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TPS62111-EP SW node abs max limit

Edward Silagi
Prodigy 10 points
Other Parts Discussed in Thread: TPS62111-EP

I'd like some help interpreting Absolute Maximum Ratings data sheet for the TPS62111-EP.  Specifically, the maximum value for "Voltage at SW" is stated as "VI".  Does this imply an absolute number (such as +17 VDC) or a relative number (relative to another pin on the IC) depending on Vcc or some other voltage?  Also, is there a time aspect of this max?  If the exposure is on the order of 1 volt above limit for ~20 nS, could this cause a part failure?  I am investigating a failure, and am interested in possible causes.  Thank you.

  • 0
    TI__Guru**** 150610 points

    You might post in the high-rel forum for the -EP version but for the catalog version, the upper range of the abs max for the SW pin is simply due to the body diode of the high side FET.  Applying a voltage at SW greater than 0.3V above the voltage at the VIN pin could cause unlimited currents to flow through the body diode, breaking the device.

    The abs max table contains DC values.  There is usually little data on AC values for the voltages that can be applied to the pins.  To be safe, just stay below the DC limits and you're fine.

    Typically, failures are due to poor board layout or hot-plugging the input source.  Both of these cause overvoltages on VIN, beyond the limits in the abs max table.  Your local FAE can help you debug these.