I am trying to design a split power supply from lithium-ion batteries to use with different portable audio projects.
In order to have a stable power source, since it comes from batteries, it has to be regulated.
These two LDOs can provide 300mA for the positive one and 200mA for the negative, so considering only the highest one I will have a PD of 0.4W
Do I have to calculate 4.2Vin as when the battery is full, even if nominal, and I guess under load, the voltage is 3.7V?
The junction temperature is 187.1°C/W
The increase of temperature is 74°C
Would I have problems considering that according to the datasheet the operating junction temperature is 125°C?
I have also read somewhere on that sheet that it should not be placed close to other chip etc., but how can that be accomplished on a small PCB while also considering that there is another LDO that needs to be placed?
Do you think I should change something or not?