• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 64 subscribers
  • Views 112 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25185: 1A output

oben enes sucu
Intellectual 285 points
Part Number: BQ25185

Tool/software:

Hi,

I confused about output amper.

I got 18650 4.2Vmax battery, for 1A Output what should I put the ILIM/VSET and ISET resistors?

  • +1
    TI__Intellectual 2900 points

    Hello,

    Here are the recommended resistor values based on your requirements:

    ILIM/VSET resistor: 13 kΩ

    Refer to Table 8-1 in section 8.3.6 "ILIM/VSET Control" of the BQ25185 datasheet. For VBATREG = 4.2 V and ILIM = 1.1 A, the ILIM/VSET resistor should be 13 kΩ.

    ISET resistor: 301 Ω

    Refer to section 8.1.1.4 "ISET Pin Detection" of the BQ25185 datasheet. For a 1A fast charge current, the ISET resistor is calculated to be 300 Ω (with 301Ω being the closest standard E96 value).

    RISET = (KISET) / (ICHG) = (300 AΩ) / (1 A) = 300 Ω

    Please note that KISET, typically 300 AΩ, is a gain factor found in the electrical specification section of the datasheet.

    I highly recommend using the E96 series (±1% tolerance) of resistors to minimize charge current error.

    Best regards,

    Alec Lehman

  • 0 in reply to Alec Lehman
    Intellectual 285 points

    Hello Dear Alec,

    My final schematic is atteched;

     

    Is it legal to use /CE like that way? and any advice or something wrong in my schematic?

    Best Regards

  • +1 in reply to oben enes sucu
    TI__Intellectual 2900 points

    Hello,

    The only issue I see with your schematic is that /CE is always pulled up, which means that charge will always be disabled. I recommend connecting /CE to ground if you intend to always have charge enabled.

    Best regards,

    Alec Lehman