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LDC0851: Lowest power possible via PWM EN pin?

Cameron Wutzke
Expert 3592 points
Part Number: LDC0851

Tool/software:

Hey, I wanna check if my math is correct , and if I'm missing any current draw into the device. I'm hoping to calculate average power draw for our application 

If EN is high , (770uA active * EN) + (0.14ua shutdown * [1-EN])

looks like we have (this is the part I'm hoping for confirmation on )

  • 450us startup
  • 290us conversion
  • 580us output tdelay
  • 450us active -> shutdown transition

= 1770us

soooo theoretically: 1Hz polling could get us 0.00177s on , 0.99823s off  my napkin math looks like 1.36uA + ~0.14uA = ~1.5uA avg

2Hz pollingshould be about ~3uA avg

  • 0
    TI__Mastermind 26335 points

    Hello Cameron,

    The total current will depend on your sensor layout and operating frequency.  I think the current profile per the provided timing specifications will look something like this with illustrated transitions is not to scale.  However, I will check with our design team for confirmation.

    Otherwise, we do have power calculator for the device in our LDC calculator tool shown below. www.ti.com/.../LDC-DESIGN-TOOLS