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BQ24072: Some design question about BQ24072RGTR

Troyson Li
Expert 2505 points
Part Number: BQ24072
Other Parts Discussed in Thread: BQ24074

Dear TIer,

Customer is designing with BQ24072. Below are some questions. May i get your reply ? Thanks! 

1. Is the mosfet(Q1) circuit between Vin pin with OUT pin is an Anti-Reflux circuit ? 

We are afraid there is some voltage in Vin when the Vin is unconnected and Vout connects a loads.

2. IINMAX=0.5A but the loads (Out-pin connected) may need a 1.5A sourcing supply sometimes.

Does BQ24072 could adjust the battery to discharge immediately when this situatiation happened? How long the reaction time for this process? 

3. How quick the CHG stutus changed when status changed ? No data in specification.

Appreciate for kindly reply . And we also hope if you can recommend other item which has more popular for this application.Below is request for our charge : 

1. Linear , Icharge max=500mA 

2. Include CE pin 

3. Include Termination Current Programming pin 

  • 0
    TI__Mastermind 25845 points

    Hello, 

    I am checking on the 3 questions and will get back to you with feedback this week. 

    Regarding the question of recommended part. The BQ24074 is from the same product family and has a termination current programming pin (ITERM) rather than the termination disable pin (TD) found on the BQ24072. It appears to be a good fit given your requirements.

    Best Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    TI__Mastermind 25845 points

    Hi Troyson, 

    Thank you for your patience. Please see my comments on the customer questions below. 

    1) Yes Q1 mosfet is reverse blocking. Current will not flow from BAT or OUT to VIN when input supply is unconnected. 

    2) Yes BQ24072 will adjust to discharge battery immediately when Out load current exceeds the input current limit. Below is an example of typical reaction time when Out current increases from 100mA to 1.5A with IINMAX = 0.5A. The capture shows the response time will be in the range of hundreds of usec. 

    3) Please see below waveform capture showing /CHG status pin change state in response to charge terminating (ICHG waveform dropping to 0A). In a practical sense the status change is immediate.  

    Best Regards,

    Garrett