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BQ24616: Power Management Issue

Sujon Basak
Prodigy 30 points
Part Number: BQ24616

In my application the adapter would provide around around 20 V supply and the problem is SYSTEM cannot take that much high power. So, my question is can I use a Buck before sending the power to the SYSTEM?

  • 0
    TI__Mastermind 24075 points

    Hi Sujon,

       This depends on your application. With BQ24616 it employs direct powerpath, meaning that if adapter is present and above SLEEP threshold, then SYS = VADAPTER - voltage drop across input reverse blocking FETs. If adapter is removed, or if SLEEP condition is satisfied, then SYS = VBATTERY - voltage drop across FET controlled by BATDRV.

    Potential issue would be if system rail requires more than battery voltage, and then if adapter is removed, as buck converter would not suffice.

    1. Will you require battery to also provide input to system in event of adapter removal
    2. Is it okay for SYSTEM to be unpowered in event of no adapter (meaning no powerpath)
    3. Will adapter in your system also be connected

  • 0 in reply to Kedar Manishankar
    Prodigy 30 points

    Actually, my system can take maximum power of 13 V and adapter is going to give a supply of around 20 V. When the adapter is connected, the system is going to get power from the adapter and when it is removed the battery(3 cell) is going to provide power(12.6 V) to the system. So, I was thinking of using a BUCK in the encircled area of the circuit as shown in the above figure. Can you please tell me if it is a viable solution to my problem? 

  • 0 in reply to Sujon Basak
    TI__Mastermind 24075 points

    Answered in other E2E post.