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TPS54326

Vladimir Nohava
Prodigy 185 points

Hello,

In the DS,  the absolute maximum ratings states that SW1 &  SW2  are limited to -3V to 20V for 10nS.

In my case SW1 is -3.33V for about 1.63nS. Is this a problem for the switcher?

Load is very light so it is in auto skip eco mode. Inductor is 3.3uH (2.8A) with about 50uF load.

Vin =12.2V, Vout = 3.3V, feedback resistors are 20K and 6.04K.

  • 0
    TI__Guru**** 191445 points
    i would say the risk is extremely low. The -3V for 10 nsec specification is somewhat arbitrary. It is impossible to completely eliminate the negative undershoot in a real life circuit with parasitic inductances. Also, the amplitude and time duration are very dependent on measurement technique. It is best to use "tip and ring" from SW to a local GND right at the IC to eliminate any effects from the scope probe ground connection.