JAJSKF5B September 2021 – November 2022 TPSM82864A , TPSM82866A
PRODUCTION DATA
As the load current decreases, the device seamlessly enters power save mode (PSM) operation. In PSM, the converter operates with a reduced switching frequency and a minimum quiescent current to maintain high efficiency. Power save mode is based on a fixed on-time architecture, as shown in Equation 1.
The switching frequency in PSM is estimated as:
The load current at which PSM is entered is at one half of the ripple current of the inductor and it can be estimated as:
In power save mode, the output voltage rises slightly above the nominal output voltage. This effect is minimized by increasing the output capacitance.