I have some doubts about how to select a voltage regulator. I am planning to use a Texas Instruments TPS7A05 LDO regulator to regulate my 5V (250 mA) to 3.3V (200mA) to power my STM32 microcontroller. I am using a battery as source.
My input to LDO regulator:
- input voltage :5v
- input current : 250 mA
- output voltage : 3.3v
output current : 200 mA ( to power my STM32 microcontroller)
Dropout voltage :
I understood that dropout voltage is the difference between input and output voltage . The difference between my input voltage and my expected output voltage is 5V-3.3V =1.75V, but in the datasheet it is given like
So I am getting my voltage drop of 1750 mV. It is more than 230 mV so to get 200 mA of output current my voltage drop should be 230 mV or what then why they have given the maximum input voltage as 5V and maximum current as 200 mA. So based on my doubt I cannot use this regulator or ehat or my understanding is wrong and we can use it.
Ground Current : I understood that ground current is the difference between input current and output current. So the difference between my input current and my expected output current is 250 mA - 200 mA = 50 mA but in the data sheet it is given like:
It is given like as 6 micro amperes, but based on my input and output current difference is 50 mA it is lot more than the given.So can I use this regulator based on my input and output or not or can I use a resistor connected in series so that I am able to get the ground current as given in the data sheet.
If my understanding is wrong please correct me.
Can I use this regulator for my application or not?
Please find the attached link of Texas instruments TPS7A05 LDO regulator.