STMicroelectronics Voltage Regulators - Linear L4947PD

The L4947PD is a linear voltage regulator designed for automotive and industrial applications, providing a fixed output voltage of 5V with a maximum output current of 500mA. It features a very low dropout voltage of up to 0.75V, allowing it to operate effectively even during battery cranking phases when input voltage may drop to 6V. The device includes a reset function that is particularly useful for microprocessor-based systems, providing a reset signal after a programmable delay defined by an external capacitor. Protection features include load dump protection up to 80V, reverse voltage protection, short circuit protection, and thermal shutdown with hysteresis. The L4947PD operates over a wide temperature range from -40°C to 125°C, making it suitable for harsh environments. The quiescent current is low, ensuring efficient operation. This product is packaged in a PowerSO-20 format, facilitating integration into various electronic systems.