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BQ25606: Selection of the Battery Charger IC

Arati Paghadal
Prodigy 40 points
Part Number: BQ25606
Other Parts Discussed in Thread: TPS63027

We have requirement for the single cell 3.7V Li-ion/Li-Po battery charger with inbuilt over charge and discharge protection. And we also need the Buck and boost converter for the regulated output voltage ( 3.3V and 4V) at the output end. The input charger supply is 5V micro USB.

 

This regulated power supply will be used for ESP32 nodemcu and GSM sim880C. The SIM880C will required 4V and 2mA burst current on power up and nodemcu will be operated on 3.3V.

 

We came across with the TI BQ25606 Battery Charger IC, does this IC suits the requirement of over charge and under discharge protection with buck and boost converter?

 

Can you suggest us o

  • 0
    TI__Genius 11850 points

    Hi Arati,

    The BQ25606 does have battery overvoltage protection and battery over-discharge protection, as described in Section 8.3.8.5 of the datasheet. However, please note that Vsys_min = 3.5 V, so VSYS will always be regulated above 3.5 V. Figure 14 below shows the relationship between VSYS and VBAT.

    Therefore, if VSYS must be regulated to 3.3 V, you may want to look into adding an LDO.

    Best regards,

    Angelo

  • 0 in reply to Angelo Zhang87
    Prodigy 40 points

    Hello Angelo,

    As you mentioned VSYS will always be regulated above 3.5 V. So can i get regulated 4V supply at VSYS ?
     And We also need 2A burst current at power up.


    Kindly also suggest us the other suitable Battery Management IC with the required specification.

  • 0 in reply to Arati Paghadal
    TI__Genius 11850 points
    Hi Arati,

    No, VSYS will not be regulated at 4 V. Assuming your battery charge voltage is 4.2 V, then VSYS can range from about 3.68 V (Vsys_min + 180 mV) to 4.25 V (VBAT + 50 mV), as shown in Figure 14.

    How strict are the 3.3 V and 4 V requirements? Do they need to be tightly regulated, or is it okay to supply them with a slightly higher voltage?

    Also, can you give me some more information about your application? Will you still need to supply 3.3 V and 4 V when the 5 V micro USB input is not connected?

    Best regards,
    Angelo
  • 0 in reply to Angelo Zhang87
    Prodigy 40 points

    Hello Angelo,

    As you suggested we use LDO for 3.3 v, thanks.

    We can go with +0.2v in case of 4v requirement, but in this case we need 2A bust current on device initialisation.

    Yes, we need constant 3.3/4v in both case when external power source is available or not available (5v micro usb).

    Thanks & Regards

    Arati

  • 0 in reply to Arati Paghadal
    TI__Genius 11850 points
    Hi Arati,

    Unfortunately, this is not something that can be done with a battery charger IC alone. Regulating a 4 V output is especially problematic because this is right around the battery voltage as it is being charged, so VSYS (which ranges from about 3.68 V to 4.25 V) needs to be stepped up in some cases and stepped down in other cases.

    In order to implement the 3.3 V and 4 V rails, you will need to add more components to the output of the charger, such as a buck-boost converter or an LDO (to regulate 3.3 V) followed by a boost converter (to regulate 4 V).

    Best regards,
    Angelo
  • 0 in reply to Angelo Zhang87
    Prodigy 40 points

    Hi Angelo,

    We understood your point now that we must look for multi-step combination for our purpose.

    can you suggest buck-boost components with 2A burst which can go with BQ25606 or another best of your knowledge.

    Thanks & Regards,

    Arati

  • 0 in reply to Arati Paghadal
    TI__Genius 11850 points
    Hi Arati,

    The TPS63027 looks like it may meet your requirements. However, I only support battery chargers, so please create a new thread for the TPS63027 so someone from the appropriate team within TI can confirm this or give other suggestions.

    Best regards,
    Angelo