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Any idea what its purpose is? Maybe a picture of the entire PCB would help with a description of what product it is?
Is it near a power source? Near a microcontroller? Maybe a transceiver for comms? What I am trying to say is put the IC in context.
looking at IC's map (shown above) I see electrolytic capacitor which signed as a "1,23 V reference".
-probably somebody knows how it works? Do they really have electrolytic capacitor inside?
-Then one thought comes in my mind...
-probably, they should have quite restricted frist of application . So I suspicion they begin to die of their capaсitors after 7-10 years of running.
expanding on that.... just as it doesn't have an electrolytic capcitor inside, it doesn't have a battery either. It is diagramatic of a reference voltage, a stable voltage derived from the input at pin 8.
The "Error Amplifier" compares it with the voltage at pin 7 to control the output voltage. The manufacturer provides a built-in divider available at pin 6 for the convenience of use when 5V is needed but by breaking the connection to pin 7 you can use your own external resistors to set other voltages. If you calculate the voltage at pin 6 from the resistor values you will note it is also ~1.23V.