L4940P85

The L4940P85 is a frequency independent linear voltage regulator designed to provide a steady output voltage with a load capacity of up to 3 A. Operating from an input voltage of up to 25 V and utilizing an ultra-low-dropout voltage of 50 mV at 3 A, it provides non-stop power supply for low power applications. The device incorporates an efficient, active current-limiting circuit with a thermal shut-down feature to protect the power device from damage due to an overload or short circuit.

The device employs two independent voltage-regulating sections. Its design utilizes a dual-N-type thermally-matched FET which allows it to adjust its stable output voltage dynamically. This allows the regulator to provide clean, regulated output power over a wide range of input and load conditions, providing superior performance compared to other linear regulators.

The L4940P85 is designed to operate in a wide temperature range of -40°C to +105°C, making it suitable for a variety of applications. For example, it can be used directly in applications such as stabilizing battery voltage and providing a galvanically isolated input/output voltage on critical circuits. It can also be used in numerous other applications such as providing microcontroller power supplies, low noise, constant current low voltage power supplies, medical isolation, automotive and industrial control.

The device works by monitoring the input voltage during normal operation, and comparing it to a precision reference voltage. It then ramp-adjusts the output voltage by varying the impedance of the two N-FET\'s, thus accurately controlling the output voltage. The two N-FETs also provide a short-circuit current-limiting protection feature. This means that the device can protect itself and the load by limiting excessive current in the case of a short circuit.

Because the device automatically adjusts its output voltage to match the input voltage, it allows the user to design a power supply that is simpler and more cost-effective than an equivalent switching regulator design. Additionally, since the regulator consumes only a small amount of power and produces very little heat, it can be used in small, low-power applications without fear of overheating or damaging components.

The L4940P85 is an ideal solution for a wide range of applications which require low voltage and low power consumption. Whether you need to provide a steady output voltage to microcontrollers, provide galvanically isolated input/output power supplies, or provide low noise, constant current power supplies, the L4940P85 is a great choice.