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LiPoly protection circuit

Discussion in 'Electronic Basics' started by Daniel Kelly \(AKA Jack\), May 28, 2004.

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  1. Hi,

    I need a protection circuit for my lithium polymer battery. All the circuit
    needs to do is prevent the cell voltage from going below 3v. If the voltage
    goes below 3v then the battery must be disconnected to prevent damage caused
    by deep-discharge.

    Some suppliers (e.g. TI) sell single chips that do this. Does anyone know
    how I can get my hands on such a system here in the UK?

    Or any good schematics for a DIY circuit? I could try hacking something
    together myself but I'd feel safer with a tried-and-tested system.

    Thanks
    Jack.
     
  2. Well, TI of cause has distributors in UK so all parts are accesible there.
    Many of them are catalogue parts, so you could purchase them directly
    from any electronic parst supplier.
    Specifically for TI in UK see:
    http://www.ti.com/europe/docs/sites/uk.htm
    All TI parts come with reference design schematics and documentation. See
    power.ti.com, particularly
    http://focus.ti.com/docs/search/par...param_table&templateId=2&showAssociated=false

    Regards,
    Evgenij


    --

    __________________________________________________
    *science&fiction*free programs*fine art*phylosophy:
    http://sudy_zhenja.tripod.com
    ----------remove hate_spam to answer--------------
     
  3. Hi Evgenij,

    Many thanks for your reply.

    Yes, I have been looking through TI's UK suppliers. But, so far, none are
    willing to sell me any less than 120 parts. I only need 2! I'll keep
    looking.

    Thanks,
    Jack
     
  4. Ian Stirling

    Ian Stirling Guest

    I'd suggest paralleling the two cells, then looking round
    http://www.maxim-ic.com/ for a suitable step-up SMPS chip to use, with
    low battery shutoff.
    Set it to 3V, and you'r done.
    o
    Maxim will supply samples easily if you fill in the requisite form
    on their site.
     
  5. Great, thanks.

    I am ordering from Maxim right now!

    Thanks,
    Jack
     
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