The electronic cigarette is mainly composed of four parts: tobacco oil (including nicotine, essence, solvent propylene glycol, etc.), heating system, power supply and filter tip. It generates aerosol with specific smell through heating and atomization for smokers to use. On the market, e-cigarettes can be divided into two categories: one is the atomized e-cigarettes that burn cigarette oil, and the other is the non combustible tobacco e-cigarettes. And these e-cigarettes are divided into big cigarettes and small cigarettes, with the main difference being the nicotine content and the power of the e-cigarettes. Various types of electronic cigarettes are shown in the following figure:

        Big smoke: Large smoke is commonly found in battery compartments with an output wattage of over 15 watts and an atomizer ohmic value below 1.0. The oil used is an electronic cigarette mode with a normal nicotine content of less than 3 milligrams and a temperature range of 300-500 degrees Celsius.

        Small smoke: Mainly used is nicotine salt and tobacco oil, a type of electronic cigarette with a battery compartment below 15 watts and a nebulizer above 1.0 ohms, with a temperature between 100-300 degrees Celsius.

        The circuit composition and component application of electronic cigarettes are shown in the following figure:

        Among them, ESD, NMOS, LDO and other materials have corresponding products from ISC Microelectronics Co., Ltd. The material model table corresponding to ASIC is shown in the following figure: