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TLV3402 / VICR exceeds the Rails

Other Parts Discussed in Thread: TLV3402

Hi,

TLV3402 has the future that can be achieved VICR exceeds the Rails. Then customer would like to know the simplified equivalent circuit of input.

Can we use the SIMPLIFIED SCHEMATIC like LMV710 as reference information?

I understand that the Vbias1/2 stated in it achieve VICR exceeds the Rails. Is my understanding correct?

http://www.ti.com/lit/ds/slos463a/slos463a.pdf

Best Regards,

  • Hello Sotashi-san,

    The TLV3402 input circuit is complex and uses two different bipolar differential input pairs. The first pair is effective with a CMV level of 0 V through most of the positive input CMV range. Then, as the positive CMV input level is increased this first differential pair begins to shut down and the other input pair becomes activate. This alternate input stage handles the input levels as the CMV approaches and exceeds the positive supply rail voltage, up to Vcc + 5 V. This design does not rely on any sort of voltage divider when this is accomplished. Also, the input ESD cells are designed to stay off with any of input voltage levels specified even when the positive supply rail voltage is exceeded.

    There isn't much similarity between the CMOS LMV710 and the bipolar input TLV3402 input circuits. You really wouldn't want to represent one design as the other.

    Regards, Thomas

    PA - Linear Applications Engineering