JAJSPY6 December 2023 LMR66410 , LMR66420 , LMR66430
PRODUCTION DATA
The LMR664x0 can have two behaviors while lightly loaded. One behavior, called auto mode operation, allows for seamless transition between normal current mode operation while heavily loaded and highly efficient light load operation. Note that for output voltages between 1-V and 2-V multi-pulsing behavior can be observed on the switch node waveform when the device transitions from PFM to PWM mode. The other behavior, called FPWM mode, maintains full frequency even when unloaded. Which mode the device operates in depends on which variant from this family is selected. Note that all parts operate in FPWM mode when synchronizing frequency to an external signal.
The light load operation is employed in the device only in auto mode. The light load operation employs two techniques to improve efficiency:
Note that while these two features operate together to improve light load efficiency, they operate independently.