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Technical Support and Design Advice...

ssilberhorn

If you have technical questions or need design advice please post here or visit the TI E2E Support Community

 

Dear Group Members please feel free to help each other and offer advice.  We encourage you to work together to design the most innovative and creative projects.

 

Regards,

Shawn

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  • in reply to ssilberhorn

    Hello Shawn,

    I've been trying to design a setup last evening, and I encounter the following issue; I'd like to make the charger very small, and I don't see a solution by TI. The BQ2002 or the BQ22440 are both solutions for NiMH charging (and TSSOP8 for BQ22440 is acceptable), but as far as I can detect both these solutions are meant to be the controller of a buck converter topology. What I need for my application is a boost converter with fixed current limit for charging (5V in, 6-9V out @500mA). Of course I can build a current controlled boost converter, but then I would ruin my cells when they're fully charged, I'd like to have proper detection of the end of a charge.

    The LTC4010 kind of seems to do what I need, but I guess you'd be more happy with a TI solution.

     

    Any suggestions would be welcome.

  • in reply to vsluiter

    Hi Victor... feedback from our Engineer is "Either you can make a constant current boost and detect the end of charge by monitoring the temperature. Or you can use a boost to raise the voltage and then use a linear NIMH charger (like the BQ2002)."