LP3981IMMX-2.7

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LP3981IMMX-2.7

The LP3981IMMX-2.7 is a linear voltage regulator that offers a variety of application fields and working principles. It is used as a primary regulator for powering low-cost and portable devices, as well as for high-current applications. The LP3981IMMX-2.7 is also used for input voltage sequencing, as well as for voltage level shifting and voltage conversion.

Application Fields:

The LP3981IMMX-2.7 is excellent for the following applications.

• Primary regulator in lightweight, low-cost and portable electronic devices, such as PCs, laptops, mobile phones, PDAs, tablets, and digital cameras.
• Input voltage sequencing, as well as level shifting and voltage conversion.
• High current applications, as the LP3981IMMX-2.7 can provide up to 10 A.

The LP3981IMMX-2.7 can be used both as a constant voltage regulator, or as a voltage regulator with adjustable output voltage. The output voltage can be adjusted by adding resistors in the device’s reference and feedback pins.

Working Principle:

The LP3981IMMX-2.7 has operating and quiescent currents of 200µA and 19µA, respectively. It is designed to be stable in both step-down and step-up mode. This linear voltage regulator also has an internally fixed frequency oscillator, with additional features such as thermal shutdown, overcurrent protection and overvoltage protection.

The LP3981IMMX-2.7 operates by comparing the output voltage with an internally-generated reference voltage. The difference between those two voltages is then amplified by an error amplifier. The output voltage is then adjusted by the current mirror circuit of the regulator. This process is compared to the regulating effect of the voltage range, until the output voltage is equal to the internally-generated reference voltage.

Conclusion:

The LP3981IMMX-2.7 is a highly versatile voltage regulator, suitable for use in a wide range of applications. It is capable of regulating both step-up and step-down voltages, and it has a variety of protection features. It also features an integrated oscillator, current mirror circuit and error amplifier. As such, it is an ideal choice for powering lightweight, low-cost and portable devices.

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