Abstract: Current regulating techniques utilizing buck-boost circuitries are disclosed. A buck switching device is used in an input stage of a buck-boost circuitry of some embodiments for regulating an input current thereof, and a boost switching device is used in an output stage thereof. A control system is used to set the buck switching device into a closed state at a beginning of each cycle of a periodic timing signal, and open the buck switching device to cause the input current to converge towards a defined target current value, while an unrelated controller changes in each cycle the boost switching device into an open state based on an input/output dependent force-on duty cycle value, and thereafter change the boost switching device back into the closed state whenever the output current of the boost circuit drops below a determined threshold current value.