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LM7322: LM7322 Equivalent circuit

Vidar Vidnes
Prodigy 10 points
Part Number: LM7322

Hi

I would like to have the equivalent circuit for LM7322 input/output, showing protection etc.

This is not part of datasheet as was normal in the early days. Where may I find this information.

Breg

Vidar

  • 0
    TI__Mastermind 30600 points
    Hi Vidar,

    I'm taking a look at this request, please give me a few days to get back to you.

    -Paul
  • 0 in reply to Paul Goedeke
    TI__Mastermind 30600 points
    Hi Vidar,

    The actual internal circuitry is proprietary information and we do not share this as a rule without NDA’s and VP management approval. In the past, equivalent schematics were provided because devices were simpler but with modern complex devices, we are no longer providing this information.

    Some general information on the internal details of this device:
    * This is a bipolar device 30V high speed inputs and outputs.
    * The input is a conventional dual stage PNP/NPN rail-to rail input.
    * They have conventional ESD “diode” structures from all pins to V+ and V-.
    * The outputs are “beefed-up” to allow driving high peak currents and internally compensated to drive high capacitive loads.

    Other considerations for this device:
    * The outputs can drive high peak currents but the packages are not sized to dissipate continuous current (especially the SOT-23!), so watch the package power dissipation! It is easy to violate the datasheet conditions with 12-24V supplies.
    * They do not like having the outputs jammed into the rails, and consume more supply current when jammed into the rail.
    * Do NOT use as a comparator!
    * Watch for oscillation if jammed into the rail.

    Thanks,
    Paul
  • 0 in reply to Paul Goedeke
    TI__Guru*** 146256 points

    Vidar,

    Here is some additional data. Input current while inputs are not close to each other will be higher than normal but internally limited to safe level.

    This chart shows input currents for VCC = 30V, IN+ at 15V with IN- swept from 0V to 30V.