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TPS62136: ESD protection for each pin

Y.Ottey
Mastermind 6145 points
Part Number: TPS62136
Other Parts Discussed in Thread: TVS1400, TPD2E007

Our customers are considering placing Zener diodes and resistors for the purpose of ESD protection for TPS621361. I would like you to answer the following questions.

1. Is there any operational problem with placing a Zener diode or TVS diode in the immediate vicinity of each pin, such as the VOS pin?

2. We are also considering inserting a resistor in the red circle in the circuit diagram below to protect the ESD of the VOS pin. Is there any operational problem if this method is used?

Best Regards,
Y.Ottey

  • 0
    TI__Expert 7500 points

    Hi Y.Ottey,

    The circuit diagram is failed to upload. Please re-upload.

    Amod will response to you soon.

    Thanks,

    Lishuang

  • 0 in reply to Lishuang Zhao
    Mastermind 6145 points

    Hi Lishuang

    Thank you for your reply.

    I re-uploaded the schematic.

    Regards,

    Y.Ottey

  • 0
    TI__Mastermind 25290 points

    Y.Ottey,

    A resistor between VOS and Vout is not recommended as it can interfere with the internal control loop and also may cause regulation issues. For detailed help on ESD protection, I am forwarding these questions to the right team.

    Thanks,

    Amod

  • 0 in reply to Amod Vaze
    Mastermind 6145 points

    Hi Amod,

    Thank you for your reply.

    The number one question I sent in my first post was answered as follows:
    ”For detailed help on ESD protection, I am forwarding these questions to the right team."

    As mentioned above, is it okay to recognize that the ESD protection IC team has confirmed this?
    I have received a request from our customers for an early response.
    Therefore, I would be grateful if you could get a reply as soon as possible.

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Mastermind 25290 points

    Y.Ottey,

    Yes this post has been redirected to the right team and will respond to it.

    Thanks,

    Amod

  • 0 in reply to Y.Ottey
    TI__Expert 8486 points

    Hello Y.Ottey,

    I'm happy the help answer your questions.

    1. When you connect an ESD protection IC on a pin, there are two parameters you should consider: input capacitance and leakage current. Since this is for power and not a high speed data line, capacitance shouldn't matter too much to you. However, leakage current might affect your use case. Most of our devices only have a few nanoamps of leakage, but it's still something to take into consideration. Here's an article explaining the two mode of a protection diode. 
    2. We don't recommend coupling our devices with resistors. If you need more protection, I would recommend picking a device with a lower clamping voltage. 

    For the output pins, I would consider using the TVS1400 or TPD2E007 since the output voltage max is 12 V. 

    Please let me know if you need any clarification on this or have any more questions.

    Regards,

    Matt Smith