When constant frequency operation is more important than light load efficiency, the MODE/SYNC input of the LMZM23600 device must be pulled high or a valid synchronization input must be provided. This activates forced-PWM-mode operation. After activated, this feature ensures that the switching frequency stays constant across the entire load current range, while operating between the minimum and maximum duty cycle limits. The diode emulation feature is turned off in this mode. This means that the device remains in CCM under light loads. The switching frequency in forced PWM mode is only reduced when the input voltage-to-output voltage ratio results in minimum on-time limitation (ADJ version only) or minimum off-time limitation near dropout.

This feature can be activated and deactivated while the part is regulating without removing the load. This feature activates and deactivates gradually, preventing perturbation of output voltage. When in FPWM mode, a limited reverse current is allowed through the inductor allowing power to pass from the regulators output to its input.