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LM53635-Q1: RC circuit needed on Enable pin so that ESD cell is not activated or damaged

Jared Becker
Genius 11845 points
Part Number: LM53635-Q1
Other Parts Discussed in Thread: TPS61088-Q1

Hi Team,

When using the LM53635-Q1, should an RC filter be implemented between the driving source and the EN pin?

Some regulators require an RC circuit at the EN pin to slow down the voltage driving the enable pin because a high slew rate can activate the ESD cell on that pin and cause the regulator not to turn on. Additionally, without an RC filter at the EN pin, I have heard that the ESD structure can be damaged due to high current or false triggering may occur during surge testing.

Please let me know if this needs to be considered for this device.

Thank you!

Jared

  • 0
    TI__Expert 3835 points

    Hi Jared,

    It is not common to put an RC filter on our EN pins, but it would be fine if the customer wanted it implemented. Where is the enable signal coming from and what is the slew rate on it? Do you know TI devices that requires an RC circuit on the EN pin of buck converters? 

    Regards,

    Ethan

  • 0 in reply to Ethan T
    TI__Genius 11845 points

    Hi Ethan,

    Thanks for the insight! It is not preferable to add this RC circuit, so I am just checking to understand if it is recommended or necessary. Can you please confirm that it is not necessary?

    The enable signal is likely coming from an MCU GPIO and I do not know the slew rate. My goal is to understand if there is any slew rate limitation of the device.

    The TPS61088-Q1 is a boost converter and the applications team for that device does recommend an RC circuit on the EN pin so that the ESD structure does not get activated.

    Thank you,

    Jared

  • 0 in reply to Jared Becker
    TI__Expert 3835 points

    Hi Jared,

    Yes an RC circuit is not preferred on the EN signal. If it is coming from a GPIO I don't have a large concern for the slew rate or the drive strength to damage the device.

    Regards,

    Ethan