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Battery charge management

user6533748
Intellectual 300 points
Other Parts Discussed in Thread: TIDA-050047, BQ25792, BQ25616, BQ25611D, BQ25883, BQ25306, BQ25611DEVM

Our company is designing a circuit that can charge more than one batteries. Do you have the PMIC to recommend and the circuit design to refer?

The output port is expected to use type-C, PMIC can realize the charge management of each battery, including the charge state indication

Please recommend the available chip and reference circuit, thank you!

  • 0
    TI__Mastermind 40305 points

    Hello,

    Please see the attached reference design, using a TI USB-PD Controller and a 2- to 4-Cell 5A TI Battery Charger. The battery charger has an ADC that includes Battery Current and Battery Voltage measurement.

    https://www.ti.com/tool/TIDA-050047

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0 in reply to Michael Emanuel35
    Intellectual 300 points

    Dear Mike Emanuel:

       Thank you for your reply!

    Tida-050047 supports 2-4 cell batteries, right? Is there a charging management IC that can support two independent batteries (one cell) charging?

    We expect to use 12V 2A AC adapter for power supply, with 1600mAh battery and 1.4A maximum charging current. We want to find a battery charging scheme that can support two independent battery charging. Do you have a suitable PMIC to recommend?

    Thank you! Looking forward to your reply!

  • 0 in reply to user6533748
    TI__Mastermind 20570 points

    Hello,

    How many sells in series is your battery configuration? This is mainly related to the charge voltage for the charger selection. 

    If you wish to charge two independent battery packs, then you will need two charger ICs with two independent charging circuit. We do not have a single IC solution to charge two independent battery packs.

    What is your end equipment? 

  • 0 in reply to Jing Zou
    Intellectual 300 points

    Dear Jing:

       Thank you for your reply!

       We want to develop a charging base, which can charge two devices at the same time.

       In addition, I would like to ask if there is a 5V 2A charging management IC that can be recommended? The IC can support USB power supply, detect the battery temperature, and independently program the charging parameters (charging and discharging current limit, charging and discharging end voltage, charging and discharging time, etc.). Can you provide a reference circuit to me?

       Thank you!

      Ellie

  • 0 in reply to Jing Zou
    Intellectual 300 points

    Dear Jing:

       Thank you for your reply！

        I want to ask for advice of the definition of battery fast charging

        Bq25792 supports PD fast charging, which is regulated by USB PD protocol. Will our chip manufacturers have their own definition? Does fast charging mean that the battery can be fully charged in a short time or the

    charging current must reach a large value in a short time? Is there a unified standard in this industry？

       For example,a battery with a very small capacity can be charged with a current of ?00mA, and it may be fully charged soon. Is this fast charging?

     It may take a long time for a battery with large capacity to be fully charged with ?A current. Is this not fast charging?

      I'm confused，I'm looking forward to your reply

      Tank you very much!

      ellie

  • 0 in reply to user6533748
    Intellectual 300 points

    Dear Jing:

        Sorry to disturb you again！

        I want to find a PMIC with battery management function with input voltage of 5V ~ 12V and charging current of 1.5A ~ 2A. Which products can you help me recommend. Can you help me to compile a list of

    recommended products, including product performance and price,Thank you very much!

       PMIC needs to output system voltage (sys), has the protection function of battery over voltage, over current and over temperature, and the charging parameters can be adjusted

    Thank you!  Looking forward to your reply!

  • 0 in reply to user6533748
    TI__Mastermind 20570 points

    Hello Ellie,

    Regarding on 5V/2A charger, we have a lot of options in charging 1S battery. You can have a look at BQ25611D or BQ25616.

    For 2s battery, you can take a look at BQ25883 boost charger or BQ25306 buck charger.

    If you are looking at >2S, then I would recommend BQ25792 for buck-boost operation supporting full PD range. 

    To answer your question on fast charging, there is no standard on this. The charging current is based on the battery specification. You might need to refer to your battery spec. 

    You can refer to the 1Ku price on our website. 

  • 0 in reply to Jing Zou
    Intellectual 300 points

    Dear Jing:

        Is there a reference circuit for bq25611d or bq25616? Our input power supply is type-C VBUS, the battery is 1Cell, the maximum charging current of the battery is 1.4A, and the battery has a temperature detection pin. The power supply that needs to be converted through BMS is 3.3V and 1.8V

    Does bq25611d or bq25616 need MCU control? If MCU control is needed, does the driver software need to be connected with MCU? If not, can bq25611d or bq25616 work independently after VBUS is powered on?Is the charging current programmable？

       Now we use bq25792 to develop a demo board. Now bq25792 doesn't work after VBUS is powered on, and Vsys = Vbat after battery is connected, but pins such as REGN have no voltage output, and they are all low level. The current value of VBUS is very small, only 22.8mA. The attachment is some waveforms we measured, please help us to analyze, thank you!8814.BQ25792 Waveform_20210125A.xlsxBQ25792.pdf

  • 0 in reply to user6533748
    TI__Mastermind 20570 points

    Hello Ellie,

    You can refer to the BQ25611DEVM and BQ25616 EVM user guide for the EVM schematic as reference. You will need external DC/DC or LDO for the 3.3V and 1.8V rail.

    Yes, both device need MCU to control. MCU need to write to the BQ25611D or BQ25616D register when the device is either powered up by VBUS or VBAT.

    Charging current is programmable through I2C. You can refer to the register map in the datasheet.

    Please start a separate post if you have specific questions on BQ25792. Thanks.

  • 0 in reply to Jing Zou
    Intellectual 300 points

    Dear Jing:

        Bq25611d can be charged with a programmable voltage range of 3.49v ~ 4.51v. How to understand this?

    In my opinion, 2 < Vbat < 3V of the charging curve is pre charging, Vbat > 3V is constant current charging, and 3.49v < Vbat < 4.51v can be programmed to

    make the charging current > 1.02A? Can the limit of 3V be modified by programming? Can the voltage and current limits of the battery at each charging stage

    not be set independently?

       Thank you very much！

       ellie

  • 0 in reply to user6533748
    TI__Genius 10240 points

    Hi Ellie,

    The programmable voltage range is referring to the fully charged battery voltage, which can be programmed by the register setting.  

    Please refer to the datasheet Figure 9-4, VBATLOWV is the threshold for pre-charge and fast charge. The pre-charge current is set by REG03 and the fast charge current is set by REG02.