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TLV61220: TLV61220EVM-120: Quiescent current is Larger than the rated parameters

? ?
Prodigy 10 points
Part Number: TLV61220

Tool/software:

Hi Ti

When I was designing the TLV61220, I found that the quiescent current at the input end of the chip is too large, when Vin=1.2V, Vout Noload, the input current is about 25uA when tested with Powermonitor.

At the same time, I also applied for the TLV61220EVM-120 comparison test, VIN=1.2V, Vout Noload, the quiescent current of the EVM tested with Powermonitor is also 29uA, but the theoretical current described in the specification is only 5uA, I want to ask what is the reason for this?

The figure below shows the TLV61220EVM-120 quiescent current test data

The figure below shows the parameters that are submitted in the datasheet

  • 0
    TI__Expert 7795 points

    Hi 

    How did you test the IQ? The test condition should be : EN high, Vout should be force to high than target voltage( using a source meter), to make sure that the mosfets don't switch, then you can read the current from vout and vin. That's the quiescent current .

  • 0 in reply to Nini Zhong
    Prodigy 10 points

    Hi 

    I use a power monitor as a power source meter, the device can provide a stable DC power output, and at the same time can display the output current, and the current detection accuracy can reach 0.1uA. I set the power monitor to 1.2V output, connected to the VIN and GND ends of the EVK, the EN and ON of the EVM are shorted, and at the same time use the voltmeter to confirm that the output of the EVM is 3.3V, and the EVM output is not connected to any load, and finally observe that the current on the power monitor is 29uA, that is, the EVM input has 29uA current.

  • 0 in reply to ? ?
    TI__Expert 7795 points

    Hi 

    could you test the SW waveform, if you see there is switching waveform, it is not the IQ. You should connect Vout to like 3.6V Source meter to test the IQ from the output pin.