The CH32V003 series is an industrial-grade general-purpose microcontroller based on the Qingke RISC-V2A core. It supports a 48MHz system clock frequency and features wide voltage range, single-wire debugging, low power consumption, and an ultra-small package. It provides commonly used peripheral functions, including one DMA controller, one 10-bit analog-to-digital converter (ADC), one operational amplifier comparator, multiple timers, and standard communication interfaces such as USART, I2C, and SPI. The product has a rated operating voltage of 3.3V or 5V and an operating temperature range of -40℃ to 85℃ (industrial grade).

The SD4947 is a DC-DC converter control chip for buck switching power supplies, driving external MOSFETs. The SD4947 features integrated high-voltage supply for fast startup, adaptive frequency reduction to further optimize conversion efficiency under light load conditions, and built-in frequency dithering to optimize EMI. The SD4947 also integrates various abnormal state protection functions, including: cycle-by-cycle peak current protection, VDD overvoltage protection, undervoltage protection, output overload protection, output overvoltage protection, and overtemperature protection.

The M3406 is a constant frequency, current mode step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low as 0.6V. The M3406 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load. The M3406 is offered in a low profile 5-pin, SOT package, and is available in an adjustable version.