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5V Power switch, Response time to short circuit (tIOS) < 1usec (or shorter than TPS2556, TPS25200)

Naokazu Kinjoh
Intellectual 2740 points
Other Parts Discussed in Thread: TPS2556, TPS25200

Hi team,

Does TI have 5V current limit switch which Response time to short circuit (tIOS) is less than 1usec?
If [less than 1usec] is impossible, the customer wants to know the part which tIOS is less than typ 3.5usec which is of TPS2556, TPS25200, the customer is using now.

Condition :
* Response time to short circuit (tIOS) : < Typ 1usec ( or < 3.5usec )
* Current limit threshold : Min2A, Max2.5A
* Power switch ON resistance : Max 50mΩ ( Tj : -40C~125C )

Best regards,
Naokazu Kinjoh

  • 0
    TI__Mastermind 42795 points

    Hi Kinjoh-san,

    In my opinion, the switch my itself is not available to meet this req't. We need help from both IN (source) and OUT (load) capacitance as well as very low inductance layout practice. Nevertheless, I can ask the design team (out for US holiday) about it to get a better answer.

  • 0 in reply to Eric Wright
    TI__Guru* 95791 points
    Hi Kinjoh-san,

    We have TPS2592xx family of devices which can support "Response time to short circuit (tIOS)" less than 1usec

    Other features are
    Input voltage range 4.5V to 18V
    Response time to short circuit (tIOS) : < 1usec
    Current limit Max: 5A
    Power switch ON resistance : Typ 28mΩ (at Tj = 25C ), Max 48mΩ (at Tj = 125C )

    Please have a look at the datasheet and let me know if you need any information.

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    TI__Intellectual 2740 points

    Hi Rakesh,

    TPS2592xx seems to pulling current with VOUT being down to zero when in short-circuit.
    Does TI have 5V current limit switch which meets following condition and continously keeps VOUT and current when in short-circuit?


    Condition :
    * Response time to short circuit (tIOS) : < Typ 1usec ( or < 3.5usec )
    * Current limit threshold : Min2A, Max2.5A
    * Power switch ON resistance : Max 50mΩ ( Tj : -40C~125C )
    * Countinously keep VOUT and current when in short circuit

    Best regards,
    Naokazu Kinjoh

  • 0 in reply to Naokazu Kinjoh
    TI__Guru* 95791 points
    Hi Kinjoh-san,

    The output voltage depends on the impedance of the short. If it is a hot-short at the output, the output voltage falls close to zero.
    The device can maintain VOUT to an certain extent for overload condition.

    Thanks
    Rakesh