What DC/DC convertor to use with BQ24617 charger to have 12V output regardless if the power comes from adapter or battery?

The bq24617 is a step down (buck) charge that has no ability to boost from the battery.

We have some turbo boost chargers but these only boost the battery voltage to supplement the input voltage.  If the input voltage is not present then the battery voltage is connected to the system.  From my understanding, this is not what you want.

The best solution for your application is to search for a boost converter for a 2A output at TI.com and put this between the system output of the charger and the system.

I would use a 9 to 11V adapter.  This means that the boost converter's input would see ~10V from the adapter if inserted, and the battery voltage if no adapter.  The boost converter would boost either input to 12V output.

Hi Charles,

I think we miss understand. I need a boost converter to put between charger and system. My system need's to be supplied with 12V. When adapter is present on charger output is 12V and converter just needs to pass it to system input. But when adapter is not present on charger output is 6 to 8.4V, so I need to boost that to 12V on converter output so that I could supply my system. I tried putting boost converter in battery path but then I have battle when there is adapter and battery are on who gives bigger voltage (for example dc/dc converter gives 12.1V and adapter 12V and system is supplied from battery although adapter power is present). I need a converter who can boost input voltage of between 5V to 14V (input voltage is between 6V and 12V but just to be sure) to 12V output (something like SEPIC converter). I asked on this Battery management because I use BQ24617, but this topic is maybe more for other Power management topic.