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TPS53318: Replace TPS53318 with TPS53353/TPS53355

Ryotaro Fukui
Intellectual 2345 points
Part Number: TPS53318
Other Parts Discussed in Thread: TPS53353, TPS53355

Hello team,

I would like to confirm if TPS53353DQPR or TPS53355DQPR could be considered as an alternative for TPS53318DQPR.

From the datasheet, TPS53353 and TPS53355 seems to be pin compatible with TPS53318, while continuous output current and 5 pin termination seems to be different.

Could you check these questions below?;

  • Q1) 5 pin is N/C for TPS53353/TPS53355, and ROVP for TPS53318. Is it possible to replace TPS53318 with TPS53353/TPS53355 by simply removing the resistor or capacitor connected to the ROVP pin's circuit?
  • Q2) The continuous output current is 20/30A for TPS53353/TPS53355, and 8A for TPS53318. Is it possible to limit the output to a maximum of 8A by changing the resistance value of the TRIP pin?

We would also like to know it if there are any other concerns regarding replacement.

Best Regards,

Ryotaro Fukui

  • 0
    TI__Expert 5310 points

    Hi Ryotaro,

    AS you mentioned the TPS53318 utilizes the same package as the TPS53353/TPS53355 and the devices are pin-to-pin compatible. If using the TPS53353/TPS53355 to replace the TPS53318, there are a couple of precautions as you noted.

    To answer your questions:

    Q1)  Please leave pin 5 floating on the TPS53353/55, this can be accomplishes by removing any components of the ROVP pin's circuit utilized with the TPS53318.

    Q2) Yes, the value of the trip pin may be adjusted to lower the current limit to a maximum of 8A. This resistance value can be determined with equation 10 found in section 8 of the datasheet (pictured below)

    Please use 1.7mohm for the RDS(on) in this calculation and 10 uA for Itrip if designing the application for room temperature. IOCP can be set to 8A and the remainder will depend on the customer's application.

    Other than those precautions, the controllers for the TPS53353 and TPS53318 are very similar, and the necessary stability criterion for ripple injection are the same. In addition, the external components used for bypassing and setting operating values such as frequency and soft-start time are the same for all 3 of the devices mentioned in this thread. Please reach out with any further questions or if a schematic review is needed if the TPS53353/55 is used in place of the TPS53318.

    Regards,

    Alec Biesterfeld