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BQ24800: addressing 10x NiMH cell battery pack

Bart
Expert 6310 points
Part Number: BQ24800
Other Parts Discussed in Thread: BQ24450

Hello,

What's the best TI charger if we have 10x NiMH cells battery pack (cells are HHR-210AA/HT), and want slow (200 mA) and/or fast charging (1000 – 2000 mA)?

Input voltage is 24V typically (full range should be up to 60v, so would need to use step down for this for sure).

Thanks a lot.

 

  • 0
    TI__Expert 5330 points

    Hi Bart,

    Assuming 1.2V per cell, a charging voltage of 12V is achievable from many of our multicell chargers such as BQ24800 and BQ2571x.  However, neither of these devices can support a 60V input voltage.  Both devices have an absolute max input voltage of 30V with a recommended operating range up to 24V. 

    You might take a look at the BQ24450, which can operate up to 40V input, although this is targeted for Lead Acid batteries you could control the termination using an external uC that sets a timer and/or monitors battery temperature..  The CE (charge enable) pin could be used by the external uC to terminate charge.  You can set the charge current using IFB and external resistor.  If you want to have the ability to select between different values (i.e. 200 mA or 1000-2000 mA), you would need to use FETs controlled by uC to change the resistance of the IFB resistor.  Whereas in SMBus programmable devices such as BQ24800 and BQ24710, you could use SMBus to reprogram the charging current without external components. 

    Other than the BQ24450, the highest input voltage supported by our current product offering is 28V with the BQ2461x devices.  These are also standalone devices.

    Regards,

    Steve