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TLV1805-Q1: Output voltage during shutdown

James Cho
Prodigy 30 points
Part Number: TLV1805-Q1

What does the output do when the shutdown input is active?  I see contradictory information in the datasheet and simulations.

Figure 2. Shutdown Timing - shows the output going high during shutdown and matches PSPICE simulation.

Section 7.3.4 Shutdown Function describes the output as high impedance during shutdown and requires a pull-up or pull-down to prevent floating states.

Please clarify.

Thanks.

  • +1
    TI__Guru 52196 points

    Hello James,

    During shutdown, the output goes high-Z (neither sinking or sourcing). Essentially "floating".

    However, the ESD protection diodes from the output to each rail are still present - so the output cannot be forced beyond the supplies.

    If you wish the output to go in a particular direction during shutdown, then a light pull-up or pull-down resistor would be needed.

  • 0 in reply to Paul Grohe
    Prodigy 30 points

    Thanks for the clarification Paul. 

    I'd like to suggest correcting the PSPICE model to act appropriately when shutdown is active as well as clarifying Figure 2 in the datasheet if possible.

    Thanks