Hi!
I need 15 Volts for my project - my Arduino nano wants 5V. Yes I can use a voltage regulator, but USB PD first gives 5 Volts, then after a certain time, it gives me my 15 Volts. So are there maybe voltage regulators which can input 5 Volts and output also 5 Volts (or 4,8 - so the nano starts)?
Or how would you approach such a problem?
Look into boost/buck converters.
but arent buck-boost converters very bulky solutions? Isn't there a way to use a 5V regulator, which doesn't drop much on 5V input? (for example 5V input and 4,8V output, but when using higher voltage like 15 Volts, the output stays at 5V)
There are low-drop-out (LDO) regulators, which may drop as little as ~0.2V, but they have limited input voltage range. Those that have higher input voltage range seem to have higher drop-out voltage.
For example, MCP1700-5 has a drop-out voltage of 178mV, but the maximum input voltage is 6.0V.
AMS1117-5 has a maximum input voltage of 30V but the drop-out is 1.15V.
The other problem you have with any linear regulator is power dissipation. With a 15V input and 5V output, 66% of the power consumed by your circuit will be dissipated as heat by the regulator.
A boost/buck regulator is more efficient (except at very low currents), and perhaps only 10~30% of the power being dissipated by the converter.
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