In CCM operation, inductor current has a continuous triangular waveform. The HS switch is on at the beginning of a switching cycle and the LS switch is turned off the end of each switching cycle. In auto mode, the LM73605-Q1/6-Q1 in CCM when the load current is higher than ½ of the peak-to-peak inductor current (I_Lripple). In FPWM mode, the LM73605-Q1/6-Q1 in CCM, regardless of load.

In CCM operation, the switching frequency is typically constant, unless t_ON-MIN, t_OFF-MIN, or I_PEAK-MIN conditions are met. The constant switching frequency is determined by RT pin setting, or the external synchronization clock frequency. The duty cycle is also constant in CCM: D = V_OUT / V_IN if loss is ignored, regardless of load. The peak-to-peak inductor ripple is constant with the same V_IN and V_OUT, regardless of load.

With very high or very low supply voltages, when the t_ON-MIN or t_OFF-MIN condition is met, the frequency reduces to maintain V_OUT regulation with even higher or lower V_IN, respectively. When the I_{PEAK_MIN} condition is met in auto mode, the switching frequency folds back to provide higher efficiency. I_{PEAK_MIN} is disabled in FPWM mode.