Your adapter can probably provide 3A as stated, it is just that the phone doesn’t draw as much as you want. The reason is that phones use various charging protocols to discover the max current of the charger. By default the current an USB charger provides is 500mA. The LT1173 consumes just 110µA supply current at standby, making it ideal for applications where low quiescent current is important. The device can deliver 5V at 80mA from a 3V input in step-up mode or 5V at 200mA from a 12V input in step-down mode. Most of my Arduino type boards are 5V although many do have 3.3V available. Nevertheless, with this converter it is easy to wire up 3.3V devices to 5V. These have one more use for us, We originally tried to drive some high power MOSFETs with poor response, but after adding pull up resistors to the gates, and IO static with a pull down resistor set internally on the pin, we get very reliable control. In fact bandwidth of transmitted PWMs has almost tripled. This MOSFET controls large 12vdc coils for a hydraulic valve. Control response went from 97% - 99.9% range to 74% - 99.9%, giving tremendous improvement.

A wide range of IC’s and automation controller devices require 5 V DC supply for their operation, in the absence of 5 volt supply we might be needed to derive it from the existing power supply then comes these linear converter for help. Here’s the list of all possible circuits but their application differs from circuit to circuit. We already discussed 9v to 5v converter circuit previously. The project i am working includes connecting the various sensor and control signals between a 5 volt - does not work with the other digital level shifter, to a pi pico.The PlusRoc converter is also available with a USB-C connector or a standard USB-A, making sure all the options are covered. This converter has been tested to ensure a higher than 90% efficiency rating. This logic level won’t work for anything lower than 1.8V. It won’t fully turn the MOSFET ON or OFF below that voltage level. We tried using it with 1V but the 5V logic side wouldn’t fully turn off.

I use this board with the TTL serial coming out of a Parrot ARDrone at 1.8V and have had no issues, switching at 115200 baud.The above circuit diagram shows the circuit along with all the calculated values for our required operation. Working of 12V to 5V Circuit Higher switching frequency will mean less ripple on the output (more accurate voltage/current) but causes more overhead due to switching, which reduces the efficiency a bit.