Switching Regulator with L4972A

The LA9472A is a 2A monolithic step down switching regulator operating in continuous mode and realized in a new BCD technology allowing the integration of isolated, vertical DMOS power transistors with mixed CMOS/bipolar transistors. The device can deliver 2A at an output voltage adjustable from 5.1V to 40V and contains diagnostic and control functions that make it particularly suitable for microprocessor based systems. More: Integrated functions include a reference voltage of 5.1V at 2%, soft start, under-voltage lockout, an oscillator with feed-forward control, pulse by pulse current limit, thermal shutdown and a reset and power failure circuit.

The LA9472A is designed for applications requiring efficient voltage regulation with a maximum output current of 2A. Its continuous mode operation allows for stable output under varying load conditions, making it ideal for microprocessor and digital circuit applications. The BCD (Bipolar-CMOS-DMOS) technology enhances the integration of power transistors, which improves performance and reliability.

The adjustable output voltage range from 5.1V to 40V provides flexibility for various applications, allowing designers to select a suitable output voltage based on their specific requirements. The integrated reference voltage of 5.1V with a tolerance of 2% ensures precise regulation, which is critical in systems where voltage levels must be maintained within strict limits.

Key features such as soft start functionality prevent inrush current during startup, protecting sensitive components and improving overall system reliability. The under-voltage lockout feature ensures that the regulator does not operate below a certain voltage threshold, preventing erratic behavior or damage to the load.

The oscillator with feed-forward control optimizes the response of the regulator to changes in input voltage and load, enhancing transient performance. The pulse-by-pulse current limit feature protects the circuit from overcurrent conditions, ensuring safe operation under fault conditions.

Thermal shutdown is a crucial safety feature that automatically disables the regulator if it exceeds a predetermined temperature, preventing damage due to overheating. Additionally, the reset and power failure circuit provides essential monitoring of the output voltage, enabling proper system response during power loss events.

Overall, the LA9472A is a robust and versatile switching regulator suitable for a wide range of applications, particularly in environments where efficiency, reliability, and precise voltage control are paramount.The LA9472A is a 2A monolithic step down switching regulator operating in continuous mode and realized in a new BCD technology allowing the integration of isolated, vertical DMOS power transistors with mixed CMOS/bipolar transistors. The device can deliver 2A at an output voltage adjustable from 5.1V to 40V and contains diagnostic and control functions that make it particularly suitable for microprocessor based systems.

Integrated functions include a reference voltage of 5.1V at 2%, soft start, under-voltage lockout, an oscillator with feed-forward control, pulse by pulse current current limit, thermal shutdown and a reset and power failure circuit. The latter provides a 🔗 External reference