S-812C40AMC-C2UT2G

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Linear voltage regulators are one of the most popular and widely used forms of power management integrated circuit (PMIC). The STMicroelectronics S-812C40AMC-C2UT2G is one of the many great ones available that can provide voltage regulation for a wide range of applications. This article will discuss the S-812C40AMC-C2UT2G’s application fields, as well as its working principle.

Applications

The S-812C40AMC-C2UT2G is primarily used for generating a fixed output voltage for a variety of applications, with power ranges from 2.6V to 5.5V and a capacity of up to 400mA. The primary use of this highly efficient device is to power digital logic circuits such as microprocessors, memory devices, and LED displays in consumer electronics. It is also used in industrial, automotive, and medical systems such as motor drives, LED lighting, and implantable devices. This regulator is also capable of supplying up to 4 discrete outputs.

Backed by STMicroelectronics’ robust design, the S-812C40AMC-C2UT2G is subject to a wide range of environmental tests and material selection, making it reliable to use in high stress, vibration and temperature applications. It also has a Wide VIN Range of 10V, enabling the use in wide input voltage applications.

Working Principle

The S-812C40AMC-C2UT2G is an LDO (Low Drop-Out) voltage regulator. This type of device uses a type of pass transistor to maintain the output voltage with a minimum amount of power dissipation. The S-812C40AMC-C2UT2G utilizes the main pass transistor and a feedback voltage divider network to maintain the output voltage.

The pass transistor consists of a power MOSFET that can be seen in the back of the device, which is controlled by the voltage at the internal junction between the ground pin and the pass transistor. This junction is connected to the feedback pin, which supplies a stable reference voltage to the pass transistor and allows for controlling the voltage across the device.

The voltage divider network is connected to the feedback pin, and it helps to determine the output voltage of the device. The divider network consists of an input resistance and an output resistance, which are connected in series. When the voltage at the output pin is greater than the feedback pin, the device reduces the output voltage, and vice versa.

The S-812C40AMC-C2UT2G also includes thermal protection and short-circuit protection, as well as over-voltage protection. The short-circuit protection will protect the device if a short circuit is detected. The over-voltage protection feature will kick in if the output voltage is greater than the set voltage, and will attempt to bring it back within the set voltage range.

Conclusion

The S-812C40AMC-C2UT2G is one of the many great linear voltage regulators available for a variety of applications. Its power range, capacity, and wide input voltage range make it ideal for digital logic circuits, automotive systems, and medical devices. Its internal pass transistor and feedback voltage divider network are what allow it to maintain a stable output voltage. The additional protections featured in the device make it a reliable option for many applications.

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