Could someone suggest a voltage follower with thermal protection (thermal shutdown)?
I see possible solutions:
- An LDO with external reference. I found only few of them, seems they are called tracking LDO and they are very rare and are hard to buy. Maybe I did a wrong search?
- Use a transistor with thermal shutdown. I found only one transistor in the entire internet and it's seem obsolete. Does such transistors exist?
- High current op-amp with thermal shutdown. I found only big expensive specialized devices of this type. Are there small, like SOT-23-6, and cheap op-amps of this type?
- Maybe it's possible to create a voltage follower using an op-amp and a regular adjustable LDO? How?
- Something else?
Please share your ideas. Thank you.
Just if you want a specific details: I need a voltage follower buffering 1.2-3.3V signal and powered from 5V supply. I want it to be able to provide up to 200mA of current at least for short period of time, typical consumption is about 30-50mA. Since my device is small and fitted in 10 x 8 x 3cm plastic box, I think, there is a possibility that under long lasting worst condition (200mA at 1.2V (i.e. 3.8V dropout)) the transistor of classic voltage follower could overheat. That is why I would like to have a solution with thermal shutdown.