TPS22995: Estimation of max current on the load current which doesn't have current limit

Hideki Hayashi1

Expert 7420 points

Part Number: TPS22995

HI team,

TPS22995 is 3.8A load switch but it doesn't have current limit. Where does 3.8A come from?

Is it estimated as Rdson(max) * Iload * ΨJT < Thermal shutdown threshold?

Regards,

Hayashi

over 1 year ago

0 Patrick Shalton over 1 year ago

TI__Mastermind 21520 points

Hi Hayashi-san,

The TPS22995 data sheet lists the Imax in Section 6.1, Absolute Maximum Ratings. Are you asking about the mechanism for this specific current limit/consequences of exceeding this current?

Thanks,

Patrick

+1 Elizabeth Higgins over 1 year ago

TI__Genius 15635 points

Hi Hayashi-san,

We specify the max current rating based on the max ambient temperature (125C) and the following equation:

(Tj-Ta)/RΘjA=I^2*Ron

This will allow the device to drive 3.8A without triggering the thermal shutdown temperature (170C typ).

Best Regards,

Elizabeth

0 Hideki Hayashi1 over 1 year ago in reply to Elizabeth Higgins

TI__Expert 7420 points

Hi Elizabeth,

Thanks! That is what I wanted to know. I forgot squared current. And I know the criterial of temperature is 125C with RΘjA.

Regards,

Hayashi

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TPS22995: Estimation of max current on the load current which doesn't have current limit