TPS82150: Input leakage current into EN pin to high

Peter Forrer

Prodigy 20 points

Part Number: TPS82150

Tool/software:

Why is the input leakage current on EN as high? We expected 10nA @25°C/12V in.

V_EN vs uA_EN:

9 months ago

0 Colin Chen 9 months ago

TI__Mastermind 21361 points

Hi Peter,

Our spec can be guaranteed by EC table. I guess the difference is caused by test methods.

Thanks,

Colin

0 Peter Forrer 9 months ago in reply to Colin Chen

Prodigy 20 points

Hit Colin
Thanks for your answer. Can you explain the test methods?
I placed a 4k7 Ohm resistor to the EN-Pin and powered the pin with different voltages. The voltage over the 4k7 resistor gave me the information about the current.

Peter

0 Peter Forrer 9 months ago in reply to Peter Forrer

Prodigy 20 points

our schematic (EN w/o resistor to GND):

0 Colin Chen 9 months ago in reply to Peter Forrer

TI__Mastermind 21361 points

HI Peter,

Our spec is tested by ATE which device is working in test mode.

Thanks,

Colin

0 Peter Forrer 9 months ago in reply to Colin Chen

Prodigy 20 points

Thanks Colin for your answer.

Do you have an idea, why I measure on two device these high leakage current? For me is it not possible to change to test mode. And in our application, we don't need the test mode. We use the normal function mode.

It would be helpful to understand these situation. Is it normal, to have more then 3uA@2.5V at EN-Pin.

BR, Peter

0 Colin Chen 9 months ago in reply to Peter Forrer

TI__Mastermind 21361 points

Hi Peter,

You can chang the R113 to 100k and test again.

I think such current would reduce with resistor increase.

Thanks,

Colin

0 Peter Forrer 8 months ago in reply to Colin Chen

Prodigy 20 points

Hi Colin,

Thanks for your help. I've had the chance to measure it in more detail now. I initially used a 1 MOhm measurement, and when I switched to a better one, the results improved significantly.

The component under Test is part of a circuit with other components that affect the measurements. It seems like there's a high leakage current when the voltage is below 0.7V. However, we've found a solution, so it's no longer an issue for us.

Thanks, Peter

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TPS82150: Input leakage current into EN pin to high