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DRV8838: 1.8V VDD power supply

John Liu59
Intellectual 2735 points
Part Number: DRV8838
Other Parts Discussed in Thread: DRV8833,

Dear all,

My customer use DRV8833 with Vcc 1.8V power supply since the control signal is from 1.8V platform, in our datasheet,  the maximum VCC rising threshold is 1.8V, they are concern if the VCC voltage is a little bit lower than 1.8V, DRV8838 will not work.

I want you help to evaluate the danger for this kind of application, do we have those kind of application make production before? Any ideas to solve this problem?

Thanks.

  • 0
    TI__Guru** 114905 points
    Hi John,

    Attempting to operate the DRV8838 with a VCC of 1.8V may not work. Any variation of the 1.8V supply could cause the device to remain in undervoltage lockout.

    Does the customer have a higher supply available on the board? If so, setting the DRV8838 VCC to a higher voltage would be recommended. The DRV8838 will respond to 1.8V signals as long as the logic high level at the pin is .5 X VCC.
  • 0 in reply to Rick Duncan
    TI__Intellectual 2735 points

    Hi Rick,

    If I choose 3.3V power supply for Vcc, and using 1.8V control signal to control, since 1.8V is higher than 0.5VCC, so it can work normally?

    Am I right?

    Thanks.

  • 0 in reply to John Liu59
    TI__Guru** 114905 points

    Hi John,

    Yes, the device can work normally as long as the control signals are higher than 1/2 VCC.

    Please note the variation of the 1.8V controller and the 3.3V supply could create conditions that may not work. If the 1.8 supply lowers to 1.75V and the 3.3V supply rises to 3.6V, the control signal is less than 1/2 VCC.