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TPS62135: 5V to SW pin

Zeming Kong
Expert 3515 points
Part Number: TPS62135


Hi team,

My customer is evaluating TPS62135, and in his application, there will be a 5V rail connected to SW pin, when VIN=0V.

According to datasheet, this is not allowed and will damage the IC.

Could you tell me how to protect the IC? Is a Schottky diode useful? Or should we limit the reverse current?

Best,

Zeming

  • 0
    TI__Mastermind 27260 points

    Hi Zeming,

    The 5V voltage itself looks fine as it is within the max voltage rating of the TPS62135. You do not need to protect the IC itself unless the reverse current exceeds current rating of the part or if is high enough to overheat the internal HSFET body diode which will be forward biased due to a higher voltage on SW compared to VIN. The output voltage minus this diode voltage drop will be present at the input and you need to ensure that this voltage does not cause issues for other connected circuitry. You can use a schottky diode at the input if you do not want any reverse current. You can check for details of this information in https://www.ti.com/lit/an/slyt689/slyt689.pdf 

    Thanks,

    Amod