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TPS22954: Error occurs at VIN = 0.9V in PSpice for TI

Yuichi Itoh
Prodigy 20 points
Part Number: TPS22954
Other Parts Discussed in Thread: TPS22953, TPS22934

When simulating TPS22954 with PSpice for TI, an error occurred at a VIN voltage of 0.9V and the simulation could not be performed. If I change TPS22954 to TPS22953 and run a similar simulation, it ends normally.
Is it possible to use TPS22954 under the condition of VIN 0.9V?

TPS22954_STARTUP-VINVDDP-error.pdf

  • 0
    TI__Mastermind 32650 points

    Hi Itoh-san,

    TPS22953 and TPS22954 are sister devices with slight differences in the features provided. Both should work at 0.9V VIN assuming sufficient VBIAS is present. Seeing as how TPS22953 was able to run under 0.9V, I believe there may be a PSPICE model error here. The team will look into this but both devices will work under 0.9V Vin.

    Please feel free to run your testing on an EVM to confirm.

  • +1 in reply to Shreyas Dmello
    Prodigy 20 points

    At TPS22953, VIN = 0.9V, the simulation ends normally. I want to use a discharge device, so I simulated it with TPS22954. It is said that it will work even with TPS22954 and VIN = 0.9V, so we will proceed with the design with TPS22934.
    It is said that there is a possibility of a PSPICE model error, but if the cause of the error is found, we would appreciate it if you could let us know.

  • +1 in reply to Yuichi Itoh
    TI__Mastermind 32650 points

    Hi Itoh-san,

    I would also recommend you to test your design on the EVM first. Could you also share your pspice project? I will run some tests on my end and after confirming the issue, I will send this to our modeling team. Unfortunately, the turnaround here is quite slow but on the silicon level, the only difference between TPS22953 and TPS22954 is the presence of the QOD. They are different versions of the same device.

  • 0 in reply to Shreyas Dmello
    Prodigy 20 points

    I've acknowledged.