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Team,
Due to shortages we are working on replacing a LP3990 and LP3991 with a LP5900.
In the datasheet we see the following statement about dropout for LP3990:
The LP5900 has a similar statement but with higher recommendation:
The strange thing is the LP5900 specified dropout is better than the LP3990 (80mV vs 120mV)
In a situation where headroom is <1V is there any reason to expect the LP5900 would actually perform worse than the LP3990?
We have our tolerance specified as 2% for the LP5900:
Any idea what kind of tolerance hit the part would take if we were closer to 0.5V for Vin-Vout?
Best,
David
Hi David,
The LP3990 and LP3991 have worse Vout tolerance and also use a Vin=Vout+1V or Vout+2V test case :
Therefore, LP5900 has better performance. If we look at the Vout change plot vs Temp:
Although it is Vin=Vout+1V, we can observe it is way tighter, therefore, at Vin=Vout+0.5, the device should still be within the 2% range.
Best,
Edgar Acosta