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LM1117 / Definition of absolute maximum ratings

S.Satoshi
Guru 21685 points
Other Parts Discussed in Thread: LM1117

Hi All,

I'd like to ask about definition of absolute maximum ratings. Now I'm asking it for not only LM1117 but also all TI's devices.

[Question]

Is the maximum ratings of each voltage applied for only DC voltage? I mean that the AC voltage like voltage spike can not be greater than it?

Now I'd like to discuss about spike voltage like inserted waveform. Can this input  voltage not be accepted if the main DC voltage is 19V in this case though the maximum ratings of Vin is 20V?

Best Regards,

Sonoki / Japan disty

  • 0
    TI__Expert 3920 points

    Hi Sonoki,

    As stated in the LM1117 datasheet, the voltage between Vin and GND should not exceed 20V at any given point in time. Any sort of voltage spike that exceeds this limit may damage the device, even if the DC voltage is below the absolute maximum.

    With that said, I would not recommend operating the LM1117 with the voltage spikes shown in your figure, especially because you are constantly exceeding the absolute rating, even if it is only for short bursts of time.

    Tim

  • 0 in reply to Tim Reyes
    Guru 21685 points

    Hi Tim-san,

    Thank you for your response. I could understand the definition of absolute maximum ratings.

    Best Regards,

    Sonoki