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LP2980IM5-3.3 Application Field and Working Principle

LP2980IM5-3.3 is a low-dropout, low-noise, fixed output voltage, three-terminal linear regulator manufactured by Texas Instruments. This device helps to cut wasted energy, nuisance product recalls, and reduce repair costs by maintaining a constant voltage when the input voltage drops or fluctuates. The LP2980IM5-3.3 offers guaranteed output noise as low as 7.5µVrms and a wide range of adjustable and fixed output voltage range.

Application Field

The LP2980IM5-3.3 is suitable for a broad range of applications, including low-noise power supplies for digital and audio systems, post regulation for switching converters, automotive applications and battery-powered systems. It features current limiting, thermal overload protection and is available in TO-220, D2PAK and SOT-223 packages.

Working Principle

The LP2980IM5-3.3 operates by monitoring the output voltage and comparing it to a reference voltage. When the output voltage drops below the set level, the LP2980IM5-3.3 will quickly increase its internal power output. This is done by sensing the error between the output and reference voltage, amplifying it and then drive the internal power transistor.

The internal power transistor increases its output current until the output voltage reaches the set value. An overload protection circuit is included to limit the current and protect both the regulator and the circuit when the output current increases more than the set value.

The LP2980IM5-3.3 includes an enable pin (EN) and a bypass pin (BYP) that help increase its functionalities when interfacing with other components. The enable pin (EN) can be used to provide output voltage disabling or enable when pulled low (GND) or high (Vin), respectively. The bypass pin (BYP) allows the device to either connect with an external bypass capacitor or directly access the regulated output without the need for an external capacitor.

Summary

The LP2980IM5-3.3 from Texas Instruments is a versatile and compact voltage regulator that is suitable for a broad range of applications. It features current limiting and thermal overload protection, and is available in three packages. The LP2980IM5-3.3 operations are based on monitoring the output voltage and compare it to a set reference voltage, whilst the enable and bypass pins provide further control when connecting with other external components.

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