NodeMCU v3 - What is the maximum supply voltage via microUSB?

Question

All I have left are phone chargers with higher voltages. One max 9V, the other max 12V. Question as in the topic, what is the highest voltage I can supply to this module via the microUSB socket?
When I previously powered the ESP-07 module from the 1117 3.3V stabiliser with a 12V power supply, the stabiliser steamed.
In the this module supposedly max 9V can be, but I have a different module, LoLin, and I did not find this information for such.

dufek · Answer

There are several ways to supply power to the module: Supply 5-18 V through Vin; 5V via USB or VUSB pin; 3.3V via 3V pin.

sq9etc · Answer

Can you provide a link to the source of this information?

JoteR · Answer

Not surprisingly, Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2 W for SOT-223 [...] and that the ESP can pull and 200 mA, so there could be over 1.5 W of loss there. This is why a two-stage regulation is usually used - first the voltage is brought down to 5 V and only this voltage is applied to the 1117-3.3 input. . A 3.3V voltage regulator is placed on the board with all the implications of this. And as for the title question - there is a CH340 chip on the micro USB input. What's the highest voltage you can feed it, check yourself e.g. here: Link to the datasheet there.

dufek · Answer

. After that kind of time it's a closed tab for me. A colleague can search for it himself. With stabilisers, in addition to the allowable voltage, the loss power is important. The circuit can be supplied with up to 18V, but the loss power on the stabiliser can cause damage. It all depends on the application.

khoam · Answer

. The information is available at: Link .

sq9etc · Answer

Thank you all for your replies. In my first post I wrote that the other module can be powered by up to 9V. This is the case, but not via the micro USB socket.
It is not going crazy in my module. The CH340 converter used cannot be powered with such high voltages.
This leaves me to look for another charger. Unless, of course, the charger I have works with 5V by default, and makes higher voltages, i.e. 7V and 9V available only to phones that can force it on it. But that's a question for another section.

kaczakat · Answer

If you're thinking of some 'quick charge' phone chargers then you can safely connect them to the NodeMCU. They have a maximum of 9 or 12 or 18V, but they only give a voltage higher than 5V if they establish communication with the device being charged and it asks for a higher voltage.

sq9etc · Answer

This is the charger from the Doogie T6 Pro phone. It has fast charging, but it's unlikely to be anything standard. The voltages on the charger are 5/7/9V.

kaczakat · Answer

In such dilemmas it helps to have a simple USB DOCTOR tester/meter: . There are probably different types, so it's worth reading in the description what the allowable input voltage is.

krzbor · Answer

USB chargers always give 5V. Only after proper negotiation or setting of the signal pins do they raise the voltage. I have not heard of a USB charger with D+ and D- unconnected giving a voltage other than 5V (I am leaving out some car chargers where there is only a resistor).

NodeMCU v3 - What is the maximum supply voltage via microUSB?

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