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DRV5011: How to understand the ICC current of DRV5011

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Part Number: DRV5011

Hi Team,

There is a product requirement as follows:

  • Closed product structure, powered by coin-cell battery
  • Long-term storage (more than 1 year) after production is completed
  • When it is needed, it needs to be activated with an external magnetic field

Customer considers using DRV5011 or similar latching Hall sensors. Its output opens and closes the power supply of the entire circuit. Because the lowest current consumption is required during storage.

The customer found that the ICC current of the DRV5011 is about 2.3mA and the coin cell battery capacity is about 100mAh, which obviously consumes too much. He saw the ICC current of the DRV5032 at the microampere level. He does not understand the ICC parameters.

Question:

  1. How to understand the ICC current of DRV5011? Is it a quiescent current without applying a magnetic field, or is the magnetic field exceeding the working current after BRP or BOP?
  2. If DRV5011 cannot meet this demand, would you recommend any other plan?

Best Regards,

Annie

  • Annie,

    The Icc of DRV5011 is in fact a quiescent current. This does not account for any loading off of the output of the device, which is usually minimal, and dictated by the amount of current and output voltage required by whatever the device is driving. 

    The reason for the difference in magnitude (2.3mA of DRV5011 vs. 1.8uA Icc(avg) of DRV5032) is that the DRV5032 is a duty cycled part, while the DRV5011 is a constant on part. The DRV5032 is duty cycled at the rate of 5Hz or 20Hz, dependent on device selection, and sees a massive reduction in power as a result of that. If you look at the DRV5032 datasheet, you will see there is also a Icc(peak) value, which is close to that of the DRV5011, but this current is only realized for a few microseconds, at the rate of the sampling frequency. The device remains off otherwise. Also note that the DRV5032 is a switch, not a latch, so if the customer wishes to use a latch here, this device will not work for their application.

    Given that your customer plans to utilize this as a power activation method, if they want to use a latch and maximize power savings, I would advise them to look at DRV5012, as this device is similar to the DRV5032 in that it is power cycled for savings. It is available in X2SON package, and is able to select between sampling frequencies of 20Hz and 2.5kHz. As this does not require a higher-speed frequency like encoding, I would think they could select 20Hz and reap the power savings the device provides. Please let me know if this makes sense. 

    Best Regards,

    Carolus Andrews, Analog Applications, Current and Hall Effect Sensors

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