Load switches are primarily used to turn power paths on and off. They are commonly applied at the power input of electronic devices or in power connections between devices. For example, when a monitor connects to a laptop via a USB Type-C® port to transmit signals and simultaneously supply power, a load switch is required to control the power delivery and disconnection.

Modern load switches often go beyond this basic function by integrating additional features such as electrical protection, safety compliance mechanisms, voltage/current monitoring, and pre-stage output voltage adjustment. These enhancements simplify and accelerate system design. Traditionally, implementing such features would require more PCB space and component costs, and the use of numerous external discrete components often led to time-consuming trial and error for engineers. In short, next-generation load switches not only fulfill their original role but also elevate system specifications and ease of design and debugging.

Hong Kong Derun Microelectronics has developed several multifunctional integrated load switch chips based on these principles. The DR1202 is a multifunctional integrated load switch controller that incorporates five independently configurable overcurrent protection circuits, each with adjustable current thresholds and response times. This helps systems achieve fast and effective overload protection while avoiding false triggers caused by noise.

For control, the DR1202 supports both hardware configuration and I²C communication, offering greater application flexibility. Additionally, its VADJ function allows system engineers to use more cost-effective power converters to achieve programmable voltage adjustment.

The DR1212 integrates the external switch directly into the chip, further reducing PCB footprint. Its internal back-to-back N-channel MOSFETs support a rated voltage and current of 22V/5A, making it suitable for USB Type-C® port applications.