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DRV110: MAX IPEAK and IHOLD

lu tan
Prodigy 160 points
Part Number: DRV110
Other Parts Discussed in Thread: DRV8212, DRV8251

Hi,

I noticed in the datasheet that the max IPEAK mentioned was 900mA (Section 7.3.3). My application has a solenoid that draws 1.125A max. The DRV110 uses an external FET to pass the current, so I can choose a FET that can handle this current. However, can IPEAK go above 1.125A (say, 1.2A) and IHOLD go up to 1.125A?

Another thing, Page 6 of datasheet shows max IPEAK as 330mA and max IHOLD as 65mA. This contradicts with the 900mA above, for IPEAK at least.

Thank you in advance.

Best regards,

Lu Tan

  • 0
    TI__Guru 55565 points

    Hello,

    I have assigned this, but it is US holiday today.  Please expect a response on Monday.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    TI__Mastermind 37683 points

    Hi Lu Tan,

    The device can only regulate current up to 900mA, even if you include an external FET capable of going above 900mA, the driver will clamp the current at 900mA maximum. This is just how the device was designed.

    lu tan said:
    Another thing, Page 6 of datasheet shows max IPEAK as 330mA and max IHOLD as 65mA. This contradicts with the 900mA above, for IPEAK at least

    These are the default PEAK and HOLD currents when the PEAK and HOLD resistors are less than 43.33kΩ.

  • 0 in reply to Pablo Armet
    Prodigy 160 points

    Hi Pablo,

    I see. Thank you for the explanation.

    By chance, do you happen to know a chip either using internal or external MOSFET that can regulate up to 1.2A or beyond?

  • 0 in reply to lu tan
    TI__Mastermind 37683 points

    Unfortunately, this is the only driver capable of PEAK and HOLD current regulation. If you will keep the HOLD and PEAK currents at the same level, I recommend the DRV8212 or DRV8251 as a replacement.