Tool/software:
We have 6V output from TPS65320D on the board. If TLV1117LV can use the 6V as Vin and supply 3.3V output, then we can avoid using another IC. The datasheet states Vin as 2 to 5.5V but also says Vin max is 6V. If we use 6V as Vin, can it work reliability in the application?
Hi Wei,
We would not recommend operating with a 6V nominal input voltage, if the input voltage never exceeded 6V you MAY be ok. However, if there are any deviations coming from the upstream switching regulator that would put you at significant risk of damaging the LDO. Also any load transient, current limit events, thermal shutdown events, etc.. which causes quick changes to the load current will likely result in an input voltage transient as well. So when the load goes from high to low, the input voltage may have a transient that goes higher than 6V and risk damaging the LDO.
I would recommend TLV761 for this application, it is footprint compatible with your current TLV1117LV, can support the same output capacitor usage while increasing the recommended operating volage to 16V in order to safely operate during the transient conditions I mentioned above.
Below is a quick spec comparison of the two parts.
