L4940V85

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Linear voltage regulators are widely used in applications where a hot-swap, step-down or step-up operation is needed. The L4940V85 is the latest addition to STMicroelectronics’ portfolio of voltage regulators and has been designed to provide linear voltage regulation in a wide range of applications. The device is a versatile low-dropout regulator (LDO) that is designed to operate from input voltages up to 285V, and is capable of providing a constant output voltage with adjustable ±2% accuracy. Thanks to its low quiescent current of only 2mA, operation of the device can be automated and still provide minimal power consumption.

The L4940V85 is suitable for a variety of applications, including hot-swap and step-down or step-up power supply design, or for the protection of sensitive circuits and chip-on-board modules. It provides rail clamping protection, which makes it particularly suitable for automotive applications and power circuits, and provides adjustable current limit protection. The L4940V85 offers an additional auxiliary output, which can be used to generate an adjustable voltage. The device is available in four fixed output voltages, 5.0V, 3.3V, 2.5V and 1.8V.

The working principle of the L4940V85 is similar to that of most other linear voltage regulators. The device consists of a series of transistors and resistors connected in a feedback loop. When a voltage difference is detected between the input and the output, current is supplied to the output in order to bring the output voltage closer to the desired level. To improve efficiency, the device also contains a low-dropout circuit, which reduces the voltage difference between the input and the output, allowing for more efficient power transfer.

It also contains a proportional current limit protection circuit, which monitors the output current and automatically shuts off the device if the current exceeds a predetermined threshold. This is especially useful for power supply design, as it prevents the device from being damaged from over-current. The device also includes a thermal protection circuit, which shuts off the device if the device temperature exceeds its maximum operating temperature.

The L4940V85 is an ideal choice for a variety of applications, thanks to its low drop-out characteristics, adjustable current limit protection and thermal protection features. The device can be used in hot-swap, step-down and step-up applications for automotive or consumer applications. The device also offers adjustable accuracy and is available in a range of fixed output voltages, making it suitable for a wide range of applications.

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