For PFM version, when the load current is lower than half of the peak-to-peak inductor current in CCM, the device operates in discontinuous conduction mode (DCM), also known as diode emulation mode (DEM). In DCM operation, the LS switch is turned off when the inductor current drops to I_{LS_ZC} (150 mA typical) to improve efficiency. Both switching losses and conduction losses are reduced in DCM when compared to forced CCM operation at light load.

At even lighter current load, pulse frequency modulation (PFM) mode is activated to maintain high efficiency operation. When either the minimum on time, t_{ON_MIN}, or the minimum peak inductor current, I_{PEAK_MIN} (typically 750 mA) is reached, the switching frequency decreases to maintain regulation. In PFM mode, switching frequency is decreased by the control loop to maintain output voltage regulation when load current reduces. Switching loss is further reduced in PFM operation due to less frequent switching actions. The output current for mode change depends on the input voltage, inductor value, and the programmed switching frequency. For applications where the switching frequency must be known for a given condition, the transition between PFM and CCM must be carefully tested before the design is finalized.