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Can a Li-Ion charger IC (bq24090) be used to charge Li-Poly cells?

Derek
Mastermind 9802 points
Other Parts Discussed in Thread: BQ24090

Hello,

   I need a simple charge circuit to charge a one cell 200mAh Li-Poly battery from USB. Based on my research the algorithm for charging Li-Poly cells is the same as that of for Li-Ion cells. But some of TI's charger ICs are labeled for "Li-Poly" and some aren't. So can I use a Li-Ion charger IC like bq24090 for charging Li-Poly cells?

If not, then does anyone have a recommendation for a good Li-Poly charger IC? Microchip makes a cool one: MCP73831/2.

Thanks,

Derek

  • 0
    TI__Mastermind 36110 points

    www.batteryuniversity.com has some good resources to help you understand the differences between different batteries.  You can charge a Li-Poly battery with a Li-ion charger.  The battery charge profiles are identical.  The disclaimer her is that each user must understand their battery charging requirements and choose a charger that meets those requirements.  It's always possible that a battery vendor can make a battery that, based on the name, sounds like a standard battery type but has significantly different charging requirements.

  • 0 in reply to Matthew Day
    Mastermind 9802 points

    Thanks. I'll be using fairly common Li-Poly batteries from Renata, like this one:

    http://www.renata.com/cms/fileadmin/downloads/productsheets/lithium_polymer/ICP501230PS-02_111216.pdf

    BTW, how do I set the bq24090's pre-charge threshold? I don't see any mention of it in any battery datasheet.

    Thanks,

    Derek

  • 0 in reply to Derek
    TI__Mastermind 36110 points

    The bq24090 datasheet precharge to fast charge voltage level is fixed.  This is typically 2.5V.  The PRETERM resistor sets the precharge current.  The datasheet gives all the details.  You should be find using a precharge current that is 10% of the fast charge current. Many chargers have these ratios hard wired into the IC.