The DNA 250 chip is made by a company called Evolv. Evolv describe the chip on their website:
The DNA 250 is a power regulated digital switch-mode DC-DC converter for personal vaporizers. It features Evolv’s patented Wattage Control, Temperature Protection, Preheat, Digital User Controls, OLED Screen, Onboard Buttons and Synchronous Rectification for maximum battery life and minimal heat generation. The DNA 250 runs from a 2 or 3 cell lithium polymer battery, and features cell-by-cell battery monitoring and integrated balance charger. The USB port and Evolv’s EScribe software can be used to customize or monitor the user experience. It is the most advanced personal vaporizer controller ever made. The DNA 250 is vaping down to a science.