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  • TI Thinks Resolved

BQ27441-G1: pls help recommend a power solution..

Part Number: BQ27441-G1

we are designing a system with an battery and dc power supply, the dc-power in is 5V, battery is one cell need charge.  the power rail on board is 3.3v@850mA,  5v@2A, 1.8V@50mA;

if DC-IN exist, the power should come from DC-IN, after remove DC-IN, the power is from battery. could you help recommend a solution?

  • Genius 14785 points
    Hi!
    It sounds like you want a power solution to use the 5V DC input OR the 3V-4.2V battery. The simplest solution is to use a diode, but I think you are also missing a charger for your battery in your block diagram. Usually the charger can take the 5V input, pass it to the system while charging the battery, but when the 5V input is not present then it will provide the battery voltage to the system instead. I've re-assigned this to the charger forum for their suggestion. What is the capacity of your battery and what charging current and voltage do you require?
  • In reply to dMax:

    battery capacity is10000mah,charge current is1A  or 2A, charge voltage 4.2v.not only need the charge IC,Ialso need the boost dc-dc.

  • In reply to user1249266:

    any updated to this
  • In reply to user1249266:

    Hello,

    We have chargers that can buck DCDC charge and boost DCDC back to the input. However, for boost mode during battery only you will need to wait 30ms to boost back power.

    If this is ok for you, I would recommend using either the BQ25895. This will help incorporate the boost converter and the buck charger into a single IC.

    If you only need a charger, and still want the boost to provide continuous power, then I would look at either the BQ25600 or BQ25601 (either CSP or QFN package), or the BQ25606 which is a standalone device.


    Regards,
    Joel H
  • In reply to Joel Hernandez II:

    the charger ic is better has power path management,i will use a boost after the charger ic,  it should boost 3.7v to 5v  with output current 3A,do you have recommendation for boost ic?  

  • In reply to user1249266:

    could you pls help review this solution?

  • In reply to user1249266:

    Hi,
    The block diagram of Charger and Monitor looks good to me.

    Regards,

    Eric

    Texas Instruments

    Battery Charger Solutions

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