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PMIC - Voltage Regulators - Linear

The LP2981AIM5-3.2/NOPB application field and working principle is an integrated low-dropout (LDO) voltage regulator with precision output voltage accuracy, designed to provide optimal power conversion in a wide variety of applications. The application field and working principle of the LP2981AIM5-3.2/NOPB is suitable for numerous applications ranging from audio amplifiers, wireless communications, and digital cameras to multi-commodity products and automotive applications.

It has a wide input voltage range of 4.5V to 38V, making it an ideal choice for voltage rail regulation. Its high PSRR performance provides improved regulation accuracy and ripple rejection in noisy environments. Its adjustable output voltage range of 0.9V to 5.5V provides a wide range of regulated outputs for microprocessors and other systems, with accuracy within a +/- 2% tolerance.

Overview

The LP2981AIM5-3.2/NOPB is an integrated low-dropout sense voltage regulator with precision output voltage accuracy. This device has a wide input voltage range of 4.5V to 38V and adjustable output voltage range of 0.9V to 5.5V with a fixed output voltage accuracy of +/- 2%. It has an ultra-high PSRR performance of 66dB, providing improved regulation accuracy in noisy environments.

This device is designed with a low quiescent current (IQ) productivity of only 6.2mA, reducing power consumption and offering maximum power efficiency. Furthermore, the LP2981AIM5-3.2/NOPB has excellent Load Transient Response, allowing it to quickly supply power to load changes. The maximum output current of this device is up to 900mA and is programmable via a resistor dividers.

Features

• Input voltage range: 4.5V to 38V
• Output voltage range: 0.9V to 5.5V
• Accuracy: +/- 2%
• Output voltage mode: programmable
• PSRR: 66dB
• Quiescent current: 6.2mA
• Load Transient Response: <50μs
• Operating temperature range: -40 to +85℃
• Package Options: 5-pin SOT-23-5,5-pin TSOT-23-5,5-pin SC-78

Working Principle

The heart of an LDO regulator is usually a pair of transistors, which provide controlled amplification to a signal. The LP2981AIM5-3.2/NOPB is no different – it consists of an input transistor and an output transistor. The base of the input transistor is connected to the adjustable output voltage pin. The output of the input transistor is then connected to the base of the output transistor, which has its collector and emitter connected in series with the load. To regulate the output voltage, the gain of the transistors is adjusted by the feedback signal from the output voltage pin. This adjusts the current through the transistors and in turn, adjusts the output voltage.

The LP2981AIM5-3.2/NOPB also includes a temperature protection circuit that is designed to maintain an optimal operating temperature. This circuit will shut down the regulator if the temperature exceeds the specified maximum operating temperature.

Applications

The LP2981AIM5-3.2/NOPB is well suited for a wide variety of applications, including:

• Audio amplifiers
• Wireless communications
• Digital cameras
• Multi-commodity products
• Automotive applications

The wide input voltage range, adjustable output voltage range, and excellent performance make the LP2981AIM5-3.2/NOPB a great choice for voltage rail regulation in these and other applications.

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