The AX3901 is a high efficiency synchronous step-down DC/DC converter series with 2A continuous output current supplied.

A built-in Under Voltage Lockout (UVLO) circuit is provided to prevent start-up until the input voltage reaches to 4.5V. In addition, it features over-current protection and thermal shutdown. To improve the light load efficiency, it is designed as the power saving mode (PSM) to minimize the switching loss by reducing the switching frequency.

The AX3901 is available in SOT-23-6L package