I'm currently looking for a replacement for the TPS76030 in our application, and stumbled upon the TPS79030. It looks like a clear upgrade but then I found the catch with the Vin requirements.
In the recommended operating conditions the datasheet states:
To calculate the minimum input voltage for your maximum output current, use the following formula:
VI(min) = VO(max) + VDO (max load)
Which is pretty much what I expected. But in the electrical characteristics table it states that Vin = Vo + 1V.
Now, I'm not an expert in analog circuitry so I have to ask which parameter will probably be affected if the Vin is only 0.5V above Vo?
What I'm basically looking for is a replacement for the TPS76030 with reduced quiescent current (around 20µA would be nice) and preferably lesser noise. The application has typically Vin = 3,5V-6.5V and we need Vo = 3V with Io = 1,1mA - 2,4mA. Ambient temperature can be anywhere from -40 to 125°C. It's used to power a sensor frontend with a 19-bit ADC and a 50Hz sampling rate.
Basically the TPS79030 looks like a perfect fit but I'm unsure because of the Vin = Vo + 1V
