The DNA 20D chip is made by a company called Evolv. Evolv describe the chip on their website:
The DNA system lets anyone build Evolv’s patented power regulated technology into their own products. The DNA 20D is a power regulated digital switch-mode DC-DC converter for personal vaporizers. It offers controlled power from 7 to 20 watts, runs from a single lithium cell and includes protective features such as overcurrent, over and undervoltage protection and a thermal shutdown. It features a small OLED display, analog or digital user controls, onboard buttons and synchronous rectification for maximum battery life and minimal heat generation.