection signal being responsive to a maximum duty cycle condition in the buck mode of operation or the boost mode of operation, and wherein the plurality of buck boost mode control circuits provides current balancing between the phases; and a voltage error circuit coupled to the plurality of mode control circuits and the plurality of buck boost converters, for generating the error voltage responsive to the regulated output voltage.