The present IP is a voltage regulator to generate 2.5v power for on chip circuits. Normally, its power supply is 4.5v~5.5v. The generated power voltage is 2.5v (2.25v ~ 2.75v).

Yes, you’ll still need to use a regulator if the rest of your project is running at 5V, but if the pins are 5V tolerant, interfacing the ESP8266 with a variety of hardware becomes very easy.

Based on SMIC 0.18μm 3.3v/1.8v Logic process, this design of Low-Dropout (LDO) regulator is to provide both 3.3V and 1.8V supplies that are regulated from the single 5V input. The maximum output ...