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Leakage Current TPS22860

Tom De Ryck
Prodigy 20 points
Other Parts Discussed in Thread: TPS22860

Dear,

TPS22860 is described as an ultra-low leakage load switch. Looking at the electrical characteristics in the datasheet this seems to be true. I however don't really understand how to interpret some of the figures given in the datasheet.

Figure 4. Here you see 3 graphs (Vout(on), Vin(off) and Vin(on)). Is Vout(on) the leakage current of the switch (leakage between Vin and Vout when switch is on)? And what is Vin(on) and Vin(off)? Is this the leakage current at the Vin-pin? Or is it the leakage of the Vbias-pin?

Figure 5. What is VIN(PWRoff) and VOUT(PWRoff)? What does the PWRoff mean? Here the leakage can go above 2uA but what is the condition?

Figure 7. What is exactly the power supply current? Is it the current in the VIN-pin or Vbias-pin? Or both?

Thanks for your help.

Tom.

 

  • 0
    TI__Genius 9860 points
    Hi Tom, thanks for the question. I will have an answer for you by tomorrow.
  • 0
    TI__Genius 9860 points
    Hi Tom, thanks for bringing this up. I apologize for the late reply.

    Vout (on) = leakage into VOUT pin whenever the device and switch path are both on. Tested at VOUT = 1V and VOUT = 4.5 V while VIN remains open.
    Vin(off) = leakage into the VIN pin whenever the device and switch path are both on. Tested at VIN swept from 0 V to VBIAS (5.5 V) while VOUT remains open.
    Vin(off) = leakage into the VIN pin whenever the device is on, but the switch path is off. Tested with a 3.5 V drop across VIN/VOUT both ways.

    VIN (PWROFF) and VOUT (PWROFF) are leakage currents when the device is powered off (VBIAS = 0V). Each pin is swept from 0 to 5.5 V for the test.

    Power supply current refers to the current flowing into VBIAS only.
  • 0 in reply to C. Ryan Land
    Prodigy 20 points

    Hi,

    thanks for the reply. 

    I'm assuming that the first "Vin(off)" in your reply should be "Vin(on)"?

    Based on your explanation about Vin(PWRoff) and Vout(PWRoff) I'm assuming that there is an error in Figure 5. It should be "Vbias = 0V" instead of (Vbias = 5V)".
    When updating the datasheet, you can also update the typo on page 7 (8.1 Overview). It should be "bi-directional" :-)

    Thanks.

    Tom.