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TPS22959: Application question consultation

Adrian Liu
Intellectual 2650 points
Part Number: TPS22959


Hi Team,

Customer is currently using TPS22959DNYR, the recommended ratio of CIN and CL is 10:1 in the datasheet. And they have some application questions as follows:
1. The customer wants to use this device in a hot-swap scenario. Can we support this scenario?
2. CIN cannot be larger than CL because the current backflow is acceptable. Will it damage the device or cause other abnormalities in the device?
3. The customer‘s schematic circuit is as follows. Please help review it.

BR

Adrian

  • 0
    TI__Mastermind 31440 points

    Hi Adrian,

    1. Yes, we can support this with TPS22959. However, I recommend using 1 or 2 (if all 15A are needed) TPS22997/8 devices, they are newer and have a wider feature set/protection mechanisms.

    2. Will VIN be floating when the customer is expecting current backflow? If so, it will be fine. If VIN will be forced to GND, it will also likely be fine as long as Tamb and the junction temperature aren't already approaching the device limits. The 10:1 ratio is primarily recommended to reduce voltage droop during quick high-current startups, and the 1:1 ratio is recommend to prevent backflow.

    3. Schematic looks fine as long as backflow isn't an issue, see (2).

    Thanks,

    Patrick