Original question:
HI,
SW pin voltage is within datasheet requirement. But Vin-SW minimum voltage exceeds the SW pin requirement.
These only happen when SW is transitioning from low to high. I would like to know if these over-voltage condition cause damage to the device.
CH4 is VIN-SW tested by differential probe
SW pin wave form
Hi Ryan,
VIN-SW posive voltage exceed high-side MOS Vds(drain-source voltage) can damage the device.What I want to figure out is whether the negative voltage (-5.4V in first waveform) can cause damage to the device ?
The first waveform measured with differential probe,and the second waveform measured with single-ended probe as below picture shows.The noise may be a little bit smaller if using differential probe test SW pin.
Hi Lisa,
Yes, the -5.4 V can damage the device. It may be because it is an older device, but the newer devices have a VIN - SW absolute maximum rating listed and usually do not want to exceed the -4V minimum rating.
Best,
Ryan
