L4940D2T85

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The L4940D2T85 is a highly integrated step-down regulator with a low dropout voltage, a series of current monitor, output voltage monitoring, and protections functions. It is widely used in embedded systems, consumer and industrial applications such as smartphones, cameras, game consoles, computers and embedded control systems. In general, the operating temperature range is from -40 °C to 125 °C.

The L4940D2T85 belongs to the PMIC - Voltage Regulators - Linear category. It is an advanced synchronous step-down DC/DC converter with adjustable and fixed voltage output options. With a maximum output current of 85A, it is suitable for applications requiring high output current, such as server and telecom power supplies. Thanks to its low dropout voltage, the L4940D2T85 delivers low-voltage output down to 0.8V with a total of 1% maximum output voltage accuracy. Its Low ESR ceramic output caps help increase its thermal performance, ensuring wide operating temperature range and long product life.

The L4940D2T85 has a very simple working principle. When the output voltage is less than the input voltage, the device supplies the current from the external power supply to the load. The voltage across the device is called the dropout voltage which is usually very low in linear regulators due to their high power efficiency.

The device uses a feedback control system to regulate the output voltage. The voltage is first compared to a reference voltage and then a sense amplifier is used to compare the sensed output voltage to the reference voltage. An error signal is detected which is then used to adjust the output voltage. The main components of the L4940D2T85 are a voltage reference, a current limit circuit, an oscillator, a power switch and an output voltage adjustment circuit.

The L4940D2T85 provides protection functions for over-current, over-voltage, and under-voltage. The device is also equipped with SPM® (Smart Power Management) technology from STMicroelectronics, which provides a simple and easy way to control and monitor the power. The device is designed to be highly reliable and offers an output current of up to 85A, suitable for a wide range of applications.

In conclusion, the L4940D2T85 is a high performance, highly integrated step-down regulator with a low dropout voltage and a wide range of protection functions. It is suitable for a variety of consumer and industrial applications such as smartphones, game consoles and embedded control systems. It offers a wide operating temperature range and long product life with its thermal features.

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