LD2982AM33R

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LD2982AM33R Application Field and Working Principle

Linear voltage regulators are used to regulate the output voltage from a DC power supply to a load. They are used to maintain a stable output voltage regardless of the varying input voltage from the power supply. In the past, most linear voltage regulators were designed using discrete components, but modern designs include integrated solutions, such as LD2982AM33R.

LD2982AM33R Overview

The LD2982AM33R is a low dropout (LDO) linear voltage regulator from STMicroelectronics. It is capable of providing up to 800mA of output current with an output voltage range from 1.5V up to 5.0V. The input voltage range is from 1.8V to 8.0V, making it suitable for a variety of applications, including those that require dual-voltage power supply. The LD2982AM33R is available in the 8-pin SOIC package.

The LD2982AM33R is designed to minimize power losses caused by voltage drops across the regulator. It can operate in a power-down mode to reduce current consumption, and is also immune to reverse battery protection issues. Additionally, the device features a fast turn-on time and has an over-temperature protection circuit to prevent damage if the device overheats.

LD2982AM33R Applications

The LD2982AM33R is used in a wide range of applications, from providing power for microcontrollers and DSPs, to powering USB and IrDA applications. It has a fast transient response time and is suitable for use in communications, industrial and portable applications, making it a great choice for a variety of projects. The device is also well suited for portable applications, since it has a wide operating temperature range and an integrated reverse battery protection circuit.

The LD2982AM33R can also be used in automotive applications, since it meets the requirements of AEC-Q100 grade 2 devices. Additionally, it has a low quiescent current and low dropout voltage, which makes it suitable for applications that require low power consumption while maintaining a high level of reliability.

Working Principle of LD2982AM33R

The LD2982AM33R is a linear voltage regulator, meaning it works by establishing a voltage drop between the input and output terminals. The input voltage is applied to the VIN terminal and passes through the pass element within the device. As current flows through the pass element, a voltage difference is created between the input and output terminals, with the output voltage being lower than the input voltage.

The output voltage is determined by the ratio of the feedback resistor (RF) to the reference resistor (RREF). When the voltage at the output terminal is lower than the voltage at the reference terminal, the error amplifier will increase the drive current through the pass element, causing the output voltage to increase. conversely, when the output voltage is higher than the reference voltage, the error amplifier will decrease the drive current, causing the output voltage to decrease.

The device also contains an internal current limit circuit, which limits the maximum current that can be delivered to the load. If the load draws too much current, the pass element is automatically shut off. This feature prevents the device from being damaged by an over-current condition.

Conclusion

The LD2982AM33R is a low dropout linear voltage regulator from STMicroelectronics. It is designed to provide up to 800mA of output current with a wide range of output voltages and is well suited for a variety of applications including microcontroller and DSP applications, USB and IrDA applications, and automotive applications. It has a low quiescent current and low dropout voltage, making it suitable for applications that require low power consumption, and it has an over-temperature protection circuit and a current limit circuit to protect the device from damage.

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