Hi Team
Customer find the BQ25790 will work in buck converter mode during fast charge stage when the configuration is 1.5MHZ/2s battery.
I preproduced the phenomenon on our EVM. Set up: Vin 9V, 2S battery, 1.5M frequency.
it will works at 1.5M Hz after entering fast charge. and converter's frequency would transform to 750MHz gradually with the Battery voltage rose. and finally worked in buck-boost mode with the Vbat rose continue.
There are some question hope can get your support
1、Does it normal works at buck mode with 750Mhz frequency when configuration is 1.5MHZ? Because I don't noticed there is description about this phenomenon on datasheet
2、if it works normal, Can you explain why it happen, and the principle of conversion between these modes_1.5M buck,750M buck, buck-boost.