Ruth's sister XY-SJVA-4X 0.5-30V 4A LCD boost buck module internal power cable

Purpose & Audience

This is a DC boost-buck module with an integrated LCD that shows input voltage, output voltage, output current and output power. It accepts an input range that allows the output to be set anywhere from 0.5 V to 30 V with a current limit adjustable up to 4 A, making it suitable for hobbyists building adjustable bench supplies or lithium charging circuits.

Fit & Alternatives

The module suits builders who need a single compact board that can both step up and step down voltage while providing constant-current and constant-voltage regulation with reverse-input protection. It is not for buyers who require a higher current limit than 4 A, need an isolated topology, or want a fully enclosed power supply with mains input and safety certifications.

Extras & Impact

The on-board LCD removes the need for external meters during setup and monitoring. Reverse-connection protection at the input prevents damage from wiring mistakes, while output anti-backflow eliminates the need for an external blocking diode when charging batteries. A push-button toggles the output state and the default power-on behaviour can be configured, simplifying integration into automated test rigs.