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TPS22810: Safe Operating Area

Keith Keller
Expert 7250 points
Part Number: TPS22810

Hello,

We're interested in more details on the safe operating area of the TPS22810. 

I see that the bottom of page 12 states "The device has a thermal protection feature. Due to this device protects itself against thermal damage due to over-temperature and over-current conditions. Safe Operating Area (SoA) requirements are thus inherently met without any special design consideration by the board designer."

We’re specifically concerned about transient / inrush current:

  • Does the datasheet note cover transient/inrush or does it apply only to steady-state operation?
  • We measured a peak current transient at startup to be approximately 3.5A with 12Vin.
  • Do you think this transient will be within the safe boundaries of the part?

Thank you, Keith

  • 0
    TI__Mastermind 32650 points

    Hi Keith,

    The note covers startup and DC. If the device hits thermal shutdown during startup, it will turn off before the device gets damaged. While it seems that the 3.5A inrush is acceptable in your system, I would recommend adding a bit more CT capacitance to slow down the ramp rate of the device. Unless there is a strict timing requirement, the risk is reduced significantly with lower inrush with the DBV package as the device could start hitting TSD at higher ambient temperatures.

    Thanks,

    Shreyas