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MSui.1
MSui.1
Associate
May 22, 2020
Solved

The leakage current of L6470H's ADCIN pin

  • May 22, 2020
  • 3 replies
  • 1180 views

Please see the attached picture. Our company is using L6470H chip for our design. According to the typical application in the datasheet, we want get 3V on the ADCIN pin. Our Vs is 24V and the voltage divider resistors that we chose are Ra= 13K and Rb= 91K. Since we didn't find the leakage current of L6470H's ADCIN pin through datasheet, we don't know whether these resistors' value that we chose are too large. Could you please tell me the leakage current of L6470H's ADCIN pin and help us to see whether we chose the appropriate values for these resistors?

Thank you so much!

This topic has been closed for replies.
Best answer by Dario CUCCHI

Hi @MSui.1​ ,

I’m sorry for this late reply and I hope it can be still useful.

The ADCIN pin is a high impedance pin, so its leakage current is less than 1nA.

You can definitely use that resistor values for your application  (Ra= 13K and Rb= 91K) without any issue.

3 replies

Dario CUCCHI
Dario CUCCHIBest answer
ST Employee
July 28, 2020

Hi @MSui.1​ ,

I’m sorry for this late reply and I hope it can be still useful.

The ADCIN pin is a high impedance pin, so its leakage current is less than 1nA.

You can definitely use that resistor values for your application  (Ra= 13K and Rb= 91K) without any issue.

MSui.1
MSui.1Author
Associate
July 28, 2020

Thank you so much for the reply! It's still useful.

Dario CUCCHI
Dario CUCCHI
ST Employee
July 31, 2020

Hi @MSui.1​ ,

I'm Glad this helped you.

Could you mark the reply as a "Best answer" ?

It will increase the post visibility and will help the other community members, who have a similar question, to quickly find an answer.

Thank you and have a great day !

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