L4931CDT120

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The L4931CDT120 is a low dropout linear voltage regulator designed and provided by ST Microelectronics. It is a three-terminal device, with the output voltage adjustable by the external feedback resistors, and offers a maximum of 1.2A output current. The device is made using ST\'s proprietary multi-topology process

Application Field

The L4931CDT120 is used in a wide range of applications, from industrial to automotive, from telecommunications to consumer electronics. It is used whenever low voltage and current needs to be stabilized or regulated. It is especially suitable for portable applications, thanks to the low quiescent current and an extremely low dropout voltage.

Its wide operating temperature range and the flexibility of the output voltage make it suitable for use in industrial and automotive applications as well as in telecoms and consumer electronics.

The L4931CDT120 is designed to be used in microprocessor, digital signal processor and microcontroller systems, where accuracy and low noise are needed in the power supply. It is also suitable for use in battery-powered applications, thanks to its low quiescent current.

Working Principle

The L4931CDT120 is a three-terminal linear voltage regulator. The output voltage is adjustable by the external feedback resistors, and the output current is limited by a foldback current limit circuit. The device also features low dropout voltage, as well as guard-banding and tracking error compensation.

The L4931CDT120 Regulator works by providing a reference voltage, which is adjustable by an external feedback network. The output voltage is directly proportional to the reference voltage. The adjust pin of the device is used to control the reference voltage, and the feedback resistors are used to adjust the output voltage. The internal PNP pass transistor is used to provide the output current. The quiescent current is kept low to extend the battery lifetime.

The L4931CDT120 also features guard-banding, which means that the output voltage is kept below the maximum rated voltage even if large capacitive loads are connected to the output. This ensures reliable operation even under extreme conditions. The device also includes a tracking error compensation circuit which improves the stability of the output voltage, even when subjected to large output load changes.

Conclusion

The L4931CDT120 is an excellent low dropout linear voltage regulator by ST Microelectronics that can be used in a variety of applications, from automotive to telecommunications. It features low dropout voltage, adjustable output voltage through external feedback resistors, and guard-banding and tracking error compensation. The L4931CDT120 is perfect for portable applications, as it has a low quiescent current, but it can also be used in industrial and automotive applications due to its wide temperature range and adjustable output voltage.

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