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Original question:

TPS7A66-Q1: IQ information with Vin supplied 4V

TPS7A66-Q1: Input impedance at VIN pin

ABHISHEK B
Prodigy 70 points
Part Number: TPS7A66-Q1
Other Parts Discussed in Thread: TPS7A02

Hello , 

Can you please tell me the input impedance at VIN pin?

I am connecting VIN pin to battery via a diode and my customer has requirement of high resistance between  battery and GND( in the range of 100 Mohms).

So I would like to know how much impedance is there at VIN pin?

Thanks,

Abhishek B

  • 0
    TI__Mastermind 32955 points

    Hi Abhishek,

    If you take the quiescent current and use that with your input voltage, you can determine the effective impedance.
    If Vin = 10V and we approximate the quiescent current as 8uA at room temperature, then the effective impedance would be 10V / 8uA = 1.25 megaohms.

    This increases to 5 megaohms when the device is in shutdown mode.

    If this is insufficient you may want to consider the TPS7A02 which has much lower quiescent current values.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    Prodigy 70 points

    Thank you Stephen for your prompt response.