BQ24780S: Does BQ24780s have OOA Light load operation mode ?

Hello Jiayu,

The BQ24780s does not have a PFM (pulse frequency modulation) mode for light-load, and so the switching frequency is always at 600 kHz / 800 kHz / 1 Mhz.  It has both DCM and async switching at light load (7.3.6.2 and 7.3.6.3 in the datasheet) -- but neither of these features changes the switching frequency.

Some of our other devices, such as the BQ2571x, have a PFM mode in light load, and these devices also have an OOA feature to guarantee that the PFM frequency remains above 25 kHz, but this isn't needed on BQ24780s since it does not have PFM switching.

Regards,

Steve

Hi Steve 

Thank you for you reply.

My pleasure Jiayu!

Steve