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TPS65094: About transient rating

Satoshi
Guru 19645 points
Part Number: TPS65094

About TPS65094, datasheet P10 is described SW and LX maximum rating below.

・LX：-2V_min (<20ns)

・SW：-5V_min(<5ns)

 Is there relation of Min voltage and Transient time?

Customer want to check OK or NG in the condition of SW：-1.4V_min(10ns).

Best regards,

Satoshi

  • 0
    TI__Genius 9655 points
    Satoshi-san,
    Thanks a lot for verifying this. The term "transient" in this context does not refer to a load- or line-transient or switching slope, but means that this condition is only supported for a brief moment of a few nanoseconds. E.g. the switch-node will briefly see a negative voltage any time the HS-FET turns off, because the body-diode of the LS will be conducting. SW will temporarily show about one diode-forward-voltage-drop until the LS-FET is turned on (with the voltage ratings of this part, it may be two FETs/Body-diodes in series). This is normal (and unavoidable) behavior. However, the body-diode is not suited for permanent current conduction, thus it must not be exposed to a permanent (or longer term) negative voltage of this amplitude. Higher (i.e. more negative voltages), even for very short term, may damage the ESD-structures and must be avoided.
    You'll notice that the -1V-rating in recommended ratings for these pins does not have the footnote about the timing-limitation, hence this voltage may be applied permanently without damage.
    Best regards,
    Frank