**Application examples:**
1. **Power amplifier module:** VBA4311 can be used in power switching circuits and power controllers in power amplifier modules. For example, it can be used for power switching and current control in audio amplifiers to improve sound quality and power output.

2. **Power tool drive module:** Due to its small drain current and low on-resistance, VBA4311 is suitable for power switching and current control in power tool drive modules. For example, in an electric drill press or electric hammer, it can be used as a power switch in the motor drive module to achieve efficient driving and work control of the motor.

3. **Medical equipment module:** In the medical equipment module, VBA4311 can be used as a power switch and current control device to realize power management and work control of medical equipment. For example, in medical ultrasound equipment, it can be used as a power switch in the ultrasound transmitting module to control the frequency and power output of ultrasound.