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BQ25606: please Confirm this BQ25606 circuit

WOOYONG SUNG
Prodigy 235 points
Part Number: BQ25606

Hello sir.

I use BQ25606 chip, and so i need your help.

 my SPEC(5000mAh charging)

    1. if data cable ,  500mA charge

      if TA adaptor, 2A charge

      else    2A charge

    2. No OTG,No I2C

Please look at this circuit below and let me know if you can review it

  • 0
    TI__Mastermind 35955 points

    Hey Wooyong,

    VAC, VBUS – Make sure the 1 uF cap is placed as close to the IC.

    PMID – Capacitor correct.

    OTG – The OTG pin cannot be floating. If you do not want OTG, you need to pull OTG low.

    TS – Resistor Divider looks fine, along with thermistor.

    ILIM, ICHG – Resistors are fine, but maybe you want to use the max tolerance for KICHG and KILIM?

    BAT – Make sure the 10 uF cap is placed as close to the BAT pin.

    SYS – It is recommended to have 20uF of capacitance on SYS.

    REGN – Make sure the REGN cap is close to the IC.

    BTST – Capacitor correct.

    VSET – If you leave this floating the battery regulation voltage is 4.208 V. Is this what you want?

    SW – What is your input voltage? You can calculate your maximum inductor current ripple when you know this. The datasheet recommends this value be between 20% and 40% of the maximum charge current. Could you give me an estimated system load current so I can see if this will reach the saturation current of the inductor?

    I am confused about your specification for the current. Do you want change the charge current based upon different adapters or do you want to change the input current limit with different adapters?

    Our part is standalone and does not allow the charger to change charge current based upon different adapters. If you are referring to the input current limit, D+/D- detection will set the input current limit according to Tables 1 and 2 in 25606 datasheet on Page 17. Then, if none of these adapters are present, the ILIM pin, which you set to 2A, will limit the input current to 2 A.

    Please make sure your capacitors are rated for the required voltage.

    Sincerely,

    Michael E.

  • 0 in reply to Michael Emanuel35
    Prodigy 235 points

    Thank you for answer. Mr.Michael .

    I knew the meaning " stand alone"

    1) I modified it as you advise, review it[figure.1]

    2) i can use 5000mAh cell, when using TA Adaptor, Charging time seems to be within 4 o'cloc.k

        see page 17, 

        when you change to Ichg=1.5A instead of 2A, page 17 Table1  

        how does the current value of the divider 1,2,3,4 ?

    3) the user can use the cable(no d+,d- ,only 5V,GND)on the laptop, but this does not seem to de detectable, right ?

       so, what happens to the charge current when plugging a cable that does not have d+,d- to charge the cable to the notebook?

        

    4) so, i would like to apply the charge current to the following  types.

          -5V Adpator(DCP) ,   1.5A Charge

          - USB SDP       , 500mA Charge

          -  page 17 table 1

                                                [Figure.1]

  • 0 in reply to WOOYONG SUNG
    TI__Mastermind 35955 points
    Wooyong,

    Just to clarify, what do you mean by a TA adapter?

    (1) Schematic looks good. I did notice you changed your ILIM and ICHG resistors. Please note changing the ILIM resistor just changes the input current limit if an unknown adapter is detected. ICHG will set the charge current at a fixed value and will not change unless the input current limit clamps it.
    (2) Page 17 Table 1 refers to the non-standard adapter detection and what the input current limit, not the charge current, is set to after D+/D- detection is run. The dividers just refer to the internal resistor dividers in non-standard adapters.
    (3) If an unknown adapter is not detected, the ILIM pin will set the input current limit.
    (4) If you want to have different charge currents, you will need I2C and something that will switch between the different resistors needed. D+/D- detection will only change the input current limit.

    Sincerely,

    Michael E.
  • 0 in reply to Michael Emanuel35
    Prodigy 235 points

    Thank you for your reply, sir

    sorry,TA Adpater means  USB DCP

  • 0 in reply to Michael Emanuel35
    Prodigy 235 points

    Thank you, sir

    sorry, TA Apapter means USB DCP

    I looked more closely

    1.Vsys was not connected to SYS[SW] 

       Vsys = VCC_3V7

    2. about PG pin, MCU  GPIO is connected to PG pin

       if the MCU is not power good, will it stop charging ?  i do not think i need PG pin

       can not i floating ?

    3.about stat pin, 

       when charging is complete, how many voltage are on the stat pin ?

       i asked if i needed R

    4.I'm not using a thermistor. Can I remove the circuit on the ts pin side (R28, R34, R30)?

      else How should I put it?

    please also  review this circuit

    thank you,sir

     

                                   [Figure.1]

  • 0 in reply to Michael Emanuel35
    Prodigy 235 points

    I have additional questions.

    I have to ask about inductors in SYS.

    The current consumed in operation is MAX 300mA. I do not think I need high current inductor. What do you think?

  • 0 in reply to WOOYONG SUNG
    TI__Mastermind 35955 points
    Wooyong,

    The TA Adapter or the USB DCP will have an input current limit of 2.4 A.

    The device will stop charging if the power good is not low because the input source is a bad source. This pin is not an input. You can leave it floating, but if you do use it you need to pull it up.

    The STAT pin will be pulled up through to whatever pull up voltage you have for the STAT pin, for example like REGN.

    You can remove the thermistor but you still need a bias circuit to keep the voltage in the appropriate range. As long as you bias the TS pin to 50% of REGN (we recommend two 10Ks in series) the part will still charge.

    Also, for the schematic, PG and STAT need to be pulled up externally through a pull up resistor. They are open drain pins.

    Is the current consumed the current flowing through the inductor or just to the load? If going through the inductor, page 26 of the datasheet illustrates the selection of the inductor.

    -Michael E.