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BQ24171: request schematic review

TS Yang
Genius 4800 points
Part Number: BQ24171

BQ24171_SCH_Rev01.pdfHi,

Could you review above schematic, and please let me know whether there's any potential problem?

thanks,

TS

  • 0
    TI__Expert 8690 points
    Hi TS,

    A few questions to understand the application:
    1. What input voltage will be used? Is OVP not required (input FET is not blocking input adapter OVP)? What is the current limit for the input?
    2. Which battery will be used? How much charge voltage is required? How much charge current is needed?
    3. What thermistor is being used? Make sure TS resistors are calculated properly.

    For curiosity, what end equipment will use this charger?

    Regards,
    Steven
  • 0 in reply to Steven Bangdiwala
    Genius 4800 points

    Hi steven,

    thanks for your input.

    1. What input voltage will be used? Is OVP not required (input FET is not blocking input adapter OVP)? What is the current limit for the input?

    -> The input is connected to the adapter (5.0V/4A) through the eFUSE and into the Charger IC.
    OVP is required. The OVP design is based on the "Typical Application Schematic with Single-Cell Unremovable Battery" in Datasheet.

    -> The input current limit is not limited because there is no Rac Sensor resistance.


    2. Which battery will be used? How much charge voltage is required? How much charge current is needed?

    -> Battery is Max 4.2V CELL (see the attached file PM550-MZ952LI 规格 書 _A1_180117 (1) .pdf  )
    Charge Current is 1.5A.

    PM550-MZ952LI 格 _A1_180117(1).pdf
    3. What thermistor is being used? Make sure TS resistors are calculated properly.

    -> see the attached datasheet below.

    ECTH100505 103F 3830FST_AP(160819).pdf

    For curiosity, what end equipment will use this charger?

    -> End equipment is "Industrial PDA" and this charger will be applied in cradle.

    I'll waiting your additional comments for this schematic.

    thanks,

    TS

  • 0 in reply to TS Yang
    TI__Expert 8690 points
    Hi TS,

    Looks good, what I would suggest is add an input RC snubber to control hot plug overshoot (R4, R5 and C3 of EVM). Also, R124 is not necessary.

    As for the TS network, if 0C for cold and 60C for hot, 1.91kohm on R33 and 5.49kohm on R144.

    Regards,
    Steven