LP3879MRX-1.2

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The LP3878MRX-1.2 is a high-performance precision, low-dropout linear voltage regulator. It provides a regulated output voltage from an input voltage as low as 1.25V. The device has been designed to have a fast transient response so that it can provide steady output even when the input voltage varies rapidly. It is especially suitable for low-voltage applications including portable electronics, power systems, networking, and other applications that require a stable power supply.

The LP3878MRX-1.2 is a low-dropout linear regulator featuring a very low dropout voltage of 0.8 V at 500 mA. It is capable of delivering up to 500 mA of continuous output current. The device also features a wide input voltage range of 1.25 V to 16 V and low quiescent current of 20 μA. This makes it an excellent choice for powering low-power devices with limited current demands.

The LP3878MRX-1.2 can operate in either fixed or adjustable output voltage modes. In fixed-mode operation, the output voltage is set using external resistive dividers. In adjustable-mode operation, the output voltage can be adjusted using an external reference voltage connected to the REF pin. The device also features an over-temperature and over-current protection circuit. If a current higher than the device\'s rating of 500 mA is drawn, an internal thermal shutdown circuit will shut down the device until the current is reduced.

The LP3878MRX-1.2 is designed to be low power and efficient, featuring a low quiescent current and a high efficiency of up to 95%. It has an output voltage range of 0.8V to 6V and can be used in a wide variety of applications, including CPU core and I/O voltage regulation, audio/video equipment, and medical systems. In addition, it can be used for battery-powered systems, such as portable electronics, automotive, computer peripherals, telecommunications equipment, and consumer electronics.

The LP3878MRX-1.2 has a typical operating temperature range of -40°C to +125°C, making it suitable for harsh environments. It is available in surface mount SOT23-5, SOT23-6, and SOT23-8 packages, providing design flexibility and saving board space. It is also compliant with RoHS and HALogen-free requirements.

The working principle of the LP3878MRX-1.2 is relatively simple. It uses an internal NPN transistor to regulate the output voltage. The transistor has a base voltage controlled by a bandgap reference. This reference voltage is compared to the input voltage through a resistor divider and then standardized with the output voltage. The input voltage is regulated by controlling the biasing current in the PNP transistor. When the voltage is too high, the biasing current is increased and the output voltage is decreased. When the voltage is too low, the biasing current is decreased and the output voltage is increased.

In summary, the LP3878MRX-1.2 is an excellent solution for low-power applications using a regulated output voltage from a low input voltage. It features a low quiescent current, fast transient response, over-temperature and over-current protection, and adjustable output voltage capability. It is also RoHS and HALogen-free compliant and available in a choice of surface mount packages. With its range of features and excellent performance, the LP3878MRX-1.2 is an ideal solution for powering a wide range of consumer electronic products.

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