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LM2903-Q1: negative input voltage, max current

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Part Number: LM2903-Q1

Hi,

on the LM2903-Q1, there is no max input current specified. 

(the non-Q100 has a max of -50mA in the data sheet)

What is the max input current for negative input voltage? 

Thank you

Cristian

  • Christian

    It is unfortunate that the datasheets are not the same.  I believe you will find that it is more common to only have the min input voltage of -0,3V in the abs max table and no input current spec.  That is because it is not possible to have -50mA for input current and not violate the -0,3V input voltage.  Our team wrote an application note for this comparator family and section 2.9 addresses protecting the input against negative voltages www.ti.com/.../snoaa35.pdf.  I do not have enough characterization data to provide a max input current when the input reaches -0,3V but it will be less than 50mA since the diode does not start conducting hard until after -0.4V.  Figure 4 on page 7 shows a typical performance curve of input bias current vs input voltage.  We can discuss offline if you need us to provide more.

    Chuck

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