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DRV8870: What is the difference between these three chips of DRV8870/1/2?

Part Number: DRV8870
Other Parts Discussed in Thread: DRV8871, DRV8872

Hi TI

    What is the difference between these three chips of DRV8870/1/2?

    Is there a detailed comparison table to help me choose? The screening difference on the official website is not very clear.

     rain.wang@arrow.com  thanks.

  • Rain,

    The DRV8870 has current regulation using an EXTERNAL shunt resistor.  A VREF pin is provided to adjust the current regulation level.

    The DRV8871 has INTERNAL current sensing (no external shunt resistor required).  

    The DRV8872 is just like the DRV8870 except the VREF pin is replaced with a nFAULT pin for reporting faults.  VREF level is FIXED since the device no longer has a VREF pin.

    Regards,

    Ryan